Sludge drying and resource utilization system adopting brick-making tunnel kiln waste heat and application

Abstract

The invention discloses a sludge drying and resource utilization system adopting waste heat of a brickmaking tunnel kiln and application. The sludge drying and resource utilization system comprises a sludge drying and brickmaking module, a drying flue gas treatment module and a sewage treatment module. The sludge drying brick making module comprises a sludge conveying unit, a sludge dryer, a dry sludge conveyor, a green brick making unit and a tunnel kiln unit; the drying flue gas treatment module comprises a flue gas cooling device, a flue gas biological deodorization unit and an incineration flue gas bypass; an inlet of the sludge dryer is connected with the sludge conveying unit; an outlet of the sludge dryer is connected with a brick inlet of the tunnel kiln unit through a dry sludge conveyor and a green brick manufacturing unit in sequence; a flue gas inlet of the sludge dryer is connected with a hot flue gas outlet of the tunnel kiln unit through an air feeder; a flue gas outlet of the sludge drying machine is connected with the flue gas cooling device through a moisture removal fan; the method solves the technical problems of high energy consumption and environmental pollution of sludge harmless treatment.

Description

Technical Field

[0001] The present invention relates to the technical field of solid waste treatment, and more specifically, to a sludge drying and resource utilization system and application thereof using waste heat from a brick-making tunnel kiln. Background Art

[0002] Municipal sludge is a byproduct of municipal sewage treatment. Generally, after sufficient filtration in the sewage treatment plant, the water content can be reduced to 80%. According to the urban construction department and related sludge yield survey data, about 8 tons of sludge with a water content of 80% is produced for every 10,000 tons of sewage treated. According to the "2023 China Ecological Environment Bulletin" released by the Ministry of Ecology and Environment in June 2024, preliminary calculations show that the treatment capacity of urban sewage treatment plants across the country in 2023 will be 224 million m 3 / day, the total amount of sewage treated is 64.1 billion m 3 / year. Based on this data, according to the sludge production rate of 0.8%, the national sludge with a water content of 80% produces about 170,000 tons of sludge per day, and more than 50 million tons of sludge per year.

[0003] With the rapid development of social economy and the continuous improvement of urbanization level, the discharge of industrial and domestic sewage is increasing, and the sludge output of sewage treatment plants is increasing. However, due to the high water content in sludge, the high content of organic matter in it is parasitic on various bacteria, viruses and parasites. At the same time, the sludge also concentrates heavy metal compounds such as zinc, copper, lead and tin, as well as toxic compounds, pesticides, etc. The complex and variable structure of sludge determines that it is difficult to treat it efficiently.

[0004] Affected by the long-term emphasis on water and neglect of sludge, China's sludge treatment industry started relatively late. Most of the earlier sewage treatment plants in my country do not have a complete sludge treatment system. Although the newly built large-scale sewage treatment plants generally have relatively complete sludge treatment processes, there are not many sewage treatment plants that are truly fully operational and in good operating condition. Most sewage plant sludge is disposed of by a third party in exchange for payment of sludge treatment fees.

[0005] Common process routes for sludge treatment include drying and incineration, anaerobic fermentation, and sanitary landfill.

[0006] In the aspect of sludge drying and incineration, phase change drying technology is generally used, the moisture content can be reduced from 80% to 50%-60%, and the calorific value is greatly improved, thus achieving efficient sludge incineration. However, the application of drying incineration is limited due to the high energy consumption of the incineration process.

[0007] In terms of anaerobic fermentation of sludge, the technology is relatively mature. Generally, anaerobic fermentation plants are built close to sewage treatment plants. The biogas slurry from anaerobic fermentation plants can be returned to sewage treatment plants for treatment or further aerobic composting for use. The problem with anaerobic fermentation in my country is that the sludge in the secondary sedimentation tank contains too much sand and slag. During the anaerobic fermentation process, these sand and slag are deposited at the bottom of the pipes and fermentation tanks, seriously blocking the pipes.

[0008] In terms of sanitary landfill of sludge, the construction period of sludge landfill is short, the investment is relatively low, it can be invested in stages, it is easy to manage, and the on-site operation is relatively simple. The sludge in the landfill degrades quickly and can be mined and utilized after several years. The freed space can be used to re-landfill fresh sludge. However, with the development of cities, land resources are becoming increasingly scarce. Therefore, landfills should be regarded as reactors and transfer stations for sludge treatment, rather than the final destination.

[0009] Since the main components of sludge include Fe 2 O 3 、Al 2 O 3 、SiO 2 , Cao, MgO and other clay materials, whose properties are similar to clay for brick making, with heat resistance, plasticity, sintering properties, and the ash, aluminum salt and iron salt in the sludge are coagulant components. The sludge is harmlessly treated during high-temperature roasting, and the sludge contains a certain amount of exothermic organic matter that can provide heat for roasting. In addition, a large amount of high-temperature flue gas is generated during the brick-making process, which can become a heat source for sludge drying, reducing a certain amount of energy consumption, realizing the resource utilization of waste treatment, meeting the requirements of industrial production, and saving arable land clay resources.

[0010] Since the amount of sludge generated is huge and relatively scattered, in sludge treatment technology, if we can make full use of surrounding resources and facilities and adapt to local conditions, we should consider making full use of waste heat and other resources to achieve harmless treatment of sludge while reducing sludge treatment energy consumption and cost, and consider sludge resource utilization and reduction to achieve environmentally friendly sludge treatment. Summary of the invention

[0011] In response to the needs of the above-mentioned existing sludge treatment technologies, the present invention provides a sludge drying and resource utilization system and application that utilizes the waste heat of a brick-making tunnel kiln. The sludge system solves the technical problems of high energy consumption and environmental pollution in the harmless disposal of sludge, while at the same time realizing the resource utilization of sludge by using the dried sludge as raw material for brick making.

[0012] To achieve the above object, the present invention is implemented through the following technical solutions:

[0013] A sludge drying and resource utilization system using waste heat from a brick-making tunnel kiln, the sludge drying and resource utilization system comprising a sludge drying brick-making module, a drying fume treatment module and a sewage treatment module; the sludge drying brick-making module comprises a sludge conveying unit, a sludge dryer, a dry sludge conveyor, a brick-making unit and a tunnel kiln unit consisting of a preheating area, a high-temperature area and a cooling area; the drying fume treatment module comprises a fume cooling device, a fume biological deodorization unit and an incineration fume bypass; wherein:

[0014] The inlet of the sludge dryer is connected to the sludge conveying unit; the outlet of the sludge dryer is connected to the brick inlet of the tunnel kiln unit through the dry sludge conveyor and the brick making unit in sequence; the smoke inlet of the sludge dryer is connected to the hot smoke outlet of the tunnel kiln unit through the blower; the smoke outlet of the sludge dryer is connected to the high temperature area of ​​the tunnel kiln unit through the incineration smoke bypass after the dehumidification fan; the smoke outlet of the sludge dryer is connected to the smoke cooling device through another smoke after the dehumidification fan; wherein:

[0015] One path of the smoke outlet of the smoke cooling device is connected to the high temperature area of ​​the tunnel kiln unit through a smoke biological deodorization unit and a deodorization exhaust point with a valve;

[0016] Another route of the smoke outlet of the smoke cooling device is connected to the cooling area of ​​the tunnel kiln unit through a smoke biological deodorization unit and a cold air valve.

[0017] Furthermore, the sludge conveying unit includes a sludge storage bin, an extruder and a wet sludge conveyor; the extruder is located at the bottom of the sludge storage bin, the wet sludge conveyor inlet is connected to the extruder sludge outlet, the wet sludge conveyor outlet is connected to the sludge inlet of the sludge dryer, and the sludge outlet of the sludge dryer is connected to the dry sludge conveyor inlet.

[0018] Furthermore, the sludge dryer is a belt structure, which has 3 to 7 layers of horizontally arranged mesh belts inside, and each layer of the mesh belt is connected to an electric transmission module with variable frequency speed regulation; the mesh belt consists of two layers, the bottom mesh belt is made of stainless steel wire mesh, and the Teflon non-stick mesh is used in contact with the material; wherein:

[0019] The hot air required for drying the sludge is sent in from the bottom of the sludge dryer through the hot air blower. After penetrating the horizontally moving mesh belt and the sludge laid on the mesh belt layer by layer from bottom to top, the temperature is reduced and the water evaporated from the sludge is carried through the dehumidification fan from the upper side of the sludge dryer and sent into the drying flue gas treatment system.

[0020] Furthermore, the sludge conveying unit is connected to the sewage treatment module through a drain port; the flue gas cooling device is connected to the sewage treatment module through a drain port; wherein:

[0021] The flue gas cooling device reduces the flue gas temperature to 40-60°C, thereby condensing the water vapor with pungent odor carried from the sludge dryer in the flue gas, and the condensed water is discharged into the sewage treatment system for treatment. The cooled flue gas enters the flue gas biological deodorization system for further purification.

[0022] In order to solve the problems of the prior art, the present invention also adopts the following technical solution, comprising the following steps:

[0023] The wet sludge is stored in the sludge storage bin, and the sludge is squeezed into strips by the extruder at the bottom of the sludge storage bin, and then sent to the feeding end of the sludge dryer through the wet sludge conveyor;

[0024] The moisture content of the wet sludge after hot air drying inside the belt dryer is transferred from the end of the bottom mesh belt of the sludge dryer to the dry sludge conveyor and then transported to the brick making system;

[0025] Air is taken from the high temperature area of ​​the tunnel kiln unit and sent to the belt sludge dryer through the hot air blower. The hot air heats the sludge inside the sludge dryer to reduce the temperature to 110℃~140℃ and the wet flue gas is discharged. When the wet sludge is heated by the flue gas, its moisture evaporates in the form of water vapor and enters the flue gas and is discharged with the flue gas through the dehumidification fan;

[0026] The 110℃~140℃ wet flue gas from the dehumidification fan is cooled to 40~60℃ by the flue gas cooling device, and the wastewater is discharged into the wastewater treatment module for further treatment; the 40~60℃ flue gas is further deodorized by the biological deodorization unit and then introduced into the cooling area of ​​the tunnel kiln to form a closed cycle;

[0027] in:

[0028] Introduce part of the wet flue gas at 110℃~140℃ into the high temperature area of ​​the tunnel kiln for direct incineration.

[0029] And introduce the exhaust point of the biological deodorization unit into the high-temperature area of ​​the tunnel kiln for direct incineration treatment.

[0030] Beneficial Effects

[0031] The beneficial effects of this utility model compared with the prior art are:

[0032] 1. The present invention provides a sludge drying and resource utilization system using the waste heat of a brick-making tunnel kiln, which can achieve sludge drying treatment and resource utilization. The sludge drying and resource utilization system includes a sludge drying system, a drying flue gas treatment system, a tunnel kiln system, a brick production system, and a sewage treatment system. The belt sludge dryer in the sludge drying system can reduce the sludge water content to 30-40% by using the 300-400°C waste heat of the brick-making tunnel kiln, and the dried sludge is used as a raw material for brick making to achieve resource utilization; the drying flue gas treatment system eliminates the factory odor after the wet flue gas carrying sludge moisture is treated by flue gas cooling, biological deodorization, and high-temperature incineration; the present invention not only utilizes the flue gas waste heat of the tunnel kiln for harmless treatment of sludge, but also overcomes the odor generated by the sludge treatment, and realizes the resource utilization of sludge.

[0033] 2. The present invention uses the waste heat of the brick-making tunnel kiln to dry the sludge, avoiding the consumption of fossil energy such as natural gas required by the sludge drying technology route, making full use of waste heat resources to achieve large-scale drying of sludge, and has a good energy-saving effect; at the same time, the dried sludge can be used as a raw material for brick making for resource utilization, reducing the consumption of cultivated clay, and having a good resource utilization effect. The system is equipped with a complete flue gas purification and sewage treatment system, which can achieve sludge treatment without secondary pollution and has a good environmental protection effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a schematic diagram of a sludge drying and resource utilization system using waste heat from a brick-making tunnel kiln of the present invention. The following are marked: 101-sludge drying brick-making module, 201-drying flue gas treatment module, 301-sewage treatment module, 110-sludge conveying unit, 1-sludge storage bin, 2-strip extruder, 3-wet sludge conveyor, 4-belt sludge dryer, 5-dry sludge conveyor, 6-brick blank making unit, 7-brick-making tunnel kiln unit, 7-1 brick inlet, 7-2 preheating area, 7-3 high temperature area and 7-4 cooling area, 7-5 brick outlet; 8-hot air blower, 9-humidity exhaust fan, 10-flue gas cooling device, 12-flue gas biological deodorization unit, 13-cold flue gas valve, 14-deodorization exhaust point valve, 15-incineration flue gas bypass, 151 flue gas valve. DETAILED DESCRIPTION

[0035] The following is combined with Figure 1 The present invention is further described.

[0036] A sludge drying and resource utilization system using waste heat from a brick-making tunnel kiln, the sludge drying and resource utilization system comprising a sludge drying brick-making module 101, a drying fume treatment module 201 and a sewage treatment module 301; the sludge drying brick-making module 101 comprises a sludge conveying unit 110, a sludge dryer 4, a dry sludge conveyor 5, a brick blank making unit 6 and a tunnel kiln unit 7 comprising a brick inlet 7-1, a preheating area 7-2, a high temperature area 7-3 and a cooling area 7-4, and a brick outlet 7-5; the drying fume treatment module 201 comprises a fume cooling device 10, a fume biological deodorization unit 12 and an incineration fume bypass 15; wherein:

[0037] The inlet of the sludge dryer 4 is connected to the sludge conveying unit 110; the outlet of the sludge dryer 4 is connected to the brick inlet 7-1 of the tunnel kiln unit 7 through the dry sludge conveyor 5 and the brick making unit 6 in sequence; the smoke inlet of the sludge dryer 4 is connected to the hot smoke outlet of the tunnel kiln unit 7 through the blower 8; the smoke outlet of the sludge dryer 4 is connected to the smoke cooling device 10 through the dehumidification fan 9; wherein: the smoke cooling device 10 is connected to the high temperature area 7-2 of the tunnel kiln unit 7 through the incineration smoke bypass 15 and the smoke valve 151 in sequence;

[0038] The flue gas cooling device 10 is connected to the high temperature area 7-3 of the tunnel kiln unit 7 through the flue gas biological deodorization unit 12 and the exhaust point valve 14 in sequence; the flue gas cooling device 10 is connected to the cooling area 7-4 of the tunnel kiln unit 7 through the cold air valve 13; wherein:

[0039] The sludge extruder 2 of the sludge conveying unit 110 is located at the bottom of the sludge storage bin 1, the inlet of the wet sludge conveyor 3 is connected to the sludge outlet of the sludge extruder 2, the outlet of the wet sludge conveyor 3 is connected to the sludge inlet of the belt sludge dryer 4, and the sludge outlet of the belt sludge dryer 4 is connected to the inlet of the dry sludge conveyor 5. The smoke and air inlet of the belt sludge dryer 4 is connected to the outlet pipe of the hot air blower 8, and the smoke and air outlet pipe of the belt sludge dryer 4 is connected to the drying smoke treatment module 201 through the dehumidification fan 9. The sewage outlet of the extruder 2 is connected to the sewage treatment system 301 through a pipeline.

[0040] The inlet of the flue gas cooling device 10 of the drying flue gas treatment module 201 is connected to the outlet flue of the dehumidification fan 9, and the flue gas outlet pipe of the flue gas cooling device 10 is connected to the inlet flue of the flue gas biological deodorization unit 12. The outlet flue of the flue gas biological deodorization unit 12 is connected to the cooling area 7-4 of the tunnel kiln 7 through a cold flue gas valve. An incineration flue gas bypass 15 is provided between the outlet flue of the dehumidification fan 9 and the inlet pipe of the flue gas cooling device 10 to lead to the flue to the high temperature area 7-3 of the tunnel kiln 7 for high temperature incineration and deodorization, and the incineration flue gas bypass 15 pipe is provided with a valve 151. A deodorization exhaust valve 14 is provided in the flue gas biological deodorization unit 12 and the pipe is led to the high temperature area 7-3 of the tunnel kiln 7 for high temperature incineration and deodorization, and the deodorization exhaust pipe is provided with a deodorization exhaust point valve 14. The flue gas cooling device 10 is connected to the sewage treatment module 301 through a drain outlet and a pipe.

[0041] A brick making unit 6 is provided between the sludge drying brick making module 101 and the tunnel kiln unit 7. The dry sludge conveyor 5 conveys the sludge dried by the belt sludge dryer 4 to the brick making unit 6. By using the dried sludge to replace part of the clay, the bricks made of sludge as raw material enter the tunnel kiln system 7 from the brick inlet 7-1 for baking, thereby realizing the resource utilization of sludge. Among them: the extruder 2 is located at the bottom of the sludge storage bin 1, and the wet sludge with a water content of about 80% is squeezed into strips and then sent to the inlet of the belt sludge dryer 4 through the wet sludge conveyor 3. Because the water content of the wet sludge is reduced by squeezing the extruder 2, a drainage port is provided at the bottom of the extruder 2, and the sewage squeezed from the wet sludge is discharged to the sewage treatment module 301 through the drainage port.

[0042] The sludge dryer 4 is a belt structure, with 3 to 7 layers of horizontally arranged drying mesh belts arranged inside, each layer of mesh belt is equipped with an electric transmission module with variable frequency speed regulation, and the mesh belt is made of stainless steel and Teflon materials; a wet sludge inlet is arranged at the upper left part, and due to the horizontal movement of the mesh belt, the sludge is evenly spread on the mesh belt, and flows to the lower layer of the drying mesh belt moving in the opposite direction as the drying mesh belt moves to the end; the 300-400°C drying hot air required by the sludge dryer 4 is introduced from the bottom through the hot air blower 8, and after penetrating the horizontally moving mesh belt and the sludge laid on the mesh belt layer by layer from bottom to top, the temperature is reduced to 110-130°C, and the water evaporated in the sludge is carried from the upper side of the dryer 4 through the dehumidification fan 9 and sent to the drying flue gas treatment module 201; the moisture content of the sludge after hot air drying is reduced to 30%-40%, and it flows from the end of the lowest mesh belt to the dry sludge conveyor 5.

[0043] The tunnel kiln unit 7 comprises a brick inlet 7-1, a preheating area 7-2, a high temperature area 7-3, a cooling area 7-4, a brick outlet 7-5 and auxiliary facilities. The highest temperature of the high temperature area 7-3 can reach 1000-1100°C. After the bricks at room temperature enter the tunnel kiln from the inlet, they are slowly moved by the bottom guide rail in the tunnel kiln, and are preheated in the preheating area, roasted in the high temperature area, cooled to near room temperature in the cooling area 7-4, and then pushed out through the brick outlet.

[0044] The drying flue gas treatment module 201 comprises a flue gas cooling device 10 , a flue gas biological deodorization unit 12 , a cold flue gas valve 13 , a deodorization exhaust point valve 14 , an incineration flue gas bypass 15 and its valve 151 .

[0045] The flue gas cooling device 10 reduces the flue gas temperature to 40-60°C, thereby condensing the water vapor with pungent odor carried from the sludge dryer 4 in the flue gas, and the condensed water is discharged into the sewage treatment system for treatment. The cooled flue gas enters the flue gas biological deodorization unit 12 for further purification.

[0046] The flue gas biological deodorization unit performs deep deodorization on the flue gas and then uses it as cooling air for the tunnel kiln through the cold flue gas valve 13 to enter the cooling area 7-4 of the tunnel kiln unit. At the same time, the biological deodorization unit is provided with a deodorization exhaust point valve, which guides the enriched odor collected from the deodorization exhaust point to the high temperature area of ​​the tunnel kiln unit 7 through the deodorization exhaust point valve for incineration and deodorization.

[0047] The drying flue gas treatment module 201 is connected to the tunnel kiln unit 7 with an incineration flue gas bypass system 15, and is provided with an incineration flue gas bypass valve 151. By adjusting the opening of this valve 151, part of the flue gas that has not passed through the flue gas treatment system can be introduced into the high temperature area 7-3 of the tunnel kiln unit 7 for incineration and deodorization treatment, thereby further ensuring the flue gas treatment effect.

[0048] The sludge extruder 2 of the sludge drying system is located at the bottom of the sludge storage bin 1, the inlet of the wet sludge conveyor 3 is connected to the sludge outlet of the sludge extruder 2, the outlet of the wet sludge conveyor 3 is connected to the sludge inlet of the belt sludge dryer 4, and the sludge outlet of the belt sludge dryer 4 is connected to the inlet of the dry sludge conveyor 5. The smoke and air inlet of the belt sludge dryer 4 is connected to the outlet pipe of the hot air blower 8, and a dehumidifying fan 9 is provided on the smoke and air outlet pipe of the belt sludge dryer 4. The sewage outlet of the sludge extruder 2 is connected to the sewage treatment system 11 through a pipeline.

[0049] The present invention is used in actual production and application process:

[0050] The wet sludge with a water content of about 80% from the sewage treatment plant is stored in a sludge storage bin 1, and the sludge is squeezed into strips by an extruder 2 at the bottom of the sludge storage bin and then sent to the inlet of a belt sludge dryer 4 via a wet sludge conveyor 3. The moisture content of the wet sludge is reduced to about 77% due to the squeezing of the wet sludge by the extruder; the moisture content of the wet sludge is reduced to 35% after hot air drying inside the belt dryer 4, and the sludge is transferred from the end of the bottom mesh belt of the belt sludge dryer 4 to the dry sludge conveyor 5 and then transported to a brick production system 6.

[0051] Air is taken from the high temperature area of ​​300-400℃ of the tunnel kiln unit 7 and sent to the belt sludge dryer 4 through the hot air blower 8. The hot air heats the sludge inside the dryer 4 to reduce the temperature to about 120℃ and then is discharged. During the process of being heated by the flue gas, the moisture of the wet sludge evaporates in the form of water vapor and enters the flue gas and is discharged along with the flue gas through the dehumidification fan 9.

[0052] The flue gas at about 120°C coming out of the dehumidification fan 9 is cooled to 50°C by the flue gas cooling device 10, and the sewage containing high odor is discharged into the sewage treatment system 301 for further treatment; the flue gas at about 50°C is further deodorized by the biological deodorization system 12 and then introduced into the cooling area of ​​the tunnel kiln to form a closed cycle. In order to further ensure the deodorization effect, the wet flue gas at 120°C can be partially introduced into the high temperature area of ​​the tunnel kiln for direct incineration treatment, and the odor from the extraction point of the deodorization unit can also be directly introduced into the high temperature area of ​​the tunnel kiln for direct incineration treatment.

[0053] The above is only a preferred embodiment of the present invention, but the present invention is not limited to the above specific embodiments. For ordinary technicians in this field, several modifications and improvements can be made without departing from the creative concept, which all belong to the protection scope of the present invention.

Claims

1. A sludge drying and resource utilization system using waste heat from a brick-making tunnel kiln, the sludge drying and resource utilization system comprising a sludge drying brick-making module, a drying fume treatment module, and a sewage treatment module; characterized in that: The sludge drying brick making module includes a sludge conveying unit, a sludge dryer, a dry sludge conveyor, a brick making unit and a tunnel kiln unit consisting of a preheating area, a high temperature area and a cooling area; the drying flue gas treatment module includes a flue gas cooling device, a flue gas biological deodorization unit and an incineration flue gas bypass; wherein: The inlet of the sludge dryer is connected to the sludge conveying unit; the outlet of the sludge dryer is connected to the brick inlet of the tunnel kiln unit through the dry sludge conveyor and the brick making unit in sequence; the smoke inlet of the sludge dryer is connected to the hot smoke outlet of the tunnel kiln unit through the blower; the smoke outlet of the sludge dryer is connected to the high temperature area of ​​the tunnel kiln unit through the incineration smoke bypass through one path after the dehumidification fan; the smoke outlet of the sludge dryer is connected to the smoke inlet of the smoke cooling device through another path after the dehumidification fan; wherein: One way of the smoke outlet of the smoke cooling device is connected to the high temperature area of ​​the tunnel kiln unit through the smoke biological deodorization unit and the exhaust point valve in sequence; the other way of the smoke outlet of the smoke cooling device is connected to the cooling area of ​​the tunnel kiln unit through the smoke biological deodorization unit and the cold air valve in sequence.

2. The sludge drying and resource utilization system using waste heat from a brick-making tunnel kiln according to claim 1 is characterized in that: The sludge conveying unit includes a sludge storage bin, an extruder and a wet sludge conveyor; the extruder is located at the bottom of the sludge storage bin, the wet sludge conveyor inlet is connected to the extruder sludge outlet, the wet sludge conveyor outlet is connected to the sludge inlet of the sludge dryer, and the sludge outlet of the sludge dryer is connected to the dry sludge conveyor inlet.

3. The sludge drying and resource utilization system using waste heat from a brick-making tunnel kiln according to claim 1 is characterized in that: The sludge dryer is a belt-type structure, with 3 to 7 layers of horizontally arranged mesh belts inside, each layer of the mesh belt is connected to a variable frequency speed regulating electric transmission module; the mesh belt is made of stainless steel and Teflon materials; wherein: The hot air required for drying the sludge is sent in from the bottom of the sludge dryer through the hot air blower. After penetrating the horizontally moving mesh belt and the sludge laid on the mesh belt layer by layer from bottom to top, the temperature is reduced and the water evaporated from the sludge is carried through the dehumidification fan from the upper side of the sludge dryer and sent into the drying flue gas treatment system.

4. The sludge drying and resource utilization system using waste heat from a brick-making tunnel kiln according to claim 1 is characterized in that: The sludge conveying unit is connected to the sewage treatment module through a drain port; the flue gas cooling device is connected to the sewage treatment module through a drain port; wherein: The flue gas cooling device reduces the flue gas temperature to 40-60°C, thereby condensing the water vapor with pungent odor carried from the sludge dryer in the flue gas, and the condensed water is discharged into the sewage treatment system for treatment. The cooled flue gas enters the flue gas biological deodorization system for further purification.

5. A method for drying and recycling waste heat sludge from a brick-making tunnel kiln using the system described in any one of claims 1 to 4, characterized in that: The steps include: The wet sludge is stored in the sludge storage bin, and the sludge is squeezed into strips by the extruder at the bottom of the sludge storage bin, and then sent to the feeding end of the sludge dryer through the wet sludge conveyor; The moisture content of the wet sludge after hot air drying inside the belt dryer is transferred from the end of the bottom mesh belt of the sludge dryer to the dry sludge conveyor and then transported to the brick making system; Air is taken from the high temperature area of ​​the tunnel kiln unit and sent to the belt sludge dryer through the hot air blower. The hot air heats the sludge inside the sludge dryer to reduce the temperature to 110℃~140℃ and the wet flue gas is discharged. When the wet sludge is heated by the flue gas, its moisture evaporates in the form of water vapor and enters the flue gas and is discharged with the flue gas through the dehumidification fan; The 110℃~140℃ wet flue gas from the dehumidification fan is cooled to 40~60℃ by the flue gas cooling device, and the wastewater is discharged into the wastewater treatment module for further treatment; the 40~60℃ flue gas is further deodorized by the biological deodorization unit and then introduced into the cooling area of ​​the tunnel kiln to form a closed cycle; in: A portion of the wet flue gas at 110°C to 140°C is introduced into the high temperature area of ​​the tunnel kiln for direct incineration treatment, and the exhaust point valve of the deodorization unit is also directly introduced into the high temperature area of ​​the tunnel kiln for direct incineration treatment.

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