A high-temperature dust removal and hot flue gas remixing system for a rotary kiln for powder calcination
By introducing a gravity settling chamber, a cyclone dust collector, and a high-temperature media filter into the rotary kiln flue gas treatment system, the problems of heat loss and incomplete dust removal in traditional rotary kiln flue gas treatment have been solved, realizing the reuse of flue gas heat and the reduction of energy consumption.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANDONG BAISHICHENG IND TECHNOLOGY CO LTD
- Filing Date
- 2025-09-01
- Publication Date
- 2026-07-31
AI Technical Summary
Traditional rotary kiln flue gas treatment suffers from severe heat loss in high-temperature flue gas, resulting in high energy consumption, large natural gas consumption, and incomplete dust removal, which can easily lead to pipeline blockage.
A high-temperature dust removal and hot flue gas re-mixing system is adopted, including a gravity settling chamber, a cyclone dust collector and a high-temperature media filter. After separating the dust in the flue gas, it is re-mixed into the tail of the rotary kiln to supplement heat, reduce natural gas consumption and prevent pipeline blockage.
It effectively removes dust from flue gas, enables the reuse of flue gas heat, reduces energy consumption and natural gas usage, and prevents pipeline blockage.
Smart Images
Figure CN224580690U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of industrial energy conservation and environmental protection technology, and in particular relates to a high-temperature dust removal and hot flue gas remixing system for a rotary kiln for powder calcination. Background Technology
[0002] Rotary kilns are core equipment in the production of powder products such as titanium dioxide, catalysts, and lithium iron phosphate. The target powder is obtained through high-temperature calcination in the rotary kiln. During the powder production process, a large amount of dust is generated in the flue gas at the kiln head feed inlet. Removing this dust carried by the high-temperature flue gas is a crucial environmental protection step in the powder production process. Traditional rotary kiln flue gas treatment involves naturally cooling the high-temperature flue gas (350-420℃) to below 250℃ through multi-stage settling or cyclone processes, followed by dust removal before venting. This results in significant heat loss from the flue gas, high natural gas consumption at the kiln tail, and high energy consumption. Utility Model Content
[0003] To address the environmental protection and purification of high-temperature flue gas from rotary kilns during powder production and to achieve heat recovery from the flue gas, thereby saving natural gas consumption, this utility model discloses a high-temperature dust removal and hot flue gas remixing system for rotary kilns used in powder calcination. This system can remove dust from the hot flue gas at the kiln head and then recover the heat, thus saving natural gas consumption.
[0004] To achieve the above objectives, the present invention adopts the following technical solution: A high-temperature dust removal and hot flue gas re-blending system for a rotary kiln used in powder calcination includes a rotary kiln, a flue gas distribution valve, a gravity settling chamber, a cyclone dust collector, a high-temperature media filter, a secondary air fan, a burner, a screw conveyor, a cooling kiln, and a primary air fan. The rotary kiln includes a powder collection bin, a kiln head air guide chamber, a feed inlet, a discharge outlet, a primary air inlet, and a secondary air inlet. The flue gas distribution valve is connected to the kiln head air guide chamber. The gravity settling chamber and the gas inlet of the cyclone dust collector are connected to the flue gas distribution valve via pipelines. The outlet of the cyclone dust collector is connected to the gas inlet of the high-temperature media filter via a pipeline. The gas outlet of the high-temperature media filter is connected to the inlet of the secondary air fan via a pipeline. The gas outlet of the secondary air fan is connected to the secondary air inlet. The cooling kiln includes a hot air inlet, a cold air inlet, a cold powder outlet, and a hot air outlet. The hot air inlet is connected to the discharge outlet via a pipeline. The hot air outlet is connected to the air inlet of the primary air fan via a pipeline. The air outlet of the primary air fan is connected to the air inlet of the primary air fan via a pipeline. The burner is located at the kiln tail end of the rotary kiln.
[0005] Furthermore, the gravity settling chamber includes a dust-laden flue gas inlet, a settling flue gas outlet, and a dust outlet. The dust outlet is connected to a screw conveyor via a dust conveying pipe, and the dust-laden flue gas inlet is connected to a flue gas distribution valve via a pipe.
[0006] Furthermore, the cyclone dust collector includes a hot flue gas inlet, a hot flue gas outlet, a cyclone flue gas outlet, and a cyclone dust outlet. The cyclone dust outlet is connected to a screw conveyor via a dust conveying pipe. The hot flue gas inlet is connected to a flue gas distribution valve via a pipe, and the hot flue gas outlet is connected to a screw conveyor via a pipe.
[0007] Furthermore, the high-temperature medium filter includes a flue gas inlet, a clean flue gas outlet, and a dust interception outlet. The dust interception outlet is connected to a screw conveyor via a dust conveying pipe. The flue gas inlet and the cyclone flue gas outlet are connected via a gas pipe. The clean flue gas outlet is connected to a secondary air fan via a gas pipe.
[0008] Furthermore, the cold powder outlet is connected to the screw conveyor via a dust conveying pipe.
[0009] This utility model discloses a high-temperature dust removal and hot flue gas re-mixing system for rotary kilns used in powder calcination. The system distributes the hot flue gas from the kiln head via a flue gas distribution valve. A portion of the hot flue gas is passed through a cyclone dust collector and a high-temperature media dust collector to remove dust. The remaining flue gas undergoes preliminary dust removal via gravity settling before entering the existing flue gas treatment system. The hot flue gas, after dust removal by the high-temperature media dust collector, is re-mixed into the rotary kiln tail via a secondary fan to replenish the kiln's heat and reduce natural gas consumption. The high-temperature media dust collector filters the high-temperature flue gas, resulting in a particulate matter content of less than 10 mg / m³, effectively preventing dust blockage of the pipelines. Attached Figure Description
[0010] Figure 1 This is a schematic diagram of the high-temperature dust removal and hot flue gas remixing system for a rotary kiln used in powder calcination, as described in this utility model.
[0011] Among them, 1-rotary kiln, 2-flue gas distribution valve, 3-gravity settling chamber, 4-cyclone dust collector, 5-high temperature medium filter, 6-secondary air fan, 7-burner, 8-screw conveyor, 9-cooling kiln, 10-primary air fan, 101-powder collection bin, 102-kiln head air guide chamber, 103-feed inlet, 104-discharge outlet, 105-primary air inlet, 106-secondary air inlet, 301-dust flue gas inlet, 302-settling flue gas outlet, 303-dust outlet, 401-hot flue gas inlet, 402-hot flue gas outlet, 403-cyclone flue gas outlet, 404-cyclone dust outlet, 501-flue gas inlet, 502-clean flue gas outlet, 503-intercepted dust outlet, 901-hot air inlet, 902-cold air inlet, 903-cold powder outlet, 904-hot air outlet. Detailed Implementation
[0012] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.
[0013] like Figure 1 As shown, a high-temperature dust removal and hot flue gas recirculation system for a rotary kiln for powder calcination includes a rotary kiln 1, a flue gas distribution valve 2, a gravity settling chamber 3, a cyclone dust collector 4, a high-temperature medium filter 5, a secondary air fan 6, a burner 7, a screw conveyor 8, a cooling kiln 9, and a primary air fan 10. The rotary kiln 1 includes a powder collection bin 101, a kiln head air guide chamber 102, a feed inlet 103, a discharge outlet 104, a primary air inlet 105, and a secondary air inlet 106. The flue gas distribution valve 2 is connected to the kiln head air guide chamber 102. The gas inlets of the gravity settling chamber 3 and the cyclone dust collector 4 are connected to the flue gas distribution valve 2 via pipelines. The outlet of the cyclone dust collector 4 is connected to the high-temperature medium filter 10. The gas inlet of filter 5 is connected to a pipeline, the gas outlet of high-temperature medium filter 5 is connected to the inlet of secondary air fan 6 through a pipeline, the gas outlet of secondary air fan 6 is connected to secondary air inlet 106, the cooling kiln 9 includes hot air inlet 901, cold air inlet 902, cold powder outlet 903 and hot air outlet 904, the hot air inlet 901 is connected to the discharge port 104 through a pipeline, the cold powder outlet 903 is connected to the screw conveyor 8 through a dust conveying pipeline, the hot air outlet 904 is connected to the air inlet of primary air fan 10 through a pipeline, the air outlet of primary air fan 10 is connected to the primary air inlet 105 through a pipeline, and the burner 7 is located at the kiln tail end of rotary kiln 1.
[0014] Specifically, the gravity settling chamber 3 includes a dust-laden flue gas inlet 301, a settling flue gas outlet 302, and a dust outlet 303. The dust outlet 303 is connected to the screw conveyor 8 through a dust conveying pipe, and the dust-laden flue gas inlet 301 is connected to the flue gas distribution valve 2 through a pipe.
[0015] Specifically, the cyclone dust collector 4 includes a hot flue gas inlet 401, a hot flue gas outlet 402, a cyclone flue gas outlet 403, and a cyclone dust outlet 404. The cyclone dust outlet 404 is connected to the screw conveyor 8 through a dust conveying pipe. The hot flue gas inlet 401 is connected to the flue gas distribution valve 2 through a pipe, and the hot flue gas outlet 402 is connected to the screw conveyor 8 through a pipe.
[0016] Specifically, the high-temperature medium filter 5 includes a flue gas inlet 501, a clean flue gas outlet 502, and a dust interception outlet 503. The dust interception outlet 503 is connected to the screw conveyor 8 through a dust conveying pipe. The flue gas inlet 501 and the cyclone flue gas outlet 403 are connected through a gas pipe. The clean flue gas outlet 502 is connected to the secondary fan 6 through a gas pipe.
[0017] Those skilled in the art should understand that the above description is merely a specific embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A high-temperature dust removal and hot flue gas recirculation system for a rotary kiln for powder calcination, characterized in that, The system includes a rotary kiln, a flue gas distribution valve, a gravity settling chamber, a cyclone dust collector, a high-temperature media filter, a secondary air fan, a burner, a screw conveyor, a cooling kiln, and a primary air fan. The rotary kiln includes a powder collection bin, a kiln head air guide chamber, a feed inlet, a discharge outlet, a primary air inlet, and a secondary air inlet. The flue gas distribution valve is connected to the kiln head air guide chamber. The gravity settling chamber and the gas inlet of the cyclone dust collector are connected to the flue gas distribution valve via pipelines. The outlet of the cyclone dust collector is connected to the gas inlet of the high-temperature media filter via a pipeline. The gas outlet of the high-temperature media filter is connected to the inlet of the secondary air fan via a pipeline. The gas outlet of the secondary air fan is connected to the secondary air inlet. The cooling kiln includes a hot air inlet, a cold air inlet, a cold powder outlet, and a hot air outlet. The hot air inlet is connected to the discharge outlet via a pipeline. The hot air outlet is connected to the air inlet of the primary air fan via a pipeline. The air outlet of the primary air fan is connected to the air inlet of the primary air fan via a pipeline. The burner is located at the kiln tail end of the rotary kiln.
2. The high-temperature dust removal and hot flue gas recirculation system for a rotary kiln for powder calcination according to claim 1, characterized in that, The gravity settling chamber includes a dust-laden flue gas inlet, a settling flue gas outlet, and a dust outlet. The dust outlet is connected to a screw conveyor via a dust conveying pipe, and the dust-laden flue gas inlet is connected to a flue gas distribution valve via a pipe.
3. The high-temperature dust removal and hot flue gas recirculation system for a rotary kiln for powder calcination according to claim 1, characterized in that, The cyclone dust collector includes a hot flue gas inlet, a hot flue gas outlet, a cyclone flue gas outlet, and a cyclone dust outlet. The cyclone dust outlet is connected to a screw conveyor via a dust conveying pipe. The hot flue gas inlet is connected to a flue gas distribution valve via a pipe, and the hot flue gas outlet is connected to the screw conveyor via a pipe.
4. A high-temperature dust removal and hot flue gas recirculation system for a rotary kiln for powder calcination according to claim 1, characterized in that, The high-temperature medium filter includes a flue gas inlet, a clean flue gas outlet, and a dust interception outlet. The dust interception outlet is connected to a screw conveyor via a dust conveying pipe. The flue gas inlet and the cyclone flue gas outlet are connected via a gas pipe. The clean flue gas outlet is connected to a secondary fan via a gas pipe.
5. A high-temperature dust removal and hot flue gas recirculation system for a rotary kiln for powder calcination according to claim 1, characterized in that, The cold powder outlet is connected to the screw conveyor via a dust conveying pipe.