Sludge drying treatment method and device based on circulating fluidized bed boiler

Abstract

The invention provides a sludge drying treatment method and device based on a circulating fluidized bed boiler, and belongs to the technical field of sewage treatment. Wet sludge to be treated is conveyed to a heat exchange bed of a heat exchange chamber in a fluidized bed sludge dryer through a wet sludge screw conveyor by a self-wetting sludge hopper; first flue gas is blown in through a first air distribution plate, so that the wet sludge material enters a suspended state and exchanges heat with the heat exchange flue gas to form sludge drying particles; wherein the first air distribution plate is arranged below the heat exchange bed, and the first flue gas is blown in from bottom to top; the moisture content of the sludge drying particles is 20%-40%; the sludge drying particles are conveyed into a fluidized bed incinerator to be combusted, and sludge drying treatment is completed; tail smoke output by the fluidized bed incinerator is fed into the first air distribution plate through a tail gas conveying pipeline by means of a fluidization fan to serve as first smoke. According to the invention, the technical effects of high treatment efficiency, low energy consumption and avoidance of secondary pollution can be achieved.

Description

Technical Field

[0001] The invention relates to the technical field of sewage treatment, and in particular to a sludge drying treatment method and device based on a circulating fluidized bed boiler. Background Art

[0002] With the acceleration of urbanization and the development of industry, the amount of sewage treatment is increasing, and the amount of sludge generated is also increasing. Sludge is an inevitable byproduct of sewage treatment, containing a large amount of organic matter, pathogens, heavy metals and persistent organic pollutants. If it is not properly treated, it will cause serious pollution to the environment.

[0003] Traditional sludge treatment methods mainly include landfill, incineration, composting and land utilization. Among them, although landfill has low cost, it occupies a large amount of land resources and has the risk of leakage, which may cause groundwater and soil pollution. Although incineration can greatly reduce the volume of sludge, it has high investment and operating costs and may produce harmful gases and ash. Although composting can convert sludge into organic fertilizer, the treatment cycle is long, and the content of heavy metals and pathogens in the product may not meet safety standards. Although land utilization can be used as a soil conditioner, pollutants in sludge may enter the food chain and affect the ecological environment and human health. In addition, the existing sludge treatment technology also has the following disadvantages: low treatment efficiency, high energy consumption, and the generation of harmful gases, wastewater or solid waste during the treatment process, causing secondary pollution.

[0004] Therefore, there is an urgent need for an efficient, environmentally friendly and economical sludge drying treatment method and device based on a circulating fluidized bed boiler. Summary of the invention

[0005] The object of the present invention is to provide a sludge drying treatment method and device based on a circulating fluidized bed boiler to solve at least one technical problem existing in the prior art.

[0006] The present invention protects a sludge drying treatment method based on a circulating fluidized bed boiler, comprising: conveying wet sludge material to be treated from a wet sludge hopper to a heat exchange bed in a heat exchange chamber of a fluidized bed sludge dryer through a wet sludge screw conveyor; the moisture content of the wet sludge material to be treated is 50% to 70%;

[0007] The first flue gas is blown in through the first air distribution plate, so that the wet sludge material enters a suspended state and performs heat exchange with the heat exchange flue gas to form sludge drying particles; wherein the first air distribution plate is arranged under the heat exchange bed, and the first flue gas is blown in from bottom to top; the moisture content of the sludge drying particles is 20% to 40%;

[0008] The sludge drying particles are transported into a fluidized bed incinerator for combustion to complete the sludge drying process; wherein, the tail flue gas output from the fluidized bed incinerator is transported into the first air distribution plate through the tail gas transport pipeline as the first flue gas by a fluidized fan.

[0009] Furthermore, a preferred method is that after the wet sludge material enters a suspended state, it also includes blowing in heat exchange flue gas through a second air distribution plate, so that the wet sludge material in the suspended state enters a rotating suspended state and forms a fluidized sludge suspension layer; wherein the second air distribution plate is arranged on one side of the heat exchange bed, and the heat exchange flue gas is blown in horizontally; the heat exchange flue gas comes from the tail flue gas output by the fluidized bed incinerator.

[0010] Further, a preferred method is that the method of conveying the dried sludge particles into a fluidized bed incinerator for combustion comprises:

[0011] The dust-containing gas containing the dried sludge particles enters the bag filter from the top of the heat exchange chamber in the fluidized bed sludge dryer through the particle upward air duct to perform gas-solid separation of the dried sludge particles and the gas;

[0012] The dried sludge particles collected by the bag filter are transported to the fluidized bed incinerator through a dry sludge conveying pipeline by a dry sludge screw conveyor for combustion.

[0013] Furthermore, a preferred method is that, the dry sludge screw conveyor and the Roots blower form a closed conveying system; and the pressure and air volume of the Roots blower are adjusted according to the particle size of the dried sludge particles.

[0014] Further, the preferred method is that the step of conveying the dried sludge particles collected by the bag filter to the fluidized bed incinerator through a dry sludge conveying pipeline by a dry sludge screw conveyor for combustion comprises:

[0015] After the dust cleaning process, the dried sludge particles attached to the surface of the filter bag of the bag filter fall into the ash hopper;

[0016] The sludge outlet gate valve is opened, and the dried sludge particles enter the dry sludge screw conveyor from the ash hopper through the sludge discharger.

[0017] Furthermore, a preferred method is that after the bag filter performs gas-solid separation, the gas is discharged through a chimney after being desulfurized.

[0018] Furthermore, a preferred method is that the dried sludge particles in the fluidized bed incinerator are burned at high temperature in the incineration chamber of the fluidized bed incinerator; wherein the temperature of the incineration chamber of the fluidized bed incinerator is 850°C;

[0019] The residue produced after high-temperature combustion is discharged using the incinerator slag removal system.

[0020] Furthermore, a preferred method is that the temperature of the tail flue gas output by the fluidized bed incinerator is 120°C to 160°C.

[0021] Furthermore, a preferred method is that the wet sludge material to be treated is transported to the wet sludge hopper via a wet sludge feed belt.

[0022] The present invention also protects a sludge drying treatment device based on a circulating fluidized bed boiler, which is used to implement the sludge drying treatment method based on a circulating fluidized bed boiler as described above;

[0023] It comprises a sludge drying unit, a sludge conveying unit for conveying wet sludge material to the sludge drying unit, and an incineration unit for incinerating dried sludge particles;

[0024] The sludge conveying unit comprises a wet sludge hopper and a wet sludge screw conveyor for connecting the wet sludge hopper and the sludge drying unit;

[0025] The sludge drying unit comprises a fluidized bed sludge dryer, which comprises a heat exchange bed, a first air distribution plate and a fluidizing fan arranged in a heat exchange chamber; the first air distribution plate is arranged under the heat exchange bed; the fluidizing fan transports the first flue gas blown from bottom to top to the heat exchange bed through the first air distribution plate;

[0026] The incineration unit comprises a fluidized bed incinerator and an exhaust gas delivery pipeline; the input end of the exhaust gas delivery pipeline is connected to the fluidized bed incinerator, and the output end of the exhaust gas delivery pipeline is connected to the input end of the fluidizing fan.

[0027] As described above, the sludge drying treatment method and device based on a circulating fluidized bed boiler of the present invention transports the wet sludge material to be treated to the heat exchange bed in the heat exchange chamber of the fluidized bed sludge dryer through a wet sludge hopper through a wet sludge screw conveyor; blows in the first flue gas through a first air distribution plate, so that the wet sludge material enters a suspended state and exchanges heat with the heat exchange flue gas to form sludge drying particles; wherein the first air distribution plate is arranged under the heat exchange bed, and the first flue gas is blown in from bottom to top; the sludge drying particles The moisture content is 20% to 40%; the sludge drying particles are transported into a fluidized bed incinerator for combustion to complete the sludge drying treatment; wherein, the tail flue gas output by the fluidized bed incinerator is transported into the first air distribution plate through the tail gas conveying pipeline by a fluidized fan as the first flue gas; by using the recovered tail flue gas of the fluidized bed incinerator as the heat exchange flue gas of the fluidized bed sludge dryer, not only the secondary pollution can be avoided, but also the technical effect of improving the sludge drying treatment efficiency and reducing energy consumption can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] By referring to the following description and claims in conjunction with the accompanying drawings, and with a more comprehensive understanding of the present invention, other objects and results of the present invention will become more apparent and easier to understand. In the accompanying drawings:

[0029] Figure 1 It is a schematic flow chart of a sludge drying treatment method based on a circulating fluidized bed boiler according to an embodiment of the present invention.

[0030] Figure 2 It is a schematic structural diagram of a sludge drying treatment device based on a circulating fluidized bed boiler according to an embodiment of the present invention.

[0031] Among them: 1. Wet sludge feeding belt; 2. Wet sludge hopper; 3. Wet sludge screw conveyor; 4. Fluidized bed sludge dryer; 5. Particle upward air duct; 6. Bag dust collector; 7. Sludge outlet gate valve; 8. Sludge unloader; 9. Dry sludge screw conveyor; 10. Roots blower; 11. Material seal pump; 12. Dry sludge conveying pipeline; 13. Exhaust gas conveying pipeline; 14. Fluidized bed fan; 15. Heat exchange air duct; 16. Clean air duct; 17. Draft fan; 18. Desulfurization equipment. DETAILED DESCRIPTION

[0032] In the following description, for the purpose of illustration, in order to provide a comprehensive understanding of one or more embodiments, many specific details are set forth. However, it is apparent that these embodiments may also be implemented without these specific details. In other examples, for ease of describing one or more embodiments, well-known structures and devices are shown in the form of block diagrams.

[0033] It should be understood that terms such as "horizontal", "vertical", "up", "down", "top", "middle", "length", "inside", and "bottom" indicating directions or positional relationships are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific direction, be constructed and operate in a specific direction, and therefore should not be understood as limiting the present invention.

[0034] Unless otherwise clearly defined and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, they can be fixedly connected, detachably connected, or integrated; they can be mechanically connected, electrically connected, or able to communicate with each other; they can be directly connected, or indirectly connected through an intermediate medium, and they can be internally connected between two elements or an interactive relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] Various embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0036] Figure 1-Figure 2 The sludge drying treatment plant based on circulating fluidized bed boiler is generally described. Specifically, Figure 1 It is a schematic flow chart of a sludge drying treatment device based on a circulating fluidized bed boiler according to an embodiment of the present invention. Figure 2 It is a schematic structural diagram of a sludge drying treatment device based on a circulating fluidized bed boiler according to an embodiment of the present invention.

[0037] like Figure 1 As shown, the sludge drying treatment device based on the circulating fluidized bed boiler provided by the present invention includes, S110, conveying the wet sludge material to be treated from the wet sludge hopper to the heat exchange bed of the heat exchange chamber in the fluidized bed sludge dryer through the wet sludge screw conveyor; the moisture content of the wet sludge material to be treated is 50% to 70%. The wet sludge material to be treated is conveyed to the wet sludge hopper through the wet sludge feeding belt.

[0038] S120. Blowing in the first flue gas through the first air distribution plate causes the wet sludge material to enter a suspended state and perform heat exchange with the heat exchange flue gas to form sludge drying particles; wherein the first air distribution plate is arranged under the heat exchange bed, and the first flue gas is blown in from bottom to top; the moisture content of the sludge drying particles is 20% to 40%.

[0039] After the wet sludge material enters the suspended state, the heat exchange flue gas is blown in through the second air distribution plate, so that the wet sludge material in the suspended state enters the rotating suspended state and forms a fluidized sludge suspension layer; wherein the second air distribution plate is arranged on one side of the heat exchange bed, and the heat exchange flue gas is blown in horizontally; the heat exchange flue gas comes from the tail flue gas output by the fluidized bed incinerator. The temperature of the tail flue gas output by the fluidized bed incinerator is 120℃~160℃.

[0040] S130, conveying the dried sludge particles into a fluidized bed incinerator for combustion to complete the sludge drying process; wherein, the tail flue gas outputted from the fluidized bed incinerator is conveyed into the first air distribution plate through the tail gas conveying pipeline by a fluidized fan as the first flue gas. The dried sludge particles in the fluidized bed incinerator are subjected to high-temperature combustion in the incineration chamber of the fluidized bed incinerator; wherein, the temperature of the incineration chamber of the fluidized bed incinerator is 850°C; the residue produced after high-temperature combustion is discharged by the incinerator slag removal system.

[0041] The method for conveying the sludge drying particles into a fluidized bed incinerator for combustion includes: S131, the dust-containing gas containing the sludge drying particles enters the bag filter through the particle upward air duct from the top of the heat exchange chamber in the fluidized bed sludge dryer to perform gas-solid separation of the sludge drying particles and gas; S132, the sludge drying particles collected by the bag filter are conveyed to the fluidized bed incinerator through a dry sludge conveying pipeline by a dry sludge screw conveyor for combustion. The dry sludge screw conveyor and the Roots blower form a closed conveying system; and the pressure and air volume of the Roots blower are adjusted according to the particle size of the sludge drying particles.

[0042] The step of conveying the dried sludge particles collected by the bag filter to the fluidized bed incinerator through a dry sludge conveying pipeline by a dry sludge screw conveyor for combustion includes: S1321, after ash cleaning, the dried sludge particles attached to the filter bag surface of the bag filter fall into the ash hopper; S1322, opening the sludge outlet gate valve, and the dried sludge particles enter the dry sludge screw conveyor from the ash hopper through the sludge discharger. After the bag filter performs gas-solid separation, the gas is discharged through the chimney after desulfurization.

[0043] like Figure 2 As shown, the present invention also protects a sludge drying treatment device based on a circulating fluidized bed boiler, which is used to implement the sludge drying treatment device based on a circulating fluidized bed boiler as described above; it includes a sludge drying unit, a sludge conveying unit for conveying wet sludge material to the sludge drying unit, and an incineration unit for incinerating sludge dried particles; the sludge conveying unit includes a wet sludge hopper 2 and a wet sludge screw conveyor 3 for connecting the wet sludge hopper 2 and the sludge drying unit; a wet sludge incoming belt 1 for conveying the wet sludge material to be treated is arranged above the wet sludge hopper 2. The sludge drying unit includes a fluidized bed sludge dryer 4; the fluidized bed sludge dryer includes a heat exchange bed, a first air distribution plate and a fluidizing fan 14 arranged in a heat exchange chamber; the first air distribution plate is arranged under the heat exchange bed; the fluidizing fan 14 conveys the first flue gas blown from bottom to top to the heat exchange bed through the first air distribution plate; the incineration unit includes a fluidized bed incinerator and an exhaust gas conveying pipeline; the input end of the exhaust gas conveying pipeline 13 is connected to the fluidized bed incinerator, and the output end of the exhaust gas conveying pipeline 13 is connected to the input end of the fluidizing fan. The temperature of the incineration chamber of the fluidized bed incinerator is 850°C.

[0044] When particles are exposed to the wind, the surrounding air velocity will generate a force on the particles. This force is called drag force, and its magnitude is related to the windward area of ​​the particles, the air velocity and the air density. The wind from bottom to top can be decomposed into a vertical upward component and a lateral component. The vertical upward component helps the particles to rise; that is, the first air distribution plate provides a vertical upward lift for the wet sludge material in the heat exchange chamber, so that the wet sludge material becomes wet sludge particles in a suspended state. The fluidizing fan arranged at the bottom of the fluidized bed sludge dryer 4 provides high-speed fluidized hot flue gas, which blows up the sludge through the hood of the air distribution plate at the bottom of the bed and puts it in a suspended state. This part of the flue gas accounts for about 50% of the total hot flue gas.

[0045] In order to improve the drying efficiency of the fluidized bed sludge dryer 4, a second air distribution plate is also provided on one side of the heat exchange bed, and heat exchange flue gas is blown in through the second air distribution plate, and the heat exchange flue gas enters the heat exchange chamber through the heat exchange air duct 15; the heat exchange flue gas is blown in horizontally; the heat exchange flue gas comes from the tail flue gas output by the fluidized bed incinerator. The lateral component may cause the particles to rotate. The lateral wind will generate lift force on the particles. If the shape of the particles is asymmetrical, this lift force can cause the particles to rotate around their center of gravity. This phenomenon is similar to the working principle of an airplane wing. The heat exchange flue gas that is cut in horizontally is arranged in the fluidized bed sludge dryer 4 to change the movement form of the suspended sludge particles from vertical rise to rotational rise, increase the tumbling strength of the sludge particles, and accelerate the decomposition and heat exchange of the wet sludge particles.

[0046] The sludge drying unit also includes a bag filter 6 for gas-solid separation of sludge drying particles and gas; the bag filter 6 is arranged at the top of the heat exchange chamber in the fluidized bed sludge dryer 4; a particle upward air duct 5 is arranged between the heat exchange chamber and the bag filter; a dry sludge screw conveyor 9 and a dry sludge conveying pipeline 12 are arranged below the bag filter 6, and the dry sludge screw conveyor 9 is connected to the fluidized bed incinerator through the dry sludge conveying pipeline 12. The working process of the bag filter 6 includes that the dust-containing gas is introduced into the inlet of the bag filter under the action of the fan. Before the gas enters the filter bag, there is usually a pretreatment stage, such as gravity sedimentation, inertial separation, etc., to remove larger particles of dust and reduce the burden of the filter bag. When the dust-containing gas passes through the filter bag, the dust particles are intercepted by the fibers of the filter bag, or adsorbed on the surface of the filter bag due to electrostatic action, and the clean gas passes through the filter bag fibers and enters the inside of the filter bag. As the filtering process proceeds, the dust forms a layer of dust cake on the outer surface of the filter bag. When the dust on the outer surface of the filter bag accumulates to a certain extent, it will affect the dust removal efficiency and the normal operation of the system, and cleaning is required at this time. There are many ways to clean the dust, including mechanical vibration, backwash (reverse airflow), pulse jet, etc. During cleaning, the filter bag will expand or vibrate rapidly, causing the dust attached to the surface of the filter bag to fall off and fall into the ash hopper. The dust collected in the ash hopper can be discharged regularly by gravity, screw conveyors, dischargers and other equipment. After filtering and cleaning, the clean gas is discharged from the inside of the filter bag and discharged from the system through the outlet. The bag filter is usually equipped with a control system to automatically control the cleaning cycle, monitor parameters such as temperature and pressure, and ensure stable operation of the equipment. An induced draft fan 17 is arranged between the gas outlet of the bag filter 6 and the desulfurization equipment 18. The desulfurization equipment 18 is used to treat sulfur oxides in boiler flue gas and reduce environmental pollution. The induced draft fan 17 uses voice to provide the negative pressure or positive pressure required by the system to ensure gas flow.

[0047] In order to further improve the transportation efficiency of the dried sludge particles, the dry sludge screw conveyor 9 and the Roots blower 10 form a closed conveying system for conveying dried sludge particles; the air outlet of the Roots blower 10 is connected to the air inlet of the dry sludge screw conveyor 9. In some bulk material conveying systems, the bolt conveyor may need to be used in conjunction with the Roots blower, especially in the pneumatic conveying system. The pneumatic conveying system uses airflow to transport materials to the destination through a pipeline, and the Roots blower can provide the necessary high-pressure airflow for such a system. In this case, the bolt conveyor can be used as a component of the pneumatic conveying system to feed materials into the feed port of the pneumatic conveying system. Specifically, before installation, check whether the conveyor and its parts are intact. Measure the size of the reserved hole at the installation site to ensure that it matches the size of the installation hole of the conveyor support plate. Bolt each section of the conveyor to ensure that it is in a straight line after connection. Set the feed port and discharge port on site as needed, and ensure that the broken weld is sealed with sealant to prevent leakage. Then proceed with the installation of the Roots blower: Choose a solid foundation to ensure that the blower is stable and reliable after installation. Connect the air inlet and outlet of the blower to the corresponding pipes. The electrical connection should be completed by a professional electrical engineer, and ensure that the cable connection, power supply current and frequency meet the design requirements. Install a muffler and shock absorber to reduce noise and vibration. Relative setting of the pneumatic conveying system: Ensure that the air outlet of the Roots blower is correctly connected to the air inlet of the bolt conveyor to form a closed conveying system. Adjust the pressure and air volume of the blower to suit the characteristics of the material and the conveying distance. Ensure that all connections of the entire system are sufficiently sealed to prevent air leakage. Before starting the Roots blower, perform a no-load test run to check whether the operating sound and vibration of the blower are normal. Gradually increase the working load of the blower, while observing the operating status and temperature of the blower. Debug the conveying system to ensure that the material can be smoothly transported to the destination. Ensure that all safety regulations are followed during installation, including wearing appropriate safety equipment. Regularly check the operating conditions of the bolt conveyor and Roots blower, and perform maintenance and repairs in a timely manner. After completing the above steps, the bolt conveyor and Roots blower should be able to work together to achieve effective pneumatic conveying.

[0048] An ash hopper for collecting the dried sludge particles attached to the surface of the filter bag of the bag-type dust collector is provided below the bag-type dust collector 6; a sludge outlet gate valve 7 is provided below the ash hopper; a sludge discharger 8 and the dry sludge screw conveyor 9 are provided below the ash hopper. The gas outlet of the bag-type dust collector 6 is connected to the desulfurization equipment 18, and a chimney is provided at the gas outlet of the desulfurization equipment 18. An incinerator slag removal system for discharging the residue generated after the high-temperature combustion of the dried sludge particles is provided on the fluidized bed incinerator. The temperature of the tail flue gas output by the fluidized bed incinerator is 120°C to 160°C.

[0049] In general, the wet sludge material enters the wet sludge screw conveyor 3 through the wet sludge feed belt 1 and the wet sludge hopper 2, and is then transported to the fluidized bed sludge dryer 4. In the fluidized bed sludge dryer 4, the wet sludge is dried into particles through the heat source provided by the fluidizing fan 14 and the exhaust gas conveying pipeline 13. During the drying process, the particle upward air duct 5 transports the dust and moist hot gas to the bag filter 6 for dust removal. The clean gas after dust removal is discharged through the clean air duct 16, and the dried sludge is transported to subsequent storage or processing facilities through the sludge discharger 8, the dry sludge screw conveyor 9 and the material sealing pump 11 and other equipment. The Roots blower 10 and the induced draft fan 17 provide the necessary wind pressure and air volume in the entire system.

[0050] In summary, the present invention provides a sludge drying treatment method and device based on a circulating fluidized bed boiler, wherein the wet sludge material to be treated is transported to the heat exchange bed of the heat exchange chamber in the fluidized bed sludge dryer through a wet sludge hopper through a wet sludge screw conveyor; the first flue gas is blown in through a first air distribution plate, so that the wet sludge material enters a suspended state and performs heat exchange with the heat exchange flue gas to form sludge drying particles; wherein the first air distribution plate is arranged under the heat exchange bed, and the first flue gas is blown in from bottom to top; the moisture content of the sludge drying particles is 20% to 40%; the sludge drying particles are transported into a fluidized bed incinerator for combustion to complete the sludge drying treatment; wherein the tail flue gas output from the fluidized bed incinerator is transported into the first air distribution plate as the first flue gas through a tail gas conveying pipeline by a fluidized fan. The present invention can achieve the technical effects of high treatment efficiency, low energy consumption, and avoidance of secondary pollution.

[0051] However, those skilled in the art should understand that various improvements can be made to the sludge drying treatment device based on the circulating fluidized bed boiler provided by the present invention without departing from the content of the present invention. Therefore, the protection scope of the present invention should be determined by the content of the attached claims.

Claims

1. A sludge drying treatment method based on a circulating fluidized bed boiler, characterized in that: include, The wet sludge material to be treated is conveyed from the wet sludge hopper to the heat exchange bed of the heat exchange chamber in the fluidized bed sludge dryer through the wet sludge screw conveyor; the moisture content of the wet sludge material to be treated is 50% to 70%; The first flue gas is blown in through the first air distribution plate, so that the wet sludge material enters a suspended state and performs heat exchange with the heat exchange flue gas to form sludge drying particles; wherein the first air distribution plate is arranged under the heat exchange bed, and the first flue gas is blown in from bottom to top; the moisture content of the sludge drying particles is 20% to 40%; The sludge drying particles are transported into a fluidized bed incinerator for combustion to complete the sludge drying process; wherein, the tail flue gas output from the fluidized bed incinerator is transported into the first air distribution plate through the tail gas transport pipeline as the first flue gas by a fluidized fan.

2. The sludge drying treatment method based on a circulating fluidized bed boiler according to claim 1 is characterized in that: After the wet sludge material enters the suspended state, heat exchange flue gas is blown in through the second air distribution plate, so that the wet sludge material in the suspended state enters the rotating suspended state and forms a fluidized sludge suspension layer; wherein the second air distribution plate is arranged on one side of the heat exchange bed, and the heat exchange flue gas is blown in horizontally; the heat exchange flue gas comes from the tail flue gas output by the fluidized bed incinerator.

3. The sludge drying treatment method based on a circulating fluidized bed boiler according to claim 1 is characterized in that: The method of conveying the dried sludge particles into a fluidized bed incinerator for combustion comprises: The dust-containing gas containing the dried sludge particles enters the bag filter from the top of the heat exchange chamber in the fluidized bed sludge dryer through the particle upward air duct to perform gas-solid separation of the dried sludge particles and the gas; The dried sludge particles collected by the bag filter are transported to the fluidized bed incinerator through a dry sludge conveying pipeline by a dry sludge screw conveyor for combustion.

4. The sludge drying treatment method based on a circulating fluidized bed boiler according to claim 3 is characterized in that: A Roots blower is arranged at the air inlet of the dry sludge screw conveyor, and the dry sludge screw conveyor and the Roots blower form a closed conveying system; and the pressure and air volume of the Roots blower are adjusted according to the particle size of the dried sludge particles.

5. The sludge drying treatment method based on a circulating fluidized bed boiler according to claim 1, characterized in that: The step of conveying the dried sludge particles collected by the bag filter to the fluidized bed incinerator through a dry sludge conveying pipeline by a dry sludge screw conveyor for combustion comprises: After the dust cleaning process, the dried sludge particles attached to the surface of the filter bag of the bag filter fall into the ash hopper; The sludge outlet gate valve is opened, and the dried sludge particles enter the dry sludge screw conveyor from the ash hopper through the sludge discharger.

6. The sludge drying treatment method based on a circulating fluidized bed boiler according to claim 3 is characterized in that: After the bag filter performs gas-solid separation, the gas is discharged through a chimney after being desulfurized.

7. The sludge drying treatment method based on a circulating fluidized bed boiler according to claim 1, characterized in that: The dried sludge particles in the fluidized bed incinerator are burned at high temperature in the incineration chamber of the fluidized bed incinerator; wherein the temperature of the incineration chamber of the fluidized bed incinerator is 850°C; The residue produced after high-temperature combustion is discharged using the incinerator slag removal system.

8. The sludge drying treatment method based on a circulating fluidized bed boiler according to claim 1, characterized in that: The temperature of the tail flue gas output by the fluidized bed incinerator is 120°C to 160°C.

9. The sludge drying treatment method based on a circulating fluidized bed boiler according to claim 1, characterized in that: The wet sludge material to be processed is transported to the wet sludge hopper through a wet sludge feeding belt.

10. A sludge drying treatment device based on a circulating fluidized bed boiler, characterized in that: Used to implement the sludge drying treatment method based on a circulating fluidized bed boiler as described in any one of claims 1 to 9; It comprises a sludge drying unit, a sludge conveying unit for conveying wet sludge material to the sludge drying unit, and an incineration unit for incinerating dried sludge particles; The sludge conveying unit comprises a wet sludge hopper and a wet sludge screw conveyor for connecting the wet sludge hopper and the sludge drying unit; The sludge drying unit includes a fluidized bed sludge dryer, which includes a heat exchange bed, a first air distribution plate and a fluidizing fan arranged in a heat exchange chamber; the first air distribution plate is arranged under the heat exchange bed; the fluidizing fan transports the first flue gas blown from bottom to top to the heat exchange bed through the first air distribution plate; The incineration unit comprises a fluidized bed incinerator and an exhaust gas delivery pipeline; the input end of the exhaust gas delivery pipeline is connected to the fluidized bed incinerator, and the output end of the exhaust gas delivery pipeline is connected to the input end of the fluidizing fan.

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