A high-efficiency stable rotary kiln full combustion device

Abstract

The utility model relates to rotary kiln technical field, and disclose a kind of high-efficiency stable rotary kiln complete combustion device, including rotary kiln body and heat exchanger, the rotary kiln body end side is equipped with smoke collecting box, the smoke collecting box is connected with smoke exhaust cover, the smoke exhaust cover is connected with smoke exhaust pipe, the heat exchanger end side is connected with air inlet pipe, filter assembly is installed between the heat exchanger and smoke exhaust pipe, the filter assembly includes the mounting bracket fixed on the heat exchanger, the mounting bracket is fixed with processing box, cleaning assembly is installed in the processing box.The utility model can be fully transferred to the heat contained in flue gas to the medium to be heated by heat exchanger to clean high-temperature flue gas after filtration for efficient waste heat recovery, thereby reducing the fuel consumption of rotary kiln burner, ensuring that burner is in efficient operation state, this design reduces the heat waste of high-temperature flue gas, improves the energy utilization efficiency of entire device, effectively reduces production operation cost.

Description

Technical Field

[0001] This utility model relates to the field of rotary kiln technology, specifically to a highly efficient and stable rotary kiln combustion device. Background Technology

[0002] A rotary kiln is a continuously operating high-temperature kiln. The kiln body is a steel cylinder lined with refractory material, which lies obliquely on steel support rollers and rotates slowly around the axis. Fuel is injected into the kiln from the lower end along with air and burns, while exhaust gas is discharged from the other end. The raw materials move slowly in the opposite direction and are gradually burned and discharged.

[0003] In industrial production, rotary kilns, as a commonly used thermal equipment, are widely used in industries such as building materials, metallurgy, and chemicals, mainly for completing processes such as calcination and roasting of materials. During the operation of a rotary kiln, its combustion system generates a large amount of high-temperature flue gas. If this flue gas is directly emitted, it will not only cause serious heat waste, but may also pollute the environment due to impurities such as dust and unburned material residue.

[0004] Currently, most existing equipment only treats flue gas by simple filtration or cooling, and then directly discharges the flue gas after treatment. It fails to effectively recover and utilize the large amount of heat contained in the high-temperature flue gas, resulting in a large loss of heat in the flue gas during the emission process. This not only requires additional energy investment in production to drive heating equipment to meet the needs of hot water or material preheating, but also further increases the load and energy consumption of the rotary kiln burner.

[0005] Therefore, we propose a highly efficient and stable rotary kiln combustion device to solve the problems mentioned above. Utility Model Content

[0006] The purpose of this invention is to provide a highly efficient and stable rotary kiln combustion device to solve the problem mentioned in the background art that existing devices are unable to effectively recover and utilize the large amount of heat contained in high-temperature flue gas.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a highly efficient and stable rotary kiln combustion device, comprising a rotary kiln body and a heat exchanger, wherein a smoke collection box is installed on the end side of the rotary kiln body, a smoke exhaust hood is connected to the smoke collection box, and a smoke exhaust pipe is connected to the smoke exhaust hood; An air inlet pipe is connected to one end of the heat exchanger. A filter assembly is installed between the heat exchanger and the exhaust pipe. The filter assembly includes a mounting bracket fixed on the heat exchanger. A treatment box is fixed on the mounting bracket. The two ends of the treatment box are respectively connected to the exhaust pipe and the air inlet pipe. A cleaning component is installed inside the treatment box.

[0008] Preferably, a partition is fixed inside the processing box, and the processing box is divided into a first channel and a second channel. A motor is fixed on the processing box, and a rotating rod is fixed to the output end of the motor. The rotating rod is rotatably connected to the processing box, and an L-shaped baffle is fixedly sleeved on the rotating rod. Multiple filter plates are installed inside the processing box.

[0009] Preferably, there are two L-shaped baffles, which rotate synchronously, with one side of each L-shaped baffle fitting against the inner wall of the processing box.

[0010] Preferably, the filter plates are arranged at an angle, and multiple filter plates are arranged in a linear array, with the inner pore diameter of the filter plates decreasing in a descending order.

[0011] Preferably, the cleaning assembly includes a mounting platform fixed on the heat exchanger, an air tank fixed on the mounting platform, an air cylinder connected to the side wall of the air tank, a fixing frame fixed on the mounting frame, an electric actuator fixed inside the fixing frame, a piston fixed to the output end of the electric actuator, a sealing plug installed on the end side of the air cylinder, and the electric actuator slidably connected to the sealing plug.

[0012] Preferably, the gas storage tank is connected to a gas outlet pipe, a control valve is installed on the gas outlet pipe, two branch pipes are connected to one end of the gas outlet pipe, multiple branch pipes are connected to one end of the two branch pipes, and multiple pulse nozzles are connected to the multiple branch pipes.

[0013] Compared with the prior art, the beneficial effects of this utility model are: 1. This device efficiently recovers waste heat from filtered, clean, high-temperature flue gas via a heat exchanger. It effectively transfers the heat contained in the flue gas to the medium being heated. On one hand, it precisely heats process water and cleaning water to the required production temperature, directly meeting the hot water needs of the production process without requiring additional energy to drive heating equipment, thus reducing extra energy consumption. On the other hand, it preheats the raw materials entering the rotary kiln, reducing the temperature rise load after the raw materials enter the kiln, thereby reducing the fuel consumption of the rotary kiln burner and ensuring that the burner operates at high efficiency. This design reduces heat waste from high-temperature flue gas, improves the energy efficiency of the entire device, effectively reduces production and operating costs, and provides core support for the efficient operation of the device.

[0014] 2. This device, through its dual-channel design and gradient filter plate structure within the treatment chamber, achieves graded deep filtration of impurities of different particle sizes in the flue gas. Large-pore filter plates prioritize intercepting large dust particles and lumpy unburned material residues, while small-pore filter plates precisely capture fine dust particles, ensuring that all types of impurities are efficiently intercepted and prevented from entering the heat exchanger. This design prevents the heat exchanger tubes from becoming clogged with impurities, ensuring the long-term stable heat exchange function of the heat exchanger and extending its service life, thus laying a solid foundation for the overall stable operation of the device.

[0015] 3. The dual channels within the processing chamber of this device can be used alternately through synchronous switching of L-shaped baffles. When the filter plate in one channel needs cleaning due to impurity accumulation, the other channel can immediately take over the flue gas filtration task, maintaining the continuity of the flue gas treatment process without interrupting the operation of the entire device. This design solves the problem of device shutdown caused by blockage of a single channel, effectively ensuring the continuous operation of the entire rotary kiln combustion device, avoiding efficiency losses caused by production interruptions, and further enhancing the device's advantages of high-efficiency and stable operation.

[0016] 4. The cleaning components equipped in this device can efficiently clean filter plates with clogged channels without affecting the normal operation of the device. High-pressure pulsed airflow quickly blows away stubborn impurities adhering to the filter plate surface, which are then smoothly discharged through the open material outlet, rapidly restoring the filter plate's filtration performance. Simultaneously, when cleaning is not required, the electric actuator drives the piston to reciprocate within the air cylinder, continuously replenishing pressure to the air tank and ensuring a sufficient and stable high-pressure air source for subsequent cleaning, guaranteeing effective cleaning. This design extends the overall service life of the filter plates, reduces the frequency of filter plate replacement, further lowers equipment maintenance costs, and provides a reliable guarantee for the long-term, efficient, and stable operation of the device. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the overall three-dimensional structure of the present invention. Figure 2 ; Figure 3 This is a schematic diagram of the heat exchanger, filter assembly, and cleaning assembly of this utility model; Figure 4 For the present utility model Figure 3 Partial sectional view of the structure; Figure 5 This is a schematic cross-sectional view of the processing box of this utility model; Figure 6 This is a schematic diagram of the structure of the filter assembly and cleaning assembly of this utility model.

[0018] In the diagram: 1. Rotary kiln body; 2. Smoke collection box; 3. Smoke hood; 4. Smoke exhaust pipe; 5. Heat exchanger; 6. Air inlet pipe; 7. Filter assembly; 71. Mounting frame; 72. Processing box; 73. Baffle plate; 74. Channel 1; 75. Channel 2; 76. Motor; 77. Rotating rod; 78. L-shaped baffle; 79. Filter plate; 8. Cleaning assembly; 81. Mounting platform; 82. Air storage tank; 83. Air cylinder; 84. Fixing frame; 85. Electric actuator; 851. Sealing plug; 86. Piston; 87. Air outlet pipe; 88. Control valve; 89. Branch pipe; 810. Branch pipe; 811. Pulse nozzle. Detailed Implementation

[0019] 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. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Example 1: Please refer to Figure 1 - Figure 6 A highly efficient and stable rotary kiln combustion device includes a rotary kiln body 1 and a heat exchanger 5. A smoke collection box 2 is installed on the end side of the rotary kiln body 1. A smoke exhaust hood 3 is connected to the smoke collection box 2, and a smoke exhaust pipe 4 is connected to the smoke exhaust hood 3.

[0021] The heat exchanger 5 is connected to the inlet pipe 6 at one end. A filter assembly 7 is installed between the heat exchanger 5 and the exhaust pipe 4. The filter assembly 7 includes a mounting bracket 71 fixed on the heat exchanger 5. A processing box 72 is fixed on the mounting bracket 71. The bottom surface of the processing box 72 is provided with a slag outlet. The design of the slag outlet is existing technology and is not the main innovation of this device, so it will not be described in detail. The slag outlet is always in a closed state to ensure that the flue gas can completely flow through the filter plate 79 to complete the purification and prevent unfiltered flue gas from leaking from the slag outlet, thus ensuring the filtration effect and operational safety. The two ends of the processing box 72 are connected to the exhaust pipe 4 and the inlet pipe 6, respectively. A cleaning assembly 8 is installed inside the processing box 72.

[0022] A partition 73 is fixed inside the treatment box 72, dividing the interior of the treatment box 72 into two channels 74 and 75. The partition 73 is made of high-temperature and corrosion-resistant material, and its height is adapted to the height of the inner wall of the treatment box 72, which can evenly divide the internal space of the treatment box 72 into two independent channels 74 and 75. A motor 76 is fixed on the treatment box 72, and a rotating rod 77 is fixed to the output end of the motor 76. The rotating rod 77 is rotatably connected to the treatment box 72. A high-temperature resistant sealed bearing is installed at the rotatable connection between the rotating rod 77 and the treatment box 72, which can reduce rotational friction loss and prevent flue gas from leaking from the gaps. An L-shaped baffle 78 is fixedly sleeved on the rotating rod 77. Multiple filter plates 79 are installed inside the treatment box 72.

[0023] Two L-shaped baffles 78 are provided, and the two L-shaped baffles 78 rotate synchronously. One side of the L-shaped baffle 78 is in contact with the inner wall of the processing box 72, and the edge of the L-shaped baffle 78 is affixed with a high-temperature resistant sealing strip. When the motor 76 drives the rotating rod 77 to rotate, the two L-shaped baffles 78 rotate synchronously. If it is necessary to activate channel one 74 and close channel two 75, the baffle will rotate to the position of contacting the inner wall of channel two 75, blocking the flue gas passage of channel two 75, while keeping channel one 74 unobstructed. Conversely, when it rotates to the position of contacting the inner wall of channel one 74, it can switch to channel two 75 operation. This design ensures that there is no flue gas crossflow when switching channels, avoids unfiltered flue gas from mixing with filtered flue gas, and ensures the filtration effect.

[0024] The filter plates 79 are arranged at an angle. This design serves two purposes: first, it extends the path of the flue gas through the filter plates 79, allowing for full contact between the flue gas and the filter plates 79, thus improving impurity interception efficiency; second, it utilizes gravity to allow some impurities adhering to the surface of the filter plates 79 to naturally slide to the bottom of the treatment box 72, reducing the accumulation rate of impurities. Multiple filter plates 79 are arranged in a linear array, with the pore size of the filter plates 79 decreasing in that order. The linear array distribution of the filter plates 79 and the decreasing pore size along the flue gas flow direction form a gradient filtration system. The large-pore filter plates 79 at the inlet first intercept larger diameter impurities, the middle layer filter plates 79 intercept medium-sized impurities, and the small-pore filter plates 79 at the outlet intercept tiny impurities. This layered interception prevents tiny impurities from directly clogging the small-pore filter plates 79, extending the overall service life of the filter plates 79, while also improving filtration accuracy, ensuring that the flue gas entering the heat exchanger 5 meets cleanliness requirements, and preventing blockage of the heat exchanger tubes in the heat exchanger 5.

[0025] In this embodiment: During operation, the rotary kiln body 1 continuously generates high-temperature flue gas. This flue gas is first collected by the pre-set smoke collection box 2 on its end side, and then directed into the smoke exhaust pipe 4 through the smoke exhaust hood 3 connected to the top of the smoke collection box 2, forming a complete link of collection and transportation, realizing the initial collection and stable transportation of flue gas.

[0026] The exhaust pipe 4 precisely guides the high-temperature flue gas into the treatment box 72. The treatment box 72 is divided into two independent channels, channel one 74 and channel two 75, by the built-in fixed partition 73. At the same time, multiple inclined filter plates 79 are linearly arrayed in both channels, and the pore size of the filter plates 79 is arranged in a gradient decreasing direction along the flue gas flow direction.

[0027] During the initial startup of the device, channel 74 is opened first as the main flue gas filtration channel. When the flue gas flows through the filter plates 79 of channel 74, the filter plates 79, with their decreasing pore sizes, can progressively intercept impurities of different particle sizes in the flue gas. The large-pore filter plates 79 first capture large dust particles and lumpy unburned material residues, while the small-pore filter plates 79 then filter fine dust and tiny impurities, achieving graded deep filtration of the flue gas. This effectively prevents impurities from entering the subsequent heat exchanger 5 with the flue gas, causing equipment blockage, reduced heat exchange efficiency, or component damage. During this filtration process, the slag outlet at the bottom of the treatment box 72 remains sealed to ensure that the flue gas can completely flow through the filter plates 79 for purification, preventing unfiltered flue gas from leaking from the slag outlet and ensuring filtration effectiveness and operational safety.

[0028] After channel 1 74 has been running for a period of time, the impurities attached to the surface of filter plate 79 gradually increase. If blockage occurs and the resistance to flue gas flow increases, the device will automatically switch to channel 2 75. The L-shaped baffle 78 is rotated to block channel 1 74 and open channel 2 75. At this time, the high-temperature flue gas will continue to be filtered by the filter plate 79 of channel 2 75. The continuous flue gas treatment can be maintained without stopping the machine, and the machine shutdown problem caused by blockage of a single channel can be completely avoided.

[0029] Regardless of whether the flue gas is filtered through channel 1 (74) or channel 2 (75), the purified, high-temperature flue gas enters the heat exchanger 5 through the sealed connection between the treatment box 72 and the inlet pipe 6 of the heat exchanger 5. The heat exchanger 5 utilizes the waste heat of the high-temperature flue gas for heat exchange, efficiently transferring heat to the medium to be heated: on the one hand, it can heat the process water and cleaning water to the required production temperature, directly meeting the hot water demand of the production process; on the other hand, it can preheat the raw materials entering the rotary kiln, reducing the temperature rise load after the raw materials enter the kiln and reducing the fuel consumption of the rotary kiln burner. Through this waste heat recovery process, not only is the heat waste of the high-temperature flue gas minimized, but the overall energy consumption of the unit is also directly reduced, improving the energy utilization efficiency and operational economy of the rotary kiln combustion unit.

[0030] Example 2: This example is an improvement upon Example 1. For details, please refer to [link / reference]. Figure 1 - Figure 6The cleaning assembly 8 is installed inside the processing box 72. The cleaning assembly 8 includes a mounting platform 81 fixed on the heat exchanger 5, an air tank 82 fixed on the mounting platform 81, an air cylinder 83 connected to the side wall of the air tank, a fixing frame 84 fixed on the mounting frame 71, an electric push rod 85 fixed inside the fixing frame 84, a piston 86 fixed at the output end of the electric push rod 85, a sealing plug 851 installed on the end side of the air cylinder 83, and the electric push rod 85 and the sealing plug 851 are slidably connected.

[0031] The gas storage tank 82 is connected to a gas outlet pipe 87, and a control valve 88 is installed on the gas outlet pipe 87. Two branch pipes 89 are connected to the end of the gas outlet pipe 87, and multiple branch pipes 810 are connected to the end of the two branch pipes 89. Multiple pulse nozzles 811 are connected to the multiple branch pipes 810.

[0032] In this embodiment: First, the motor 76 fixed on the treatment box 72 is started by the control system. The output end of the motor 76 drives the rotating rod 77 to rotate synchronously. The two L-shaped baffles 78 fixedly sleeved on the rotating rod 77 rotate in coordination. Since one side of the L-shaped baffle 78 is tightly attached to the inner wall of the treatment box 72, the flow channel of flue gas in the treatment box 72 can be accurately switched during the rotation. When the filter plate 79 in channel one 74 needs to be cleaned due to impurities, the L-shaped baffle 78 will temporarily block the flue gas passage of channel one 74, and at the same time open channel two 75, so that the high-temperature flue gas can continue to be filtered through the filter plate 79 in channel two 75. This ensures that the effective channel maintains the normal delivery of flue gas during the cleaning process and does not affect the overall operating efficiency of the device.

[0033] After identifying the channel to be cleaned, open the slag outlet at the bottom of the treatment box 72 to remove the blockage and create a dedicated channel for the discharge of impurities during the subsequent cleaning process, thus preventing impurities from accumulating inside the treatment box 72.

[0034] Then, the control valve 88 on the outlet pipe 87 of the gas storage tank 82 is opened, and the pre-stored high-pressure gas is diverted through the outlet pipe 87 to two branch pipes 89, and then evenly delivered to the pulse nozzles 811 in the corresponding channels through multiple branch pipes 810 connected to the ends of the branch pipes 89. At the same time, the electric actuator 85 in the fixing bracket 84 on the mounting bracket 71 is activated, and its output end pushes the piston 86 to slide along the axial direction in the gas cylinder 83, further compressing the gas in the gas cylinder 83, and greatly increasing the gas pressure through the sealing plug 851, so that the pulse nozzles 811 can spray high-pressure pulse airflow onto the surface of the filter plate 79. This airflow has a strong impact force, which can efficiently blow off stubborn impurities attached to the surface of the filter plate 79, thoroughly clear the pores of the filter plate 79, and prevent impurities from continuously clogging and affecting the flow of flue gas.

[0035] Impurities blown off by the high-pressure airflow slide down the inner wall of the treatment box 72 under gravity and are smoothly discharged through the opened slag outlet, completing the centralized collection and cleaning of impurities. After the filter plate 79 in the cleaning channel is unobstructed, the slag outlet is closed to re-seal it and prevent subsequent flue gas leakage; then the electric actuator 85 drives the piston 86 to retract along the air cylinder 83 to the initial position, the air tank 82 closes the control valve 88 on the outlet pipe 87, the cleaning component 8 stops working, and the device immediately switches back to normal operation mode, and the flue gas re-passes through all unobstructed channels to complete the filtration and waste heat recovery process.

[0036] When the device does not require cleaning of the filter plate 79, the control valve 88 on the outlet pipe 87 of the air tank 82 remains closed to prevent the high-pressure gas in the tank from flowing out unnecessarily. At this time, the electric actuator 85 can be activated to drive the piston 86 rod to reciprocate in the air cylinder 83. Through the repeated compression action of the piston 86, pressure is continuously replenished into the air tank 82 to ensure that the air tank 82 always maintains sufficient gas pressure, providing a stable high-pressure gas source support for subsequent emergency or periodic cleaning of the filter plate 79, and avoiding a decrease in cleaning effect due to insufficient pressure.

[0037] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0038] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A highly efficient and stable rotary kiln combustion device, comprising a rotary kiln body (1) and a heat exchanger (5), characterized in that: A smoke collection box (2) is installed on the end side of the rotary kiln body (1), and a smoke exhaust hood (3) is connected to the smoke collection box (2), and a smoke exhaust pipe (4) is connected to the smoke exhaust hood (3). The heat exchanger (5) is connected to an air inlet pipe (6) at one end. A filter assembly (7) is installed between the heat exchanger (5) and the exhaust pipe (4). The filter assembly (7) includes a mounting bracket (71) fixed on the heat exchanger (5). A processing box (72) is fixed on the mounting bracket (71). The two ends of the processing box (72) are connected to the exhaust pipe (4) and the air inlet pipe (6) respectively. A cleaning assembly (8) is installed inside the processing box (72).

2. The efficient and stable rotary kiln combustion device according to claim 1, characterized in that: The processing box (72) is fixed with a partition (73). The processing box (72) is divided into a channel one (74) and a channel two (75). The processing box (72) is fixed with a motor (76). The output end of the motor (76) is fixed with a rotating rod (77). The rotating rod (77) is rotatably connected to the processing box (72). An L-shaped baffle (78) is fixedly sleeved on the rotating rod (77). Multiple filter plates (79) are installed inside the processing box (72).

3. The efficient and stable rotary kiln combustion device according to claim 2, characterized in that: Two L-shaped baffles (78) are provided, and the two L-shaped baffles (78) rotate synchronously. One side of the L-shaped baffle (78) is in contact with the inner wall of the processing box (72).

4. The efficient and stable rotary kiln combustion device according to claim 3, characterized in that: The filter plate (79) is arranged at an angle, and multiple filter plates (79) are arranged in a linear array. The inner diameter of the filter plate (79) is arranged in a decreasing manner.

5. The efficient and stable rotary kiln combustion device according to claim 1, characterized in that: The cleaning assembly (8) includes a mounting platform (81) fixed on the heat exchanger (5), a gas storage tank (82) fixed on the mounting platform (81), an air cylinder (83) connected to the side wall of the gas storage tank, a fixing frame (84) fixed on the mounting bracket (71), an electric push rod (85) fixed inside the fixing frame (84), a piston (86) fixed at the output end of the electric push rod (85), a sealing plug (851) installed on the end side of the air cylinder (83), and the electric push rod (85) and the sealing plug (851) are slidably connected.

6. The efficient and stable rotary kiln combustion device according to claim 5, characterized in that: The gas storage tank (82) is connected to an outlet pipe (87), and a control valve (88) is installed on the outlet pipe (87). Two branch pipes (89) are connected to the end of the outlet pipe (87), and multiple branch pipes (810) are connected to the end of the two branch pipes (89). Multiple pulse nozzles (811) are connected to the multiple branch pipes (810).

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