A drying heat recovery system, sludge treatment system and water treatment system
By installing a filter and scraper system downstream of the sludge drying equipment, the problem of plate heat exchanger blockage caused by impurities in the drying exhaust gas was solved, and the long-term stable operation of the system was achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- TIANJIN CAPITAL ENVIRONMENTAL PROTECTION GRP CO LTD
- Filing Date
- 2025-05-13
- Publication Date
- 2026-06-12
AI Technical Summary
The large amount of impurities in the drying exhaust gas can easily clog the plate heat exchanger, affecting the stable operation of the sludge treatment system.
A filter is installed downstream of the sludge drying equipment, including a housing, filter element, drive unit, and scraper system. The filter can effectively remove flocculent impurities from the hot exhaust gas. The drive unit works with the scraper system to automatically remove impurities. Combined with pressure monitoring and automatic control system, the cleaning cycle of the plate heat exchanger is extended.
This effectively prevents flocculent impurities from entering the plate heat exchanger, extending the cleaning cycle from three days to six months and ensuring the long-term safe and stable operation of the system.
Smart Images
Figure CN224345576U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of sludge treatment technology, and in particular to a drying heat recovery system, a sludge treatment system and a water treatment system. Background Technology
[0002] Drying heat recovery systems are used to recover the heat energy generated during sludge drying, typically using plate heat exchangers. However, because the drying exhaust gas contains a large amount of impurities, plate heat exchangers are prone to clogging during operation, requiring frequent disassembly and cleaning. This significantly impacts the plate heat exchangers themselves and affects the long-term stable operation of the sludge treatment system. Utility Model Content
[0003] (I) The problem to be solved by this utility model is that the plate heat exchanger is prone to blockage during operation due to the large amount of impurities in the dried exhaust gas.
[0004] (II) Technical Solution
[0005] To address the aforementioned technical problems, one embodiment of this utility model provides a drying heat recovery system, located downstream of a sludge drying device; the drying heat recovery system includes: a filter and a plate heat exchanger;
[0006] The plate heat exchanger has a heat source inlet, which is connected to the sludge drying equipment. The hot exhaust gas generated by the sludge drying equipment enters the plate heat exchanger through the heat source inlet.
[0007] The filter includes a housing, a filter element, a drive unit, and a scraper system;
[0008] The housing is connected between the sludge drying equipment and the heat source inlet. The filter element and the scraper system are both disposed inside the housing. The drive unit is connected to the scraper system and drives the scraper system to operate.
[0009] Furthermore, the housing includes a cylindrical body and a cap;
[0010] The upper end of the cylinder is open, and the cap is detachably installed at the open end of the cylinder; the filter element and the scraper system are both installed inside the cylinder.
[0011] Furthermore, a bracket is provided on the cover, and the drive unit is fixedly mounted on the bracket.
[0012] Furthermore, a drain valve is provided on the cylinder body;
[0013] The filter also includes a pressure monitoring system for monitoring the filtration resistance of the filter element.
[0014] Furthermore, the drain valve is an electrically controlled valve;
[0015] The filter also includes a controller, and both the pressure monitoring system and the drain valve are electrically connected to the controller. The controller controls the operation of the drain valve based on the monitoring information from the pressure monitoring system.
[0016] Furthermore, the controller is fixedly mounted on the cylinder.
[0017] Furthermore, the controller is located near the upper end of the cylinder.
[0018] Furthermore, the cylinder and the cover are detachably connected via a flange.
[0019] Another embodiment of this utility model provides a sludge treatment system, including the above-described drying heat recovery system.
[0020] A third aspect of this utility model also provides a water treatment system, including the sludge treatment system described above.
[0021] The beneficial effects of this utility model are:
[0022] This utility model provides a drying heat recovery system, located downstream of a sludge drying device. The drying heat recovery system includes a filter and a plate heat exchanger. The plate heat exchanger has a heat source inlet, which is connected to the sludge drying device. The hot exhaust gas generated by the sludge drying device enters the plate heat exchanger through the heat source inlet. The filter includes a housing, a filter element, a drive unit, and a scraper system. The housing is connected between the sludge drying device and the heat source inlet. The filter element and the scraper system are both disposed within the housing. The drive unit is connected to the scraper system and drives the scraper system to operate.
[0023] The sludge in the sludge drying equipment contains a large amount of flocculent matter such as hair. By installing the aforementioned filter, these flocculent impurities in the hot exhaust gas can be effectively filtered out, preventing them from entering the plate heat exchanger and causing blockage. Simultaneously, the drive unit, in conjunction with the scraper system, effectively removes flocculent impurities from the filter. Experiments have shown that the cleaning cycle of the plate heat exchanger can be extended from three days in existing technology to once every six months, effectively ensuring the long-term safe and stable operation of the system. Attached Figure Description
[0024] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0025] Figure 1 A schematic diagram of the structure of the filter provided in an embodiment of this utility model.
[0026] Icon: 1 - Filter;
[0027] 11-Shell; 111-Cylinder; 112-Cap; 12-Drive unit; 13-Bracket; 141-Inlet; 142-Outlet; 15-Drain valve; 16-Pressure monitoring system; 17-Controller. Detailed Implementation
[0028] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0029] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.
[0030] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.
[0031] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0032] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.
[0033] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0034] The following detailed description, in conjunction with the accompanying drawings, outlines some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.
[0035] One embodiment of this utility model provides a drying heat recovery system, which is located downstream of a sludge drying device. The sludge drying device is a device used to reduce the moisture content of sludge. During operation, it generates a large amount of hot exhaust gas, which is transported to the drying heat recovery system for recovery to save energy.
[0036] like Figure 1As shown, the aforementioned drying heat recovery system includes a filter 1 and a plate heat exchanger. The plate heat exchanger has a heat source inlet and a heat source outlet 142. The heat source inlet is connected to the aforementioned sludge drying equipment. The hot exhaust gas generated during the operation of the sludge drying equipment enters the plate heat exchanger through the heat source inlet for heat exchange, and is discharged through the heat source outlet 142 after heat exchange is completed. The filter 1 is located between the sludge drying equipment and the plate heat exchanger. Specifically, the filter 1 includes a housing 11, a filter element, a drive unit 12, and a scraper system. The housing 11 is provided with an inlet 141 and an outlet 142. The inlet 141 is connected to the sludge drying equipment, and the outlet 142 is connected to the heat source inlet. The filter element is installed inside the housing 11. The hot exhaust gas enters the housing 11 through the inlet 141 after the drying equipment. After being filtered by the filter element, it is discharged from the housing 11 through the outlet 142 and enters the plate heat exchanger through the heat source inlet. The scraper system is connected to the drive unit 12 for transmission. The drive unit 12 is used to drive the scraper system to automatically or semi-automatically remove the filter cake from the filter element.
[0037] In this embodiment, the sludge in the sludge drying equipment contains a large amount of flocculent matter such as hair. By setting up the aforementioned filter 1, the flocculent impurities in the hot exhaust gas can be effectively filtered out, preventing the flocculent impurities from entering the plate heat exchanger and causing blockage. At the same time, the drive unit 12, in conjunction with the scraper system, can effectively remove the flocculent impurities in the filter 1. After testing, the cleaning cycle of the plate heat exchanger can be extended from three days in the prior art to once every six months, effectively ensuring the long-term safe and stable operation of the system.
[0038] Optionally, in the drying heat recovery system provided in this embodiment of the present invention, the shell 11 includes a cylinder 111 and a cover 112. The upper end of the cylinder 111 is open, and the cover 112 is detachably disposed at the open end of the cylinder 111 for opening or closing the open end of the cylinder 111. The inlet 141 and outlet 142 are both located on the cylinder, and the scraper system and filter element are also disposed within the cylinder.
[0039] Preferably, in this embodiment, the cover 112 and the cylinder 111 are detachably connected by a flange, which has a simple structure, low cost, and is easy to disassemble. Specifically, the cover 112 is a flange blind plate structure, and a flange ring corresponding to the flange blind plate is welded to the outer edge of the upper end of the cylinder 111. The flange blind plate and the flange ring are fixed by bolts.
[0040] Preferably, in this embodiment, the cover 112 and the cylinder 111 are sealed together. Specifically, a sealing ring is also fixedly provided between the flange blind plate and the flange ring to ensure the sealing of the shell 11 and prevent the escape of hot exhaust gas from affecting the environment.
[0041] Optionally, in the drying heat recovery system provided in this embodiment of the present invention, the drive unit 12 is preferably fixedly mounted on the cover 112. The drive unit 12 can be a motor, hydraulic motor, or pneumatic motor, etc. Since the inlet 141 and outlet 142 of the filter 1 are both located on the cylinder 111, the cover 112 has an installation space for mounting the drive unit 12. Specifically, in this embodiment, a bracket 13 is welded onto the cover 112, and the drive unit 12 can be fixedly mounted on the bracket 13 by bolts or other structures. A through hole is provided on the cover 112, and the drive shaft of the drive unit 12 extends into the interior of the filter 1 through the through hole and is connected to the scraper system for transmission. Preferably, the drive shaft of the drive unit 12 is sealed to the through hole.
[0042] Preferably, in this embodiment, a vibration damping pad is also provided between the drive unit 12 and the bracket for vibration reduction. The vibration damping pad can be made of a flexible material such as rubber.
[0043] Optionally, the drying heat recovery system provided in this embodiment of the present invention also includes a drain port on the cylinder 111, and a drain valve 15 is provided at the drain port. When there are too many impurities inside the filter 1, they can be drained through the drain valve 15 to ensure that the drying heat recovery system operates at normal pressure. The above-mentioned drying heat recovery system also includes a pressure monitoring system 16. The pressure monitoring system 16 can be a pressure gauge, which can be installed on the cylinder 111 or between the outlet 142 and the heat source inlet. In this embodiment, the former is preferred, that is, the pressure monitoring system 16 is installed on the cylinder 111. The pressure monitoring system 16 is used to monitor the internal pressure of the filter 1 to obtain the filtration resistance of the filter element. When the filtration resistance of the filter element exceeds the preset value, it indicates that the filter element is blocked. At this time, the drain valve 15 needs to be opened to drain the impurities.
[0044] Furthermore, in the drying heat recovery system provided in this embodiment of the present invention, the opening and closing of the drain valve 15 can be manually operated or automatically controlled. The filter 1 also includes a controller 17, which can be used to control the operation of the drive unit 12, and can also cooperate with the pressure monitoring system 16 to control the opening and closing of the drain valve 15. Specifically, the drain valve 15 is an electrically controlled valve, such as a solenoid valve, an electric gate valve, or an electric butterfly valve. Both the pressure monitoring system 16 and the drain valve 15 are electrically connected to the controller 17. The pressure monitoring system 16 feeds back the filtration resistance of the filter element it monitors to the controller 17. The controller 17 compares this with its internal preset value. When the filtration resistance of the filter element exceeds the preset value, it indicates that the filter element is blocked. At this time, the controller 17 controls the drain valve 15 to open.
[0045] Optionally, in this embodiment, the controller 17 can be a central processing unit (CPU), a network processor (NP), or a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components.
[0046] Preferably, in this embodiment, the controller 17 is fixed to the cylinder by means of screws or welding, to facilitate operation by the operator. More preferably, the controller 17 is positioned near the upper end of the cylinder 111 for easy operation by the operator.
[0047] Another embodiment of this utility model provides a sludge treatment system, including the above-mentioned sludge drying equipment and drying heat recovery system.
[0048] In this embodiment, the sludge generated by the upstream system enters the sludge treatment system and undergoes a series of pretreatments, including anaerobic digestion. Finally, the sludge enters the sludge drying equipment and is dried by heating. During the drying process, the water inside the sludge vaporizes to form hot exhaust gas, which is then transported to the drying heat recovery system through pipelines and other structures.
[0049] The sludge drying equipment provided in this embodiment, by employing the aforementioned drying heat recovery system and incorporating filter 1, effectively filters out flocculent impurities in the hot exhaust gas, preventing these impurities from entering the plate heat exchanger and causing blockage. Simultaneously, the drive unit 12, in conjunction with the scraper system, effectively removes flocculent impurities from filter 1. Experiments have shown that the cleaning cycle of the plate heat exchanger can be extended from three days in existing technologies to once every six months, thus ensuring the long-term safe and stable operation of the sludge treatment system.
[0050] A third aspect of this utility model also provides a water treatment system, including the sludge treatment system described above.
[0051] In this embodiment, the water treatment system generates a large amount of sludge during operation. The sludge is transported to the sludge treatment system for processing. After a series of processes, the sludge is transported to the sludge drying equipment for drying.
[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.
Claims
1. A drying heat recovery system, installed downstream of a sludge drying device; characterized in that, The drying heat recovery system includes: a filter (1) and a plate heat exchanger; The plate heat exchanger has a heat source inlet, which is connected to the sludge drying equipment. The hot exhaust gas generated by the sludge drying equipment enters the plate heat exchanger through the heat source inlet. The filter (1) includes a housing (11), a filter element, a drive unit (12), and a scraper system; The housing (11) is connected between the sludge drying equipment and the heat source inlet. The filter element and the scraper system are both located inside the housing (11). The drive unit (12) is connected to the scraper system and drives the scraper system to operate.
2. The drying heat recovery system according to claim 1, characterized in that, The housing (11) includes a cylindrical body (111) and a cover (112); The upper end of the cylinder (111) is open, and the cover (112) is detachably disposed at the open end of the cylinder (111); the filter element and the scraper system are both disposed inside the cylinder (111).
3. The drying heat recovery system according to claim 2, characterized in that, A bracket (13) is provided on the cover (112), and the drive unit (12) is fixedly mounted on the bracket (13).
4. The drying heat recovery system according to claim 2, characterized in that, A drain valve (15) is provided on the cylinder (111); The filter (1) further includes a pressure monitoring system (16) for monitoring the filtration resistance of the filter element.
5. The drying heat recovery system according to claim 4, characterized in that, The drain valve (15) is an electrically controlled valve; The filter (1) also includes a controller (17), and the pressure monitoring system (16) and the drain valve (15) are both electrically connected to the controller (17). The controller (17) controls the operation of the drain valve (15) based on the monitoring information of the pressure monitoring system (16).
6. The drying heat recovery system according to claim 5, characterized in that, The controller (17) is fixedly mounted on the cylinder (111).
7. The drying heat recovery system according to claim 6, characterized in that, The controller (17) is located near the upper end of the cylinder (111).
8. The drying heat recovery system according to claim 2, characterized in that, The cylinder (111) and the cover (112) are detachably connected by a flange.
9. A sludge treatment system, characterized in that, It includes sludge drying equipment and a drying heat recovery system as described in any one of claims 1 to 8.
10. A water treatment system, characterized in that, Includes the sludge treatment system as described in claim 9.