Sludge drying treatment device based on circulating fluidized bed boiler

Abstract

The utility model provides a sludge drying treatment device based on a circulating fluidized bed boiler, which belongs to the technical field of sewage treatment and comprises a sludge drying unit, a sludge conveying unit and an incineration unit. The sludge conveying unit comprises a wet sludge hopper and a wet sludge screw conveyor; the sludge drying unit comprises a fluidized bed sludge dryer and a fluidization fan; the fluidized bed sludge dryer comprises a heat exchange bed and a first air distribution plate which are arranged in a heat exchange chamber; the first air distribution plate is arranged below the heat exchange bed; the fluidization fan conveys 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 a tail gas conveying pipeline; the input end of the tail gas conveying pipeline is communicated with the fluidized bed incinerator, and the output end of the tail gas conveying pipeline is communicated with the input end of the fluidization fan. According to the utility model, the technical effects of high treatment efficiency, low energy consumption and avoidance of secondary pollution can be achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to sewage treatment technical field, specifically, it relates to sludge drying treatment device based on circulating fluidized bed boiler. BACKGROUND

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

[0003] The traditional sludge treatment methods mainly include landfill, incineration, composting and land use, etc. Among them, although the landfill has low cost, it occupies a large amount of land resources, and there is a risk of leakage, which may cause groundwater and soil pollution. Although the incineration can greatly reduce the volume of sludge, the investment and operation cost is high, and harmful gases and ash may be produced. Although the composting can convert sludge into organic fertilizer, the treatment period is long, and the content of heavy metals and pathogens in the product may not meet the safety standards. Although the land use can be used as a soil conditioner, the pollutants in the sludge may enter the food chain, affecting 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 harmful gases, wastewater or solid waste may be produced in the treatment process, causing secondary pollution.

[0004] Therefore, there is an urgent need for a high-efficiency, environmentally friendly and economical sludge drying treatment device based on circulating fluidized bed boiler. CONTENT OF THE UTILITY MODEL

[0005] The utility model aims at providing a sludge drying treatment device based on circulating fluidized bed boiler to solve at least one technical problem existing in the prior art.

[0006] The utility model protects a kind of sludge drying treatment device based on circulating fluidized bed boiler, including sludge drying unit, for the sludge drying unit wet sludge material conveying unit for conveying wet sludge material, and for incinerating sludge drying particle incineration unit;

[0007] The wet sludge conveying unit includes wet sludge hopper and wet sludge screw conveyor for connecting the wet sludge hopper and the sludge drying unit;

[0008] The sludge drying unit includes fluidized bed sludge dryer and fluidized fan;The fluidized bed sludge dryer includes heat exchange bed arranged in heat exchange chamber and first air distribution plate;The first air distribution plate is arranged below the heat exchange bed;The fluidized fan transports first flue gas blown from below to above for the heat exchange bed through the first air distribution plate;Heat preservation layer is arranged on the outer wall of the heat exchange chamber;

[0009] The incineration unit comprises a fluidized bed incinerator and a tail gas conveying pipeline; the input end of the tail gas conveying pipeline is communicated with the fluidized bed incinerator, and the output end of the tail gas conveying pipeline is communicated with the input end of a fluidizing fan.

[0010] Further, preferably, the structure further comprises a second air distribution plate arranged on one side of the heat exchange bed, and the heat exchange flue gas is blown in a horizontal direction through the second air distribution plate; the heat exchange flue gas is tail flue gas output from the fluidized bed incinerator.

[0011] Further, preferably, the structure further comprises a bag filter for gas-solid separation of the sludge drying particles and the gas; the bag filter is arranged at the top of the heat exchange chamber in the fluidized bed sludge dryer; a particle upward air duct is arranged between the heat exchange chamber and the bag filter.

[0012] A dry sludge screw conveyor and a dry sludge conveying pipeline are arranged below the bag filter, and the dry sludge screw conveyor is communicated with the fluidized bed incinerator through the dry sludge conveying pipeline.

[0013] Further, preferably, the structure further comprises a Roots blower, and the dry sludge screw conveyor and the Roots blower form a closed conveying system for conveying the sludge drying particles; the air outlet of the Roots blower is connected with the air inlet of the dry sludge screw conveyor.

[0014] Further, preferably, a hopper for collecting the sludge drying particles adhered to the surface of the filter bag of the bag filter is arranged below the bag filter; a sludge outlet plug valve, a sludge unloader and the dry sludge screw conveyor are sequentially arranged below the hopper.

[0015] Further, preferably, the gas outlet of the bag filter is connected with a desulfurization device, and a chimney is arranged at the gas outlet of the desulfurization device.

[0016] Further, preferably, a residue removal system of the incinerator is arranged on the fluidized bed incinerator for discharging residues generated after high-temperature combustion of the sludge drying particles.

[0017] Further, preferably, the temperature of the tail flue gas output from the fluidized bed incinerator is 120-160°C.

[0018] Further, preferably, a wet sludge feeding belt is arranged above the wet sludge hopper for conveying the wet sludge to be treated.

[0019] Further, preferably, an induced draft fan is arranged between the gas outlet of the bag filter and the desulfurization device.

[0020] As described above, the sludge drying treatment device based on the circulating fluidized bed boiler of the utility model, including sludge drying unit, sludge conveying unit and incineration unit, the sludge conveying unit includes wet sludge hopper and wet sludge screw conveyor, sludge drying unit includes fluidized bed sludge dryer and fluidization fan, the fluidized bed sludge dryer includes heat exchange bed and first cloth air distribution plate arranged in heat exchange chamber, the first cloth air distribution plate is arranged below the heat exchange bed, the fluidization fan transports the first flue gas that blows from below to above for the heat exchange bed through the first cloth air distribution plate, the incineration unit includes fluidized bed incinerator and tail gas conveying pipeline, the input end of the tail gas conveying pipeline is communicated with the fluidized bed incinerator, and the output end of the tail gas conveying pipeline is communicated with the input end of the fluidization fan. The utility model can reach the technical effect that the processing efficiency is high, the energy consumption is low and secondary pollution is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0021] Other objects and results of the utility model will be more apparent and easy to understand by referring to the content of the following description and claims in combination with the drawings and with the more comprehensive understanding of the utility model.

[0022] In the drawings:

[0023] Figure 1 It is the structural schematic diagram of the sludge drying treatment device based on the circulating fluidized bed boiler according to the utility model embodiment.

[0024] Figure 2 It is the flow schematic diagram of the sludge drying treatment device based on the circulating fluidized bed boiler according to the utility model embodiment.

[0025] Wherein: 1, wet sludge incoming belt; 2, wet sludge hopper; 3, wet sludge screw conveyor; 4, fluidized bed sludge dryer; 5, particle upwind channel; 6, bag-type dust collector; 7, sludge outlet plug-in plate valve; 8, sludge unloader; 9, dry sludge screw conveyor; 10, roots blower; 11, material seal pump; 12, dry sludge conveying pipeline; 13, tail gas conveying pipeline; 14, fluidization fan; 15, heat exchange air pipeline; 16, clean air pipeline; 17, induced draft fan; 18, desulfurization equipment. DETAILED DESCRIPTION

[0026] In the following description, for the purpose of providing a comprehensive understanding of one or more embodiments, numerous specific details are set forth. It is apparent, however, to one skilled in the art that the embodiments can be practiced without these specific details. In other instances, well-known structures and devices are shown in block diagram form in order to facilitate a description of one or more embodiments.

[0027] It should be understood that the terms "horizontal", "vertical", "upper", "lower", "top", "middle", "length", "inner", "bottom" and the like are used herein for ease of description to indicate relative positions or locations, and are not intended to indicate or imply specific orientations of the components or elements thereof, or specific orientations of the described technology in use or operation, and therefore should not be taken to limit the described technology to any specific orientation. Thus, the described technology can be used in other orientations than those explicitly implied herein without departing from the basic underlying principles.

[0028] Unless specifically stated otherwise, and as apparent from the previous discussion, it is appreciated that throughout the specification terms such as "mounting", "connection", "connecting", "coupling", "coupled", "fixed", "connecting", "connected", "fixed", "fixedly connected", "electrically connected", "communicatively connected", and the like, refer to a relationship between or among two or more elements, components, or devices, and can encompass the presence of one or more additional elements or components interposed between those coupled elements and / or present along with the coupled elements. Such terminology can also encompass the presence of one or more wires, cables, and / or other physical interconnections that can be at least partially insulative and / or conductive.

[0029] Embodiment 1

[0030] The various embodiments of the present application will be described in detail below with reference to the drawings.

[0031] Figures 1-2 The overall description of the sludge drying treatment device based on the circulating fluidized bed boiler is made. Specifically, Figure 1 is a structural schematic diagram of the sludge drying treatment device based on the circulating fluidized bed boiler according to the embodiment of the present application. Figure 2 is a flow schematic diagram of the sludge drying treatment device based on the circulating fluidized bed boiler according to the embodiment of the present application.

[0032] As Figure 1As shown, the utility model discloses a kind of sludge drying treatment device based on circulating fluidized bed boiler, including sludge drying unit, for the sludge drying unit wet sludge material conveying sludge conveying unit, and for incineration sludge drying particle incineration unit;The sludge conveying unit includes wet sludge hopper 2 and is used to connect the wet sludge hopper 2 and the sludge drying unit wet sludge screw conveyor 3;Wet sludge raw material belt 1 for conveying the wet sludge material to be treated is provided on the wet sludge hopper 2 above.The sludge drying unit includes fluidized bed sludge dryer 4;Fluidized bed sludge dryer includes heat exchange bed being arranged in heat exchange chamber, first air distribution plate and fluidized bed fan 14;The first air distribution plate is arranged below the heat exchange bed;The fluidized bed fan 14 is by the first air distribution plate for the heat exchange bed conveying first flue gas blowing from below to above;Heat preservation layer is provided on the outer wall of the heat exchange chamber;The incineration unit includes fluidized bed incinerator and tail gas conveying pipeline;The input end of the tail gas conveying pipeline 13 is communicated with the fluidized bed incinerator, and the output end of the tail gas conveying pipeline 13 is communicated with the input end of fluidized bed fan.

[0033] When the particle is exposed to wind, the surrounding air flow rate can generate force on the particle, which is called drag force, and its size is related to the windward area of the particle, the flow rate of air and the density of air. The wind from below to above can be decomposed into vertical upward component and transverse component. The vertical upward component helps the particle to rise; that is, the first air distribution plate provides vertical upward lift for the wet sludge material in the heat exchange chamber; so that the wet sludge material becomes wet sludge particles in suspended state. The fluidized bed 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 air cap of the bed bottom air distribution plate, and presents a suspended state. This part of flue gas accounts for about 50% of the total hot flue gas.

[0034] In order to improve the drying efficiency of the fluidized bed sludge dryer 4, a second air distribution plate is further arranged on one side of the heat exchange bed, and the heat exchange flue gas is blown into the heat exchange chamber through the second air distribution plate; the heat exchange flue gas enters the heat exchange chamber through the heat exchange flue gas pipeline 15; the heat exchange flue gas is blown in horizontal direction; the heat exchange flue gas comes from the tail flue gas output by the fluidized bed incinerator. The transverse component can make the particle rotate. The transverse wind can generate lift force on the particle, and if the shape of the particle is asymmetric, the lift force can cause the particle to rotate around its center of gravity. This phenomenon is similar to the working principle of airplane wing. In the fluidized bed sludge dryer 4, the heat exchange flue gas is arranged through horizontal cutting, the motion form of the suspended sludge particles is changed from vertical rising to rotating rising, the tumbling intensity of the sludge particles is increased, and the decomposition and heat exchange of the wet sludge particles are accelerated.

[0035] The sludge drying unit further comprises a bag filter 6 for gas-solid separation of the 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 upwind channel 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 communicated with 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 the dust of larger particles 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 are 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. With the progress of the filtration process, a dust cake is formed 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, at which time dust removal is needed. There are many ways of dust removal, including mechanical shaking, back blowing (reverse airflow), pulse spraying, etc. When dust removal, the filter bag will swell or vibrate rapidly, so that the dust attached to the surface of the filter bag falls off and falls into the ash hopper. The dust collected in the ash hopper can be regularly discharged through gravity, screw conveyor, unloader and other equipment. After filtration and dust removal, the clean gas is discharged from the inside of the filter bag and discharged through the outlet exhaust system. The bag filter is usually equipped with a control system to automatically control the dust removal period, monitor temperature, pressure and other parameters, 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 the boiler flue gas and reduce environmental pollution. The induced draft fan 17 provides the required negative pressure or positive pressure for the system to ensure gas flow.

[0036] In order to further improve the transportation efficiency of the dried sludge particles, the dried sludge screw conveyor 9 and the Roots blower 10 form a closed conveying system for conveying the dried sludge particles; the air outlet of the Roots blower 10 is connected with the air inlet of the dried sludge screw conveyor 9. In some bulk material conveying systems, a screw conveyor may need to be used in conjunction with a Roots blower, especially in a pneumatic conveying system. Pneumatic conveying systems use air flow to convey materials through pipelines to the destination, and Roots blowers can provide the necessary high-pressure air flow for such systems. In this case, the screw conveyor can be used as a component of the pneumatic conveying system to feed the material into the feed inlet 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 mounting hole of the conveyor support plate. Thread the screws of each section of the conveyor, ensuring that they form a straight line after connection. Set up the feed inlet and discharge outlet on site as needed, and make sure to seal the broken welds with sealant to prevent material leakage. Then install the Roots blower: choose a stable foundation to ensure that the blower is stable and reliable after installation. Connect the air inlet and outlet of the blower to the corresponding pipelines. Electrical connections should be completed by a professional electrician, and ensure that the cable connection, power current and frequency meet the design requirements. Install a silencer and damping device to reduce noise and vibration. Relative arrangement of the pneumatic conveying system: ensure that the air outlet of the Roots blower is correctly connected to the air inlet of the screw conveyor to form a closed conveying system. Adjust the pressure and air volume of the blower to adapt to the characteristics of the material and the conveying distance. Ensure that all connections in the entire system have sufficient sealing to prevent air leakage. Before starting the Roots blower, perform a no-load test run to check whether the operation sound and vibration of the blower are normal. Gradually increase the working load of the blower while observing the operation status and temperature of the blower. Debug the conveying system to ensure that the material can be smoothly conveyed to the destination. Ensure that all safety procedures are followed during installation, including wearing appropriate safety equipment. Regularly check the operation of the screw conveyor and the Roots blower, and perform maintenance and repair in a timely manner. After completing the above steps, the screw conveyor and the Roots blower should be able to work together to achieve effective pneumatic conveying.

[0037] A hopper is arranged below the bag filter 6 for collecting the dried sludge particles adhering to the surface of the filter bag of the bag filter; a sludge outlet plug valve 7 is arranged below the hopper; a sludge unloader 8 and the dried sludge screw conveyor 9 are arranged below the hopper. The gas outlet of the bag filter 6 is connected with a desulfurization device 18, and the gas outlet of the desulfurization device 18 is provided with a chimney. A incinerator slag removal system is arranged on the fluidized bed incinerator for discharging the residue generated after high-temperature combustion of the dried sludge particles. The temperature of the tail gas discharged from the fluidized bed incinerator is 120-160℃.

[0038] In general, the wet sludge material enters the wet sludge screw conveyor 3 through the wet sludge material 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 granules by the heat source provided by the fluidizing fan 14 and the tail gas conveying pipeline 13. During the drying process, the uplink air duct 5 of the granules transports dust and hot wet gas to the bag dust collector 6 for dust removal treatment. The clean gas after dust removal is discharged through the clean air pipeline 16, and the dried sludge is transported to the subsequent storage or treatment facility through the sludge unloader 8, the dry sludge screw conveyor 9, the seal pump 11 and other equipment. The Roots blower 10 and the induced draft fan 17 provide the necessary air pressure and air volume in the entire system. As shown in Figure 2 The sludge drying treatment device based on the circulating fluidized bed boiler provided by the utility model is applied to the sludge drying treatment method based on the circulating fluidized bed boiler, and the sludge drying treatment method based on the circulating fluidized bed boiler comprises the following steps: S110, wet sludge material to be treated is transported 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%. The wet sludge material to be treated is transported to the wet sludge hopper through a wet sludge material belt.

[0039] S120, 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 granules; 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 granules is 20% to 40%.

[0040] After the wet sludge material enters the suspended state, a second air distribution plate arranged on one side of the heat exchange bed is further arranged, heat exchange flue gas is blown in through the 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 in the horizontal direction; the heat exchange flue gas is tail flue gas output by the fluidized bed incinerator. The temperature of the tail flue gas output by the fluidized bed incinerator is 120℃ to 160℃.

[0041] S130, the sludge drying granules are transported into the fluidized bed incinerator for combustion, and the sludge drying treatment is completed; wherein the tail flue gas output by the fluidized bed incinerator is sent into an air distribution plate through a tail gas conveying pipeline by a fluidizing fan as first flue gas. The sludge drying granules in the fluidized bed incinerator are subjected to high-temperature combustion in a combustion chamber of the fluidized bed incinerator; wherein the temperature of the combustion chamber of the fluidized bed incinerator is 850℃; and the residue generated after high-temperature combustion is discharged by using an incinerator residue removal system.

[0042] The method for conveying the dried sludge particles into a fluidized bed incinerator for combustion comprises: S131, dust-containing gas containing the dried sludge particles is conveyed from the top of the heat exchange chamber in the fluidized bed sludge dryer into a bag-type dust collector through a particle upward air duct to perform gas-solid separation of the dried sludge particles and the gas; and S132, the dried sludge particles collected by the bag-type dust collector are conveyed into the fluidized bed incinerator for combustion by a dry sludge screw conveyor through a dry sludge conveying pipeline, wherein the dry sludge screw conveyor and a 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.

[0043] The step of conveying the dried sludge particles collected by the bag-type dust collector into the fluidized bed incinerator for combustion by a dry sludge screw conveyor through a dry sludge conveying pipeline comprises: S1321, the dried sludge particles attached to the surface of the filter bag of the bag-type dust collector fall into an ash hopper after being cleaned; and S1322, a sludge outlet plug valve is opened, and the dried sludge particles fall into the dry sludge screw conveyor from the ash hopper through a sludge unloader.

[0044] In summary, the sludge drying treatment device based on a circulating fluidized bed boiler provided by the present application comprises a sludge drying unit, a sludge conveying unit, and a burning unit; the sludge conveying unit comprises a wet sludge hopper and a wet sludge screw conveyor; the sludge drying unit comprises a fluidized bed sludge dryer and a fluidization blower; the fluidized bed sludge dryer comprises a heat exchange bed arranged in a heat exchange chamber and a first air distribution plate; the first air distribution plate is arranged below the heat exchange bed; the fluidization blower conveys first flue gas blown from below to above to the heat exchange bed through the first air distribution plate; the burning unit comprises a fluidized bed incinerator and a tail gas conveying pipeline; the input end of the tail gas conveying pipeline is in communication with the fluidized bed incinerator, and the output end of the tail gas conveying pipeline is in communication with the input end of the fluidization blower. The present application can achieve the technical effects of high treatment efficiency, low energy consumption, and avoidance of secondary pollution.

[0045] However, those skilled in the art should understand that the sludge drying treatment device based on a circulating fluidized bed boiler provided by the present application can be improved in various ways without departing from the content of the present application. Therefore, the protection scope of the present application should be determined by the content of the appended claims.

Claims

1. A sludge drying treatment device based on a circulating fluidized bed boiler, characterized in that, It includes a sludge drying unit, a sludge conveying unit for conveying wet sludge to the sludge drying unit, and an incineration unit for incinerating the dried sludge particles. The sludge conveying unit includes 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 and a fluidizing blower; the fluidized bed sludge dryer includes a heat exchange bed disposed in a heat exchange chamber and a first air distribution plate; the first air distribution plate is disposed below the heat exchange bed; the fluidizing blower delivers first flue gas blown from bottom to top to the heat exchange bed through the first air distribution plate; a heat insulation layer is provided on the outer wall of the heat exchange chamber. The incineration unit includes a fluidized bed incinerator and a tail gas conveying pipeline; the input end of the tail gas conveying pipeline is connected to the fluidized bed incinerator, and the output end of the tail gas conveying pipeline is connected to the input end of the fluidizing blower.

2. The sludge drying treatment device based on a circulating fluidized bed boiler according to claim 1, characterized in that, It also includes a second air distribution plate disposed on one side of the heat exchange bed, through which heat exchange flue gas is blown in horizontally; the heat exchange flue gas comes from the tail flue gas output from the fluidized bed incinerator.

3. The sludge drying treatment device based on a circulating fluidized bed boiler according to claim 1, characterized in that, The sludge drying unit also includes a bag filter for gas-solid separation of sludge drying particles and gas; the bag filter is located at the top of the heat exchange chamber in the fluidized bed sludge dryer; and an upward air duct for particles is provided between the heat exchange chamber and the bag filter. A dry sludge screw conveyor and a dry sludge conveying pipeline are installed below the bag filter. The dry sludge screw conveyor is connected to the fluidized bed incinerator through the dry sludge conveying pipeline.

4. The sludge drying treatment device based on a circulating fluidized bed boiler according to claim 3, characterized in that, A Roots blower is installed 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 for conveying dried sludge particles.

5. The sludge drying treatment device based on a circulating fluidized bed boiler according to claim 3, characterized in that, Below the bag filter is a hopper for collecting dried sludge particles adhering to the surface of the filter bags of the bag filter; below the hopper are a sludge outlet gate valve, a sludge unloader and the dry sludge screw conveyor.

6. The sludge drying treatment device based on a circulating fluidized bed boiler according to claim 3, characterized in that, The gas outlet of the bag filter is connected to the desulfurization equipment, and a chimney is installed at the gas outlet of the desulfurization equipment.

7. The sludge drying treatment device based on a circulating fluidized bed boiler according to claim 1, characterized in that, The fluidized bed incinerator is equipped with an incinerator slag removal system for discharging the residue generated after the high-temperature combustion of dried sludge particles.

8. The sludge drying treatment device based on a circulating fluidized bed boiler according to claim 1, characterized in that, The temperature of the tail gas output from the fluidized bed incinerator is 120℃~160℃.

9. The sludge drying treatment device based on a circulating fluidized bed boiler according to claim 1, characterized in that, A wet sludge conveyor belt is installed above the wet sludge hopper for conveying the wet sludge to be treated.

10. The sludge drying treatment device based on a circulating fluidized bed boiler according to claim 6, characterized in that, An induced draft fan is installed between the gas outlet of the bag filter and the desulfurization equipment.

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