Device for drying sludge using waste incineration waste heat and method of using the same

Abstract

The present invention discloses a device for drying sludge using waste heat from garbage incineration and a method for using the device, and relates to the field of sludge dehydration treatment. The device for drying sludge using waste heat from garbage incineration comprises a garbage incinerator, a dryer, and an air supply mechanism. The device for drying sludge using waste heat from garbage incineration and a method for using the device, by passing the waste incineration flue gas into the dryer for heat exchange with the sludge, allows the sludge to adsorb and fix sulfur-containing substances and suspended particles in the flue gas, and the flue gas re-enters the incineration bin for secondary incineration after separating water vapor. Dioxins in the flue gas are removed by high temperature, achieving the effects of flue gas treatment and heat utilization. At the same time, the moisture content and temperature of multiple sections of sludge inside the dryer are measured, and the particle size and temperature of the sludge after unloading are measured. The dryer speed, flap inclination, inlet air flow temperature, wind speed, and temperature of each section are adjusted according to different situations, thereby achieving intelligent control and regulation to ensure the sludge drying effect and efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of sludge dehydration treatment, and in particular to a device for drying sludge by utilizing waste heat from garbage incineration and a method for using the device. Background Art

[0002] In the sludge process, dehydrating the sludge to achieve volume reduction is the most critical and basic treatment item. Traditional sludge dehydration methods include centrifugation, filter pressing and drying. The former two are mechanical treatment methods. The dehydration process is usually discontinuous and has the problem of low efficiency. In the drying process, a drum dryer is usually used for continuous drying, but it consumes a lot of heat energy and has the highest cost.

[0003] However, the patent publication number CN1654378A discloses a method for drying sludge using waste heat from boiler flue gas. In this method, the boiler flue gas is passed through a sludge dryer after electrostatic dust removal, so that the high-temperature flue gas dries and dehydrates the sludge, which has practical application significance.

[0004] However, the following problems were found in the research:

[0005] 1. During the sludge drying process, the drying and dehydration effects vary significantly due to the influence of temperature, wind speed, stirring speed, and feeding speed. Existing solutions usually use direct flue gas injection, and the stirring speed and feeding speed are not clearly controlled, resulting in the inability to adapt to different types of sludge.

[0006] 2. The main pollutants in combustion flue gas are particulate matter, sulfide and dioxin. Sulfide and particulate matter can be fixed by sludge after contact with sludge, but dioxin is carcinogenic and needs to be removed through high-temperature secondary combustion;

[0007] To this end, a device for drying sludge using waste incineration waste heat and a method for using the device are provided to solve the above problems. Summary of the Invention

[0008] In response to the shortcomings of the existing technology, the present invention provides a device for drying sludge using the waste heat from garbage incineration and a method for using the device, which solves the problem that in the existing sludge drying and dehydration process, flue gas is usually directly introduced, and the stirring speed and feeding speed are not clearly controlled, resulting in the inability to adapt to different types of sludge.

[0009] To achieve the above objectives, the present invention is implemented through the following technical solutions: a device for drying sludge using waste incineration waste heat, comprising a waste incinerator and a dryer installed on top of the waste incinerator, and a control unit, wherein an air supply mechanism is installed between the waste incinerator and the dryer;

[0010] The air supply mechanism includes a main air inlet pipe and an axial flow fan installed between the waste incinerator and the front end of the dryer, through which hot air and cold air are introduced respectively for adjusting the wind speed and wind temperature;

[0011] A water vapor condensation separator is installed between the waste incinerator and the end of the dryer. The water vapor condensation separator is used to separate the water vapor from the air discharged from the dryer and then introduce the exhaust gas back into the waste incinerator for incineration to remove dioxins.

[0012] The drying machine is provided with an adjustable turning assembly inside, and the adjustable turning assembly can change the discharge speed by adjusting the angle;

[0013] The adjustable turning assembly is equipped with a temperature sensor and a humidity sensor for monitoring the moisture content and temperature of the sludge inside the dryer. The control machine adjusts the dryer speed, air intake speed and temperature, and discharge speed according to the monitoring data.

[0014] Preferably, the waste incinerator includes an incineration chamber and a sealed chamber door and an exhaust pipe respectively installed at both ends of the incineration chamber. An air intake fan is fixedly installed on the sealed chamber door to introduce air into the incineration chamber to assist combustion.

[0015] Preferably, the dryer includes an insulation cover arranged on the top of the incineration bin, a drying cylinder is rotatably arranged inside the insulation cover, a feed cover plate and a discharge cover plate are fixedly installed at both ends of the insulation cover, a feed pipe is fixedly installed on the feed cover plate, and a dry mud discharge pipe is fixedly installed at the bottom of the discharge cover plate.

[0016] Preferably, the two ends of the main air inlet pipe are respectively connected to the exhaust pipe and the feed cover plate, a cold air duct is installed between the axial fan and the main air inlet pipe, an electromagnetic flow valve is fixedly installed on the outer surface of the main air inlet pipe near one end of the exhaust pipe, an auxiliary heat inlet pipe is fixedly installed on the outer surface of the main air inlet pipe near one end of the feed cover plate, and the auxiliary heat inlet pipe is connected to the inside of the insulation sleeve.

[0017] Preferably, a variable frequency motor is fixedly installed on the top of one end of the insulation sleeve, a driving gear is fixedly installed on the output end of the variable frequency motor, a passive gear ring is fixed on the outer surface of the end of the drying cylinder, and the driving gear is engaged with the passive gear ring. A plurality of support bearings are installed between the drying cylinder and the insulation sleeve, and auxiliary heating chambers are formed between the plurality of support bearings. Connecting pipes are respectively installed between the auxiliary heating air inlet pipe and the plurality of auxiliary heating chambers, and an electromagnetic control valve is installed on each group of connecting pipes.

[0018] Preferably, an exhaust pipe is installed between the discharge cover plate and the water vapor condensation separator, an air flow return pipe is connected to the other side of the auxiliary heating chamber, the end of the air flow return pipe is connected to the exhaust pipe, and a check valve is installed on the air flow return pipe, a connecting pipe is installed between the water vapor condensation separator and the incineration bin, and a condensed water drain pipe is installed on the outer wall of the water vapor condensation separator.

[0019] Preferably, a base is fixedly welded to the bottom of the insulation cover, and the base is installed on the top of the incineration bin;

[0020] A support seat is fixedly provided at the end of the heat-insulating sleeve, a sealing ring is fixedly provided at the feed end of the drying cylinder, the sealing ring is rotatably provided in the support seat, and the feed cover plate is fixedly provided on the support seat.

[0021] Preferably, the adjustable turning assembly includes a central axis and a fixed axis fixedly welded to the outer wall of the central axis, the fixed axis is fixedly welded to the inner wall of the drying cylinder, the inner wall of the drying cylinder is fixedly provided with a plurality of support parts, a flip plate is rotatably provided on the support part, and the temperature sensor and humidity sensor are fixedly installed on the flip plate.

[0022] Preferably, one end of the fixed shaft is rotatably set in the discharge cover plate, a hydraulic rotating cylinder is fixedly set on the outer wall of the fixed shaft, a rotating shaft is integrally formed in the middle part of the flap, the rotating shaft is fixedly connected to the output end of the hydraulic rotating cylinder, and multiple hydraulic rotating cylinders are controlled and connected to the external driving hydraulic cylinder through oil pipes passing through the fixed shaft and the discharge cover plate.

[0023] Preferably, a method for using a device for drying sludge using waste incineration waste heat comprises the following steps:

[0024] Step 1: The sludge is introduced into the dryer through the feed pipe. At the same time, the incineration bin starts burning and the flue gas is introduced into the dryer;

[0025] Step 2: The dryer is started to stir the sludge, so that the sludge is effectively contacted with the hot air flow to achieve water vaporization and separation;

[0026] Step 3: Measure the moisture content and temperature of the sludge in multiple sections inside the dryer, and measure the particle size and temperature of the sludge after discharge;

[0027] Step 4: According to the moisture content and temperature of each section of sludge and the final sludge particle size and temperature data, adjust the dryer speed, flap inclination, inlet air temperature, wind speed and each section temperature;

[0028] Step 5: The qualified sludge is discharged, and the gas carrying water vapor enters the water vapor condensation separator for steam separation. The separated gas enters the incineration bin for secondary incineration;

[0029] In steps 3 and 4, the moisture content S, S, S...Sn of multiple sections of sludge inside the dryer and the temperatures T, T, T...Tn of multiple sections are measured, as well as the moisture content Sm and particle size D of the sludge after unloading. Then, it is first determined whether Sm is within the threshold. If so, it is determined whether D is within the threshold. If so, no action is taken. If D exceeds the threshold, it means that the overall particle size is large. At this time, the terminal temperature Tn is judged. If Tn is within the threshold, it means that the rotation speed is too high, resulting in excessive sludge flipping during the flipping process, causing agglomeration. At the same time, the front-end temperature is too high, resulting in surface hardening and agglomeration of the sludge in the early stage. At this time, it is necessary to reduce the rotation speed, reduce the proportion of hot air at the front end, and increase the auxiliary heating to ensure the heat in the middle and rear sections. If Tn is not within the threshold, it means that the overall temperature is too high, causing the sludge surface to be too dry and agglomerated. At this time, the overall temperature is too high, and the hot air proportion is reduced while the wind speed is reduced.

[0030] If Sm is not within the threshold, the moisture content of each stage S, S, S…Sn is judged to see if it is within the respective thresholds. If so, it means that the overall moisture content meets the requirements, but the final moisture content does not meet the standard. It is judged that the material is discharged too quickly at the end. At this time, the speed is reduced and the flap angle is adjusted to slow down the material discharge. If the moisture content of each stage is not within the threshold, it means that there is a deviation in the overall dehydration effect. At this time, multiple points T, T, T…Tn are judged to see if they are within their respective thresholds. If the temperatures of multiple points are within the thresholds, it means that the deviation in the overall dehydration effect is not caused by temperature. It is judged that the stirring is too slow, resulting in slow discharge of sludge water vapor. At this time, by increasing the speed and adjusting the flap angle, the sludge stirring frequency is increased without increasing the discharge speed. If the temperatures of multiple points T, T, T…Tn are not within the threshold, it means that the overall heating effect is poor. At this time, by increasing the overall wind speed and temperature, auxiliary heating is performed on each section, and the speed is increased and the flap angle is adjusted, the dehydration effect is improved through comprehensive adjustment.

[0031] The present invention discloses a device for drying sludge using waste heat from garbage incineration and a method for using the device, which has the following beneficial effects:

[0032] 1. The device for drying sludge by utilizing the waste incineration waste heat passes the waste incineration flue gas into the dryer, so that the sludge in the dryer exchanges heat with the flue gas during the stirring process, thereby dehydrating the sludge. At the same time, the sludge can adsorb and fix sulfur-containing substances and suspended particles in the flue gas, and finally the dried sludge is discharged. At the same time, after the flue gas and water vapor are discharged, the water vapor is separated by a water vapor condensation separator, and the flue gas re-enters the incineration chamber for secondary incineration, thereby removing dioxins in the flue gas by high temperature. In this way, while utilizing the heat of waste incineration to dehydrate the sludge, it can effectively adsorb pollutants generated by waste incineration, thereby achieving the effect of flue gas treatment and heat utilization.

[0033] 2. The device for drying sludge using the waste heat from garbage incineration is constructed by modifying the existing dryer, setting an adjustable turning component inside the drying cylinder, and setting multiple auxiliary heating chambers between the drying cylinder and the insulation sleeve. The air supply mechanism is used to supply heat to the auxiliary heating chambers, so that the sludge can be heated in multiple stages through the auxiliary heating chambers during the drying process. At the same time, the angle of the turning plate can be adjusted to change the discharge speed, thereby avoiding the influence of the drying effect on the temperature of the last stage being too low and the discharge being too fast.

[0034] 3. The method of using the device for drying sludge using the waste incineration waste heat is to measure the sludge moisture content and temperature in multiple sections inside the dryer, and measure the particle size and temperature of the sludge after unloading. Based on the actual temperature and humidity data performance inside the drying drum during the drying process and the final unloading situation, a comprehensive analysis is conducted. According to different situations, the dryer speed, flap inclination, inlet air flow temperature, wind speed and temperature of each section are adjusted respectively, thereby realizing intelligent control and adjustment to ensure the sludge drying effect and efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0036] Figure 1 This is a schematic diagram of the overall outer surface structure of the device of the present invention;

[0037] Figure 2 This is a schematic diagram of the overall back structure of the device of the present invention;

[0038] Figure 3 This is a schematic diagram of the overall top structure of the device of the present invention;

[0039] Figure 4 This is a cross-sectional view of the internal structure of the drying machine of the present invention;

[0040] Figure 5 This is a cross-sectional view of the internal structure of the drying drum of the present invention;

[0041] Figure 6 This is a schematic structural diagram of the adjustable turning assembly of the present invention;

[0042] Figure 7 A flow chart of a method for using the device of the present invention;

[0043] Figure 8 This is a judgment logic diagram for executing the method of the present invention.

[0044] In the figure: 1. Waste incinerator; 11. Incineration chamber; 12. Sealed chamber door; 13. Intake fan; 14. Exhaust pipe; 2. Dryer; 21. Insulation cover; 22. Feed pipe; 23. Discharge cover; 24. Drying cylinder; 25. Adjustable turning assembly; 251. Center axis; 252. Fixed axis; 253. Support; 254. Turning plate; 255. Temperature sensor; 256. Humidity sensor; 257. Rotating shaft; 258. Hydraulic rotary cylinder; 26. Support seat; 27. Feed cover; 28. Support Bearing; 29. ​​Frequency conversion motor; 210. Drive gear; 211. Passive gear ring; 212. Dry mud discharge pipe; 213. Base; 214. Sealing ring; 3. Air supply mechanism; 31. Main air inlet pipe; 32. Axial flow fan; 33. Cold air duct; 34. Exhaust pipe; 35. Water vapor condensation separator; 36. Connecting pipe; 37. Condensate discharge pipe; 38. Auxiliary heating air inlet pipe; 39. Air flow return pipe; 310. Connecting pipe; 311. Electromagnetic flow valve; 312. Electromagnetic control valve; 313. Check valve; 4. Control machine. DETAILED DESCRIPTION

[0045] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0046] The embodiments of the present application provide a device for drying sludge using the waste heat from garbage incineration and a method for using the device, thereby solving the problem that in the existing sludge drying and dehydration process, flue gas is usually directly introduced, and the stirring speed and feeding speed are not clearly controlled, resulting in the inability to adapt to different types of sludge.

[0047] In order to better understand the above technical solution, the above technical solution will be described in detail below with reference to the accompanying drawings and specific implementation methods.

[0048] Example 1

[0049] This embodiment discloses a device for drying sludge using waste heat from garbage incineration. Figure 1-8 As shown, it includes a garbage incinerator 1 and a drying machine 2 installed on the top thereof, and also includes a control machine 4. An air supply mechanism 3 is installed between the garbage incinerator 1 and the drying machine 2;

[0050] The air supply mechanism 3 includes a main air inlet duct 31 and an axial flow fan 32 installed between the front end of the waste incinerator 1 and the dryer 2. Hot air and cold air are introduced through the main air inlet duct 31 and the axial flow fan 32 respectively to adjust the wind speed and wind temperature.

[0051] A water vapor condensation separator 35 is installed between the waste incinerator 1 and the end of the dryer 2. The water vapor condensation separator 35 is used to separate the water vapor from the air discharged from the dryer 2 and then re-introduce the exhaust gas into the waste incinerator 1 for incineration to remove dioxins;

[0052] An adjustable turning assembly 25 is provided inside the drying machine 2. The adjustable turning assembly 25 can change the discharge speed by adjusting the angle.

[0053] The adjustable turning assembly 25 is equipped with a temperature sensor 255 and a humidity sensor 256 for monitoring the moisture content and temperature of the sludge inside the dryer 2. The controller 4 adjusts the rotation speed, air intake speed and temperature, and discharge speed of the dryer 2 according to the monitoring data.

[0054] The garbage incinerator 1 includes an incineration chamber 11 and a sealed chamber door 12 and an exhaust pipe 14 respectively installed at both ends of the incineration chamber 11. An air intake fan 13 is fixedly installed on the sealed chamber door 12 for introducing air into the incineration chamber 11 to assist combustion.

[0055] The dryer 2 includes an insulation cover 21 arranged on the top of the incineration bin 11, and a drying cylinder 24 is rotatably arranged inside the insulation cover 21. A feed cover 27 and a discharge cover 23 are fixedly installed at both ends of the insulation cover 21. A feed pipe 22 is fixedly installed on the feed cover 27, and a dry mud discharge pipe 212 is fixedly installed at the bottom of the discharge cover 23.

[0056] The two ends of the main air inlet pipe 31 are respectively connected to the exhaust pipe 14 and the feed cover 27. A cold air duct 33 is installed between the axial fan 32 and the main air inlet pipe 31. An electromagnetic flow valve 311 is fixedly installed on the outer surface of the main air inlet pipe 31 and close to one end of the exhaust pipe 14. An auxiliary heat inlet pipe 38 is fixedly installed on the outer surface of the main air inlet pipe 31 and close to one end of the feed cover 27. The auxiliary heat inlet pipe 38 is connected to the inside of the insulation sleeve 21.

[0057] A variable frequency motor 29 is fixedly installed on the top of one end of the insulation sleeve 21, and a driving gear 210 is fixedly installed on the output end of the variable frequency motor 29. A passive gear ring 211 is fixedly provided on the outer surface of the end of the drying cylinder 24. The driving gear 210 is engaged with the passive gear ring 211. A plurality of support bearings 28 are installed between the drying cylinder 24 and the insulation sleeve 21. Auxiliary heating chambers are formed between the plurality of support bearings 28. Connecting pipes 310 are respectively installed between the auxiliary heating air inlet pipe 38 and the plurality of auxiliary heating chambers, and an electromagnetic control valve 312 is installed on each group of connecting pipes 310.

[0058] An exhaust pipe 34 is installed between the discharge cover plate 23 and the water vapor condensation separator 35. An air flow return pipe 39 is connected to the other side of the auxiliary heating chamber. The end of the air flow return pipe 39 is connected to the exhaust pipe 34, and a check valve 313 is installed on the air flow return pipe 39. A connecting pipe 36 is installed between the water vapor condensation separator 35 and the incineration bin 11, and a condensed water drain pipe 37 is installed on the outer wall of the water vapor condensation separator 35.

[0059] The bottom of the insulation cover 21 is fixedly welded with a base 213, and the base 213 is installed on the top of the incineration chamber 11;

[0060] A support seat 26 is fixedly provided at the end of the insulation sleeve 21 , a sealing ring 214 is fixedly provided at the feed end of the drying cylinder 24 , the sealing ring 214 is rotatably provided in the support seat 26 , and a feed cover plate 27 is fixedly provided on the support seat 26 .

[0061] The adjustable turning assembly 25 includes a central axis 251 and a fixed axis 252 fixedly welded to the outer wall of the central axis 251. The fixed axis 252 is fixedly welded to the inner wall of the drying cylinder 24. The inner wall of the drying cylinder 24 is fixedly provided with a plurality of support parts 253. A flip plate 254 is rotatably provided on the support part 253. The temperature sensor 255 and the humidity sensor 256 are fixedly installed on the flip plate 254.

[0062] One end of the fixed shaft 252 is rotatably set in the discharge cover plate 23, and a hydraulic rotating cylinder 258 is fixedly set on the outer wall of the fixed shaft 252. A rotating shaft 257 is integrally formed in the middle part of the flap 254. The rotating shaft 257 is fixedly connected to the output end of the hydraulic rotating cylinder 258. Multiple hydraulic rotating cylinders 258 are connected to the external drive hydraulic cylinder control through oil pipes passing through the fixed shaft 252 and the discharge cover plate 23.

[0063] Working principle: First, put the garbage into the incineration bin 11 for incineration, and start the air intake fan 13 to accelerate the incineration of the garbage, and the hot gas after incineration enters the drying cylinder 24 through the exhaust pipe 14. In this process, the axial flow fan 32 is used to introduce external air into the main air inlet pipe 31, thereby playing a role in reasonably adjusting the intake air temperature. Then, the sludge is introduced into the drying cylinder 24 from the feed pipe 22, and the frequency conversion motor 29 is started, so that the driving gear 210 drives the passive gear ring 21 1 rotates, causing the drying drum 24 to rotate inside the insulation sleeve 21. At this time, the sludge is blocked by the flap 254 when following the rotation of the drying drum 24. When the sludge rotates to the moving height, the sludge is thrown toward the middle along the flap 254, thereby achieving the sludge stirring, so that the sludge contacts the hot air flow, thereby heating and dehydrating the sludge, and vaporizing the water. At the same time, under the action of the flap 254, the sludge gradually moves toward one end of the discharge cover plate 23 during the continuous stirring process, and is finally discharged through the dry sludge discharge pipe 212;

[0064] The water vapor follows the hot air flow and is discharged from the exhaust pipe 34 at the end into the water vapor condensation separator 35. After the water vapor is separated to form condensed water, the gas enters the incineration chamber 11 again for incineration, so that the dioxins are removed at a second high temperature.

[0065] At the same time, during the above process, when the temperature sensor 255 detects that the temperature of a certain section of the drying drum 24 is lower than the threshold value, the electromagnetic control valve 312 on one side of the section is activated, so that the high-temperature flue gas enters the auxiliary heating chamber corresponding to the section through the auxiliary heating air inlet pipe 38, and the section of the drying drum 24 is auxiliary heated from the outside. After completing the heat exchange, the flue gas enters the exhaust pipe 34 through the air flow return pipe 39, and enters the water vapor condensation separator 35 synchronously with the flue gas discharged from the drying drum 24, thereby realizing multi-stage adaptive auxiliary heating;

[0066] During the rotation of the drying drum 24, the speed is changed by adjusting the power of the variable frequency motor 29, so that the stirring speed of the sludge inside the drying drum 24 is increased; the external driving hydraulic cylinder is connected to the fixed shaft 252 and the discharge cover plate 23 through the oil pipe and the multiple hydraulic rotating cylinders 258, so that in actual use, the hydraulic rotating cylinder 258 drives the flap 254 to rotate, so that the inclination angle of the flap 254 changes. When the speed of the drying drum 24 is constant, the hydraulic rotating cylinder 258 rotates counterclockwise, so that the flap 254 is tilted downward near the end of the dry mud discharge pipe 212, thereby accelerating the sludge discharge speed, and vice versa.

[0067] Example 2

[0068] This embodiment discloses a method for using a device for drying sludge using waste heat from garbage incineration. Figure 1-8 As shown, the following steps are included:

[0069] Step 1: The sludge is introduced into the dryer 2 through the feed pipe 22, and at the same time, the incineration bin 11 starts to burn and the flue gas is introduced into the dryer 2;

[0070] Step 2: The dryer 2 is started to stir the sludge, so that the sludge is effectively contacted with the hot air flow to achieve water vaporization and separation;

[0071] Step 3: Measure the sludge moisture content and temperature in multiple sections inside the dryer 2, and measure the particle size and temperature of the sludge after discharge;

[0072] Step 4: Adjust the rotation speed of the dryer 2, the inclination angle of the flap 254, the temperature of the inlet air flow, the wind speed, and the temperature of each section according to the water content and temperature of each section of sludge and the final sludge particle size and temperature data;

[0073] Step 5: The qualified sludge is discharged, and the gas carrying water vapor enters the water vapor condensation separator 35 for steam separation, and the separated gas enters the incineration bin 11 for secondary incineration;

[0074] During the drying process, by increasing the wind speed, the drying speed is increased, and the water vapor discharge efficiency is increased, which can effectively avoid the secondary adsorption of water vapor with the sludge at the end, resulting in the final discharge of compost sludge moisture content not meeting the standard. However, too fast a wind speed will cause the front end sludge surface to dry quickly, which is not conducive to the discharge of water vapor inside the sludge, and the overall energy consumption increases; by increasing the temperature, the water in the sludge can be quickly evaporated to form water vapor. However, since the entire drying cylinder 24 is long, the high temperature in the front section will cause the sludge to harden quickly on the surface in the front section, thereby causing the sludge to solidify. The internal water vapor of the block cannot be discharged. During the sludge stirring process, the rotation speed is appropriately increased to increase the stirring frequency, so that the sludge contacts the hot air flow more frequently, thereby accelerating the dehydration. However, if the rotation speed is too fast, centrifugal force will be generated, causing the sludge to adhere to the inner wall, making it difficult to discharge the sludge. During the stirring process, the inclination angle of the flap 254 is appropriately increased to speed up the sludge discharge and improve the efficiency. However, if the discharge is too fast, the sludge dehydration rate will not meet the requirements. In order to comprehensively consider the above situation, various conditions affecting sludge dehydration are comprehensively adjusted in this plan.

[0075] By measuring the moisture content S1, S2, S3...Sn of the sludge in multiple sections inside the dryer 2; the sludge temperature T1, T2, T3...Tn of the multiple sections; and the moisture content Sm and particle size D of the sludge after feeding; then first determine whether Sm is within the threshold. If so, then determine whether D is within the threshold. If so, it means that the overall dehydration rate meets the requirements, and the temperature and speed during the dehydration process meet the standards, and the sludge does not agglomerate, then no action is taken;

[0076] If D exceeds the threshold, it means that the overall particle size is large; at this time, the terminal temperature Tn is judged. If Tn is within the threshold, it means that the terminal temperature is appropriate, but the sludge still agglomerates. At this time, it is considered that the rotation speed of the drying drum 24 is too high, resulting in excessive stirring of the sludge during the stirring process, resulting in agglomeration. At the same time, the front-end temperature is too high, resulting in surface hardening and agglomeration of the sludge in the early stage; at this time, it is necessary to reduce the rotation speed of the drying drum 24, and at the same time, by adjusting the electromagnetic flow valve 311 and the axial flow fan 32, reduce the proportion of hot air intake at the front end, and at the same time, by opening the multi-stage electromagnetic control valve 312, allow the auxiliary hot air flow to pass through the auxiliary heat intake pipe 38 into the multi-stage auxiliary heat chamber, thereby enhancing auxiliary heating and ensuring heat in the middle and rear stages;

[0077] If Tn is not within the threshold, it means that the terminal discharge temperature is too high. At this time, the overall temperature is too high, causing the sludge surface to become too dry and agglomerated. By reducing the proportion of hot air and the wind speed, the sludge can be prevented from being overheated and agglomerated.

[0078] The above are adjustments made to the entire device to avoid sludge agglomeration when the overall sludge dehydration rate meets the requirements.

[0079] If Sm is not within the threshold, the moisture content of each stage S1, S2, S3...Sn is judged to see if it is within the respective thresholds. If so, it means that the overall moisture content meets the requirements, but the final moisture content does not meet the standards. It is judged that the end of the material is discharged too quickly. In this case, the speed of the drying drum 24 is reduced and the angle of the flap 254 is adjusted to slow down the material discharge, so that the sludge can have more drying time at each stage.

[0080] If the moisture content at each stage is not within the threshold, it indicates that there is a deviation in the overall dehydration effect. At this time, multiple points T1, T2, T3...Tn are judged to be within their respective thresholds. If the temperature at multiple points is within the threshold, it indicates that the reason for the deviation in the overall dehydration effect is not temperature. In this case, it is judged that the stirring is too slow, resulting in slow discharge of sludge water vapor. At this time, by increasing the rotation speed and adjusting the angle of the flap 254, the sludge can be stirred more frequently without increasing the discharge speed.

[0081] If the temperatures at multiple points, such as T1, T2, T3...Tn, are not within the threshold, it indicates that the overall heating effect is poor. In this case, the overall wind speed and temperature are increased, auxiliary heating is performed on each section, the rotation speed is increased, and the angle of the flap 254 is adjusted. Through comprehensive adjustments, the dehydration effect can be improved.

[0082] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for drying sludge using waste incineration waste heat, comprising a waste incinerator (1) and a drying machine (2) mounted on top thereof, and also comprising a control machine (4), characterized in that: An air supply mechanism (3) is installed between the garbage incinerator (1) and the drying machine (2); The air supply mechanism (3) comprises a main air inlet pipe (31) and an axial flow fan (32) installed between the front end of the waste incinerator (1) and the dryer (2), and hot air and cold air are respectively introduced through the main air inlet pipe (31) and the axial flow fan (32) to adjust the wind speed and wind temperature; A water vapor condensation separator (35) is installed between the ends of the waste incinerator (1) and the dryer (2). The water vapor condensation separator (35) is used to separate the water vapor from the air discharged from the dryer (2) and then introduce the exhaust gas back into the waste incinerator (1) for incineration to remove dioxins. An adjustable material turning component (25) is provided inside the drying machine (2), and the adjustable material turning component (25) changes the discharge speed by adjusting the angle; The adjustable turning assembly (25) is equipped with a temperature sensor (255) and a humidity sensor (256) for monitoring the water content and temperature of the sludge inside the dryer (2). The control unit (4) adjusts the rotation speed, air intake speed and temperature, and discharge speed of the dryer (2) according to the monitoring data. The waste incinerator (1) comprises an incineration chamber (11) and a sealed chamber door (12) and an exhaust pipe (14) respectively installed at both ends of the incineration chamber (11); an air intake fan (13) is fixedly installed on the sealed chamber door (12) for introducing air into the incineration chamber (11) to assist combustion; The drying machine (2) comprises a heat-insulating sleeve (21) arranged on the top of the incineration bin (11), a drying cylinder (24) is rotatably arranged inside the heat-insulating sleeve (21), a feed cover plate (27) and a discharge cover plate (23) are fixedly mounted on both ends of the heat-insulating sleeve (21), a feed pipe (22) is fixedly mounted on the feed cover plate (27), and a dry mud discharge pipe (212) is fixedly mounted on the bottom of the discharge cover plate (23).

2. The device for drying sludge using waste incineration waste heat according to claim 1, characterized in that: The two ends of the main air inlet pipe (31) are respectively connected to the exhaust pipe (14) and the feed cover plate (27); a cold air duct (33) is installed between the axial flow fan (32) and the main air inlet pipe (31); an electromagnetic flow valve (311) is fixedly installed on the outer surface of the main air inlet pipe (31) and at one end close to the exhaust pipe (14); an auxiliary heat inlet pipe (38) is fixedly installed on the outer surface of the main air inlet pipe (31) and at one end close to the feed cover plate (27); the auxiliary heat inlet pipe (38) is connected to the interior of the insulation sleeve (21).

3. The device for drying sludge using waste incineration waste heat according to claim 2, characterized in that: A variable frequency motor (29) is fixedly mounted on the top of one end of the thermal insulation sleeve (21), a driving gear (210) is fixedly mounted on the output end of the variable frequency motor (29), a passive gear ring (211) is fixedly mounted on the outer surface of the end of the drying cylinder (24), the driving gear (210) is meshed with the passive gear ring (211), a plurality of support bearings (28) are mounted between the drying cylinder (24) and the thermal insulation sleeve (21), auxiliary heating chambers are formed between the plurality of support bearings (28), connecting pipes (310) are respectively mounted between the auxiliary heating air inlet pipe (38) and the plurality of auxiliary heating chambers, and an electromagnetic control valve (312) is mounted on each group of connecting pipes (310).

4. The device for drying sludge using waste incineration waste heat according to claim 3, characterized in that: An exhaust pipe (34) is installed between the discharge cover plate (23) and the water vapor condensation separator (35), and an air flow return pipe (39) is connected to the other side of the auxiliary heating chamber. The end of the air flow return pipe (39) is connected to the exhaust pipe (34), and a check valve (313) is installed on the air flow return pipe (39). A connecting pipe (36) is installed between the water vapor condensation separator (35) and the incineration bin (11), and a condensed water discharge pipe (37) is installed on the outer wall of the water vapor condensation separator (35).

5. The device for drying sludge using waste incineration waste heat according to claim 1, characterized in that: A base (213) is fixedly welded to the bottom of the thermal insulation sleeve (21), and the base (213) is installed on the top of the incineration bin (11); A support seat (26) is fixedly provided at the end of the heat-insulating sleeve (21), a sealing ring (214) is fixedly provided at the feed end of the drying cylinder (24), the sealing ring (214) is rotatably provided in the support seat (26), and the feed cover plate (27) is fixedly provided on the support seat (26).

6. The device for drying sludge using waste incineration waste heat according to claim 1, characterized in that: The adjustable turning assembly (25) comprises a central shaft (251) and a fixed shaft (252) fixedly welded to the outer wall of the central shaft (251); the fixed shaft (252) is fixedly welded to the inner wall of the drying cylinder (24); a plurality of supporting parts (253) are fixedly provided on the inner wall of the drying cylinder (24); a turning plate (254) is rotatably provided on the supporting part (253); and the temperature sensor (255) and the humidity sensor (256) are fixedly mounted on the turning plate (254).

7. The device for drying sludge using waste incineration waste heat according to claim 6, characterized in that: One end of the fixed shaft (252) is rotatably arranged in the discharge cover plate (23); a hydraulic rotary oil cylinder (258) is fixedly arranged on the outer wall of the fixed shaft (252); a rotating shaft (257) is integrally formed in the middle of the flap (254); the rotating shaft (257) is fixedly connected to the output end of the hydraulic rotary oil cylinder (258); and a plurality of the hydraulic rotary oil cylinders (258) are connected to the external driving hydraulic cylinder control via oil pipes penetrating the fixed shaft (252) and the discharge cover plate (23).

8. A method for using the device for drying sludge using waste incineration waste heat according to any one of claims 1 to 7, characterized in that: The following steps are included: Step 1: The sludge is introduced into the dryer (2) through the feed pipe (22), and at the same time, the incineration chamber (11) starts to burn and the flue gas is introduced into the dryer (2); Step 2: The dryer (2) is started to stir the sludge, so that the sludge is effectively contacted with the hot air flow to achieve water vaporization and separation; Step 3: Measure the moisture content and temperature of the sludge in multiple sections inside the dryer (2), and measure the particle size and temperature of the sludge after discharge; Step 4: According to the water content and temperature of each section of sludge and the final sludge particle size and temperature data, the rotation speed of the dryer (2), the inclination angle of the flap (254), the temperature of the inlet air flow, the wind speed and the temperature of each section are adjusted respectively; Step 5: The qualified sludge is discharged, and the gas carrying water vapor enters the water vapor condensation separator (35) for steam separation, and the separated gas enters the incineration bin (11) for secondary incineration; In steps 3 and 4, the moisture content S1, S2, S3, ... Sn of the sludge in multiple sections inside the dryer, the temperatures T1, T2, T3, ... Tn of the sludge in multiple sections, and the moisture content Sm and particle size D of the sludge after feeding are measured. Then, it is first determined whether Sm is within the threshold. If so, it is determined whether D is within the threshold. If so, no action is taken. If D exceeds the threshold, the terminal temperature Tn is determined. If Tn is within the threshold, the rotation speed is reduced, and the proportion of hot air from the front air intake is reduced to enhance auxiliary heating. If Tn is not within the threshold, the proportion of hot air is reduced, and the wind speed is reduced. If Sm is not within the threshold, the moisture content of each stage S1, S2, S3…Sn is judged to see if it is within the respective thresholds. If so, the rotation speed is reduced and the flap angle is adjusted to slow down the feeding. If the moisture content in each stage is not within the threshold, the system will judge whether multiple points T1, T2, T3...Tn are within their respective thresholds. If the temperature at multiple points is within the threshold, the rotation speed will be increased and the flap angle will be adjusted at the same time. If the temperature at multiple points T1, T2, T3...Tn is not within the threshold, the overall wind speed and temperature will be increased, and auxiliary heating will be performed on each section. The rotation speed will be increased and the flap angle will be adjusted at the same time.

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