Low-quality steam sludge dryer for thermal power plants

Abstract

The application discloses a low-quality steam sludge dryer for a thermal power plant, a drying tank is provided with an exhaust passage for exhaust, a filter assembly is arranged in the exhaust passage; a rotating disc rotates on a lifting cover; a stirring liquid pipe is arranged on the rotating disc, an input end and an output end of a water circulation heat exchange assembly are connected with both ends of the hollow stirring liquid pipe to form a circulation loop; a waste heat collecting box is used for collecting waste heat of the thermal power plant and conducting heat to the water circulation heat exchange assembly; the water circulation heat exchange assembly conducts the waste heat from the thermal power plant to the water circulation heat exchange assembly, and then the water circulation heat exchange assembly and the stirring liquid pipe cooperate to rotate and stir the sludge while conveying hot water to the stirring liquid pipe, so that the sludge can be uniformly dried, the use of heat energy is maximized, the drying efficiency of the sludge is improved, and the use of people is facilitated.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of asphalt paving, in particular to a low-quality steam sludge dryer for thermal power plants. BACKGROUND

[0002] Thermal power plant, referred to as thermal power plant, is a plant that uses fuel (such as coal) as fuel to produce electric energy. Its basic production process is: when the fuel is burned, water is heated to generate steam, the chemical energy of the fuel is converted into heat energy, the steam pressure drives the steam turbine to rotate, and the heat energy is converted into mechanical energy, and then the steam turbine drives the generator to rotate, and the mechanical energy is converted into electric energy. The prime mover is usually a steam engine or a gas turbine, and in some smaller power stations, it is also possible to use an internal combustion engine. They are all through the use of high-temperature, high-pressure steam or gas through the turbine to become low-pressure air or condensed water in the process of pressure drop to generate electricity. When the thermal power plant dries and dehydrates the sludge, a special sludge dryer needs to be used, but the existing sludge dryer has low drying efficiency when used, and it is difficult to maximize the use of energy during the drying and dehydration process.

[0003] For example, CN115677170A low-quality steam sludge dryer for thermal power plants uses low-quality steam produced by thermal power plants as a power source, achieving optimal matching of production processes and maximum utilization of resources; water heat drying realizes sludge resource upgrading, solves sludge solid waste treatment and capacity reduction, reduces fuel costs of thermal power plants, and makes thermal power plants more competitive in the electricity market.

[0004] However, the existing heating of sludge is to heat the stirring barrel, which cannot heat the inside of the sludge, and the drying efficiency is low. SUMMARY

[0005] The purpose of the present application is to provide a low-quality steam sludge dryer for thermal power plants to solve the problems raised in the background art.

[0006] To achieve the above purpose, the present application provides the following technical scheme:

[0007] The low-quality steam sludge dryer for thermal power plants comprises:

[0008] A drying tank is provided with an exhaust passage for exhaust;

[0009] A filter assembly is arranged in the exhaust passage;

[0010] A lifting cover is used to cover the top opening of the drying tank;

[0011] A rotating disc is driven to rotate on the lifting cover by a power device;

[0012] A stirring liquid pipe is arranged on the rotating disc and extends into the drying tank, and the stirring liquid pipe rotates to stir the sludge;

[0013] A water circulation heat exchange assembly is installed on the outside of the lifting cover, and the input end and the output end of the water circulation heat exchange assembly are connected with both ends of the internally hollow stirring liquid pipe to form a circulation loop;

[0014] A waste heat collection box is used to collect waste heat of a thermal power plant and conduct heat to the water circulation heat exchange assembly;

[0015] A heating assembly is arranged on the drying tank.

[0016] Preferably, the filter assembly comprises, from inside to outside, a filter screen, activated carbon, filter cotton, a purification filter plate, and a steam collecting cover, the outer end of the steam collecting cover is connected with a conduit, and the filter assembly further comprises an ultraviolet sterilization lamp aligned with the conduit, and the conduit is arranged in multiple turns within the irradiation range of the ultraviolet sterilization lamp.

[0017] Preferably, the filter assembly further comprises a lead screw lifting assembly connected with the lifting cover through a connecting plate, and used to drive the lifting cover to approach or move away from the top opening of the drying tank.

[0018] Preferably, a second limiting rod is fixed on one side of the lifting cover, a connecting block is fixedly connected on one side of the drying tank, and the second limiting rod is in sliding fit with the connecting block.

[0019] Preferably, a stirring wheel is installed at the lower end of the stirring liquid pipe.

[0020] Preferably, a sludge pump is installed on the top of the lifting cover, and the output end of the sludge pump extends to the inside of the drying tank through a sludge pipe penetrating the lifting cover.

[0021] Preferably, a temperature sensor and a plurality of second heat-conducting fins are installed on the outside of the lifting cover, the temperature sensor is used to measure the temperature of the second heat-conducting fins, and one end of the second heat-conducting fins penetrates the lifting cover to the inside of the drying tank.

[0022] Preferably, the water circulation heat exchange assembly comprises a first water tank, a second water tank, a spiral pipe, a first heat-conducting fin, a water pump, and a water pipe, the spiral pipe is arranged inside the second water tank, both ends of the stirring liquid pipe are respectively connected with the first water tank and one end of the spiral pipe, the other end of the spiral pipe is connected with the first water tank through the water pipe, the water pump is installed on the water pipe, and a plurality of first heat-conducting fins extend from the inside of the second water tank to be connected with the waste heat collection box.

[0023] Preferably, the hollow cylinder vertically extends to below the drying tank, a reciprocating screw rod driven to rotate by a third motor is arranged in the hollow cylinder, a sliding block threadedly matched with the reciprocating screw rod is vertically slidably connected in the hollow cylinder, and water absorbing strips are uniformly arranged on the hollow cylinder and extend into the drying tank and the hollow cylinder.

[0024] Preferably, an elastic rubber layer is arranged on the outer wall of the sliding block.

[0025] Compared with the prior art, the present application has the following advantages:

[0026] The water circulation heat exchange assembly conducts the waste heat from the thermal power plant to the water circulation heat exchange assembly, and then cooperates with the stirring liquid pipe to rotate to stir the sludge while conveying hot water to the stirring liquid pipe, so that the sludge can be uniformly dried, the use of heat energy is maximized, the drying efficiency of the sludge is improved, and the use of people is facilitated. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed for the embodiment description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0028] Figure 1 is a front view of the present application;

[0029] Figure 2 is a front view of the internal structure of the present application;

[0030] Figure 3 is an enlarged view of A of the present application.

[0031] Figure 4 is a schematic view of the hollow cylinder, water absorbing strip and other cooperating parts of the present application.

[0032] 1. Drying tank; 3. Heating assembly; 4. Lifting cover; 5. Sludge pump; 6. Sludge pipe; 7. First motor; 8. Rotating disc; 9. Small bevel gear; 10. Large bevel gear; 11. First water tank; 13. Second water tank; 14. Spiral tube; 15. First heat-conducting plate; 16. Waste heat collection box; 17. Water pump; 18. Water pipe; 20. Stirring liquid pipe; 21. Stirring wheel; 22. First fixing block; 23. Second motor; 24. Screw; 25. Thread 26. First limiting rod; 27. Connecting plate; 28. Second fixing block; 29. ​​Connecting block; 30. Second limiting rod; 31. Exhaust duct; 32. Filter screen; 33. Activated carbon; 34. Filter cotton; 35. Purification filter plate; 36. Steam collection hood; 37. Conduit; 38. Ultraviolet germicidal lamp; 39. Temperature sensor; 40. Second heat-conducting plate; 41. Hollow cylinder; 42. Third motor; 43. Reciprocating lead screw; 44. Slider; 45. Water absorption strip. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] Example:

[0035] like Figures 1-4 As shown:

[0036] The drying tank 1 has a hollow interior and an open top. A lifting cover 4 is provided at the top opening of the drying tank 1. A rotating disk 8 is rotatably connected inside the lifting cover 4. The power device includes: a large bevel gear 10 is fixedly connected to the top of the rotating disk 8, a first motor 7 is fixedly connected to the top of the lifting cover 4, and a small bevel gear 9 is fixedly connected to the output end of the first motor 7. The small bevel gear 9 meshes with the large bevel gear 10.

[0037] The top of the rotating disk 8 is fixedly connected to a first water tank 11 and a second water tank 13. The inside of the second water tank 13 is fixedly connected to a spiral tube 14. The upper end of the spiral tube 14 is connected to the first water tank 11 through a water pipe 18. A water pump 17 is installed on the water pipe 18. Multiple first heat-conducting plates 15 are fixedly connected at equal intervals inside the second water tank 13. The second water tank 13 is filled with heat-conducting liquid. A waste heat collection box 16 is fixedly connected to one side of the second water tank 13. One side of the waste heat collection box 16 is connected to the first heat-conducting plates 15. The bottom of the rotating disk 8 is fixedly connected to a stirring liquid pipe 20. The left end of the stirring liquid pipe 20 extends to connect to the lower end of the spiral tube 14 inside the second water tank 13. The right end of the stirring liquid pipe 20 extends to connect to the first water tank 11.

[0038] The waste heat collection tank 16 is communicated with the hot gas passage discharged by the thermal power plant through a gas conveying hose, the hot gas discharged by the thermal power plant passes through the waste heat collection tank 16, the waste heat collection tank 16 conducts heat to the heat-conducting liquid in the second water tank 13 through a plurality of first heat-conducting fins 15, the heat-conducting liquid conducts heat to the spiral pipe 14 after being heated, thereby heating the water in the spiral pipe 14, and the spiral pipe 14 is spirally arranged to have a relatively long length and facilitate absorption of the heat of the heat-conducting liquid.

[0039] The sludge can be stirred by rotating the hot water conveying stirring liquid pipe 20 while conveying hot water, which not only facilitates uniform drying of the sludge, but also maximizes the use of heat energy, thereby improving the drying efficiency of the sludge and providing convenience for people.

[0040] The lifting device comprises a first fixed block 22 fixedly connected to one side of the drying tank 1, a second motor 23 fixedly connected to the bottom of the first fixed block 22, a screw rod 24 fixedly connected to the output end of the second motor 23, a threaded block 25 threadedly connected to the outer side of the screw rod 24, two first limiting rods 26 fixedly connected to the top of the first fixed block 22, the two first limiting rods 26 being slidably connected to the threaded block 25, a connecting plate 27 fixedly connected to one side of the threaded block 25, the connecting plate 27 being fixedly connected to the lifting cover 4, and a heating assembly 3 fixedly connected to the inside of the drying tank 1, which can facilitate position movement of the lifting cover 4, so as to facilitate taking out of the dried sludge.

[0041] The drying tank 1 is fixedly connected with an exhaust passage 31 on one side, the inside of the exhaust passage 31 is fixedly connected with a filter screen 32, activated carbon 33, filter cotton 34, a purification filter plate 35 and a steam collecting cover 36 from inside to outside in sequence, the steam collecting cover 36 is fixedly connected with a conduit 37 on one side, and the inner wall of the exhaust passage 31 and the top and bottom of the conduit 37 are fixedly connected with ultraviolet sterilization lamps 38, which can filter and adsorb odors for multiple times and perform sterilization and purification treatment on the discharged steam, so as to prevent pollution. The conduit 37 is wound for multiple times in a certain space to increase the length and prolong the cooperation time with the ultraviolet sterilization lamps 38.

[0042] The lifting cover 4 is fixedly connected with a second fixed block 28 on one side, the bottom of the second fixed block 28 is fixedly connected with two second limiting rods 30, the drying tank 1 is fixedly connected with a connecting block 29 on one side, and the second limiting rods 30 are slidably connected with the connecting block 29, which can play a guiding and limiting role.

[0043] The lower end of the stirring liquid pipe 20 is coaxially fixedly connected with a stirring wheel 21, which can drive stirring and convey the sludge accumulated below upward.

[0044] The top of the lifting cover 4 is fixedly connected with a sludge pump 5, the output end of the sludge pump 5 is fixedly connected with a sludge pipe 6, and the sludge pipe 6 is fixedly connected with the lifting cover 4, so as to facilitate the extraction of sludge for drying treatment.

[0045] The top of the lifting cover 4 is fixedly connected with a temperature sensor 39, and the bottom of the temperature sensor 39 is fixedly connected with a plurality of second heat-conducting fins 40 in the drying tank 1, so as to facilitate the understanding of the temperature in the drying tank 1.

[0046] The side of the drying tank 1 is fixedly connected with a control panel, and the control panel is electrically connected with the heating assembly 3, the sludge pump 5, the first motor 7, the water pump 17, the second motor 23 and the ultraviolet sterilization lamp 38, so as to facilitate the control of the overall operation of the present application.

[0047] Working principle:

[0048] The use method of the low-quality steam sludge dryer for thermal power plants comprises the following steps:

[0049] S1: when using the present application, the input end of the sludge pump 5 is connected to the pipeline to extract sludge, the control panel is operated to control the operation of the sludge pump 5, the sludge is pumped to the drying tank 1 through the sludge pipe 6, when drying treatment is needed, the heating assembly 3 (which can be an electric heating plate embedded on the outer side wall of the drying tank 1) is controlled to run, and the waste heat collected in the waste heat collection tank 16 is transported to the waste heat collected in the thermal power plant, then the heat-conducting liquid in the second water tank 13 is heated through the first heat-conducting fin 15, and the water pump 17 is controlled to pump the water in the first water tank 11 through the water pipe 18, then the water in the water pipe 18 is transported to the spiral pipe 14, heated by the heat-conducting liquid in the second water tank 13, then transported to the stirring liquid pipe 20 through the left end of the stirring liquid pipe 20, and the stirring liquid pipe 20 can stir and dry the sludge at the same time, and the stirring liquid pipe 20 can drive the stirring wheel 21 to stir, so that the drying is more uniform, finally the hot water in the stirring liquid pipe 20 returns to the first water tank 11 through the right end for reuse, and the first motor 7 is controlled to rotate the small bevel gear 9, the small bevel gear 9 drives the large bevel gear 10, and the rotating disc 8 rotates in the lifting cover 4, so that the stirring liquid pipe 20 rotates and stirs;

[0050] S2: The steam generated during drying is filtered in turn through the filter screen 32, the activated carbon 33, the filter cotton 34 and the purification filter plate 35, and is subjected to odor adsorption and purification, and is finally collected through the steam collecting cover 36, and is then transported into the conduit 37, the operation control panel controls the ultraviolet sterilization lamp 38 to operate, the steam in the conduit 37 can be subjected to sterilization treatment through the ultraviolet sterilization lamp 38, the second heat conduction piece 40 of the temperature sensor 39 can monitor the temperature in the drying tank 1 in real time, and the information monitored by the temperature sensor 39 is fed back to the display screen of the control panel, so that the information can be understood.

[0051] S3: When the dried sludge needs to be taken out, the second motor 23 is controlled to operate to rotate the screw rod 24, the screw rod 24 can drive the threaded block 25 to slide on the first limiting rod 26, at the same time, the threaded block 25 drives the lifting cover 4 to move upward through the connecting plate 27, the lifting cover 4 drives the second fixed block 28 to move when moving, and the second limiting rod 30 at the bottom of the second fixed block 28 slides in the connecting block 29, and then the dried sludge can be taken out.

[0052] As shown in Figure 2 and 4 , the hollow cylinder 41 is vertically fixedly installed in the drying tank 1, the lower end of the hollow cylinder 41 is open and penetrates the coaxial stirring wheel to the lower side of the drying tank 1, the reciprocating screw rod 43 is vertically rotatably connected in the hollow cylinder 41 and is driven by the third motor 42, the sliding block 44 vertically and linearly slides in the drying tank 1, and the sliding block 44 is threadedly connected with the reciprocating screw rod 43, the outer side wall of the sliding block 44 is provided with an elastic rubber layer, the water absorbing strips 45 are uniformly and fixedly arranged on the hollow cylinder 41 and are located in the inside of the drying tank 1, one end of the water absorbing strip 45 extends to the inside of the drying tank 1, and the other end of the water absorbing strip 45 extends to the inside of the hollow cylinder 41.

[0053] The water absorbing strip 45 is made of flexible material and does not contact the stirring wheel 21 and the stirring liquid pipe 20; the water absorbing strip 45 absorbs the water on the sludge and conducts the water to one end located in the inside of the hollow cylinder 41; at the same time, the third motor 42 drives the reciprocating screw rod 43 to slowly rotate, the reciprocating screw rod 43 drives the sliding block 44 to slowly vertically and linearly reciprocate, in this process, the sliding block 44 extrudes the water attached to one end of the water absorbing strip 45 located in the inside of the hollow cylinder 41 through cooperation of the elastic rubber layer and the inner side wall of the hollow cylinder 41, and the water drops out from the lower end opening of the hollow cylinder 41 under the action of gravity; the water channel is arranged between the upper end face and the lower end face of the sliding block 44. The elastic rubber layer has a certain elastic ability and can avoid damage to the water absorbing strip 45. The water absorbing strip 45 is easy to absorb water, and the water always diffuses to the end with less water.

[0054] In the description of the specification, reference to "one embodiment", "an example", "a specific example" or the like means that a particular feature, structure, material or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. The appearances of the phrases "in one embodiment", "an example", "a specific example" or the like in various places in the specification are not necessarily referring to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0055] The preferred embodiments of the application disclosed above are only to help explain the application. The preferred embodiments do not describe all the details of the application and limit the application to the specific embodiments described. Obviously, many modifications and variations can be made in light of the contents of the specification. The specification selects and specifically describes these embodiments in order to better explain the principles and practical application of the application, so that those skilled in the art can well understand and utilize the application. The application is limited only by the claims and their full scope and equivalents.

Claims

1. A low-quality steam sludge dryer for thermal power plants, characterized in that, include: Drying tank (1), the drying tank (1) is provided with an exhaust duct (31) for exhausting gas; A filter assembly is disposed in the exhaust duct (31). A lifting cover (4) is used to cover the top opening of the drying tank (1); A rotating disk (8) is driven by a power device to rotate on the lifting cover (4); A stirring liquid pipe (20) is set on a rotating disk (8) and extends into a drying tank (1). The stirring liquid pipe (20) rotates to stir the sludge. Water circulation heat exchange component, the water circulation heat exchange component is installed on the outside of the lifting cover (4), the input end and output end of the water circulation heat exchange component are connected to the two ends of the internal hollow stirring liquid pipe (20) to form a circulation loop; Waste heat collection box (16), the waste heat collection box (16) is used to collect waste heat from the thermal power plant and transfer the heat to the water circulation heat exchange component; Heating assembly (3), the heating assembly (3) is disposed on the drying tank (1); It also includes a hollow cylinder (41), the lower end of which extends vertically to the bottom of the drying tank (1). A reciprocating screw (43) driven to rotate by a third motor (42) is provided inside the hollow cylinder (41). A slider (44) that is threadedly connected to the reciprocating screw (43) is vertically connected inside the hollow cylinder (41). Water-absorbing strips (45) are evenly provided on the hollow cylinder (41). One end of the water-absorbing strip (45) extends into the interior of the drying tank (1), and the other end of the water-absorbing strip (45) extends into the interior of the hollow cylinder (41). The outer wall of the slider (44) is provided with an elastic rubber layer; The slider (44) squeezes out the water attached to one end of the water-absorbing strip (45) inside the hollow cylinder (41) by cooperating with the elastic rubber layer and the inner wall of the hollow cylinder (41).

2. The low-quality steam sludge dryer for thermal power plants according to claim 1, characterized in that: The filter assembly includes a filter screen (32), activated carbon (33), filter cotton (34), purification filter plate (35) and a steam collection hood (36) arranged sequentially from the inside to the outside. The outer end of the steam collection hood (36) is connected to a conduit (37), and it also includes an ultraviolet germicidal lamp (38) aligned with the conduit (37). The conduit (37) is arranged in multiple circles within the irradiation range of the ultraviolet germicidal lamp (38).

3. The low-quality steam sludge dryer for thermal power plants according to claim 1, characterized in that: It also includes a screw lifting assembly, which is connected to the lifting cover (4) via a connecting plate (27) and is used to drive the lifting cover (4) to approach or move away from the top opening of the drying tank (1).

4. The low-quality steam sludge dryer for thermal power plants according to claim 3, characterized in that: A second limiting rod (30) is fixed on one side of the lifting cover (4), and a connecting block (29) is fixedly connected on one side of the drying tank (1). The second limiting rod (30) and the connecting block (29) slide together.

5. The low-quality steam sludge dryer for thermal power plants according to claim 1, characterized in that: A stirring wheel (21) is installed at the lower end of the stirring liquid tube (20).

6. The low-quality steam sludge dryer for thermal power plants according to claim 1, characterized in that: A sludge pump (5) is installed on the top of the lifting cover (4), and the output end of the sludge pump (5) extends through the lifting cover (4) to the inside of the drying tank (1) via a sludge pipe (6).

7. The low-quality steam sludge dryer for thermal power plants according to claim 1, characterized in that: A temperature sensor (39) and several second heat-conducting plates (40) are installed on the outside of the lifting cover (4). The temperature sensor (39) is used to measure the temperature of the second heat-conducting plates (40). One end of the second heat-conducting plate (40) passes through the lifting cover (4) to the inside of the drying tank (1).

8. The low-quality steam sludge dryer for thermal power plants according to claim 1, characterized in that: The water circulation heat exchange assembly includes a first water tank (11), a second water tank (13), a spiral tube (14), a first heat-conducting plate (15), a water pump (17), and a water pipe (18). The spiral tube (14) is located inside the second water tank (13). The two ends of the stirring liquid pipe (20) are connected to one end of the first water tank (11) and one end of the spiral tube (14), respectively. The other end of the spiral tube (14) is connected to the first water tank (11) through the water pipe (18). The water pump (17) is installed on the water pipe (18). Several first heat-conducting plates (15) extend from inside the second water tank (13) to connect with the waste heat collection box (16).

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