Energy-saving preheater resistance reduction retrofit device
By optimizing the preheater design through a funnel-shaped connection port, a multi-stage preheating mechanism, and a smooth inclined surface structure, the problem of high resistance in traditional preheaters is solved, achieving energy saving and consumption reduction, uniform material dispersion, and improved preheating efficiency and heat exchange effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JUXIAN ZHONGLIAN CEMENT CO LTD
- Filing Date
- 2025-04-29
- Publication Date
- 2026-06-02
AI Technical Summary
The internal structure of traditional preheaters results in high system resistance, obstructed airflow and ventilation, increased energy consumption, and uneven material dispersion, which affects the heat exchange effect.
The design incorporates a funnel-shaped connection port, a multi-stage preheating mechanism, and a smooth inclined surface structure to increase the flow area and reduce local resistance. The multi-stage cyclone separator enables the material to flow in the opposite direction to the hot airflow, while a flap valve prevents airflow turbulence. The material is evenly dispersed by the feeding box.
It significantly reduces system energy consumption, improves preheating efficiency, ensures uniform material dispersion, extends heat exchange time, reduces local airflow resistance, and guarantees normal system operation.
Smart Images
Figure CN224316747U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of thermal energy engineering technology, and in particular to an energy-saving preheater resistance reduction retrofit device. Background Technology
[0002] In the cement production sector, the efficiency and energy consumption of clinker production have always been the focus of industry attention. As a key piece of equipment in the cement production process, the performance of the preheater directly affects the energy consumption, output, and economic benefits of the entire production line. With the development of the cement industry, optimizing and upgrading the preheater system has become an important way to achieve efficient and energy-saving production.
[0003] Traditional preheaters suffer from several problems. First, their internal structure leads to high system resistance. The constricted area of the flue gas chamber is prone to crusting, further reducing the effective ventilation area and obstructing airflow, thus increasing system resistance. Second, the excessively large bends in the hot air ducts at each stage of the preheater cause a sudden change in airflow direction, generating significant local resistance and increasing the overall system resistance. Third, the excessively large bends at the outlet of the decomposition furnace result in pressure losses exceeding 500 Pa. This significant pressure loss not only increases system energy consumption but also affects airflow distribution and material reaction within the decomposition furnace. Fourth, the initially configured feeding boxes at each stage have poor feeding performance, resulting in uneven material dispersion and significantly reduced solid-gas heat exchange efficiency. Ultimately, these issues contribute to high system resistance within the preheater and excessive energy consumption.
[0004] Therefore, there is an urgent need to provide an energy-saving preheater resistance reduction retrofit device to solve the above problems. Utility Model Content
[0005] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide an energy-saving preheater resistance reduction retrofit device.
[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: providing an energy-saving preheater resistance reduction retrofit device, including a tower body, a rotary kiln installed at the bottom of the tower body, a smoke chamber installed at one end of the rotary kiln, a connection port fixedly connected to the top of the smoke chamber, a decomposition furnace installed at the top of the connection port, a powder silo installed at the top of the decomposition furnace, a conveying pipe fixedly connected between the powder silo and the decomposition furnace, a feeding fan installed at the top of the decomposition furnace, a first feed pipe fixedly connected to the rear end of the powder silo, and a multi-stage preheating mechanism provided inside the tower body, with two second feed pipes, one exhaust pipe and two air inlet pipes respectively installed at the top of the multi-stage preheating mechanism.
[0007] The present invention is further configured such that the interfaces between the smoke chamber and the decomposition furnace are both enlarged.
[0008] The above technical solution increases the flow area at the interface by expanding the diameter, allowing the airflow to pass more smoothly from the smoke chamber into the decomposition furnace, reducing the resistance caused by the narrow channel and lowering the system's energy consumption.
[0009] The present invention is further configured such that the connection port is generally funnel-shaped, gradually widening from the smoke chamber toward the decomposition furnace.
[0010] Through the above technical solution, the flared connection provides a gradually expanding channel for airflow. This design conforms to the principles of fluid mechanics. When the airflow flows in the expanding channel, its speed will gradually decrease and the pressure change will be more gradual, thereby effectively reducing the local resistance caused by the sudden change in the flow cross section.
[0011] The present invention is further configured such that: the multi-stage preheating mechanism includes multiple cyclones installed inside the tower body, each of the multiple cyclones having a feed inlet and an air outlet at its top, and an air inlet on its outer wall; a first discharge pipe and a first connecting pipe are fixedly connected between adjacent cyclones; a material distribution box is installed at the bottom of each of the two cyclones, and a second discharge pipe is fixedly connected to the bottom of each of the two material distribution boxes; a shoulder connecting pipe and a third connecting pipe are fixedly connected between each of the two cyclones and the decomposition furnace; and a second air inlet is provided on the outer wall of each of the two cyclones.
[0012] Through the above technical solution, raw materials enter the uppermost cyclone of the multi-stage preheating mechanism through the second feed pipe, while the dust-laden airflow enters the uppermost cyclone through the air inlet pipe. Inside the cyclone, the airflow rotates at high speed. Due to centrifugal force, material particles are thrown against the cylinder wall and fall down along it, while the hot airflow carries some fine particles upward and exits from the outlet. During this process, the material and the hot airflow come into full contact and exchange heat, causing the material temperature to rise and the hot airflow temperature to drop. The material then enters the feed inlet of the next-stage cyclone through the first feed pipe. The inlet of the next-stage cyclone is connected to the outlet of the previous-stage cyclone through the first connecting pipe, allowing the hot airflow to pass through each stage of the cyclone sequentially. In this way, the material... The material falls sequentially through each stage of the cyclone separator, while the hot air rises sequentially, achieving multi-stage preheating. When the material enters the bottom of the cyclone separator equipped with a spreading box, the spreading box evenly disperses the material. By moving the spreading box downwards, the heat exchange time of the material is extended without causing short circuits. The dispersed material continues to be transferred downwards through the second discharge pipe. One of the cyclone separators is connected to the decomposition furnace through a shoulder connecting pipe and a third connecting pipe. After multi-stage preheating, the material enters the decomposition furnace through these connecting pipes. At the same time, the hot air also enters the decomposition furnace through the connecting pipes, providing heat for the decomposition reaction inside the decomposition furnace. Inside the decomposition furnace, the material undergoes a decomposition reaction under high temperature and suitable atmosphere conditions to generate intermediate products, preparing for subsequent calcination in the rotary kiln.
[0013] The present invention is further configured such that the connection between the shoulder connecting tube and the cyclone tube is configured as a smooth inclined surface structure.
[0014] Through the above technical solution, the smooth inclined surface structure provides a smooth transition channel for airflow. Compared with right angle or irregular connection structure, when airflow flows on the smooth inclined surface, its direction changes more gently, reducing sudden changes and collisions in airflow, thereby significantly reducing the local resistance of airflow at the connection point.
[0015] The present invention is further configured such that a flap valve is provided inside each of the multiple first feeding pipes, second feeding pipes and third connecting pipes.
[0016] The above technical solution effectively prevents airflow backflow by setting up a flap valve. When the airflow pressure in a cyclone or decomposition furnace changes, the flap valve will close quickly to prevent airflow from flowing in reverse, avoid airflow turbulence from adversely affecting material conveying and system operation, and maintain the normal flow direction and pressure balance of airflow in the system.
[0017] The present invention is further configured such that: the material dispensing box is funnel-shaped, with multiple evenly distributed discharge ports at the bottom and the sides are inclined.
[0018] The above technical solution allows for the uniform distribution of materials through multiple evenly distributed discharge ports at the bottom, preventing local material accumulation or uneven distribution caused by concentrated feeding. This facilitates full reaction and heat exchange of subsequent materials in the decomposition furnace or other equipment.
[0019] The beneficial effects of this utility model are as follows:
[0020] 1. This utility model designs a multi-stage preheating mechanism, which connects multiple cyclones in series and allows materials and hot air to flow in opposite directions, thus fully exchanging heat and significantly improving preheating efficiency. This provides materials at suitable temperatures for the decomposition furnace and rotary kiln, reducing system energy consumption.
[0021] 2. This utility model provides a smooth transition channel for airflow by setting a smooth inclined surface structure at the junction of the decomposition furnace and the cyclone. Compared with right angle or irregular connection structure, the change of airflow direction is more gradual when the airflow flows on the smooth inclined surface, which reduces the sudden turning and collision of airflow and the expansion of area, thereby significantly reducing the local resistance of airflow at the junction. Attached Figure Description
[0022] Figure 1 This is a perspective view of the present utility model;
[0023] Figure 2 for Figure 1 A cross-sectional view;
[0024] Figure 3 This is a schematic diagram of the feeding blower structure of this utility model;
[0025] Figure 4 This is a schematic diagram of the multi-stage preheating mechanism of this utility model;
[0026] Figure 5 This is a schematic diagram of the second air inlet structure of this utility model.
[0027] In the diagram: 1. Tower body; 2. Rotary kiln; 3. Smoke chamber; 4. Connection port; 5. Decomposition furnace; 6. Powder silo; 7. Conveying pipe; 8. Feeding fan; 9. First feed pipe; 10. Multi-stage preheating mechanism; 1001. Cyclone separator; 1002. Feed inlet; 1003. Air outlet; 1004. Air inlet; 1005. First discharge pipe; 1006. First connecting pipe; 1007. Spreading box; 1008. Second discharge pipe; 1009. Shoulder connecting pipe; 1010. Third connecting pipe; 1011. Second air inlet; 11. Second feed pipe; 12. Exhaust pipe; 13. Air inlet pipe. Detailed Implementation
[0028] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the scope of protection of the present invention.
[0029] Please see Figure 1 - Figure 3 An energy-saving preheater drag reduction retrofit device includes a tower body 1. A rotary kiln 2 is installed near the bottom of the tower body 1. A smoke chamber 3 is installed at one end of the rotary kiln 2. A connection port 4 is fixedly connected to the top of the smoke chamber 3. The connection port 4 is funnel-shaped, gradually widening from the smoke chamber 3 towards the decomposition furnace 5. The funnel-shaped connection port 4 provides a gradually expanding channel for airflow. This design conforms to fluid mechanics principles; as the airflow flows in the expanding channel, its velocity gradually decreases, and the pressure change becomes more gradual, effectively reducing the impact of sudden changes in airflow. The local resistance generated by the flow cross section, the top of the connection port 4 is equipped with a decomposition furnace 5, and the corresponding interfaces of the smoke chamber 3 and the decomposition furnace 5 are all enlarged. The enlarged diameter increases the flow area at the interface, and the airflow can pass more smoothly when it enters the decomposition furnace 5 from the smoke chamber 3, reducing the resistance caused by the narrow channel and reducing the energy consumption of the system. The top of the decomposition furnace 5 is equipped with a powder silo 6, and a conveying pipe 7 is fixedly connected between the powder silo 6 and the decomposition furnace 5. The top of the decomposition furnace 5 is equipped with a feeding fan 8, and the rear end of the powder silo 6 is fixedly connected with a first feed pipe 9.
[0030] like Figure 4 and Figure 5As shown, the tower body 1 is equipped with a multi-stage preheating mechanism 10. The multi-stage preheating mechanism 10 includes multiple cyclone cylinders 1001 installed inside the tower body 1. Each cyclone cylinder 1001 has a feed inlet 1002 and an air outlet 1003 at its top, and an air inlet 1004 on its outer wall. A first discharge pipe 1005 and a first connecting pipe 1006 are fixedly connected between each adjacent cyclone cylinder 1001. A material distribution box 10 is installed at the bottom of each cyclone cylinder 1001. 07. The material dispensing box 1007 is funnel-shaped, with multiple evenly distributed discharge ports at the bottom and inclined sides. These evenly distributed ports ensure uniform material distribution, preventing localized material accumulation or uneven distribution caused by concentrated feeding. This facilitates full reaction and heat exchange of the material in the decomposition furnace 5 or other equipment. A second discharge pipe 1008 is fixedly connected to the bottom of each of the two material dispensing boxes 1007. Shoulder connecting pipes 1009 and the second discharge pipe 1008 are fixedly connected to both cyclones 1001 and the decomposition furnace 5, respectively. The three connecting pipes 1010, multiple first discharge pipes 1005, second discharge pipes 1008, and third connecting pipe 1010 are all equipped with flap valves. These flap valves effectively prevent backflow of air. When the airflow pressure changes in a cyclone 1001 or the decomposition furnace 5, the flap valves quickly close to prevent reverse airflow, avoiding adverse effects of airflow turbulence on material conveying and system operation, and maintaining the normal flow direction and pressure balance of the airflow within the system. The shoulder connecting pipe 1009 connects to the cyclone 1001. The structure is designed as a smooth inclined surface, which provides a smooth transition channel for airflow. Compared with right angle or irregular connection structure, the change of airflow direction is more gradual when the airflow flows on the smooth inclined surface, reducing sudden changes and collisions in airflow, thereby significantly reducing the local resistance of airflow at the connection point. The outer walls of the two cyclone tubes 1001 are provided with second air inlets 1011, and the top of the multi-stage preheating mechanism 10 is respectively equipped with two second feed pipes 11, one exhaust pipe 12 and two air inlets 13.
[0031] like Figure 4 and Figure 5As shown, raw materials enter the uppermost cyclone 1001 of the multi-stage preheating mechanism 10 through the second feed pipe 11, while the dust-laden airflow enters the uppermost cyclone 1001 through the air inlet pipe 13. Inside the cyclone 1001, the airflow rotates at high speed. Due to centrifugal force, material particles are thrown against the cylinder wall and fall down along it, while the hot airflow carries some fine particles upward and exits from the air outlet 1003. During this process, the material and the hot airflow come into full contact and exchange heat, causing the material temperature to rise and the hot airflow temperature to drop. The material then enters the feed inlet 1002 of the next-stage cyclone 1001 through the first discharge pipe 1005. The air inlet 1004 of the next-stage cyclone 1001 is connected to the air outlet 1003 of the previous-stage cyclone 1001 through the first connecting pipe 1006, allowing the hot airflow to pass through each stage of the cyclone 1001 sequentially. In this way, the material falls sequentially in each stage of the cyclone 1001, while the hot air rises sequentially, achieving multi-stage preheating. When the material enters the bottom of the cyclone 1001 equipped with the spreading box 1007, the spreading box 1007 evenly disperses the material. By moving the spreading box 1007 downward, the heat exchange time of the material is extended without causing material short circuit. The dispersed material continues to be transferred downward through the second feeding pipe 1008. One of the cyclone 1001 is connected to the decomposition furnace 5 through the shoulder connecting pipe 1009 and the third connecting pipe 1010. After multi-stage preheating, the material enters the decomposition furnace 5 through these connecting pipes. At the same time, the hot air also enters the decomposition furnace 5 through the connecting pipes, providing heat for the decomposition reaction in the decomposition furnace 5. In the decomposition furnace 5, the material undergoes a decomposition reaction under high temperature and suitable atmosphere conditions to generate intermediate products, preparing for subsequent calcination in the rotary kiln 2.
[0032] In use, raw material enters the cyclone 1001 at the top of the multi-stage preheating mechanism 10 through the second feed pipe 11 and the feed port 1002. Dust-laden airflow enters simultaneously through the air inlet pipe 13 and the second air inlet 1011. Inside the cyclone 1001, preliminary gas-solid separation is achieved by centrifugal force. After sufficient heat exchange between the material and the hot airflow, the material enters the lower-stage cyclone 1001 through the first discharge pipe 1005. The hot airflow enters the air inlet 1004 of the lower-stage cyclone 1001 through the first connecting pipe 1006, achieving multi-stage preheating. When the material reaches the bottom of the cyclone 1001 equipped with the spreading box 1007, the funnel-shaped spreading box 1007 evenly disperses the material through multiple discharge ports. By moving the spreading box 1007 downward, the heat exchange time of the material can be extended, and the dispersed material... The material continues to flow downwards through the second feed pipe 1008, and the inlet corner of the cyclone 1001 is flattened to reduce system resistance. After multi-stage preheating, the material enters the decomposition furnace 5 through the shoulder connecting pipe 1009 and the third connecting pipe 1010. At the same time, the hot airflow also enters. Meanwhile, the powder silo 6 continuously replenishes the internal coal powder into the decomposition furnace 5 through the first feed pipe 9 and the feeding fan 8 to provide heat for the decomposition reaction. The enlarged diameter of the interface between the smoke chamber 3 and the decomposition furnace 5, the trumpet-shaped design of the connection port 4, and the smooth inclined structure of the shoulder connecting pipe 1009 all reduce airflow resistance and ensure that the airflow enters the decomposition furnace 5 smoothly. The material completes the decomposition reaction in the decomposition furnace 5 to generate intermediate products, which then enter the rotary kiln 2 for calcination. Finally, the rising hot airflow is discharged through the exhaust pipe 12.
[0033] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.
Claims
1. An energy-saving preheater resistance reduction retrofit device, comprising a tower body (1), characterized in that: A rotary kiln (2) is installed at the bottom of the tower body (1). A smoke chamber (3) is installed at one end of the rotary kiln (2). A connection port (4) is fixedly connected to the top of the smoke chamber (3). A decomposition furnace (5) is installed on the top of the connection port (4). A powder silo (6) is installed on the top of the decomposition furnace (5). A conveying pipe (7) is fixedly connected between the powder silo (6) and the decomposition furnace (5). A feeding fan (8) is installed on the top of the decomposition furnace (5). A first feed pipe (9) is fixedly connected to the rear end of the powder silo (6). A multi-stage preheating mechanism (10) is provided inside the tower body (1). Two second feed pipes (11), one exhaust pipe (12), and two air inlet pipes (13) are respectively installed on the top of the multi-stage preheating mechanism (10).
2. The energy-saving preheater resistance reduction retrofit device according to claim 1, characterized in that: The interfaces between the smoke chamber (3) and the decomposition furnace (5) are all enlarged.
3. The energy-saving preheater resistance reduction retrofit device according to claim 2, characterized in that: The connection port (4) is generally funnel-shaped, gradually expanding from the smoke chamber (3) toward the decomposition furnace (5).
4. The energy-saving preheater resistance reduction retrofit device according to claim 1, characterized in that: The multi-stage preheating mechanism (10) includes multiple cyclone tubes (1001) installed inside the tower body (1). Each of the multiple cyclone tubes (1001) has a feed inlet (1002) and an air outlet (1003) at its top. Each of the multiple cyclone tubes (1001) has an air inlet (1004) on its outer wall. A first discharge pipe (1005) and a first connecting pipe (1006) are fixedly connected between each two adjacent cyclone tubes (1001). The bottom of each of the two cyclone tubes (1001) is equipped with a material spreading box (1007), and the bottom of each of the two material spreading boxes (1007) is fixedly connected with a second material discharge pipe (1008). The two cyclone tubes (1001) and the decomposition furnace (5) are respectively fixedly connected with a shoulder connecting pipe (1009) and a third connecting pipe (1010). The outer wall of each of the two cyclone tubes (1001) is provided with a second air inlet (1011).
5. The energy-saving preheater resistance reduction retrofit device according to claim 4, characterized in that: The connection between the shoulder connecting tube (1009) and the cyclone tube (1001) is designed with a smooth inclined surface structure.
6. The energy-saving preheater resistance reduction retrofit device according to claim 4, characterized in that: Each of the first discharge pipe (1005), the second discharge pipe (1008), and the third connecting pipe (1010) is equipped with a flap valve.
7. The energy-saving preheater resistance reduction retrofit device according to claim 4, characterized in that: The material dispensing box (1007) is funnel-shaped, with multiple evenly distributed discharge ports at its bottom and inclined sides.