Tail gas recycling device
By constructing a kiln flue gas circulation system and applying high-temperature and corrosion-resistant materials, the problems of low energy recovery efficiency and easy damage of the exhaust gas recovery device were solved, and stable and efficient exhaust gas utilization and environmental protection effects were achieved.
Patent Information
- Application Number
- CN202423049477.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-11
- Publication Date
- 2025-09-09
- Estimated Expiration
- 2034-12-11
AI Technical Summary
Existing tail gas recovery devices are inefficient in energy recovery process design, the equipment is easily damaged, it is difficult to operate stably under complex working conditions, and it is impossible to achieve coordinated operation of multiple kilns, resulting in high operating costs and environmental pollution risks.
Construct a flue gas circulation system between kilns, use high-temperature and corrosion-resistant materials and sensor monitoring to achieve complementary use of flue gas, equip with dust filter plates for deep purification, use centrifugal fans to provide power, ensure stable transmission and monitor the working conditions in the kiln.
It improves energy utilization efficiency, reduces operating costs, reduces air pollution, ensures stable system operation, extends equipment life, and improves production safety and environmental protection.
Smart Images
Figure CN223319595U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of tail gas recovery, and more specifically, to a tail gas recovery and utilization device. Background Art
[0002] With the rapid development of the industrial sector, the scale of various industrial production activities continues to expand, bringing with it a series of severe challenges caused by exhaust emissions. Exhaust emissions from common industrial production processes such as sludge drying kilns and ceramsite sintering kilns are not only large in volume but also complex in composition. These emissions contain considerable waste heat energy.
[0003] Although some companies have realized the seriousness of the problem and have introduced some exhaust gas recovery devices in an attempt to find a balance between energy recovery and environmental protection, these existing devices have many inherent deficiencies in their architectural design. For example, the energy recovery process is poorly designed, resulting in a long-term low recovery efficiency and the inability to fully tap the potential value of the waste heat resources in the exhaust gas. The limitations of equipment material selection and manufacturing processes cause the equipment to age and damage rapidly under harsh working conditions such as high temperature and corrosion. Frequent maintenance and replacement not only increase the company's operating costs, but also cause serious disruptions to production continuity. Moreover, when dealing with complex production conditions and multi-kiln collaborative working scenarios, these devices seem to be unable to cope with the situation, making it difficult to achieve efficient and stable operation of the system.
[0004] Therefore, a tail gas recovery and utilization device is now proposed. Utility Model Content
[0005] In order to overcome the above-mentioned defects of the prior art, the present invention provides a tail gas recovery and utilization device to solve the problems raised in the above-mentioned background technology.
[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a tail gas recovery and utilization device, comprising a sludge drying kiln, one end of the sludge drying kiln is connected to a first waste flue gas pipe, the first waste flue gas pipe is connected to a centrifugal fan, the other end of the sludge drying kiln is connected to a fifth waste flue gas pipe, the fifth waste flue gas pipe is connected to a ceramsite sintering kiln, one end of the ceramsite sintering kiln is connected to a fourth waste flue gas pipe, the fourth waste flue gas pipe is connected to a third waste flue gas pipe and a second waste flue gas pipe, the second waste flue gas pipe is connected to the centrifugal fan.
[0007] Preferably, the centrifugal fan is used to provide power for the transmission of waste flue gas in the pipeline, ensuring that the flue gas is stably transported from the sludge drying kiln to the ceramsite sintering kiln and returning part of the hot flue gas from the ceramsite sintering kiln to the drying section of the sludge drying kiln.
[0008] Preferably, the first waste flue gas pipe connected to the sludge drying kiln is used to transport the waste flue gas generated by the ceramsite sintering kiln, and the fifth waste flue gas pipe connected to the sludge drying kiln is used to transport the residual waste flue gas in the sludge drying kiln to the ceramsite sintering kiln for recycling.
[0009] Preferably, a dust filter plate is provided in the fourth waste flue gas duct, and the dust filter plate is used to filter the smoke in the waste flue gas generated by the ceramsite sintering kiln.
[0010] Preferably, the first waste flue gas duct, the second waste flue gas duct, the third waste flue gas duct, the fourth waste flue gas duct and the fifth waste flue gas duct are made of high temperature resistant and corrosion resistant materials.
[0011] Preferably, the sludge drying kiln and the ceramsite sintering kiln are provided with temperature sensors and pressure sensors, which can be used to monitor the working conditions in the kiln.
[0012] The technical effects and advantages of this utility model are:
[0013] 1. By constructing an inter-kiln flue gas circulation system, such as the first waste flue gas pipeline transporting the waste flue gas from the ceramsite sintering kiln to the sludge drying kiln, the fifth waste flue gas pipeline recovering the residual flue gas from the sludge drying kiln to the ceramsite sintering kiln, and the centrifugal fan returning part of the hot flue gas from the ceramsite sintering kiln to the drying section of the sludge drying kiln, the flue gas between kilns can be complementary utilized, the dependence on external energy can be reduced, the value of waste heat resources can be fully tapped, the overall energy utilization efficiency can be improved, and the operating cost and energy consumption can be reduced.
[0014] 2. The dust filter plate in the fourth waste flue gas duct can deeply purify the dust in the waste flue gas of the ceramsite sintering kiln. The filter hole accuracy is determined according to the dust particle size. High-temperature resistant and corrosion-resistant materials are selected and maintenance channels are reserved. This can effectively reduce dust emissions, comply with environmental protection regulations, reduce the risk of air pollution, prevent dust from causing equipment corrosion and blockage, reduce maintenance costs and failure rates, ensure continuous and stable operation of the system, and protect environmental air quality.
[0015] 3. Through the temperature and pressure sensors in the sludge drying kiln and the expanded clay sintering kiln, the working conditions in the kiln can be accurately monitored in real time, and the production parameters can be precisely adjusted accordingly to stabilize product quality. It can also provide early warning of abnormalities such as overtemperature and overpressure, reserve time for disposal, avoid safety hazards and equipment damage, extend equipment life, and enhance production safety, stability, and the scientific and timely nature of management decisions.
[0016] 4. By using high-temperature resistant and corrosion-resistant materials such as ceramic-based composite materials and special stainless steel alloys in each waste flue gas pipe, it can resist thermal deformation, oxidation, thermal shock and erosion by corrosive components, maintain the stability of the pipe shape and size, ensure smooth and sealed flue gas transmission, avoid pipeline maintenance and replacement, reduce operation and maintenance costs, material loss and production stagnation risks, improve the reliability and economic benefits of the system throughout its life cycle, and ensure long-term stable operation of the device. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model.
[0018] The accompanying drawings are marked as follows: 1. first waste flue gas duct; 2. sludge drying kiln; 3. centrifugal fan; 4. second waste flue gas duct; 5. third waste flue gas duct; 6. fourth waste flue gas duct; 7. ceramsite sintering kiln; 8. fifth waste flue gas duct. DETAILED DESCRIPTION
[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.
[0020] As attached Figure 1 The tail gas recovery and utilization device shown includes a sludge drying kiln 2, one end of the sludge drying kiln 2 is connected to a first waste flue gas pipe 1, the first waste flue gas pipe 1 is connected to a centrifugal fan 3, the other end of the sludge drying kiln 2 is connected to a fifth waste flue gas pipe 8, the fifth waste flue gas pipe 8 is connected to a ceramsite sintering kiln 7, one end of the ceramsite sintering kiln 7 is connected to a fourth waste flue gas pipe 6, the fourth waste flue gas pipe 6 is connected to a third waste flue gas pipe 5 and a second waste flue gas pipe 4, the second waste flue gas pipe 4 is connected to the centrifugal fan 3.
[0021] In specific implementation, one end of the sludge drying kiln 2 is connected to the first waste flue gas pipe 1, the first waste flue gas pipe 1 is connected to the centrifugal fan 3, and the other end of the sludge drying kiln 2 is connected to the fifth waste flue gas pipe 8, which leads to the ceramsite sintering kiln 7; one end of the ceramsite sintering kiln 7 is connected to the fourth waste flue gas pipe 6, which is in turn connected to the third waste flue gas pipe 5 and the second waste flue gas pipe 4, and the second waste flue gas pipe 4 is connected to the centrifugal fan 3. This physical connection architecture is used to build a flue gas transmission path between the various components, forming a complete exhaust gas recovery and utilization system framework. The overall layout is established at the system architecture level, laying the foundation for the subsequent implementation of various functions, and building a basic exhaust gas treatment framework that coordinates each kiln body with the pipeline and fan to ensure that the process can be carried out in sequence, so that the flue gas transmission has a physical path premise, ensuring that the entire recovery and utilization process can be started and operated as designed, integrating the exhaust gas resources of different kilns, and creating basic conditions for energy recycling and environmental protection and emission reduction.
[0022] The centrifugal fan 3 is used to provide power for the transmission of waste flue gas in the pipeline, ensuring that the flue gas is stably transported from the sludge drying kiln 2 to the ceramsite sintering kiln 7 and returning part of the hot flue gas from the ceramsite sintering kiln 7 to the drying section of the sludge drying kiln 2.
[0023] During the specific implementation, the centrifugal fan 3 is precisely connected to the key nodes of the system pipeline network during the assembly process. Its power, speed and other performance indicators are adjusted according to the design parameters to ensure that it generates a sufficient pressure difference to propel the waste flue gas. When transmitting the waste flue gas from the sludge drying kiln 2 to the ceramsite sintering kiln 7, the pipeline resistance and pressure gradient in the kiln are overcome to ensure stable transportation. When the hot flue gas from the ceramsite sintering kiln 7 is transported to the drying section of the sludge drying kiln 2, the wind speed and air volume are intelligently adjusted according to the pipeline layout and kiln operating condition feedback, accurately adapting to the drying heat demand and airflow distribution, maintaining stable, precise and controllable flue gas power transmission, and providing the core power guarantee for the directional and stable flow of the flue gas. This enables the waste flue gas from the ceramsite sintering kiln 7 to be reused in the sludge drying kiln 2, expanding the energy cycle. By transporting the hot flue gas, the drying efficiency of the sludge drying kiln 2 is enhanced, additional energy input is reduced, and the overall energy utilization efficiency is improved. Through precise power control, the temperature and humidity environment in the kiln is optimized, improving the stability of production quality, reducing energy consumption and costs, and enhancing the economic efficiency and functional integration of the system operation.
[0024] The first waste flue gas pipe 1 connected to the sludge drying kiln 2 is used to transport the waste flue gas generated by the ceramsite sintering kiln 7, and the fifth waste flue gas pipe 8 connected to the sludge drying kiln 2 is used to transport the residual waste flue gas in the sludge drying kiln 2 to the ceramsite sintering kiln 7 for recycling.
[0025] During the specific implementation, during the construction and installation stage, the first waste flue gas pipeline 1 is accurately laid to seal the sludge drying kiln 2 and the ceramsite sintering kiln 7, ensuring that there is no leakage and constructing a smooth waste flue gas transportation path from the ceramsite sintering kiln 7 to the sludge drying kiln 2; similarly, the fifth waste flue gas pipeline 8 is properly installed to ensure that the residual waste flue gas in the sludge drying kiln 2 can be safely and efficiently transported to the ceramsite sintering kiln 7 for secondary utilization; according to the kiln production rhythm and flue gas discharge volume, the pipeline diameter, slope and other parameters are optimized, and the kiln working cycle is coordinated to achieve seamless connection and transfer of flue gas, thereby realizing complementary utilization of flue gas between kilns. The first waste flue gas pipeline 1 transports the waste flue gas from the ceramsite sintering kiln 7 to supply energy for the sludge drying kiln 2, reducing external energy dependence, reducing operating costs, and improving energy utilization diversity; the fifth waste flue gas pipeline 8 recycles the residual flue gas from the sludge drying kiln 2, tapping the potential energy value, reducing the total emission, meeting the dual demands of environmental protection and energy conservation, deeply optimizing the kiln collaborative working mode from the energy flow architecture, and improving the overall energy efficiency and resource recycling level of the system.
[0026] A dust filter plate is provided in the fourth waste flue gas duct 6 , and the dust filter plate is used to filter the smoke in the waste flue gas generated by the ceramsite sintering kiln 7 .
[0027] During the specific implementation, during the manufacturing or on-site installation of the fourth waste flue gas duct 6, the structure and material of the dust filter plate are precisely designed based on the duct specifications, flue gas flow rate, and smoke dust characteristics. Suitable high-temperature and corrosion-resistant metals or composite materials are selected to construct a multi-layer mesh or fiber composite dust filter structure. The filter aperture precision gradient is determined based on the smoke dust particle size distribution. The dust filter plate is firmly embedded in a specific position in the duct to ensure stability while also reserving a convenient access for disassembly, cleaning, replacement, and maintenance. The smoke dust retention status is monitored according to the operating cycle, and regular maintenance and updates are carried out to ensure long-term stable and efficient dust filtration. This can deeply purify the smoke dust in the waste flue gas of the ceramsite sintering kiln 7, reduce the damage to ambient air quality caused by smoke dust emissions, comply with environmental protection regulations, and reduce the risk of surrounding air pollution. It also prevents smoke dust from depositing in the duct and kiln body, causing equipment corrosion and blockage failures, thereby extending equipment service life, reducing maintenance costs and equipment failure rates, ensuring continuous and stable operation of the system, avoiding production interruptions or sudden drops in energy efficiency due to smoke dust problems, and improving overall operational reliability and environmental friendliness.
[0028] The first waste flue gas duct 1 , the second waste flue gas duct 4 , the third waste flue gas duct 5 , the fourth waste flue gas duct 6 and the fifth waste flue gas duct 8 are made of high temperature resistant and corrosion resistant materials.
[0029] During specific implementation, when selecting the materials for each waste flue gas pipe, high-temperature and corrosion-resistant materials such as ceramic-based composite materials and special stainless steel alloys are selected to make each waste flue gas pipe based on the thermal stress of the pipeline layout environment and the characteristics of the chemical corrosion medium. By giving the pipe the ability to withstand harsh working conditions, it can resist thermal deformation, oxidation, and thermal shock in a high-temperature flue gas environment, maintain the stability of the pipe shape and size, and ensure the smoothness and sealing of flue gas transmission; resist erosion by corrosive components such as acid and alkaline in the flue gas, prevent perforation and leakage of the pipe wall that cause flue gas leakage and pollution, avoid the frequency of pipeline maintenance and replacement, ensure the stable operation of the system for many consecutive years, reduce long-term operation and maintenance costs, material loss and the risk of production stagnation caused by pipeline failure, improve the reliability and economic benefits of the system throughout its life cycle to adapt to the hot flue gas transmission environment, and prevent pipeline damage.
[0030] The sludge drying kiln 2 and the ceramsite sintering kiln 7 are provided with temperature sensors and pressure sensors inside, which can be used to monitor the working conditions inside the kilns.
[0031] During the equipment assembly phase, temperature and pressure sensors were precisely installed at key locations within the sludge drying kiln (2) and ceramsite sintering kiln (7), based on temperature and pressure monitoring requirements. High-temperature-resistant, interference-resistant, and high-precision sensor components were selected and calibrated to ensure accurate and reliable measurements. A data acquisition system was constructed, transmitting real-time data to the PLC and DCS control systems in the central control room via wired or wireless transmission. A visual monitoring software interface was developed, with threshold alarms and trend analysis modules configured according to process requirements. This provided operators with intuitive information on kiln operating conditions and a basis for predicting faults. This feedback allowed precise control of production parameters, enabling real-time and accurate monitoring of key kiln parameters. This provided critical data support for optimizing production processes and enabled operators to adjust kiln heating power, ventilation volume, and material handling rhythm in response to temperature and pressure fluctuations, ensuring stable product quality. The system also provided early warning of equipment anomalies, such as safety hazards and equipment failures caused by overheating and overpressure, allowing for timely response to avoid serious accidents and equipment damage, extending equipment life, and improving production safety, stability, and economic efficiency. Digital monitoring enabled the scientific and timely nature of production management decisions.
[0032] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.
Claims
1. A tail gas recovery and utilization device, comprising a sludge drying kiln (2), characterized in that: One end of the sludge drying kiln (2) is connected to a first waste flue gas pipe (1), the first waste flue gas pipe (1) is connected to a centrifugal fan (3), the other end of the sludge drying kiln (2) is connected to a fifth waste flue gas pipe (8), the fifth waste flue gas pipe (8) is connected to a ceramsite sintering kiln (7), one end of the ceramsite sintering kiln (7) is connected to a fourth waste flue gas pipe (6), the fourth waste flue gas pipe (6) is connected to a third waste flue gas pipe (5) and a second waste flue gas pipe (4), and the second waste flue gas pipe (4) is connected to the centrifugal fan (3).
2. The tail gas recovery and utilization device according to claim 1, characterized in that: The centrifugal fan (3) is used to provide power for the transmission of waste flue gas in the pipeline, ensuring that the flue gas is stably transported from the sludge drying kiln (2) to the ceramsite sintering kiln (7) and returning part of the hot flue gas from the ceramsite sintering kiln (7) to the drying section of the sludge drying kiln (2).
3. The tail gas recovery and utilization device according to claim 1, characterized in that: The first waste flue gas pipeline (1) connected to the sludge drying kiln (2) is used to transport the waste flue gas generated by the ceramsite sintering kiln (7), and the fifth waste flue gas pipeline (8) connected to the sludge drying kiln (2) is used to transport the residual waste flue gas in the sludge drying kiln (2) to the ceramsite sintering kiln (7) for recycling.
4. The tail gas recovery and utilization device according to claim 1, characterized in that: A dust filter plate is provided in the fourth waste flue gas duct (6), and the dust filter plate is used to filter the smoke dust in the waste flue gas generated by the ceramsite sintering kiln (7).
5. The tail gas recovery and utilization device according to claim 1, characterized in that: The first waste flue gas duct (1), the second waste flue gas duct (4), the third waste flue gas duct (5), the fourth waste flue gas duct (6) and the fifth waste flue gas duct (8) are made of high-temperature resistant and corrosion-resistant materials.
6. The tail gas recovery and utilization device according to claim 1, characterized in that: The sludge drying kiln (2) and the ceramsite sintering kiln (7) are provided with temperature sensors and pressure sensors inside, which can be used to monitor the working conditions inside the kilns.