Energy-saving and environment-friendly type cement kiln bypass air release system
Patent Information
- Application Number
- CN202522275017.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-28
- Publication Date
- 2026-09-04
- Estimated Expiration
- 2035-10-28
AI Technical Summary
[0003]利用急冷器对高温烟气进行瞬间冷却是旁路放风的关键步骤，目的是防止有害物质在后续管道和设备中再次冷凝和堵塞，但现有的急冷装置多为直筒式单进风结构，存在高温烟气与冷风混合效率低、急冷效果差等问题，不能很好的满足烟气的降温需求，且由于烟气的降温速度慢，还会导致二噁英的再次生成，对环境造成污染；其次，为了达到急冷效果，需要消耗大量冷风，结果就是由于大量冷风与烟气的混合，进而产生更多的废气，增加后续废气的处理量
[0011]This utility model is used for bypass ventilation in cement kilns. In implementation, a portion of the flue gas from the kiln tail flue is extracted according to regulations. The flue gas is then sequentially passed through a quench cooler, a waste heat boiler, and a dust collector. The quench cooler rapidly cools the flue gas to approximately 200°C. This rapid cooling prevents the formation of dioxins and, through rapid cooling, causes volatile components such as potassium, sodium, chlorine, and sulfur to condense and crystallize quickly, transforming from a gaseous phase to a solid phase, forming tiny particulate matter. Subsequently, the waste heat boiler absorbs the heat from the flue gas, achieving energy savings and avoiding heat loss while facilitating the operation of the subsequent dust collector. Most dust collectors use bag filters to remove dust and the condensed particulate matter from the flue gas, thereby permanently removing harmful volatile components such as potassium, sodium, chlorine, and sulfur from the kiln system. Finally, the filtered flue gas is passed into the high-temperature zone of the grate cooler, where the high-temperature, oxygen-rich environment thoroughly decomposes the odorous components in the flue gas, preventing pollution from the environment. During operation, the quench cooler draws flue gas from the kiln tail flue into the inlet chamber, then through the upper air pipe into the cooling chamber. A flue gas passage is formed between the spiral half-pipe and the spiral coil within the cooling chamber, allowing the flue gas to flow back and forth. The flue gas flows up and down within this passage, continuously exchanging heat with the cooling medium in the spiral half-pipe and spiral coil during this flow, reducing the flue gas temperature to approximately 500℃. Subsequently, it enters the inner cylinder tangentially through the inlet, forming a swirling flow. Landfill leachate or domestic sewage is then introduced into the spray mechanism. This sewage is sprayed out from the spray mechanism, forming a water mist that comes into contact with the flue gas. The water mist mixes evenly and rapidly with the swirling flue gas, causing the flue gas to cool down quickly and evenly. Simultaneously, odorous gases collected from the landfill and during domestic and industrial processes are introduced into the central air pipe. Similarly, as the flue gas swirls downwards, it mixes evenly and rapidly with the odorous gases, accelerating the cooling rate and achieving highly efficient quenching of the flue gas.In operation, this invention addresses the characteristic that dioxins are easily generated in the temperature range of 250℃ to 450℃ during flue gas cooling. When the flue gas enters the quencher, the temperature is first lowered to approximately 500℃ using a spiral half-pipe and spiral coil. Then, leachate and odorous gases from landfills are used to rapidly cool the flue gas, reducing its temperature to approximately 200℃ in a very short time. Compared to most current quenchers that directly cool high-temperature flue gas, this invention employs a two-stage cooling structure. In the second stage of quenching, because the first stage has already absorbed a significant amount of heat from the flue gas, the amount of heat required for the second stage is reduced. This makes it easier for the flue gas temperature to quickly jump above the dioxin synthesis temperature range, preventing sufficient time for dioxin formation and thus inhibiting dioxin generation at its source. This more effectively ensures the quenching effect of the flue gas. This invention improves the stability of flue gas rapid cooling. Secondly, during rapid cooling, the flue gas is in a swirling state while simultaneously being injected with leachate water mist and garbage odor. The flue gas, water mist, and odor have high mixing efficiency, allowing for efficient, rapid, and uniform mixing to achieve rapid cooling. Furthermore, this invention uses wastewater such as leachate and garbage odor to cool the flue gas, replacing the water and air used in existing technologies. While achieving rapid cooling, the wastewater and odor are already pollution sources requiring treatment, thus avoiding the addition of new pollution sources and increasing the amount of pollution to be treated. In contrast, mixing water and air into the flue gas would significantly increase the amount of flue gas to be treated, thereby increasing production costs. Moreover, this invention uses a grate cooler to thoroughly decompose and treat the flue gas, eliminating the problem of flue gas pollution. In summary, this invention has the advantages of high flue gas and cold air mixing efficiency, good rapid cooling effect, reduced flue gas generation, and energy saving and environmental protection.
Smart Images
Figure CN224719210U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of cement kiln bypass ventilation systems, specifically to an energy-saving and environmentally friendly cement kiln bypass ventilation system. Background Technology
[0002] In the process of co-processing municipal solid waste in cement kilns, under high-temperature conditions, components such as potassium, sodium, chlorine, and sulfur introduced from cement raw materials, municipal solid waste, and fuel will volatilize into gaseous states. These components will enter the lower-temperature preheater with the flue gas, condense into solids, adhere to the surface of raw material particles, and be carried back to the high-temperature zone for volatilization. This process forms an internal cycle of enrichment, which may cause problems such as preheater scaling and blockage, kiln ring and ball formation, decreased clinker quality, and refractory material erosion. Therefore, when the total amount of these harmful components exceeds the process tolerance limit, a bypass venting system must be used to break this vicious cycle. During bypass venting, the high-temperature dust-laden flue gas extracted from the kiln tail flue does not contain dioxins. To inhibit the re-formation of dioxins, an appropriate amount of cold air is blown in by a quenching fan to rapidly cool the flue gas to below 250°C. At the same time, this allows the harmful components to crystallize and solidify, adhering to the dust. After passing through a bag filter, the fly ash is separated from the flue gas before being discharged.
[0003] Instantly cooling high-temperature flue gas using a quench cooler is a crucial step in bypass venting, aiming to prevent harmful substances from re-condensing and clogging subsequent pipelines and equipment. However, existing quench coolers are mostly straight-cylinder single-inlet structures, which suffer from low mixing efficiency between high-temperature flue gas and cold air, and poor quenching effect. They cannot adequately meet the cooling requirements of the flue gas, and the slow cooling rate can lead to the regeneration of dioxins, causing environmental pollution. Furthermore, achieving the quenching effect requires consuming a large amount of cold air, resulting in increased waste gas production due to the mixing of large amounts of cold air with the flue gas, thus increasing the amount of waste gas that needs to be treated. Therefore, developing an energy-saving and environmentally friendly cement kiln bypass venting system with high flue gas-cold air mixing efficiency, good quenching effect, and reduced waste gas treatment volume is objectively necessary. Utility Model Content
[0004] The purpose of this invention is to provide an energy-saving and environmentally friendly bypass ventilation system for cement kilns that has high efficiency in mixing flue gas and cold air, good rapid cooling effect, and can reduce the amount of flue gas generated.
[0005] The purpose of this utility model is achieved as follows: It includes a cement kiln and kiln tail flue chambers and grate coolers located at both ends of the cement kiln. The kiln tail flue chambers are sequentially connected via pipelines to a quench cooler, a waste heat boiler, and a dust collector. The outlet of the dust collector is connected to the high-temperature zone of the grate cooler via a pipeline. The quench cooler includes a shell and an inner cylinder disposed within the shell. The annular space between the shell and the inner cylinder is divided into an inlet chamber and a cooling chamber from bottom to top by an annular plate. An inlet is provided on the inlet chamber. Spiral half-pipes are provided on both the inner wall of the shell and the outer wall of the inner cylinder within the cooling chamber. Multiple spiral half-pipes are concentrically arranged at intervals within the cooling chamber. The spiral coil is tightly fitted between adjacent tubes. Airflow channels are provided between the upper end of the spiral coil and the top of the quench cooler, and between the lower end of the spiral coil and the annular plate. The airflow channels of two adjacent spiral coils are arranged alternately. An air inlet is tangentially provided on the inner cylinder above the spiral half-tube. A central air pipe with its lower end sealed is provided in the center of the inner cylinder. Several jet holes are provided at intervals on the central air pipe. A spray mechanism is provided in the upper part of the inner cylinder. An air outlet is provided in the bottom of the inner cylinder. Multiple upper air pipes are provided on the annular plate between the spiral half-tube and the outermost spiral coil on the inner wall of the shell.
[0006] Furthermore, the spraying mechanism includes a ring tube and an inlet pipe disposed on the ring tube, with multiple nozzles evenly distributed around the bottom circumference of the ring tube.
[0007] Furthermore, the upper trachea is evenly distributed along the circumference of the ring plate and is arranged obliquely along the circumference of the ring plate.
[0008] Furthermore, spiral heat-conducting plates are installed on both the spiral half-tube and the spiral coil.
[0009] Furthermore, a temperature sensor is installed at the top of the cooling chamber near the air intake.
[0010] Furthermore, a heat insulation layer is installed on the outer wall of the inner cylinder inside the air intake chamber.
[0011] This utility model is used for bypass ventilation in cement kilns. In implementation, a portion of the flue gas from the kiln tail flue is extracted according to regulations. The flue gas is then sequentially passed through a quench cooler, a waste heat boiler, and a dust collector. The quench cooler rapidly cools the flue gas to approximately 200°C. This rapid cooling prevents the formation of dioxins and, through rapid cooling, causes volatile components such as potassium, sodium, chlorine, and sulfur to condense and crystallize quickly, transforming from a gaseous phase to a solid phase, forming tiny particulate matter. Subsequently, the waste heat boiler absorbs the heat from the flue gas, achieving energy savings and avoiding heat loss while facilitating the operation of the subsequent dust collector. Most dust collectors use bag filters to remove dust and the condensed particulate matter from the flue gas, thereby permanently removing harmful volatile components such as potassium, sodium, chlorine, and sulfur from the kiln system. Finally, the filtered flue gas is passed into the high-temperature zone of the grate cooler, where the high-temperature, oxygen-rich environment thoroughly decomposes the odorous components in the flue gas, preventing pollution from the environment. During operation, the quench cooler draws flue gas from the kiln tail flue into the inlet chamber, then through the upper air pipe into the cooling chamber. A flue gas passage is formed between the spiral half-pipe and the spiral coil within the cooling chamber, allowing the flue gas to flow back and forth. The flue gas flows up and down within this passage, continuously exchanging heat with the cooling medium in the spiral half-pipe and spiral coil during this flow, reducing the flue gas temperature to approximately 500℃. Subsequently, it enters the inner cylinder tangentially through the inlet, forming a swirling flow. Landfill leachate or domestic sewage is then introduced into the spray mechanism. This sewage is sprayed out from the spray mechanism, forming a water mist that comes into contact with the flue gas. The water mist mixes evenly and rapidly with the swirling flue gas, causing the flue gas to cool down quickly and evenly. Simultaneously, odorous gases collected from the landfill and during domestic and industrial processes are introduced into the central air pipe. Similarly, as the flue gas swirls downwards, it mixes evenly and rapidly with the odorous gases, accelerating the cooling rate and achieving highly efficient quenching of the flue gas.In operation, this invention addresses the characteristic that dioxins are easily generated in the temperature range of 250℃ to 450℃ during flue gas cooling. When the flue gas enters the quencher, the temperature is first lowered to approximately 500℃ using a spiral half-pipe and spiral coil. Then, leachate and odorous gases from landfills are used to rapidly cool the flue gas, reducing its temperature to approximately 200℃ in a very short time. Compared to most current quenchers that directly cool high-temperature flue gas, this invention employs a two-stage cooling structure. In the second stage of quenching, because the first stage has already absorbed a significant amount of heat from the flue gas, the amount of heat required for the second stage is reduced. This makes it easier for the flue gas temperature to quickly jump above the dioxin synthesis temperature range, preventing sufficient time for dioxin formation and thus inhibiting dioxin generation at its source. This more effectively ensures the quenching effect of the flue gas. This invention improves the stability of flue gas rapid cooling. Secondly, during rapid cooling, the flue gas is in a swirling state while simultaneously being injected with leachate water mist and garbage odor. The flue gas, water mist, and odor have high mixing efficiency, allowing for efficient, rapid, and uniform mixing to achieve rapid cooling. Furthermore, this invention uses wastewater such as leachate and garbage odor to cool the flue gas, replacing the water and air used in existing technologies. While achieving rapid cooling, the wastewater and odor are already pollution sources requiring treatment, thus avoiding the addition of new pollution sources and increasing the amount of pollution to be treated. In contrast, mixing water and air into the flue gas would significantly increase the amount of flue gas to be treated, thereby increasing production costs. Moreover, this invention uses a grate cooler to thoroughly decompose and treat the flue gas, eliminating the problem of flue gas pollution. In summary, this invention has the advantages of high flue gas and cold air mixing efficiency, good rapid cooling effect, reduced flue gas generation, and energy saving and environmental protection. Attached Figure Description
[0012] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the structure of the rapid cooler 4 in this utility model; In the diagram: 1-Cement kiln, 2-Kiln tail flue, 3-Grate cooler, 4-Quick cooler, 5-Waste heat boiler, 6-Dust collector, 7-Shell, 8-Inner cylinder, 9-Air inlet chamber, 10-Cooling chamber, 11-Spiral half-pipe, 12-Spiral coil, 13-Central air pipe, 14-Upper air pipe, 15-Ring pipe, 16-Liquid inlet pipe, 17-Spiral heat conduction plate, 18-Temperature sensor, 19-Insulation layer. Detailed Implementation
[0013] The present invention will be further described below with reference to the accompanying drawings, but this description is not intended to limit the present invention in any way. Any changes or improvements made based on the present invention shall fall within the protection scope of the present invention.
[0014] like Figures 1-2 As shown, this utility model includes a cement kiln 1 and kiln tail flue chambers 2 and grate coolers 3 located at both ends of the cement kiln 1. The kiln tail flue chamber 2 is connected in sequence to a quench cooler 4, a waste heat boiler 5, and a dust collector 6 via pipelines. The waste heat boiler 5 and the dust collector 6 are existing equipment, used to absorb waste heat from the flue gas and remove dust from the flue gas, respectively. The dust collector 6 is mostly a bag filter. The outlet of the dust collector 6 is connected to the high-temperature area of the grate cooler 3 via a pipeline. The quench cooler 4 includes a shell 7 and an inner cylinder 8 located inside the shell 7. The annular space between the shell 7 and the inner cylinder 8 is divided into an inlet chamber 9 and a cooling chamber 10 from bottom to top by an annular plate. An air inlet is provided on the inlet chamber 9. Spirals are provided on the inner wall of the shell 7 and the outer wall of the inner cylinder 8 in the cooling chamber 10. The half-pipe 11 and the cooling chamber 10 are equipped with multiple spiral coils 12 arranged concentrically at intervals. The adjacent spiral coils 12 are tightly fitted together. Airflow channels are provided between the upper end of the spiral coil 12 and the top of the quencher 4, and between the lower end of the spiral coil 12 and the ring plate. The airflow channels of two adjacent spiral coils 12 are arranged alternately. The inner cylinder 8 above the spiral half-pipe 11 is provided with an air inlet tangentially. The center of the inner cylinder 8 is provided with a central air pipe 13 with its lower end sealed. Several jet holes are provided on the central air pipe 13 at intervals. A spray mechanism is provided in the upper part of the inner cylinder 8. An air outlet is provided in the bottom of the inner cylinder 8. Multiple upper air pipes 14 are provided on the ring plate between the spiral half-pipe 11 and the outermost spiral coil 12 on the inner wall of the shell 7.
[0015] This utility model is used for bypass ventilation in cement kilns. In implementation, a portion of the flue gas from the kiln tail flue chamber 2 is extracted as required, and then the flue gas is sequentially passed through a quench cooler 4, a waste heat boiler 5, and a dust collector 6. The quench cooler 4 is used to rapidly cool the flue gas, reducing its temperature to approximately 200°C. This rapid cooling prevents the formation of dioxins and, through rapid cooling, causes volatile components such as potassium, sodium, chlorine, and sulfur to condense and crystallize quickly, transforming from a gaseous phase to a solid phase, forming tiny particulate matter. Subsequently, the waste heat boiler 5 absorbs the heat from the flue gas, achieving energy savings and avoiding heat loss while facilitating the operation of the subsequent dust collector 6. The dust collector 6 mostly uses bag filters to remove dust and the condensed particulate matter from the flue gas, thereby permanently removing harmful volatile components such as potassium, sodium, chlorine, and sulfur from the kiln system. Finally, the filtered flue gas is passed into the high-temperature zone of the grate cooler 3, utilizing the high-temperature, oxygen-rich environment to thoroughly decompose the odorous components in the flue gas, preventing the flue gas from polluting the environment.
[0016] When the quencher 4 is running, the flue gas drawn from the kiln tail flue chamber 2 is introduced into the inlet chamber 9, and then into the cooling chamber 10 through the upper air pipe 14. A flue gas passage is formed between the spiral half-pipe 11 and the spiral coil 12 in the cooling chamber 10, which allows the flue gas to flow up and down. The flue gas flows up and down in this passage and continuously exchanges heat with the cooling medium in the spiral half-pipe 11 and the spiral coil 12 during the flow. The flue gas temperature drops to about 500°C. Then, it enters the inner cylinder 8 tangentially through the air inlet and forms a vortex. Landfill leachate or domestic sewage is introduced into the spray mechanism. This sewage is sprayed out from the spray mechanism, forming water mist that comes into contact with the flue gas. The water mist mixes evenly and quickly with the swirling flue gas, which cools the flue gas rapidly and evenly. At the same time, odorous gases collected from the landfill and domestic production processes are introduced into the central air pipe 13. Similarly, as the flue gas swirls downward, it mixes evenly and quickly with the odorous gases, accelerating the cooling speed of the flue gas and achieving efficient quenching of the flue gas.
[0017] In operation, this invention utilizes the characteristic that dioxins are easily generated in the temperature range of 250℃ to 450℃ during flue gas cooling. When the flue gas enters the quencher 4, the spiral half-pipe 11 and spiral coil 12 first lower the flue gas temperature to approximately 500℃. Then, leachate and garbage odor are used to rapidly cool the flue gas, reducing the temperature to approximately 200℃ in a very short time. Compared to most current quenchers 4 that directly cool high-temperature flue gas, this invention employs a two-stage cooling structure. In the second stage of quenching, since the first stage has already absorbed a large amount of heat from the flue gas, the amount of heat that needs to be absorbed in the second stage is reduced. This makes it easier for the flue gas temperature to quickly jump over the dioxin synthesis temperature range, preventing sufficient time for dioxin formation and thus curbing dioxin formation at its source. This more effectively ensures the quenching effect of the flue gas and improves the efficiency of flue gas cooling. The flue gas cooling effect is stable. Secondly, during the rapid cooling of the flue gas, on the one hand, the flue gas is in a swirling state, and on the other hand, leachate water mist and garbage odor are simultaneously injected into the flue gas. The flue gas, water mist and odor have a high mixing efficiency, and the three can be mixed efficiently, quickly and evenly, thereby achieving the purpose of rapid cooling of the flue gas. In addition, in this utility model, wastewater such as leachate and garbage odor are used to cool the flue gas, replacing the clean water and air used in the prior art. While achieving rapid cooling of the flue gas, since wastewater and odor are pollution sources that need to be treated, no new pollution sources are added, nor is the amount of pollution sources to be treated increased. Although clean water and air can also rapidly cool the flue gas after being mixed into it, this will undoubtedly greatly increase the amount of flue gas to be treated, thereby increasing the production cost of enterprises. Moreover, this utility model uses a grate cooler 3 to thoroughly decompose and treat the flue gas, eliminating the problem of flue gas pollution to the environment.
[0018] The spraying mechanism includes a ring pipe 15 and an inlet pipe 16 set on the ring pipe 15. Multiple nozzles are evenly distributed around the bottom circumference of the ring pipe 15. In actual use, landfill leachate and various industrial and domestic sewage are introduced into the ring pipe 15 through the inlet pipe 16, and then water mist is sprayed out from the nozzles. In actual use, a corresponding spraying mechanism can also be set according to actual needs to facilitate the full and uniform mixing of water mist and flue gas.
[0019] The upper air pipe 14 is evenly distributed along the circumference of the ring plate and is arranged at an angle along the circumference of the ring plate. The upper air pipe 14 is evenly distributed along the circumference of the ring plate so that the flue gas can enter the cooling chamber 10 evenly. The angled arrangement along the circumference of the slide plate is so that the flue gas can flow spirally after entering the cooling chamber 10, which improves the flue gas flow, increases the heat exchange time between the flue gas and the cooling medium, and ensures the heat exchange effect of the flue gas.
[0020] Both the spiral half-pipe 11 and the spiral coil 12 are provided with spiral heat-conducting plates 17. The spiral heat-conducting plates 17 are made of materials with good thermal conductivity and are provided on the spiral half-pipe 11 and the spiral coil 12 to increase the heat exchange area between the flue gas and the cooling medium, thereby improving the cooling efficiency of the flue gas.
[0021] A temperature sensor 18 is installed at the top of the cooling chamber 10 near the air inlet. In this invention, the flue gas undergoes a first-stage cooling process in the cooling chamber 10 outside the inner cylinder 8, bringing the flue gas temperature down to about 500°C. This ensures a rapid cooling effect for the flue gas in the second stage within the inner cylinder 8. The purpose of installing the temperature sensor 18 is to monitor the flue gas temperature at the air inlet in real time, determine the temperature of the flue gas after the first stage of cooling, and adjust the spray volume of the spray mechanism and the jet volume ejected from the central air pipe 13 accordingly based on the detected flue gas temperature to meet the rapid cooling effect of the flue gas without excessively reducing the flue gas temperature. The heat in the flue gas can be absorbed by the subsequent waste heat boiler 5.
[0022] A heat insulation layer 19 is provided on the outer wall of the inner cylinder 8 inside the air intake chamber 9. When this utility model is in operation, according to the cooling process of the flue gas, the flue gas undergoes the first stage of cooling in the cooling chamber 10 outside the inner cylinder 8, with the aim of reducing the temperature of the flue gas to about 500°C. This cooling process does not require rapid cooling, and the time for cooling the flue gas can be appropriately extended according to the actual situation. The flue gas undergoes the second stage of cooling in the inner cylinder 8, with the aim of rapidly cooling the flue gas, so that the temperature of the flue gas is rapidly cooled to about 200°C within a fraction of a second. It can be seen that the temperature of the flue gas outside the inner cylinder 8 is much higher than that of the flue gas inside the inner cylinder 8, which will cause the problem of heat transfer from the outside to the inside, which will affect the rapid cooling effect of the flue gas inside the inner cylinder 8 to a certain extent. Therefore, the heat insulation layer 19 is set to reduce or even avoid the problem of heat transfer from the outside of the inner cylinder 8 to the inside, ensuring the rapid cooling effect of the flue gas inside the inner cylinder 8.
Claims
1. An energy-saving and environmentally friendly bypass ventilation system for cement kilns, comprising a cement kiln (1) and kiln tail smoke chambers (2) and grate coolers (3) located at both ends of the cement kiln (1), characterized in that: The kiln tail flue (2) is connected in sequence to a quench cooler (4), a waste heat boiler (5), and a dust collector (6) via pipelines. The outlet of the dust collector (6) is connected to the high-temperature area of the grate cooler (3) via pipelines. The quench cooler (4) includes a shell (7) and an inner cylinder (8) set inside the shell (7). The annular space between the shell (7) and the inner cylinder (8) is divided into an air inlet chamber (9) and a cooling chamber (10) from bottom to top by an annular plate. An air inlet is provided on the air inlet chamber (9). Spiral half-pipes (11) are provided on the inner wall of the shell (7) and the outer wall of the inner cylinder (8) in the cooling chamber (10). Multiple spiral coils (12) are arranged concentrically at intervals in the cooling chamber (10). The adjacent tubes of the spiral coils (12) The spiral coils (12) are tightly fitted together. An airflow channel is provided between the upper end of the spiral coil (12) and the top of the quencher (4), and between the lower end of the spiral coil (12) and the ring plate. The airflow channels of two adjacent spiral coils (12) are arranged alternately. An air inlet is provided tangentially on the inner cylinder (8) above the spiral half-pipe (11). A central air pipe (13) with its lower end sealed is provided in the center of the inner cylinder (8). Several jet holes are provided at intervals on the central air pipe (13). A spray mechanism is provided in the upper part of the inner cylinder (8). An air outlet is provided in the bottom of the inner cylinder (8). Multiple upper air pipes (14) are provided on the ring plate between the spiral half-pipe (11) and the outermost spiral coil (12) on the inner wall of the shell (7).
2. The energy-saving and environmentally friendly cement kiln bypass ventilation system according to claim 1, characterized in that: The spraying mechanism includes a ring pipe (15) and an inlet pipe (16) disposed on the ring pipe (15), and multiple nozzles are evenly distributed around the bottom circumference of the ring pipe (15).
3. The energy-saving and environmentally friendly cement kiln bypass ventilation system according to claim 1, characterized in that: The upper air pipe (14) is evenly distributed along the circumference of the ring plate and is arranged obliquely along the circumference of the ring plate.
4. The energy-saving and environmentally friendly cement kiln bypass ventilation system according to claim 1, characterized in that: Both the spiral half-pipe (11) and the spiral coil (12) are provided with spiral heat-conducting plates (17).
5. The energy-saving and environmentally friendly cement kiln bypass ventilation system according to claim 1, characterized in that: A temperature sensor (18) is installed on the top of the cooling chamber (10) near the air inlet.
6. The energy-saving and environmentally friendly cement kiln bypass ventilation system according to claim 1, characterized in that: A heat insulation layer (19) is provided on the outer wall of the inner cylinder (8).