Low-grade waste heat recycling device

Abstract

The invention discloses a low-grade waste heat recycling device, which relates to the technical field of boiler waste gas filtering equipment, and comprises a boiler, a purification device communicated with the boiler through a conveying pipeline, a shell communicated with the purification device through a conveying pipeline, a T-shaped partition plate fixed in the shell, and a plurality of groups of filter discs rotationally mounted in the shell, wherein each group of filter discs penetrate through the T-shaped partition plate, and drying mechanisms used for removing water on the surfaces and in the filter discs are arranged on the two sides of each group of filter discs. High-temperature and high-pressure waste liquid is introduced through the S-shaped bent pipes and distributed on the two sides of the filter disc in a winding mode, the copper S-shaped bent pipes are matched with the circular fins and the blocking pieces for delaying the flow speed of the waste liquid, heat in the waste liquid is dissipated to a large extent, then the filter disc in the rotating state is dried, the phenomenon of false saturation of the filter disc is avoided, and the service life of the filter disc is prolonged. The filtering effect of the filter disc is guaranteed, the drying difficulty of the filter disc is reduced, and the drying efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of boiler waste gas filtration equipment, and specifically to a low-grade waste heat recovery and utilization device. Background Technique

[0002] Low-grade waste heat refers to the waste heat energy with relatively low temperature (usually below 200°C), small energy density, and difficult to be directly and efficiently utilized generated in industrial production, energy conversion, or daily activities. It is commonly found in industrial cooling water (30°C–90°C), low-temperature flue gas, equipment heat dissipation, domestic wastewater, or air-conditioning exhaust heat, etc. Its characteristics are dispersed heat sources and high recovery costs. Traditional heat engines are difficult to effectively convert, and special technologies such as organic Rankine cycle (ORC), heat pumps, or thermoelectric materials are required to improve the utilization efficiency. Typical applications include low-temperature power generation, district heating, industrial preheating, and drying processes. Although technical challenges and economic constraints limit its large-scale promotion, more than 50% of the industrial waste heat globally belongs to low-grade waste heat. Improving its utilization rate is crucial for reducing dependence on fossil energy and promoting the carbon neutrality goal.

[0003] There is an existing high and medium temperature waste heat recovery and near-zero emission technology for boilers as follows: First, the sewage discharged from the boiler is transported through a pipeline to a pressure reduction and expansion device and undergoes pressure reduction and expansion in a liquid state. By reducing the pressure, part of the water realizes preliminary energy release and steam-water separation due to the pressure change; Subsequently, the liquid substance after pressure reduction and expansion enters the exergy-increasing vaporization stage through a pipeline. At the same time, the superheated steam inside the boiler also accesses this stage through an air extraction unit and a pipeline. This stage utilizes the principle of "exergy" (available energy) improvement. With the high-grade energy of the superheated steam, the liquid substance is further vaporized into gas, forming a gas-solid mixed state; Then the gas-solid mixed substance enters the flow rate adjustment stage through a pipeline. By adjusting, it reaches an appropriate flow rate to create stable conditions for subsequent processing; After that, the gas-solid mixed substance enters the adsorption and purification stage through a pipeline network. Most of the impurities are removed through adsorption to obtain purified gas; Finally, the purified gas enters the steam pipeline network through a pipeline and is transported to heat users through the pipeline network to complete the entire process.

[0004] There are still some problems in the above high and medium temperature waste heat recovery and near-zero emission technology for boilers. First, when the purified gas enters the steam pipeline network through a pipeline, it usually needs to add additional filtration equipment. However, after the filter components inside the existing filtration equipment have been used for a long time, the surface will show a "true saturation" phenomenon due to the attachment of a large number of small solid contaminants, and the inside of the filter element will show a "false saturation" phenomenon due to the accumulation of residual water vapor in the gas. The "true saturation" and "false saturation" phenomena block the surface and inside of the filter element respectively, affecting the filtration effect and the smoothness of the pipeline.

[0005] In view of the above problems, it is urgent to carry out innovative design based on the original filtering equipment. Summary of the invention

[0006] The technical solution of the present invention aims at the technical problem that the existing technical solutions are too single, and provides a solution that is significantly different from the existing technologies. Specifically, the purpose of the present invention is to provide a low-grade waste heat recovery and utilization device to solve the problem raised in the above background technology that the moisture on the filter element and the small solid dirt attached to the surface affect the filtering effect.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: A low-grade waste heat recovery and utilization device, comprising a boiler, a purification device connected to the boiler through a delivery pipeline, and a shell connected to the purification device through a delivery pipeline, and also comprising a T-shaped partition fixed inside the shell, and multiple groups of filter discs rotatably installed inside the shell, wherein each group of filter discs passes through the T-shaped partition; A drying mechanism for removing surface and internal moisture is provided on both sides of each filter disc, wherein the drying mechanism also includes a plurality of groups of S-bends symmetrically arranged on both sides of the filter disc, and two adjacent groups of S-bends are connected end to end, and the output end and the input end of the S-bend are ultimately directly connected to the delivery pipeline of the boiler through the delivery pipeline; A rotating shaft for driving each set of filter discs to rotate is rotatably installed inside the housing, and cleaning mechanisms for cleaning small solid dirt on the surface of the filter discs are symmetrically fixed on one side outer wall of the T-shaped partition and on both sides of the outer walls of the filter discs; A driving component for driving a drying mechanism and a cleaning mechanism is arranged on one side outer wall of the shell.

[0008] Preferably, the drying mechanism also includes a support frame installed on the inner wall of the outer shell by bolts, and the outer wall of the support frame is symmetrically fixed with multiple groups of clips for fixing and limiting the S-bend pipe, a part of the outer wall of the S-bend pipe is fixed with multiple groups of circular fins, and a part of the inner wall of the S-bend pipe is staggered with multiple groups of blocking plates.

[0009] Preferably, the cleaning mechanism includes multiple groups of scrapers symmetrically fixed on the outer wall of one side of the T-shaped partition, each two groups of scrapers are symmetrically arranged with the filter plate as the central axis, and the edges of the two groups of scrapers close to each other are blade-shaped and fit with the surface of the filter plate, and the scrapers are inclined as a whole.

[0010] Preferably, an L-shaped guide plate for guiding scraped small solid dirt is fixed inside the inner wall of the shell and close to the opening of the shell, and a pull-out chip collection box is slidably installed at the bottom end of the inner wall of the shell and below the L-shaped guide plate.

[0011] Preferably, a rectangular opening is formed in the surface of the L-shaped material guiding plate at a position corresponding to the opening of the chip collecting box hopper groove. A chip discharging roller for assisting in conveying small solid dirt is rotatably installed on the inner wall of the housing and above the L-shaped material guiding plate, and the outer wall of the chip discharging roller is attached to the upper surface of the L-shaped material guiding plate.

[0012] Preferably, the driving component further includes a motor installed on one side of the housing through a fixed bracket. A group of synchronous pulleys and a first gear are coaxially and sequentially fixed to the output end of the motor through a coupling. One side outer wall of the connecting central axis of the chip discharging roller penetrates through the outer wall of the housing, and a second gear meshing with the first gear is fixed to the connecting central axis.

[0013] Preferably, one side outer wall of the rotating shaft penetrates through the outer wall of the housing and is fixed with another group of synchronous pulleys, and a synchronous belt is commonly engaged with the outer walls of the two groups of synchronous pulleys.

[0014] Preferably, two groups of communicating first abutting pipes are symmetrically fixed to the two side outer walls of the T-shaped partition plate. Two groups of second abutting pipes are symmetrically connected to the two sides of the inner wall of the housing. Wear-resistant gaskets that are flexibly attached to the surface of the filter disc are installed on the outer walls of the ports of the first abutting pipes and the second abutting pipes.

[0015] Preferably, connecting pipes communicating with the second abutting pipes are fixed to the two side outer walls of the housing. The central axes of the connecting pipes and the first abutting pipes coincide with each other. One of the connecting pipes is connected to the conveying pipeline of the purification device, and the other connecting pipe is communicated with the steam pipe network.

[0016] Preferably, a sealing door is hinged to the outer wall of one side of the opening of the housing. A control box connected to the motor through a wire is fixed to the outer wall of one side of the housing. A one-way air valve is fixed to the outer wall of one side of the housing. The input end of the one-way air valve penetrates through and extends to the inner wall of the housing, and its output end is connected to one of the connecting pipes through a metal pipe.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: Firstly, the device accesses high-temperature and high-pressure waste liquid through an S-shaped pipe and is meanderingly distributed on both sides of the filter disc. By using the copper-made S-shaped pipe in cooperation with circular fins and a resistance piece for delaying the flow rate of the waste liquid, the heat in the waste liquid is dissipated to the greatest extent, and then the filter disc in the rotating state is dried, avoiding the phenomenon of false saturation of the filter disc. While ensuring the filtering effect of the filter disc, the drying difficulty of the filter disc is reduced, and the drying efficiency is improved; Secondly, while the driving component drives multiple groups of filter disks to rotate, it also drives the chip removal roller to rotate. When the filter disks are rotating, the small solid dirt attached to the surface can be scraped off by the scraper, and the small solid dirt scraped off and dropped will fall onto the L-shaped guide plate along the inclined scraper. Some of the small solid dirt will directly fall into the chip collection box through the rectangular opening for automatic collection. At the same time, some of the small solid dirt will directly adhere to the L-shaped guide plate. At this time, the rotating chip removal roller will sweep the small solid dirt into the interior of the chip collection box; Finally, the driving component can use a single power source to drive multiple groups of filter disks to rotate for filtration, and at the same time drive the chip removal roller in the cleaning mechanism to rotate, reducing the energy consumption required for the operation of the equipment and indirectly reducing the use cost of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the main structure of the present invention.

[0019] Figure 2 It is a schematic diagram of the structure of the device of the present invention.

[0020] Figure 3 It is a schematic diagram of the internal structure of the device of the present invention when the housing is opened.

[0021] Figure 4 It is a schematic diagram of the sectional structure of the housing of the device of the present invention.

[0022] Figure 5 It is a schematic diagram of the distribution structure of the drying mechanism and the cleaning mechanism of the present invention.

[0023] Figure 6 It is a schematic diagram of the structure of the driving mechanism of the present invention.

[0024] Figure 7 It is a schematic diagram of the disassembled structure of the drying mechanism of the present invention.

[0025] Figure 8 It is a schematic diagram of the partial internal sectional structure of the S-shaped pipe of the present invention.

[0026] Figure 9 It is a schematic diagram of the structure of the T-shaped partition and the cleaning mechanism of the present invention.

[0027] Figure 10 It is a schematic diagram of the distribution structure of the pipe abutment of the present invention.

[0028] In the figure: 1. Boiler; 11. Purification device; 2. Housing; 21. T-shaped partition; 211. First pipe abutment; 22. Connecting pipe; 23. Second pipe abutment; 24. Sealing door; 25. Check valve; 26. Control box; 3. Rotating shaft; 31. Filter disk; 4. Support frame; 41. Buckle; 42. S-bend pipe; 43. Round fin; 44. Blocking piece; 5. Motor; 51. Synchronous wheel; 52. Synchronous belt; 53. First gear; 54. Second gear; 6. Scraper; 61. L-shaped guide plate; 62. Chip removal roller; 63. Chip collection box. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] See also Figures 1 to 10 The present invention provides a technical solution: a low-grade waste heat recovery and utilization device, comprising a boiler 1, a purification device 11 connected to the boiler 1 through a delivery pipeline, a housing 2 connected to the purification device 11 through a delivery pipeline, and also comprising a T-shaped partition 21 fixed inside the housing 2, and a plurality of groups of filter discs 31 rotatably mounted inside the housing 2, wherein each group of filter discs 31 passes through the T-shaped partition 21; A drying mechanism for removing surface and internal moisture is provided on both sides of each filter disc 31, wherein the drying mechanism further comprises a plurality of S-bends 42 symmetrically arranged on both sides of the filter disc 31, and two adjacent S-bends 42 are connected end to end, and the output end and the input end of the S-bend 42 are ultimately directly connected to the delivery pipeline of the boiler 1 through the delivery pipeline; A rotating shaft 3 is rotatably installed inside the housing 2 for driving each set of filter discs 31 to rotate. Cleaning mechanisms for cleaning small solid dirt on the surface of the filter discs 31 are symmetrically fixed on one side outer wall of the T-shaped partition 21 and on both sides of the outer walls of the filter discs 31. One side outer wall of the housing 2 is provided with a driving component for driving the drying mechanism and the cleaning mechanism.

[0031] In a specific implementation, the interior of the shell 2 is divided into a first chamber and a second chamber (a space formed by the T-shaped partition 21 and the sealing door 24 in a closed state) by a T-shaped partition 21. The gas-solid mixture has been subjected to pressure reduction and capacity expansion treatment before being processed by the purification device 11, so it is at low pressure. The output end and the input end of the S-bend 42 are directly connected to the conveying pipeline for conveying the high-temperature and high-pressure waste liquid generated by the boiler 1, so the liquid in the S-bend 42 is in a high-temperature and high-pressure state. After the low-pressure gas-solid mixture is processed by the purification device 11, it is connected from the connecting pipe 22 on one side to the filter disc 31 to filter the remaining small solid dirt and water vapor again. Two groups of first push pipes 211 and two groups of second push pipes 23 constitute a gas transmission passage, and the two groups of filter discs 31 are distributed between the first push pipe 211 and the second push pipe 23 to filter the low-pressure gas-solid mixture flowing through again. The input end of the one-way valve 25 is connected to the second chamber in the shell 2, and the output end is connected to the connecting pipe 22 on one side through a metal pipe.

[0032] As a further embodiment of the present invention, the drying mechanism also includes a support frame 4 installed on the inner wall of the outer shell 2 by bolts, and the outer wall of the support frame 4 is symmetrically fixed with multiple groups of clips 41 for fixing and limiting the S-bend pipe 42, and part of the outer wall of the S-bend pipe 42 is fixed with multiple groups of circular fins 43, and part of the inner wall of the S-bend pipe 42 is staggeredly fixed with multiple groups of blocking plates 44.

[0033] In a specific implementation, the support frame 4 is in the shape of the letter "N" as a whole, wherein the copper S-bend 42 is fixed and limited by multiple sets of symmetrically fixed buckles 41. The copper S-bend 42 cooperates with multiple sets of circular fins 43 to increase the area of heat conduction and improve the drying intensity. At the same time, the multiple sets of semicircular baffles 44 inside the S-bend 42 can reduce the flow rate of high-temperature wastewater and allow the heat to be dissipated more fully.

[0034] As a further embodiment of the present invention, the cleaning mechanism includes a plurality of groups of scrapers 6 symmetrically fixed on the outer wall of one side of the T-shaped partition 21, and each two groups of scrapers 6 are symmetrically arranged with the filter disc 31 as the central axis, and the edges of one side of the two groups of scrapers 6 close to each other are blade-shaped and fit with the surface of the filter disc 31, and the scraper 6 is inclined as a whole.

[0035] In a specific implementation, the scraper 6 in the front view is in the shape of the letter "V", and the scraper 6 is inclined. The groove can be used to guide the cleaned small solid dirt to the top of the L-shaped guide plate 61. The edges of the scrapers 6 that are close to each other are in contact with the filter disc 31 and are in the shape of blades to ensure that the small solid dirt attached to the surface of the filter disc 31 can be scraped off in a timely and powerful manner, thereby ensuring the cleaning effect.

[0036] As a further embodiment of the present invention, an L-shaped material guide plate 61 for guiding the scraped small solid dirt is fixed inside the inner wall of the outer shell 2 and near the opening of the outer shell 2. A slidable and drawable chip collection box 63 is installed at the bottom end of the inner wall of the outer shell 2 and below the L-shaped material guide plate 61.

[0037] In specific implementation, the L-shaped material guide plate 61 with a guiding function cooperates with the slidable and drawable chip collection box 63 to automatically collect the scraped small solid dirt. When the operator opens the sealing door 24, the chip collection box 63 can be pulled out and the small solid dirt inside can be centrally processed, which reduces the cleaning difficulty and cleaning time to a certain extent.

[0038] As a further embodiment of the present invention, a rectangular opening is provided on the surface of the L-shaped material guide plate 61 at the position corresponding to the opening of the hopper groove of the chip collection box 63. A chip discharge roller 62 for assisting in conveying small solid dirt is rotatably installed above the L-shaped material guide plate 61 on the inner wall of the outer shell 2, and the outer wall of the chip discharge roller 62 is attached to the upper surface of the L-shaped material guide plate 61.

[0039] In specific implementation, the rotating chip discharge roller 62 can timely clean the small solid dirt attached to the upper surface of the L-shaped material guide plate 61, and the small solid dirt will enter the inside of the chip collection box 63 through the rectangular opening.

[0040] As a further embodiment of the present invention, the driving component further includes a motor 5 installed on one side of the outer shell 2 through a fixed bracket. The output end of the motor 5 is coaxially and fixedly installed with a group of synchronous wheels 51 and a first gear 53 in sequence through a coupling. One side outer wall of the connecting central axis of the chip discharge roller 62 penetrates the outer wall of the outer shell 2, and a second gear 54 meshing with the first gear 53 is fixed on this connecting central axis.

[0041] In specific implementation, a group of motors 5 can drive the filter disc 31 to rotate for filtering and at the same time drive the cleaning mechanism to operate, reducing the power source and the use cost of the equipment.

[0042] As a further embodiment of the present invention, one side outer wall of the rotating shaft 3 penetrates to the outer wall of the outer shell 2 and is fixed with another group of synchronous wheels 51, and the outer walls of the two groups of synchronous wheels 51 are jointly engaged with a synchronous belt 52.

[0043] In specific implementation, two corresponding synchronous wheels 51 and a synchronous belt 52 can realize the transmission of power (this is the prior art, so it will not be elaborated here).

[0044] As a further embodiment of the present invention, two groups of interconnected first abutting tubes 211 are symmetrically fixed to the outer walls on both sides of the T-shaped partition 21. Two groups of second abutting tubes 23 are symmetrically connected to the inner walls on both sides of the outer shell 2. Wear-resistant washers that are flexibly fitted to the surface of the filter disc 31 are installed on the outer walls of the ports of the first abutting tubes 211 and the second abutting tubes 23.

[0045] In specific implementation, two groups of first abutting tubes 211 and two groups of second abutting tubes 23 with coincident axis lines are arranged horizontally to form a gas transmission passage. Wear-resistant washers that are flexibly fitted to the surface of the filter disc 31 are installed on the outer walls of the ports of the first abutting tubes 211 and the second abutting tubes 23, which can be fitted and sealed with the surface of the filter disc 31 to the greatest extent, reducing the leakage of the low-pressure gas-solid mixture.

[0046] As a further embodiment of the present invention, connecting tubes 22 that communicate with the second abutting tubes 23 are fixed to the outer walls on both sides of the outer shell 2. The axis lines of the connecting tubes 22 and the first abutting tubes 211 coincide with each other. One side of the connecting tube 22 is connected to the conveying pipeline of the purification device 11, and the other side of the connecting tube 22 is connected to the steam pipe network.

[0047] In specific implementation, first, the gas-solid mixture before being treated by the purification device 11 has undergone pressure reduction and volume expansion treatment, so it is at low pressure. After the low-pressure gas-solid mixture is treated by the purification device 11, it is introduced from one side of the connecting tube 22 and passes through the filter disc 31 to filter the remaining small solid contaminants and water vapor again. The other side of the connecting tube 22 then connects the exhaust gas after re-filtering to the heat user, i.e., the steam pipe network, or directly discharges it to the atmosphere.

[0048] As a further embodiment of the present invention, a sealing door 24 is hinged to the outer wall on one side of the opening of the outer shell 2. A control box 26 that is connected to the motor 5 through a wire is fixed to the outer wall on one side of the outer shell 2. A one-way air valve 25 is fixed to the outer wall on one side of the outer shell 2. The input end of the one-way air valve 25 penetrates and extends to the inner wall of the outer shell 2, and its output end is connected to one side of the connecting tube 22 through a metal tube.

[0049] In specific implementation, sealing washers and sealing grooves are respectively installed on the sealing door 24 and the outer shell 2, which can ensure the airtightness inside the outer shell 2. The input end of the one-way air valve 25 communicates with the second chamber inside the outer shell 2, and the output end communicates with one side of the connecting tube 22 through a metal tube, preventing the explosion caused by the relatively high air pressure inside the second chamber and ensuring the safety of equipment use.

[0050] Working principle: First, the low-pressure gas-solid mixture processed by the purification device 11 is connected through the connecting pipe 22 on one side of the filtering device via the conveying pipeline. At this time, the operator starts the motor 5 in the driving component through the electronic controller in the control box 26. The power of the motor 5 drives the rotating shaft 3 and multiple groups of filter discs 31 to rotate uniformly under the cooperation of a set of synchronous wheels 51 fixedly installed on the outer wall of its output end, another set of synchronous wheels 51 fixedly installed on the outer wall of the rotating shaft 3, and the synchronous belt 52 (since the synchronous belt 52 and the synchronous wheels 51 are prior arts, no further elaboration is made here). Meanwhile, the motor 5 drives the second gear 54 to rotate through the first gear 53 fixedly installed on its outer wall, and the second gear 54 drives the chip removal roller 62 to rotate synchronously; The multiple groups of filter discs 31 rotating at a constant speed cooperate with multiple groups of air pipes (i.e., the air conveying path formed by two groups of first air pipes 211 and two groups of second air pipes 23, and two groups of filter discs 31 are distributed between the first air pipe 211 and the second air pipe 23) to perform multiple filtrations on the passing low-pressure gas-solid mixture. After a period of filtration, small solid contaminants will adhere to the outer wall of the filter disc 31, blocking the filter holes on the surface of the filter disc 31, i.e., the true saturation phenomenon. A certain amount of moisture will adhere to both the surface and the interior of the filter disc 31, further reducing the filtration effect, i.e., the false saturation phenomenon; The interior of the outer shell 2 is divided into two spaces, namely the first chamber and the second chamber (the space formed by the T-shaped partition 21 and the sealed door 24 in the closed state), by the T-shaped partition 21. While the rotating shaft 3 drives the multiple groups of filter discs 31 to rotate, the filtration contact surface between the filter discs 31 and the air pipes (i.e., the air conveying path formed by two groups of first air pipes 211 and two groups of second air pipes 23) will be continuously replaced; First, the input end and the output end of the copper S-shaped pipe 42 in the drying mechanism are directly connected to the conveying pipeline of the boiler 1. By introducing part of the high-temperature waste water into the interior of the outer shell 2 and flowing through it in a winding manner to both sides of the filter disc 31, the S-shaped pipe 42 can reduce the flow rate of the high-temperature waste water to a certain extent by using multiple groups of resistance pieces 44 inside it. When the area of the filter disc 31 that has undergone one filtration on the surface rotates to the second chamber, the relatively high heat contained in the high-temperature waste water dissipates heat and dries both sides of the filter disc 31 through the cooperation of the S-shaped pipe 42 and the circular fins 43. Thus, a certain degree of drying of the moisture on the surface and inside of the filter disc 31 is achieved. By repeating this process continuously, the moisture adhering to the surface and inside of the filter disc 31 can be dried in a timely manner, avoiding the saturation phenomenon of the false filter disc 31, ensuring the filtration effect of the filter disc 31, and reducing the difficulty and cost of cleaning; During the drying process of the moisture adhering to the surface and inside of the filter disc 31, the air pressure inside the second chamber in the outer shell 2 (the space formed by the T-shaped partition 21 and the sealing door 24 in the closed state) will increase due to the continuous accumulation of the evaporated water vapor. The low-pressure gas-solid mixture leaking through the gaps at the tangency between the filter disc 31 and the air delivery pipe (i.e., the air delivery path formed by two groups of first air delivery pipes 211 and two groups of second air delivery pipes 23) and at the tangency between the filter disc 31 and the T-shaped partition 21 will form a closed space due to the continuous high-pressure environment inside the second chamber. When the air pressure inside the second chamber reaches the peak value, the one-way air valve 25 will be automatically triggered to re-introduce the internal gas into the connecting pipe 22 on one side, preventing the explosion caused by the increase of the air pressure inside the equipment and improving the safety of equipment use.

[0051] The dried area on the surface of the filter disc 31 continues to rotate. At this time, the scraper 6 in the cleaning mechanism closely adheres to the filter disc 31 and physically cleans the small solid dirt adhering to its surface. The small solid dirt cleaned and dropped will flow along the inclined V-shaped scraper 6 to the upper surface of the L-shaped material guiding plate 61. Some small solid dirt will directly fall into the chip collection box 63 through the opening, and some small solid dirt adhering to the upper surface of the L-shaped material guiding plate 61 will be pushed by the rotating chip discharging roller 62 to the opening and dropped into the chip collection box 63. The cleaning mechanism automatically cleans and collects the small solid particles on the surface of the filter disc 31, ensuring the filtering effect of the filter disc 31 while reducing the difficulty of manual cleaning.

[0052] Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A low-grade waste heat recovery and utilization device, comprising a boiler (1), a purification device (11) connected to the boiler (1) through a conveying pipeline, and a housing (2) connected to the purification device (11) through a conveying pipeline, characterized in that: It also includes a T-shaped partition (21) fixed inside the housing (2), and a plurality of groups of filter discs (31) rotatably mounted inside the housing (2), wherein each group of filter discs (31) passes through the T-shaped partition (21); Each set of filter discs (31) is provided with drying mechanisms on both sides thereof for removing moisture from the surface and inside thereof, wherein the drying mechanisms further include a plurality of sets of S-bends (42) symmetrically arranged on both sides of the filter discs (31), and two adjacent sets of S-bends (42) are connected end to end, and the output end and the input end of the S-bends (42) are ultimately directly connected to the delivery pipeline of the boiler (1) via a delivery pipeline; A rotating shaft (3) is rotatably mounted inside the housing (2) for driving each group of filter discs (31) to rotate, and cleaning mechanisms for cleaning small solid dirt on the surface of the filter discs (31) are symmetrically fixed on one side outer wall of the T-shaped partition (21) and on both side outer walls of the filter discs (31); A driving component for driving a drying mechanism and a cleaning mechanism is provided on one side outer wall of the housing (2).

2. The low-grade waste heat recovery and utilization device according to claim 1, wherein: The drying mechanism further comprises a support frame (4) mounted on the inner wall of the outer shell (2) by means of bolts, wherein a plurality of groups of buckles (41) for fixing and limiting the S-bend pipe (42) are symmetrically fixed to the outer wall of the support frame (4), a plurality of groups of circular fins (43) are fixed to a portion of the outer wall of the S-bend pipe (42), and a plurality of groups of blocking sheets (44) are staggeredly fixed to a portion of the inner wall of the S-bend pipe (42).

3. A low-grade waste heat recovery and utilization device according to claim 1, characterized in that: The cleaning mechanism comprises a plurality of groups of scrapers (6) symmetrically fixed to the outer wall of one side of the T-shaped partition (21), wherein two groups of the scrapers (6) are symmetrically arranged with the filter disc (31) as the central axis, and the edges of the two groups of scrapers (6) on one side close to each other are both blade-shaped and fit the surface of the filter disc (31), and the scrapers (6) are inclined as a whole.

4. A low-grade waste heat recovery and utilization device according to claim 1, characterized in that: An L-shaped guide plate (61) for guiding scraped small solid dirt is fixed inside the inner wall of the outer shell (2) and close to the opening of the outer shell (2), and a pull-out chip collection box (63) is slidably mounted at the bottom end of the inner wall of the outer shell (2) and below the L-shaped guide plate (61).

5. The low-grade waste heat recovery and utilization device according to claim 4, characterized in that: The surface of the L-shaped guide plate (61) is provided with a rectangular opening at a position corresponding to the opening of the bucket slot of the chip collecting box (63); a chip removal roller (62) for assisting the conveyance of small solid waste is rotatably mounted on the inner wall of the housing (2) and located above the L-shaped guide plate (61); and the outer wall of the chip removal roller (62) is in contact with the upper surface of the L-shaped guide plate (61).

6. The low-grade waste heat recovery and utilization device according to claim 5, wherein: The driving component also includes a motor (5) mounted on one side of the housing (2) via a fixed bracket, a group of synchronous wheels (51) and a first gear (53) being fixedly mounted in sequence on the output end of the motor (5) via a coupling coaxially, an outer wall of one side of the connecting middle shaft of the chip removal roller (62) passing through the outer wall of the housing (2), and a second gear (54) meshing with the first gear (53) being fixed on the connecting middle shaft.

7. The low-grade waste heat recovery and utilization device according to claim 1, characterized in that: One side outer wall of the rotating shaft (3) penetrates through the outer wall of the housing (2) and is fixed with another set of synchronous wheels (51), and the outer walls of the two sets of synchronous wheels (51) are meshed with a synchronous belt (52).

8. The low-grade waste heat recovery and utilization device according to claim 1, characterized in that: On both outer walls of the two sides of the T-shaped partition plate (21), two groups of communicated first abutting pipes (211) are symmetrically fixed. On both sides of the inner wall of the outer shell (2), two groups of second abutting pipes (23) are symmetrically connected. Wear-resistant gaskets that are flexibly attached to the surface of the filter disc (31) are installed on the outer walls of the ports of the first abutting pipes (211) and the second abutting pipes (23).

9. The low-grade waste heat recovery and utilization device according to claim 1, characterized in that: On both outer walls of the outer shell (2), connecting pipes (22) that are communicated with the second abutting pipes (23) are fixed. The axis lines of the connecting pipes (22) and the first abutting pipes (211) coincide with each other. One of the connecting pipes (22) is connected to the conveying pipeline of the purification device (11), and the other connecting pipe (22) is communicated with the steam pipe network.

10. A low-grade waste heat recovery and utilization device according to claim 1, characterized in that: On one side of the opening of the outer shell (2), a sealing door (24) is hinged on the outer wall. On one outer wall of the outer shell (2), a control box (26) that is connected to the motor (5) through a wire is fixed. On one outer wall of the outer shell (2), a one-way air valve (25) is fixed. The input end of the one-way air valve (25) penetrates and extends to the inner wall of the outer shell (2), and its output end is connected to one of the connecting pipes (22) through a metal pipe.

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