Rotary kiln for calcining low-calorific-value coal
By installing a filtration and catalytic mechanism for purification devices in a rotary kiln for calcining low-calorific-value coal, the problem of pollutants during raw coal combustion is solved, achieving efficient and environmentally friendly waste gas treatment and reducing energy consumption and costs.
Patent Information
- Application Number
- CN202511984058.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-26
- Publication Date
- 2026-03-20
AI Technical Summary
Existing technologies produce pollutants such as sulfur dioxide, nitrogen oxides, particulate matter, heavy metals, and mineral dust during the combustion of raw coal, which pollute the environment. Furthermore, coal is costly, energy-intensive, and inefficient.
Design a low-calorific-value coal calcination rotary kiln equipped with a purification device, including a filtration mechanism and a catalytic mechanism. The filter screen filters out large particulate pollutants, while the catalytic liquid adsorbs small particulate impurities and performs catalytic reactions to treat sulfur dioxide and nitrogen oxides.
It effectively filters and catalytically treats combustion exhaust gas, reduces pollutant emissions, prevents pollutants from depositing on the surface of clinker particles, achieves harmless treatment, and reduces environmental pollution and energy consumption.
Smart Images
Figure CN121702145A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of rotary kiln combustion technology, and more particularly to a rotary kiln for calcining low-calorific-value coal. Background Technology
[0002] Limestone's main component is calcium carbonate. Limestone can be directly processed into stone or burned into quicklime powder. Quicklime powder is a commonly used desiccant that removes water vapor using chemical absorption. Quicklime powder is also used in steel, pesticides, pharmaceuticals, desiccants, leather making, and alcohol dehydration. In the process of making quicklime powder from limestone, the limestone needs to be crushed and ground into limestone powder first, and then the limestone powder is sent into a rotary kiln for calcination to become quicklime powder.
[0003] Existing rotary kilns for calcination require ash content ≤30%, volatile matter 18%-30%, calorific value ≥5000kcal / kg, and pulverized coal fineness controlled at 8%-15%. However, in reality, my country currently faces a shortage of high-quality coal and high prices. After pulverized coal combustion, all the ash settles on the surface of the clinker particles in the burning zone, resulting in silicification of the clinker particle surface. If the coal used is raw coal, there are problems such as high coal cost, high energy consumption, and low efficiency. During combustion, pollutants such as sulfur dioxide, nitrogen oxides, particulate matter, heavy metals, and mineral dust are generated, causing environmental pollution. Summary of the Invention
[0004] The purpose of this invention is to address the shortcomings of existing technologies, such as the generation of pollutants like sulfur dioxide, nitrogen oxides, particulate matter, heavy metals, and mineral dust during the combustion of raw coal, which pollute the environment. This invention proposes a low-calorific-value coal calcination rotary kiln.
[0005] To achieve the above objectives, the present invention adopts the following technical solution: Design a low-calorific-value coal calcination rotary kiln, including a base and a kiln body. The base is provided with a feed end and a discharge end, which are respectively located at both ends of the kiln body. The base is provided with a support structure that cooperates with the kiln body. The base is also provided with a drive structure that cooperates with the kiln body. A flue is provided on the feed end, and the flue is connected to a purification device. The purification device includes a filtration mechanism and a catalytic mechanism. An air pump is fixedly installed on the purification device, and the input end of the air pump is connected to the interior of the purification device.
[0006] Furthermore, the filtration mechanism includes a mounting frame fixedly installed in the purification device, a filter screen fixedly installed on the mounting frame, and a collection box that cooperates with the filter screen inside the purification device.
[0007] Furthermore, the collection box is movably connected to the purification device, the collection box has an opening that matches the collection box, the mounting bracket is provided with a spring, and the other end of the spring is fixedly connected to a baffle, the baffle abuts against the collection box.
[0008] Furthermore, the mounting bracket is provided with a guide hole, the collection box is fixedly provided with a guide rod that cooperates with the guide hole, and the opening is provided with a limiting structure that cooperates with the collection box.
[0009] Furthermore, the limiting structure includes a rotating groove formed on the opening, a rotating part rotatably disposed within the rotating groove, and a limiting part fixedly disposed on the rotating part.
[0010] Furthermore, a rotating shaft that cooperates with the purification device is fixedly provided on the limiting part, a protrusion is fixedly connected on the rotating shaft, and a toggle part is fixedly provided on the protrusion.
[0011] Furthermore, the filter screen is provided with a tapping structure, which includes a motor fixedly installed inside the purification device. The output shaft of the motor is fixedly connected to a rotating disk, and a toggle part is fixedly installed on the rotating disk.
[0012] Furthermore, a bracket is fixedly provided on the filter screen, and a connecting rod that cooperates with the actuating part is rotatably provided on the bracket. A striking part is rotatably provided at the other end of the connecting rod, and a receiving part that cooperates with the striking part is fixedly provided on the filter screen.
[0013] Furthermore, a connecting plate is fixedly installed on the bracket, and a tension spring is fixedly connected between the connecting plate and the connecting rod.
[0014] Furthermore, the catalytic mechanism includes a catalytic pool fixedly disposed in the purification device, the catalytic pool being filled with catalytic liquid, a baffle plate cooperating with the catalytic pool being fixedly disposed in the purification device, a stirring structure being disposed on the purification device, and an inlet pipe and an outlet pipe being fixedly disposed on the purification device.
[0015] The rotary kiln for calcining low-calorific-value coal proposed in this invention has the following advantages: In this invention, by setting up a filtration mechanism and a catalytic mechanism in the purification device to feed and catalyze the exhaust gas generated by the rotary kiln combustion, the particulate matter, heavy metals and mineral dust in the exhaust gas are filtered out, and the sulfur dioxide and nitrogen oxides generated during combustion are catalyzed to achieve harmless treatment. Secondly, in this invention, a collection box is set up to collect the filtered impurities, which facilitates the same treatment of the impurities and prevents the impurities from scattering and polluting the environment. A catalytic tank is set up to catalyze the waste gas, and small particulate impurities are adsorbed and filtered by the liquid in the catalytic tank. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the structure of a low-calorific-value coal calcination rotary kiln proposed in this invention; Figure 2 This is a schematic diagram of the catalytic cell of the present invention; Figure 3 This is a schematic diagram of the structure of the bracket of the present invention; Figure 4 This is a schematic diagram of the structure of the motor of the present invention; Figure 5 This is a schematic diagram of the structure of the actuating part of the present invention; Figure 6 This is a schematic diagram of the limiting part of the present invention.
[0017] In the diagram: 1. Base; 2. Kiln body; 3. Feed end; 4. Discharge end; 5. Support structure; 6. Drive structure; 7. Flue; 8. Purification device; 81. Filter mechanism; 811. Mounting frame; 812. Filter screen; 813. Collection box; 814. Spring; 815. Baffle; 816. Guide rod; 82. Catalytic mechanism; 821. Catalytic tank; 822. Catalytic liquid; 823. Baffle; 824. Stirring structure; 825. Inlet pipe; 826. Drain pipe; 83. Limiting structure; 831. Rotating part; 832. Limiting part; 833. Rotating shaft; 834. Protrusion; 835. Actuating part; 84. Striking structure; 841. Motor; 842. Rotating disk; 843. Actuating part; 844. Bracket; 845. Connecting rod; 846. Striking part; 847. Impacted part; 848. Connecting plate; 849. Tension spring; 9. Air pump. Detailed Implementation
[0018] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.
[0019] Reference Figure 1-6 A rotary kiln for calcining low-calorific-value coal includes a base 1 and a kiln body 2. The base 1 is provided with a feed end 3 and a discharge end 4, which are respectively located at both ends of the kiln body 2. The base 1 is provided with a support structure 5 that cooperates with the kiln body 2. The base 1 is also provided with a drive structure 6 that cooperates with the kiln body 2. The feed end 3 is provided with a flue 7, which is connected to a purification device 8. The purification device 8 includes a filtration mechanism 81 and a catalytic mechanism 82. An air pump 9 is fixedly installed on the purification device 8, and the input end of the air pump 9 is connected to the interior of the purification device 8.
[0020] In this invention, by setting a filtration mechanism 81 and a catalytic mechanism 82 in the purification device 8 to feed and catalyze the exhaust gas generated by the rotary kiln combustion, particulate matter, heavy metals and mineral dust in the exhaust gas generated by the combustion of low-calorific-value pulverized coal are filtered out, preventing the particulate matter generated by combustion from settling on the surface of clinker particles in the burning zone, causing the clinker particle surface to become silicified and changing the mineral composition of the clinker surface layer. In addition, the sulfur dioxide and nitrogen oxides generated during combustion are catalytically reacted to achieve harmless treatment, and the smoke and dust emission concentration is low.
[0021] Furthermore, in this embodiment, the filtration mechanism 81 includes a mounting frame 811 fixedly installed in the purification device 8, a filter screen 812 fixedly installed on the mounting frame 811, and a collection box 813 that cooperates with the filter screen 812 is provided in the purification device 8. Large particulate pollutants in the exhaust gas are filtered through the filter screen 812, and the hot air collection box 813 collects and treats the filtered pollutants in a unified manner to prevent pollutants from being discharged into the environment and polluting the environment.
[0022] In this embodiment, the collection box 813 is movably connected to the purification device 8. The collection box 813 has an opening that matches the collection box 813. A spring 814 is provided on the mounting bracket 811. A baffle 815 is fixedly connected to the other end of the spring 814. The baffle 815 abuts against the collection box 813. When the collection box 813 is installed, the baffle 815 is moved by the abutment. At this time, the spring 814 undergoes elastic deformation. When the collection box 813 is removed, the weight of the collection box 813 increases after being loaded with impurities. The spring 814 returns to its original shape, driving the baffle 815 to move and assist in pushing the collection box 813, making it convenient to remove the collection box 813 for cleaning.
[0023] Furthermore, in this embodiment, the mounting bracket 811 is provided with a guide hole, and the collection box 813 is fixedly provided with a guide rod 816 that cooperates with the guide hole. The opening is provided with a limiting structure 83 that cooperates with the collection box 813. The guide rod 816 restricts the movement trajectory of the baffle 815, preventing the baffle 815 from tilting when the collection box 813 is installed, thereby preventing damage to the baffle 815 and the collection box 813.
[0024] In this embodiment, the limiting structure 83 includes a rotating groove formed in the opening, a rotating part 831 is rotatably disposed in the rotating groove, and a limiting part 832 is fixedly disposed on the rotating part 831. When the rotating part 831 rotates, it will drive the limiting part 832 to rotate, so that the limiting part 832 limits or releases the collection box.
[0025] It should be noted that, in this embodiment, a rotating shaft 833 that cooperates with the purification device 8 is fixedly provided on the limiting part 832. A protrusion 834 is fixedly connected to the rotating shaft 833. A toggle part 835 is fixedly provided on the protrusion 834. By setting the toggle part 835 to cooperate with the protrusion 834, it is convenient for the user to rotate the protrusion 834 and the rotating shaft 833 to adjust the position of the limiting part 832.
[0026] Furthermore, in this embodiment, the filter screen 812 is provided with a striking structure 84. The striking structure 84 includes a motor 841 fixedly installed in the purification device 8. The output shaft of the motor 841 is fixedly connected to a rotating disk 842. A toggle part 843 is fixedly installed on the rotating disk 842. By striking the filter screen 812 through the striking structure 84, the filter screen 812 vibrates, shaking off the impurities attached to the filter screen 812 and preventing the impurities from clogging the filter screen 812.
[0027] In this embodiment, a bracket 844 is fixedly mounted on the filter screen 812. A connecting rod 845, which cooperates with the actuating part 843, is rotatably mounted on the bracket 844. A striking part 846 is rotatably mounted on the other end of the connecting rod 845. A receiving part 847, which cooperates with the striking part 846, is fixedly mounted on the filter screen 812. The rotating disk 842 is driven to rotate by the motor 841. The actuating part 843 of the rotating disk 842 contacts the connecting rod 845. One end of the connecting rod 845 is pressed down, and the end with the striking part 846 is lifted up, causing the striking part 846 to separate from the receiving part 847. The motor 841 continues to drive the rotating disk 842 to rotate, causing the actuating part 843 to separate from the connecting rod 845. Under the action of gravity, the striking part 846 moves down and collides with the receiving part 847, causing the filter screen 812 to vibrate and shake off the impurities attached to the filter screen 812.
[0028] More specifically, in this embodiment, a connecting plate 848 is fixedly mounted on the bracket 844, and a tension spring 849 is fixedly connected between the connecting plate 848 and the connecting rod 845. When one end with the striking part 846 is tilted upward, the tension spring 849 undergoes elastic deformation. When the actuating part 843 separates from the connecting rod 845, the tension spring 849 resets and pulls the connecting rod 845 downward. The collision between the striking part 846 and the struck part 847 becomes more intense, which increases the vibration amplitude of the filter screen 812 and shakes off the impurities attached to the filter screen 812.
[0029] In some embodiments, the catalytic mechanism 82 includes a catalytic pool 821 fixedly disposed in the purification device 8, the catalytic pool 821 being filled with a catalytic liquid 822, a baffle 823 fixedly disposed in the purification device 8 to cooperate with the catalytic pool 821, a stirring structure 824 disposed on the purification device 8, an inlet pipe 825 and an outlet pipe 826 fixedly disposed on the purification device 8, the liquid level of the catalytic liquid 822 inside the catalytic pool 821 being less than one-third of the depth of the catalytic pool 821, and the catalytic liquid 822 being separated by the baffle 823 to form a U-shaped structure, the exhaust gas in the purification device 8 first enters the catalytic pool 821 along one end of the U-shaped structure in the catalytic pool 821, contacts the catalytic liquid 822, and exits the catalytic pool 821 along the other end of the U-shaped structure, and finally is discharged along the air pump 9.
[0030] Working method: During operation, raw materials are added to the kiln body 2 through the feed end 3. The kiln body 2 is rotated by the drive structure 6, and the raw materials in the kiln body 2 are heated at the same time. The exhaust gas generated by heating is sucked away along the flue 7 by the purification device 8 to prevent the particulate matter generated by combustion from settling on the surface of the clinker particles in the burning zone, causing the clinker particles to become silicified and changing the mineral composition of the clinker surface. Large particulate pollutants in the exhaust gas are filtered by the filter screen 812, and the filtered pollutants are collected and treated uniformly by the hot air collection box 813. The motor 841 drives the rotating disk 842 to rotate. The actuating part 843 of the rotating disk 842 contacts the connecting rod 845. One end of the connecting rod 845 is pressed down, and the end with the striking part 846 is lifted up, so that the striking part 846 separates from the impacted part 847. The motor 841 continues to drive the rotating disk 842 to rotate, so that the actuating part 843 separates from the connecting rod 845. Under the action of gravity, the striking part 846 moves down and collides with the impacted part 847. When the actuating part 843 separates from the connecting rod 845, the tension spring 849 returns to its original position and pulls the connecting rod 845 down. The collision between the striking part 846 and the impacted part 847 becomes stronger, causing the filter screen 812 to vibrate and shake off the impurities attached to the filter screen 812. The exhaust gas first enters the catalytic tank 821 along one end of the U-shaped structure, where it comes into contact with the catalytic liquid 822 and undergoes a catalytic reaction. Small particulate impurities are adsorbed and filtered by the catalytic liquid 822. The exhaust gas is then discharged from the catalytic tank 821 along the other end of the U-shaped structure and finally discharged along the air pump 9. The waste catalytic liquid can be discharged along the drain pipe 826, and new catalytic liquid can be input into the catalytic tank 821 along the inlet pipe 825.
[0031] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.
Claims
1. A rotary kiln for calcining low-calorific-value coal, comprising a base (1) and a kiln body (2), characterized in that, The base (1) is provided with a feeding end (3) and a discharging end (4), which are respectively located at both ends of the kiln body (2). The base (1) is provided with a support structure (5) that cooperates with the kiln body (2). The base (1) is also provided with a drive structure (6) that cooperates with the kiln body (2). The feeding end (3) is provided with a flue (7), which is connected to a purification device (8). The purification device (8) includes a filtration mechanism (81) and a catalytic mechanism (82). An air pump (9) is fixedly installed on the purification device (8), and the input end of the air pump (9) is connected to the interior of the purification device (8).
2. The rotary kiln for calcining low-calorific-value coal according to claim 1, characterized in that: The filtration mechanism (81) includes a mounting bracket (811) fixedly installed in the purification device (8), a filter screen (812) fixedly installed on the mounting bracket (811), and a collection box (813) that cooperates with the filter screen (812) is provided inside the purification device (8).
3. The rotary kiln for calcining low-calorific-value coal according to claim 2, characterized in that: The collection box (813) is movably connected to the purification device (8). The collection box (813) has an opening that matches the collection box (813). The mounting bracket (811) is provided with a spring (814). The other end of the spring (814) is fixedly connected to a baffle (815). The baffle (815) abuts against the collection box (813).
4. The rotary kiln for calcining low-calorific-value coal according to claim 3, characterized in that: The mounting bracket (811) has a guide hole, and the collection box (813) is fixedly provided with a guide rod (816) that cooperates with the guide hole. The opening is provided with a limiting structure (83) that cooperates with the collection box (813).
5. A rotary kiln for calcining low-calorific-value coal according to claim 4, characterized in that: The limiting structure (83) includes a rotating groove formed on the opening, a rotating part (831) is rotatably disposed in the rotating groove, and a limiting part (832) is fixedly disposed on the rotating part (831).
6. A rotary kiln for calcining low-calorific-value coal according to claim 5, characterized in that: The limiting part (832) is fixedly provided with a rotating shaft (833) that cooperates with the purification device (8), and a protrusion (834) is fixedly connected to the rotating shaft (833), and a toggle part (835) is fixedly provided on the protrusion (834).
7. A rotary kiln for calcining low-calorific-value coal according to claim 2, characterized in that: The filter screen (812) is provided with a striking structure (84), the striking structure (84) includes a motor (841) fixedly installed in the purification device (8), the output shaft of the motor (841) is fixedly connected to a rotating disk (842), and a toggle part (843) is fixedly installed on the rotating disk (842).
8. A rotary kiln for calcining low-calorific-value coal according to claim 7, characterized in that: A bracket (844) is fixedly provided on the filter screen (812). A connecting rod (845) that cooperates with the actuating part (843) is rotatably provided on the bracket (844). A striking part (846) is rotatably provided at the other end of the connecting rod (845). A receiving part (847) that cooperates with the striking part (846) is fixedly provided on the filter screen (812).
9. A rotary kiln for calcining low-calorific-value coal according to claim 8, characterized in that: A connecting plate (848) is fixedly installed on the bracket (844), and a tension spring (849) is fixedly connected between the connecting plate (848) and the connecting rod (845).
10. A rotary kiln for calcining low-calorific-value coal according to claim 1, characterized in that: The catalytic mechanism (82) includes a catalytic pool (821) fixedly disposed in the purification device (8), the catalytic pool (821) being filled with catalytic liquid (822), a baffle (823) cooperating with the catalytic pool (821) being fixedly disposed in the purification device (8), a stirring structure (824) being disposed on the purification device (8), and an inlet pipe (825) and an outlet pipe (826) being fixedly disposed on the purification device (8).