Sludge incineration system and process with mechanical deep dehydration coupled with heat drying
Through mechanical deep dehydration coupled with the thermally dry sludge incineration system, the flue gas heat is exchanged into water vapor, and the steam power generation device is used to generate exhaust steam, which solves the high cost of steam generation and environmental protection problems in sludge treatment, realizes resource reuse and heat recovery, reduces treatment costs and improves environmental protection effects.
Patent Information
- Application Number
- CN202411828940.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-12
- Publication Date
- 2025-03-11
AI Technical Summary
In the existing sludge treatment technology, the generation of exhaust gas requires the consumption of heat energy, resulting in an increase in treatment costs, and burning coal will cause pollution, affecting the environmental protection effect.
The mechanical deep dehydration coupled thermally drying sludge incineration system is used to exchange the flue gas heat generated by the sludge incineration device into water vapor through a heat exchanger. The steam power generation device is then used to convert the water vapor into exhaust steam, which is used for the sludge thermal drying device and generate electricity to realize resource reuse and heat recovery.
Reuse of resources is realized, production costs are saved, dependence on additional fuel is reduced, environmental protection is improved, and drying efficiency is accelerated through mechanical dehydration, reducing drying energy consumption.
Smart Images
Figure CN119594408A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of sludge treatment, and in particular to a mechanical deep dehydration coupled thermal drying sludge incineration system and process. Background Art
[0002] A large amount of dehydrated sludge will be produced during the treatment of urban domestic sewage. If it is not handled properly, it will cause secondary pollution to the environment. During the sludge treatment process, the sludge will first be dehydrated and dried, and then incinerated to achieve sludge treatment.
[0003] During the sludge drying process, exhaust steam needs to be introduced into the sludge drying device. At present, the generation of exhaust steam requires a certain amount of heat energy. If the heat energy is generated simply through natural gas, coal and other fuels, it will lead to increased processing costs, and other substances will be produced during the combustion of coal, which is not conducive to environmental protection.
[0004] Therefore, it is an urgent problem to provide a processing device and process that can save production costs and improve environmental protection effects. Summary of the invention
[0005] In order to save production costs and improve environmental protection effects, the present application provides a mechanical deep dehydration coupled thermal drying sludge incineration system and process.
[0006] In the first aspect, the present application provides a mechanical deep dehydration coupled thermal drying sludge incineration system, which adopts the following technical solution: A mechanical deep dehydration coupled thermal drying sludge incineration system, comprising: A sludge thermal drying device with an exhaust steam inlet is used for drying the sludge; A sludge incineration device or a sludge pyrolysis device having a waste flue gas exhaust port for incinerating sludge; A heat exchanger having a flue gas channel and a water vapor channel; the flue gas channel having a hot smoke inlet end and a cold smoke outlet end, and the water vapor channel having a water inlet end and a water vapor exhaust end; the hot smoke inlet end of the heat exchanger and the waste smoke exhaust port of the sludge incineration device or the sludge pyrolysis device are connected through a pipeline, so as to exchange the heat of the flue gas to the water vapor channel to form water vapor; A steam power generation device having a water vapor inlet, an exhaust steam outlet and a current output port, which is used to convert water vapor into exhaust steam and electricity; the water vapor inlet of the steam power generation device is connected to the water vapor exhaust end of the heat exchanger through a pipeline; the exhaust steam outlet of the steam power generation device is connected to the exhaust steam inlet of the sludge thermal drying device through a pipeline.
[0007] By adopting the above technical scheme, the sludge incineration device or the sludge pyrolysis device generates flue gas with a large amount of heat during the process of incinerating sludge, and the sludge thermal drying device requires a large amount of exhaust steam during the process of drying sludge. In order to recycle resources, a heat exchanger is used to exchange heat with the flue gas generated by the sludge incineration device or the sludge pyrolysis device to form water vapor, and then a steam power generation device is used to convert the water vapor into the exhaust steam required by the sludge thermal drying device and to generate electricity, which realizes the recycling of resources, saves production costs, and recycles heat without the need for additional burning of coal, thereby improving the environmental protection effect.
[0008] Optionally, it also includes a mechanical sludge dewatering system having a dewatered sludge outlet; The sludge thermal drying device has a dewatered sludge inlet, and a belt conveyor line is connected between the dewatered sludge outlet of the mechanical sludge dewatering system and the dewatered sludge inlet of the sludge thermal drying device.
[0009] By adopting the above technical solution, a mechanical sludge dewatering system is used to mechanically dewater the sludge, which can remove most of the water in the sludge. The mechanically dewatered sludge is then thermally dried, which can accelerate the drying efficiency and reduce the energy required for drying.
[0010] Optionally, a flue gas treatment device is further included; the flue gas treatment device includes a dust treatment unit, the dust treatment unit includes a primary cyclone dust removal unit and a secondary dust removal unit, and the secondary dust removal unit includes: An air delivery pipe having a cold air inlet and a cold air outlet, wherein the air delivery pipe is parallel to the first direction; Two water retaining seats are located in the gas pipe, and the two water retaining seats are spaced apart in a first direction, so that a water storage area is formed by the two adjacent water retaining seats and the inner wall of the gas pipe; in a second direction, one end of the water retaining seat is fixedly connected to the gas pipe, and the other end forms a gap with the inner wall of the gas pipe, and the gap connects the water storage area with the cold air inlet and the cold air outlet; A dust filter is located in the gas pipeline, the dust filter is perpendicular to the first direction, and one end of the dust filter is located in the water storage area; the dust filter is connected to the gas pipeline by rotation around a first axis, and the first axis is parallel to the first direction; and A driving assembly is connected between the dust filter and the air pipe, and is used to drive the dust filter to rotate along the air pipe.
[0011] By adopting the above technical solution, the flue gas contains dust, and the dust needs to be cleaned. For this purpose, a dust filter is provided in the gas pipeline. The dust filter can filter the dust. Dust will adhere to the dust filter. During the rotation of the dust filter, the dust adhered to the dust filter will be mixed into the water in the water storage area. At the same time, since water will continue to adhere to the dust filter, it is easier to adhere to the dust and bring it into the water. In addition, during the rotation of the dust filter, splashing water will be generated, and the water splash can also touch the dust to achieve the effect of dust reduction.
[0012] Optionally, there are multiple dust processing units, and the multiple dust processing units are distributed in the first direction at one time, the air pipes in two adjacent dust processing units are fixedly connected, and the end faces of the water retaining seats of two adjacent dust processing units near one end are in contact with each other.
[0013] By adopting the above technical solution, the dust in the airflow is filtered multiple times using dust filters in multiple dust processing units, so that the dust can be filtered more thoroughly.
[0014] Optionally, the thickness of the water retaining seat in the first direction is greater than cm.
[0015] By adopting the above technical solution, since the water retaining seat has a certain thickness in the first direction, the airflow will mix and flow in the gap for a period of time before entering the water storage area. The airflow will pass through the gap and the water storage area in different air pipes in turn, so that the airflow is converted in the two processes of expansion and gathering and dispersion. When changing between different states, the airflow can be mixed to distribute the dust more evenly and improve the uniformity of dust adhesion on the dust filter net, so that the dust can be removed more thoroughly.
[0016] Optionally, the water retaining seat is hollow.
[0017] By adopting the above technical solution, the deadweight of the water retaining seat can be reduced.
[0018] Optionally, a spoiler rod is connected to one side of the dust filter close to the cold air inlet, and the spoiler rod is located on the side of the first axis.
[0019] By adopting the above technical solution, the spoiler rod will rotate synchronously with the dust filter net, so that the spoiler rod disturbs the airflow, allowing the dust to contact the dust filter net more evenly.
[0020] Optionally, a non-angle is formed between the spoiler rod and the dust filter.
[0021] By adopting the above technical solution, the spoiler rod in an inclined state can stir the airflow more fully.
[0022] Optionally, a spoiler bump is provided on the spoiler rod.
[0023] By adopting the above technical solution, the degree of disturbance to the airflow can be further improved.
[0024] In the second aspect, the present application provides a mechanical deep dehydration coupled thermal drying sludge incineration process, which adopts the following technical solution: A mechanical deep dehydration coupled thermal drying sludge incineration process, using the aforementioned mechanical deep dehydration coupled thermal drying sludge incineration system to treat sludge, comprising the following steps: S1: Use a mechanical sludge dewatering system to mechanically dewater the sludge and output the dewatered sludge; S2: sending the dewatered sludge to the sludge thermal drying device and outputting the dried sludge; S3: sending the dried sludge to a sludge incineration device or a sludge pyrolysis device, outputting the incinerated sludge and flue gas; S4: Flue gas generated by the sludge incineration device or the sludge pyrolysis device during the sludge incineration process is passed into the heat exchanger for heat exchange, and water vapor is output from the heat exchanger; S5: The water vapor outputted from the heat exchanger is sent to a steam power generation device, and the steam power generation device outputs exhaust steam, which can be sent to a sludge thermal drying device for utilization.
[0025] By adopting the above technical solution, the heat in the flue gas can be recovered and utilized through the heat exchanger and the steam power generation device, so that the resource can be reused, the production cost can be saved, and the heat can be recovered and utilized without the need for additional burning of coal, thereby improving the environmental protection effect.
[0026] In summary, the present application includes at least one of the following beneficial technical effects: 1. This application uses a heat exchanger to heat the flue gas generated by the sludge incineration device to form water vapor, and then uses a steam power generation device to convert the water vapor into exhaust steam required by the sludge thermal drying device and generate electricity, which realizes the reuse of resources, saves production costs, and recycles heat without the need to burn additional coal, thereby improving the environmental protection effect; 2. The present application adopts a mechanical sludge dewatering system to mechanically dewater the sludge, which can remove most of the water in the sludge. The mechanically dewatered sludge is then thermally dried, which can accelerate the drying efficiency and reduce the energy required for drying; 3. The dust is treated more thoroughly by using the dust filter in the dust treatment unit and the water in the water storage area. BRIEF DESCRIPTION OF THE DRAWINGS
[0027] Figure 1 It is an overall schematic diagram of the mechanical deep dehydration coupled thermal drying sludge incineration system of the present application; Figure 2It is a structural schematic diagram of the dust treatment unit in the mechanical deep dehydration coupled thermal drying sludge incineration system of the present application; Figure 3 It is a cross-sectional view of a dust treatment unit in the mechanical deep dehydration coupled thermal drying sludge incineration system of the present application; Figure 4 It is a schematic diagram of the structure of the driving components in the mechanical deep dehydration coupled thermal drying sludge incineration system of the present application; Figure 5 yes Figure 4 Enlarged view of part A.
[0028] Explanation of the reference numerals in the accompanying drawings: 1. Air pipe; 11. Cold air inlet; 12. Cold air outlet; 13. Avoidance groove; 14. Gap; 2. Water retaining seat; 21. Water storage area; 3. Dust filter; 4. Drive assembly; 41. External gear ring; 42. Gear; 43. Motor; 44. Guide ring; 441. Ring groove; 45. Rotating ring; 46. Lug; 5. Spoiler rod; 51. Spoiler bump; 6. Connecting column. DETAILED DESCRIPTION
[0029] The following is combined with Figure 1-5 This application is described in further detail.
[0030] The present application discloses a mechanical deep dehydration coupled thermal drying sludge incineration system. Figure 1 The mechanical deep dehydration coupled thermal drying sludge incineration system includes a mechanical sludge dehydration system with a wet sludge inlet and a dehydrated sludge outlet. When in use, the wet sludge is fed into the mechanical sludge dehydration system from the wet sludge inlet, and after mechanical dehydration, the wet sludge is discharged from the dehydrated sludge outlet. The present application also includes a sludge thermal drying device having an exhaust steam inlet, a dewatered sludge feed inlet, and a dried sludge discharge port. The dewatered sludge is fed into the sludge thermal drying device from the dewatered sludge feed port, and then exhaust steam is introduced into the sludge thermal drying device to thermally dry the sludge. After the drying is completed, the dried sludge is discharged from the dried sludge discharge port. In order to improve the degree of processing automation, a belt conveyor line is connected between the dewatered sludge discharge port of the mechanical sludge dewatering system and the dewatered sludge feed inlet of the sludge thermal drying device to realize the transmission of the dewatered sludge between the mechanical sludge dewatering system and the sludge thermal drying device. The mechanical sludge dewatering system is a vertical pressing system, and the sludge mechanical deep dewatering system may include a sludge dilution and agent conditioning system to minimize the moisture content of the sludge after dehydration. The present application also includes a sludge incineration device or a pyrolysis device having a dried sludge inlet and a waste flue gas exhaust port. The dried sludge is sent into the sludge incineration device or the pyrolysis device through the dried sludge inlet for incineration. In order to improve the degree of processing automation, a belt conveyor line is connected between the dried sludge outlet of the sludge thermal drying device and the dried sludge inlet of the sludge incineration device to realize the transmission of the dried sludge between the sludge thermal drying device and the sludge incineration device or the pyrolysis device. During the incineration process, the generated flue gas is discharged from the waste flue gas exhaust port. The present application also includes a heat exchanger having a flue gas channel and a water vapor channel, and heat is exchanged between the flue gas channel and the water vapor channel; specifically, the flue gas channel has a hot smoke inlet end and a cold smoke outlet end, and the hot smoke inlet end of the flue gas channel is connected to the waste smoke exhaust port of the sludge incineration device or the pyrolysis device through a pipeline, and the water vapor channel has a water inlet end and a water vapor exhaust end; the waste smoke enters the flue gas channel from the hot smoke inlet end, and after heat exchange with water in the water vapor channel, the hot smoke is cooled to cold smoke and discharged from the cold smoke outlet end, and the water in the water vapor channel exchanges heat with the flue gas in the flue gas channel to form water vapor and is discharged from the steam exhaust end.
[0031] In some embodiments of the present application, a steam power generation device is also included, which has a water vapor inlet, an exhaust steam outlet and a current output port. The water vapor inlet of the steam power generation device is connected to the steam exhaust end of the water vapor channel in the heat exchanger through a pipeline; after the water vapor enters the steam power generation device, the steam power generation device converts the water vapor into exhaust steam output and outputs electricity. The output electricity can be used to power other equipment in the mechanical deep dehydration coupled thermal drying sludge incineration system, and the electric energy can also be stored through a battery; the exhaust steam outlet of the steam power generation device is connected to the exhaust steam inlet of the sludge thermal drying device through a pipeline, so that the steam power generation device provides exhaust steam for the sludge thermal drying device.
[0032] Reference Figure 2 , Figure 3 and Figure 4 In some embodiments of the present application, a flue gas treatment device is further included, and the flue gas discharged from the flue gas channel of the heat exchanger is sent to the flue gas treatment device for primary treatment. Since the flue gas contains dust, in order to remove the dust, the flue gas treatment device includes a dust treatment unit. The dust treatment unit is a two-stage dust removal unit, which includes a primary cyclone dust removal unit and a secondary dust removal unit. The secondary dust removal unit includes an air delivery pipe 1 with a cold air inlet 11 and a cold air outlet 12, two water retaining seats 2 located in the air delivery pipe 1, and a dust filter 3 located in the air delivery pipe 1; The air pipe 1 is parallel to the first direction, and the second direction is perpendicular to the first direction. In the second direction, one end of the water retaining seat 2 is fixedly connected to the inner wall of the air pipe 1, and a gap 14 is formed between the other end and the inner wall of the air pipe 1. The gap 14 is used to connect the water storage area 21 with the cold air inlet 11 and the cold air outlet 12 for air flow to pass through. The two water retaining seats 2 are spaced apart in the first direction so that a water storage area 21 is formed between the two water retaining seats 2 and the inner wall of the air pipe 1. The water storage area 21 is used to store water. Dust in the air pipe 1 falls onto the water in the water storage area 21, which can prevent the dust from being secondary dusted. In the first direction, the water retaining seat 2 has a certain thickness, and the thickness is greater than 50 cm, and the thickness is preferably 1 m. In order to reduce the weight of the water retaining seat 2, the water retaining seat 2 can be set as a hollow structure; The dust filter 3 is arranged perpendicular to the first direction, and the dust filter 3 is connected to the air pipe 1 by rotating around a first axis, and the first axis is parallel to the first direction; during the rotation of the dust filter 3, the dust filter 3 will contact the water in the water storage area 21 and stir the water in the water storage area 21, and water will splash to increase the contact area between the airflow and the water and mix more dust into the water; in addition, since the dust filter 3 will contact the water in the water storage area 21, the dust on the dust filter 3 will be mixed into the water, and water will always adhere to the dust filter 3, which can increase the contact area between the airflow and the water.
[0033] In order to drive the dust filter 3 to rotate around the air pipe 1, the dust processing unit also includes a driving assembly 4, which includes an outer gear ring 41, a gear 42 and a motor 43. The dust filter 3 in the present disclosure is a disc-shaped net coaxially arranged in the air pipe 1, and the outer gear ring 41 is coaxially fixedly connected to the outer peripheral wall of the dust filter 3. In order to guide the rotation of the outer gear ring 41 along the air pipe 1, two guide rings 44 are coaxially fixedly provided on the inner wall of the air pipe 1. In the first direction, the outer gear ring 41 is located between the two guide rings 44, and a rotating ring 45 is coaxially fixedly connected to the two end walls of the outer gear ring 41. An annular groove 441 adapted to the rotating ring 45 is opened at one end of the guide ring 44 close to the outer gear ring 41. The rotating ring 45 is located in the annular groove 441 and can rotate around the first axis in the annular groove 441; in order to improve the sealing performance, each end of the outer gear ring 41 is in contact with a guide ring 44; In order to install the gear 42, a lug 46 is protrudingly provided on the outer wall of the gas delivery pipe 1, and the gear 42 is rotatably connected to the lug 46 via a first rotating shaft, the first rotating shaft is parallel to the first direction, and the housing of the motor 43 is fixedly connected to the lug 46, and the housing of the motor 43 passes through the lug 46 and is coaxially fixedly connected to the first rotating shaft, so that the motor 43 drives the gear 42 to rotate; In order to connect the gear 42 with the outer gear ring 41, a avoidance groove 13 is opened on the wall of the gas transmission pipe 1. One side of the outer gear ring 41 passes through the avoidance groove 13 and meshes with the outer gear ring 41, so that the motor 43 drives the outer gear ring 41 to rotate synchronously by driving the gear 42 to rotate.
[0034] Reference Figure 4 and Figure 5 In some embodiments of the present application, a spoiler rod 5 is further included, the spoiler rod 5 is located on a side of the dust filter 3 close to the cold air inlet 11, and the spoiler rod 5 can be rotated into the water storage area 21 with the dust filter 3; a plurality of spoiler rods 5 are eccentrically provided on the dust filter 3, and a plurality of spoiler protrusions 51 are convexly provided on the rod wall of the spoiler rod 5, and the plurality of spoiler rods 5 can rotate synchronously with the dust filter 3; Preferably, the spoiler rod 5 and the dust filter net 3 form an angle of non-90°, that is, the spoiler rod 5 and the dust filter net 3 are not perpendicular to each other; In some embodiments, the spoiler rod 5 is fixedly connected to the dust filter 3. In other embodiments, the spoiler rod 5 can rotate along the dust filter 3 around a second axis, and the second axis is arranged parallel to the spoiler rod 5. In order to allow the spoiler rod 5 to rotate, in the present disclosure, a connecting column 6 is fixedly connected to the dust filter 3, the spoiler rod 5 is sleeved on the connecting column 6, and the spoiler rod 5 can rotate along the connecting column 6 around a second axis, and the second axis is parallel to the spoiler rod 5.
[0035] In some embodiments of the present application, a plurality of dust handling units are provided, and the plurality of dust handling units are distributed sequentially along a first direction, and the water retaining seats 2 in two adjacent dust handling units are in contact at the interfaces of the two air pipes 1 to prevent the airflow from entering between the two water retaining seats 2 at the interfaces of the two adjacent dust handling units.
[0036] The implementation principle of a mechanical deep dehydration coupled thermal drying sludge incineration system in the embodiment of the present application is as follows: the dehydrated sludge enters a sludge thermal drying device for drying, and then the dried sludge is incinerated, the flue gas generated during the incineration process exchanges heat with water vapor to discharge water vapor, and then the power generation device converts the water vapor into exhaust steam required by the sludge thermal drying device and outputs electricity, forming a closed loop of resource utilization, effectively saving resources; The flue gas after heat exchange is processed by the flue gas treatment device, the dust is filtered out by the dust filter 3, and then the flue gas is sent to the next process for treatment.
[0037] The present application also discloses a process for treating sludge using the aforementioned mechanical deep dehydration coupled with thermal drying sludge incineration system, comprising the following steps: S1: Use a mechanical sludge dewatering system to mechanically dewater the sludge and output the dewatered sludge; S2: sending the dewatered sludge to the sludge thermal drying device and outputting the dried sludge; S3: sending the dried sludge to a sludge incineration device or a pyrolysis device, outputting the incinerated sludge and flue gas; S4: Flue gas generated by the sludge incineration device or the pyrolysis device during the sludge incineration process is passed into the heat exchanger for heat exchange, and water vapor is output from the heat exchanger; S5: The water vapor output by the heat exchanger is sent to the steam power generation device, and the steam power generation device outputs exhaust steam. The exhaust steam can be sent to the sludge thermal drying device for use, and the generated electricity can also be used for the mechanical deep dehydration coupled thermal drying sludge incineration system.
[0038] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.
Claims
1. A mechanical deep dehydration coupled thermal drying sludge incineration system, characterized in that: include: A sludge thermal drying device with an exhaust steam inlet is used for drying the sludge; A sludge incineration device or a sludge pyrolysis device having a waste flue gas exhaust port for incinerating sludge; A heat exchanger having a flue gas channel and a water vapor channel; The flue gas channel has a hot smoke inlet end and a cold smoke outlet end, and the water vapor channel has a water inlet end and a water vapor exhaust end; the hot smoke inlet end of the heat exchanger and the waste smoke exhaust port of the sludge incineration device or the sludge pyrolysis device are connected through a pipeline, which is used to exchange the heat of the flue gas to the water vapor channel to form water vapor; A steam power generation device having a water vapor inlet, an exhaust steam outlet and a current output port, which is used to convert water vapor into exhaust steam and electricity; the water vapor inlet of the steam power generation device is connected to the water vapor exhaust end of the heat exchanger through a pipeline; the exhaust steam outlet of the steam power generation device is connected to the exhaust steam inlet of the sludge thermal drying device through a pipeline.
2. The mechanical deep dehydration coupled thermal drying sludge incineration system according to claim 1 is characterized in that: Also included is a mechanical sludge dewatering system having a dewatered sludge outlet; The sludge thermal drying device has a dewatered sludge inlet, and a belt conveyor line is connected between the dewatered sludge outlet of the mechanical sludge dewatering system and the dewatered sludge inlet of the sludge thermal drying device.
3. The mechanical deep dehydration coupled thermal drying sludge incineration system according to claim 2 is characterized in that: It also includes a flue gas treatment device; the flue gas treatment device includes a dust treatment unit, the dust treatment unit includes a primary cyclone dust removal unit and a secondary dust removal unit, the secondary dust removal unit includes: An air delivery pipe (1) having a cold air inlet (11) and a cold air outlet (12), wherein the air delivery pipe (1) is parallel to a first direction; Two water retaining seats (2) are located in the gas pipeline (1), and the two water retaining seats (2) are spaced apart in a first direction, so that a water storage area (21) is formed by the two adjacent water retaining seats (2) and the inner wall of the gas pipeline (1); in a second direction, one end of the water retaining seat (2) is fixedly connected to the gas pipeline (1), and the other end forms a gap (14) with the inner wall of the gas pipeline (1), and the gap (14) connects the water storage area (21) with the cold air inlet (11) and the cold air outlet (12); a dust filter (3) located in the gas pipeline (1), the dust filter (3) being perpendicular to the first direction, and one end of the dust filter (3) being located in the water storage area (21); the dust filter (3) being rotatably connected to the gas pipeline (1) around a first axis, the first axis being parallel to the first direction; and A driving component (4), the driving component (4) is connected between the dust filter (3) and the air pipe (1), and is used to drive the dust filter (3) to rotate along the air pipe (1).
4. The mechanical deep dehydration coupled thermal drying sludge incineration system according to claim 3 is characterized in that: The dust processing units are provided in plurality and are distributed in a first direction at one time, the air pipes (1) in two adjacent dust processing units are fixedly connected, and the end faces of the water retaining seats (2) at one end of the two adjacent dust processing units are in contact with each other.
5. The mechanical deep dehydration coupled thermal drying sludge incineration system according to claim 4 is characterized in that: The thickness of the water retaining seat (2) in the first direction is greater than 50 cm.
6. The mechanical deep dehydration coupled thermal drying sludge incineration system according to claim 5 is characterized in that: The water retaining seat (2) is hollow.
7. A mechanical deep dehydration coupled thermal drying sludge incineration system according to any one of claims 3 to 6, characterized in that: A spoiler rod (5) is connected to one side of the dust filter (3) close to the cold air inlet (11), and the spoiler rod (5) is located on the side of the first axis; the spoiler rod (5) can be rotated into the water storage area (21) along with the dust filter (3).
8. The mechanical deep dehydration coupled thermal drying sludge incineration system according to claim 7 is characterized in that: The spoiler rod (5) and the dust filter (3) form an angle other than 90°.
9. The mechanical deep dehydration coupled thermal drying sludge incineration system according to claim 7 is characterized in that: The spoiler rod (5) is provided with a spoiler protrusion (51).
10. A mechanical deep dehydration coupled with thermal drying sludge incineration process, characterized in that: The sludge is treated by using the mechanical deep dehydration coupled thermal drying sludge incineration system as described in any one of claims 1 to 9, comprising the following steps: S1: Use a mechanical sludge dewatering system to mechanically dewater the sludge and output the dewatered sludge; S2: sending the dewatered sludge to the sludge thermal drying device and outputting the dried sludge; S3: sending the dried sludge to a sludge incineration device or a sludge pyrolysis device, outputting the incinerated sludge and flue gas; S4: Flue gas generated by the sludge incineration device or the sludge pyrolysis device during the sludge incineration process is passed into the heat exchanger for heat exchange, and water vapor is output from the heat exchanger; S5: The water vapor outputted from the heat exchanger is sent to a steam power generation device, and the steam power generation device outputs exhaust steam, which can be sent to a sludge thermal drying device for utilization.