High-efficiency harmless sludge drying and carbonizing treatment system

Abstract

The invention discloses a high-efficiency harmless sludge drying and carbonizing treatment system. According to the method, the sludge cake with the water content of 60% is subjected to drying treatment, the water content of the sludge cake is reduced to 20%-30%, then the sludge cake is subjected to pyrolysis carbonization treatment, the sludge cake is converted into the carbonized product (the water content is smaller than or equal to 5%) and the volatile pyrolysis gas, and reduction, stabilization and recycling of the sludge are achieved. The water content of the sludge can be effectively reduced, and the volume and the weight of the sludge are reduced, so that the land occupied by a landfill site is reduced, and the pollution risk in the transportation process is reduced. The waste flue gas treatment device is used for purifying the tail gas, so that the up-to-standard emission of the tail gas is ensured, and the pollution to the atmospheric environment is reduced. The system can realize reduction of the sludge, so that the landfill, transportation and disposal costs are reduced. According to the system heat supply device, heat energy generated by the biomass combustor and the carbonization furnace is recycled, energy consumption is reduced, and the energy utilization efficiency is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of sludge drying and carbonization treatment, and specifically relates to a high-efficiency and harmless sludge drying and carbonization treatment system. Background Art

[0002] Sludge drying and carbonization treatment, literally speaking, refers to the process of drying and carbonizing sludge through specific technical means. This process aims to remove moisture from sludge and convert it into solid carbonized products with multiple uses; the first step of sludge drying and carbonization treatment is sludge drying. This is the process of converting sludge from liquid or semi-solid to solid by reducing the moisture content in sludge. Drying can be done by various methods such as thermal drying, solar drying, and microwave drying, with the aim of reducing the volume of sludge for subsequent treatment and resource utilization. Next is the carbonization of sludge. Carbonization refers to the process of heating sludge to a certain temperature under anoxic or micro-oxic conditions to cause pyrolysis of its organic matter and convert it into carbonaceous matter. This step can not only further reduce the volume of sludge, but also kill pathogens and make sludge harmless. During the process of sludge drying and carbonization treatment, the organic matter in the sludge is decomposed, and the resulting carbonized product has a porous structure and a large specific surface area, which makes the carbonized sludge have potential application value as an adsorbent, soil conditioner, etc.

[0003] However, common sludge drying and carbonization systems require large equipment and complex control systems, resulting in high equipment investment costs. At the same time, the drying and carbonization process consumes a lot of heat energy, resulting in high operating energy consumption and increased processing costs. In addition, harmful gases such as volatile organic compounds are produced during the carbonization process, which require strict treatment to meet emission standards, making treatment difficult and costly. Summary of the invention

[0004] The purpose of the present invention is to provide a high-efficiency and harmless sludge drying and carbonization treatment system in order to solve the above-mentioned problems.

[0005] The technical solution adopted by the present invention is as follows: a high-efficiency and harmless sludge drying and carbonization treatment system, the system comprising: a sludge storage and conveying device, a sludge drying device, a sludge carbonization device, a carbonized material cooling and unloading storage device, a waste flue gas treatment device, a system heating device and supporting auxiliary equipment;

[0006] The sludge storage and conveying device is the starting point of the entire system, responsible for conveying the sludge cake with a moisture content of 60% from the storage bin to the silo of the sludge drying device. The drying device sends the sludge into the internal heating rotary drying furnace through the drying conveying screw. Under the action of the guide mechanism and hot air heating, the moisture content of the sludge is reduced to 20%-30%. The dried sludge is sent to the external heating rotary pyrolysis carbonization furnace in the sludge carbonization device through the transfer conveyor and the pyrolysis carbonization quantitative supply machine for pyrolysis carbonization treatment. The carbonization product then enters the carbonized material cooling and unloading storage device, and after cooling and conveying, it is stored or transported to other places for comprehensive utilization;

[0007] The system heating device provides heat source for the drying furnace and carbonization furnace through the burner. The tail gas generated by the drying furnace is purified by the waste flue gas treatment device and then discharged in compliance with the emission standards, while the tail gas generated by the carbonization furnace enters the carbonization secondary combustion chamber, where it is mixed with the high-temperature gas generated by the burner and burned, and the heat generated is used to provide heat source for the carbonization furnace. In addition, the flue gas after heat exchange and cooling in the carbonization furnace is transported to the drying furnace through the high-temperature fan of the carbonization jacket, and together with the combustion flue gas in the drying auxiliary combustion furnace, it provides heat source for the drying process, realizing the recycling of heat energy.

[0008] In a preferred embodiment, the sludge storage and conveying device is the starting point of the entire sludge drying and carbonization system, and undertakes the important task of receiving and storing sludge cakes. The sludge cakes with a moisture content of 60% after preliminary treatment by filter pressing or other means are sent to the sludge cake storage bin, and then the discharge screw conveys the cakes to the feeding conveyor, and finally to the silo of the sludge drying device, providing sufficient raw materials for the subsequent drying process.

[0009] In a preferred embodiment, the sludge drying device is one of the core units in the system, which contains a drying silo, a drying conveying screw and an internal heating rotary drying furnace. The drying silo is responsible for storing the sludge cake to be dried and transporting it to the internal heating rotary drying furnace through the drying conveying screw. In the drying furnace, the material is heated to 160-200°C in the process of moving from the front end to the rear end of the drying furnace under the action of the guide mechanism and hot air heating, so that the moisture content is reduced to 20%-30%, completing the drying process.

[0010] In a preferred embodiment, a material diversion mechanism is provided inside the sludge carbonization device, and the rotation of the furnace body enables the material to move from the front end to the rear end on the basis of sufficient heat exchange with the furnace wall, completing the pyrolysis carbonization process, and finally being discharged from the tail end of the pyrolysis carbonization furnace, after being cooled and transported to a storage bin for storage through a multi-stage cooling device for carbonized materials, and then transported out by a transport vehicle for comprehensive utilization.

[0011] In a preferred embodiment, the carbonized product cooling, unloading and storage device is responsible for cooling and storing the carbonized product produced by the carbonization furnace for subsequent transportation and utilization. The carbonized product multi-stage cooling device cools and transports the carbonized product to the carbonized product storage bin. The carbonized product storage bin is responsible for storing the carbonized product and maintaining its stability.

[0012] In a preferred embodiment, the waste flue gas treatment device is responsible for purifying the tail gas generated by the drying furnace and the carbonization furnace to ensure that it meets the emission standards and reduces the impact on the environment. The device mainly includes a cyclone dust removal device, a bag dust collector, a spray tower and a deodorization device. The cyclone dust removal device removes large particles of dust in the flue gas, the bag dust collector further removes fine dust in the flue gas, the spray tower removes harmful gases and odors in the flue gas through water mist, and the deodorization device removes odors in the flue gas.

[0013] In a preferred embodiment, the system heating device provides a heat source for the drying furnace and the carbonization furnace to ensure the smooth progress of the sludge drying and carbonization process. The device mainly includes a burner, a carbonization secondary combustion chamber, a heat exchange jacket for the drying furnace, and a high-temperature fan for the carbonization jacket. The burner generates high-temperature gas by burning biomass fuel to provide a heat source for the drying furnace and the carbonization furnace. The carbonization secondary combustion chamber burns the volatile pyrolysis gas generated by the dried material, and uses the generated heat to provide a heat source for the carbonization furnace, thereby realizing the recycling of thermal energy. The heat exchange jacket of the drying furnace transports the flue gas after heat exchange and cooling of the carbonization furnace to the drying furnace, providing a heat source for the drying process. The high-temperature fan of the carbonization jacket transports the flue gas after heat exchange and cooling of the carbonization furnace to the drying furnace.

[0014] In a preferred embodiment, the supporting auxiliary equipment is responsible for monitoring, controlling and collecting data of the entire system to ensure stable operation of the system. The device mainly includes an electrical control system, a PLC system and a human-machine interface. The electrical control system controls the operation of the entire system, including start and stop, adjustment parameters, etc. The PLC system monitors the operating status of the system in real time, and collects and stores data to provide data support for system optimization. The human-machine interface facilitates operators to monitor and operate the entire system, and view operating data and analysis results.

[0015] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0016] 1. In the present invention, the sludge cake with a moisture content of 60% is dried to reduce its moisture content to 20%-30%, and then pyrolysis carbonization is performed to convert it into carbonization products and volatile pyrolysis gas, thereby achieving sludge reduction, stabilization and resource utilization. The system can effectively reduce the moisture content of the sludge, reduce its volume and weight, thereby reducing the land occupied by the landfill and reducing the risk of pollution during transportation. The waste flue gas treatment device purifies the exhaust gas to ensure that it meets the emission standards and reduces pollution to the atmospheric environment. The carbonization product can be utilized as a resource, for example, as a fuel, building material or soil conditioner, to achieve the recycling of resources.

[0017] 2. In the present invention, the system can achieve sludge reduction, thereby reducing the cost of landfill, transportation and disposal. The resource utilization of carbonized products can bring certain economic benefits and make up for part of the processing costs. The system heating device utilizes the heat energy generated by the burner and the carbonization furnace for recycling, reduces energy consumption, and improves energy utilization efficiency. The sludge can be effectively treated, its pollution to the environment can be reduced, and the environmental sanitation can be improved. The resource utilization of carbonized products is in line with the concepts of circular economy and sustainable development, and contributes to environmental protection and resource utilization. The construction and operation of the sludge drying and carbonization system requires a certain amount of human resources, which can provide employment opportunities and promote social and economic development. The advanced drying and carbonization technology is adopted, with high processing efficiency and large sludge processing capacity. Equipped with a complete control system, it can realize automatic operation, reduce labor costs, and improve operating efficiency. The use of mature technology and equipment has stable and reliable operation and convenient maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a flow chart of the sludge drying and carbonization treatment system of the present invention; DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0020] Reference Figure 1 , a high-efficiency and harmless sludge drying and carbonization treatment system, the system comprises: a sludge storage and conveying device, a sludge drying device, a sludge carbonization device, a carbonized material cooling and unloading storage device, a waste flue gas treatment device, a system heating device and supporting auxiliary equipment;

[0021] The sludge storage and conveying device is the starting point of the entire system, responsible for conveying the sludge cake with a moisture content of 60% from the storage bin to the silo of the sludge drying device. The drying device sends the sludge into the internal heating rotary drying furnace through the drying conveying screw. Under the action of the guide mechanism and hot air heating, the moisture content of the sludge is reduced to 20%-30%. The dried sludge is sent to the external heating rotary pyrolysis carbonization furnace in the sludge carbonization device through the transfer conveyor and the pyrolysis carbonization quantitative supply machine for pyrolysis carbonization treatment. The carbonization product then enters the carbonized material cooling and unloading storage device, and after cooling and conveying, it is stored or transported to other places for comprehensive utilization;

[0022] The system heating device provides heat source for the drying furnace and carbonization furnace through the burner. The tail gas generated by the drying furnace is purified by the waste flue gas treatment device and then discharged in compliance with the emission standards, while the tail gas generated by the carbonization furnace enters the carbonization secondary combustion chamber, where it is mixed with the high-temperature gas generated by the burner and burned, and the heat generated is used to provide heat source for the carbonization furnace. In addition, the flue gas after heat exchange and cooling in the carbonization furnace is transported to the drying furnace through the high-temperature fan of the carbonization jacket, and together with the biomass combustion flue gas in the drying auxiliary combustion furnace, it provides heat source for the drying process, realizing the recycling of heat energy.

[0023] The sludge storage and conveying device is the starting point of the entire sludge drying and carbonization system, and undertakes the important task of receiving and storing sludge cakes. The sludge cakes with a moisture content of 60% after preliminary treatment by filter pressing or other means are sent to the sludge cake storage bin, and then the discharge screw conveys the cakes to the feeding conveyor, and finally to the silo of the sludge drying device, providing sufficient raw materials for the subsequent drying process.

[0024] The sludge drying device is one of the core units in the system, which contains a drying silo, a drying conveying screw and an internal heating rotary drying furnace. The drying silo is responsible for storing the sludge cake to be dried and transporting it to the internal heating rotary drying furnace through the drying conveying screw. In the drying furnace, the material is heated to 160-200°C in the process of moving from the front end to the rear end of the drying furnace under the action of the guide mechanism and hot air heating, so that the moisture content is reduced to 20%-30%, completing the drying process.

[0025] The sludge carbonization device is provided with a material diversion mechanism inside. Through the rotation of the furnace body, the material can be moved from the front end to the rear end on the basis of sufficient heat exchange with the furnace wall, completing the pyrolysis carbonization process, and finally discharged from the tail end of the pyrolysis carbonization furnace. After being cooled and transported to the storage bin by a multi-stage cooling device for carbonized materials, it is finally transported out by a transport vehicle for comprehensive utilization.

[0026] The carbonized product cooling, unloading and storage device is responsible for cooling and storing the carbonized product produced by the carbonization furnace for subsequent transportation and utilization. The carbonized product multi-stage cooling device cools and transports the carbonized product to the carbonized product storage bin. The carbonized product storage bin is responsible for storing the carbonized product and maintaining its stability.

[0027] The waste flue gas treatment device is responsible for purifying the tail gas generated by the drying furnace and the carbonization furnace to ensure that it meets the emission standards and reduces the impact on the environment. The device mainly includes a cyclone dust removal device, a bag dust collector, a spray tower and a deodorization device. The cyclone dust removal device removes large particles of dust in the flue gas, the bag dust collector further removes fine dust in the flue gas, the spray tower removes harmful gases and odors in the flue gas through water mist, and the deodorization device removes odors in the flue gas.

[0028] The system heating device provides heat source for the drying furnace and carbonization furnace to ensure the smooth progress of the sludge drying and carbonization process. The device mainly includes a burner, a carbonization secondary combustion chamber, a drying furnace heat exchange jacket and a carbonization jacket high-temperature fan. The burner generates high-temperature gas by burning biomass fuel to provide a heat source for the drying furnace and carbonization furnace. The carbonization secondary combustion chamber burns the volatile pyrolysis gas generated by the dried material, and uses the generated heat to provide a heat source for the carbonization furnace, realizing the recycling of thermal energy. The drying furnace heat exchange jacket transports the flue gas after heat exchange and cooling of the carbonization furnace to the drying furnace, providing a heat source for the drying process. The carbonization jacket high-temperature fan transports the flue gas after heat exchange and cooling of the carbonization furnace to the drying furnace.

[0029] The supporting auxiliary equipment is responsible for monitoring, controlling and collecting data of the entire system to ensure stable operation of the system. The device mainly includes an electrical control system, a PLC system and a human-machine interface. The electrical control system controls the operation of the entire system, including start and stop, adjustment parameters, etc. The PLC system monitors the operating status of the system in real time, and collects and stores data to provide data support for system optimization. The human-machine interface facilitates operators to monitor and operate the entire system, and view operating data and analysis results.

[0030] In the present invention, the sludge cake with a moisture content of 60% is dried to reduce its moisture content to 20%-30%, and then subjected to pyrolysis carbonization treatment to convert it into carbonized products and volatile pyrolysis gas, thereby achieving sludge reduction, stabilization and resource utilization. The system can effectively reduce the moisture content of the sludge, reduce its volume and weight, thereby reducing the land occupied by the landfill and reducing the risk of pollution during transportation. The waste flue gas treatment device purifies the exhaust gas to ensure that it meets the emission standards and reduces pollution to the atmospheric environment. The carbonized products can be utilized as resources, for example, as fuel, building materials or soil conditioners, to achieve the recycling of resources.

[0031] In the present invention, the system can achieve sludge reduction, thereby reducing the cost of landfill, transportation and disposal. The resource utilization of carbonized products can bring certain economic benefits and make up for part of the processing costs. The system heating device utilizes the heat energy generated by the burner and the carbonization furnace for recycling, reduces energy consumption, and improves energy utilization efficiency. The sludge can be effectively treated, its pollution to the environment can be reduced, and the environmental sanitation can be improved. The resource utilization of carbonized products is in line with the concepts of circular economy and sustainable development, and contributes to environmental protection and resource utilization. The construction and operation of the sludge drying and carbonization system requires a certain amount of human resources, which can provide employment opportunities and promote social and economic development. Advanced drying and carbonization technology is adopted, with high processing efficiency and large sludge processing capacity. Equipped with a complete control system, it can realize automatic operation, reduce labor costs, and improve operating efficiency. Using mature technology and equipment, the operation is stable and reliable, and maintenance is convenient.

[0032] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or still includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0033] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A highly efficient and harmless sludge drying and carbonization treatment system, characterized by: The system includes: a sludge storage and conveying device, a sludge drying device, a sludge carbonization device, a carbonized material cooling and unloading storage device, a waste flue gas treatment device, a system heating device and supporting auxiliary equipment; The sludge storage and conveying device is the starting point of the entire system, responsible for conveying the sludge cake with a moisture content of 60% from the storage bin to the silo of the sludge drying device; the drying device sends the sludge into the internal heating rotary drying furnace through the drying conveying screw, and the sludge moisture content is reduced to 20%-30% under the action of the guide mechanism and hot air heating; the dried sludge is sent to the external heating rotary pyrolysis carbonization furnace in the sludge carbonization device through the transfer conveyor and the pyrolysis carbonization quantitative feeder for pyrolysis carbonization treatment; the carbonization product then enters the carbonization cooling and unloading storage device, and after cooling and conveying, it is stored or transported to other places for comprehensive utilization; The system heating device provides heat source for the drying furnace and carbonization furnace through the burner; the exhaust gas generated by the drying furnace is purified by the waste flue gas treatment device and meets the emission standards, while the exhaust gas generated by the carbonization furnace enters the carbonization secondary combustion chamber, mixed with the high-temperature gas generated by the burner and burned, and the heat generated is used to provide heat source for the carbonization furnace; in addition, the flue gas after heat exchange and cooling in the carbonization furnace is transported to the drying furnace through the high-temperature fan of the carbonization jacket, and together with the combustion flue gas in the drying auxiliary combustion furnace, it provides heat source for the drying process, realizing the recycling of thermal energy.

2. A high-efficiency harmless sludge drying and carbonization treatment system as claimed in claim 1, characterized in that: The sludge storage and conveying device is the starting point of the entire sludge drying and carbonization system, and undertakes the important task of receiving and storing sludge cakes; The sludge cake with a moisture content of 60% after preliminary treatment by filtration or other means is sent to the sludge cake storage bin, and then the discharge screw transports the sludge cake to the feeding conveyor, and finally to the silo of the sludge drying device, providing sufficient raw materials for the subsequent drying process.

3. A high-efficiency harmless sludge drying and carbonization treatment system as claimed in claim 1, characterized in that: The sludge drying device is one of the core units in the system, which includes a drying silo, a drying conveying screw and an internal heating rotary drying furnace; the drying silo is responsible for storing the sludge cake to be dried, and conveying it to the internal heating rotary drying furnace through the drying conveying screw; in the drying furnace, the material is heated to 160-200°C in the process of moving from the front end to the rear end of the drying furnace under the action of the guide mechanism and hot air heating, so that the moisture content is reduced to 20%-30%, completing the drying process.

4. A high-efficiency harmless sludge drying and carbonization treatment system as claimed in claim 1, characterized in that: The sludge carbonization device is provided with a material diversion mechanism inside. Through the rotation of the furnace body, the material can be moved from the front end to the rear end on the basis of sufficient heat exchange with the furnace wall, completing the pyrolysis carbonization process, and finally discharged from the tail end of the pyrolysis carbonization furnace. After being cooled and transported to the storage bin by a multi-stage cooling device for carbonized materials, it is finally transported out by a transport vehicle for comprehensive utilization.

5. The high-efficiency harmless sludge drying and carbonization treatment system according to claim 1, characterized in that: The carbonized material cooling, unloading and storing device is responsible for cooling and storing the carbonized products produced by the carbonization furnace for subsequent transportation and utilization; the carbonized material multi-stage cooling device cools down and transports the carbonized products to the carbonized material storage; the carbonized material storage bin is responsible for storing the carbonized products and maintaining their stability.

6. A high-efficiency harmless sludge drying and carbonization treatment system as claimed in claim 1, characterized in that: The waste flue gas treatment device is responsible for purifying the exhaust gas generated by the drying furnace and the carbonization furnace to ensure that it meets the emission standards and reduces the impact on the environment; the device includes a cyclone dust removal device, a bag dust collector, a spray tower and a deodorization device; the cyclone dust removal device removes large particles of dust in the flue gas, the bag dust collector further removes fine dust in the flue gas, the spray tower removes harmful gases and odors in the flue gas through water mist, and the deodorization device removes odors in the flue gas.

7. A high-efficiency harmless sludge drying and carbonization treatment system as claimed in claim 1, characterized in that: The system heating device provides heat source for the drying furnace and the carbonization furnace to ensure the smooth progress of the sludge drying and carbonization process; the device includes a burner, a carbonization secondary combustion chamber, a drying furnace heat exchange jacket and a carbonization jacket high-temperature fan; the burner generates high-temperature gas by burning fuel to provide a heat source for the drying furnace and the carbonization furnace; the carbonization secondary combustion chamber burns the volatile pyrolysis gas generated by the drying material, and uses the generated heat to provide a heat source for the carbonization furnace, thereby realizing the recycling of thermal energy; the drying furnace heat exchange jacket transports the flue gas after heat exchange and cooling of the carbonization furnace to the drying furnace to provide a heat source for the drying process; the carbonization jacket high-temperature fan transports the flue gas after heat exchange and cooling of the carbonization furnace to the drying furnace.

8. The high-efficiency harmless sludge drying and carbonization treatment system according to claim 1, characterized in that: The supporting auxiliary equipment is responsible for monitoring, controlling and collecting data of the entire system to ensure stable operation of the system; the device includes an electrical control system, a PLC system and a human-machine interface; The electrical control system controls the operation of the entire system, including starting and stopping, and adjusting parameters; The PLC system monitors the operating status of the system in real time, collects and stores data, and provides data support for system optimization; The human-machine interface allows operators to monitor and operate the entire system and view operating data and analysis results.

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