A rotary kiln dust recovery system
By installing dust collection and aeration components in the rotary kiln, dust recycling and efficient heat transfer are achieved, solving the problems of material waste and environmental pollution caused by the central feed inlet of traditional rotary kilns.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SICHUAN ENERGY INVESTMENT DINGSHENG LITHIUM TECH CO LTD
- Filing Date
- 2025-08-14
- Publication Date
- 2026-07-07
AI Technical Summary
The central feed inlet of a traditional rotary kiln causes hot gases and dust to escape, resulting in material waste and environmental pollution.
Dust collection components are used to collect dust inside the kiln and send it back to the feeding components through a return pipe to prevent dust from flowing into the atmosphere. At the same time, the air blowing components are used to move heat from the discharge port to the inlet port, thereby improving heat utilization.
It effectively avoids dust pollution, reduces material waste, improves heat utilization, and reduces environmental impact.
Smart Images
Figure CN224470831U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of metallurgical technology, specifically to a rotary kiln dust recovery system. Background Technology
[0002] In the process of lithium extraction from spodumene, the natural α-spodumene must first be transformed into β-spodumene before subsequent acidification, leaching and other processes can be carried out. The transformation process takes place in a rotary kiln at a reaction temperature of about 1100℃.
[0003] Traditional rotary kilns have a feed inlet in the middle. The material collected by the dust collector is usually fed through the middle feed inlet. However, the middle opening causes hot gas and dust inside the rotary kiln to escape, resulting in material waste and environmental pollution. Utility Model Content
[0004] To address the technical problems of heat waste and dust leakage leading to environmental pollution caused by the existing rotary kiln central feeding method, this utility model provides a rotary kiln dust recovery system. The system collects dust inside the kiln through a dust collection component and then returns the collected dust to the feeding component through a return pipe. This avoids the waste of dust carried away by the airflow and also prevents dust from entering the atmosphere and impacting the environment.
[0005] The technical solution of this utility model is:
[0006] A rotary kiln dust recovery system includes:
[0007] The kiln is a hollow cylindrical structure with its axis inclined. One end of the kiln is the inlet and the other end is the outlet.
[0008] The feeding assembly is located at the inlet end of the kiln;
[0009] A combustion assembly is located at one end of the kiln that is the discharge port, and the heat generated by the combustion assembly is located inside the kiln.
[0010] An air blowing component is located at one end of the kiln that is the discharge port, and the air blowing component is capable of blowing natural air into the discharge port;
[0011] The dust collection component has its inlet end located at the feed inlet of the kiln, and the dust collection component is provided with a return pipe that communicates with the feed component.
[0012] The dust collection component includes a dust collector, the inlet of which is located at the feed inlet of the kiln. The natural air blown into the discharge outlet by the air blowing component can move from the discharge outlet to the feed inlet under the action of the dust collector.
[0013] Optionally, the feeding assembly includes:
[0014] The feed pipe has its end located inside the feed inlet;
[0015] The raw material silo is connected at its bottom to the discharge pipe;
[0016] A pneumatic conveying system is installed on the return pipe and located between the raw material silo and the feeding assembly.
[0017] Optionally, the combustion assembly includes:
[0018] A fuel supply system is located at the discharge port end of the kiln;
[0019] The air-blowing assembly provides oxygen or heat to the fuel supply system.
[0020] Optionally, the dust collection assembly includes:
[0021] The negative pressure channel is connected at one end to the inlet of the kiln and at the other end to the dust collector.
[0022] The kiln tail ash hopper is connected to the dust collector, and the bottom of the kiln tail ash hopper is connected to the feeding assembly.
[0023] Optionally, the dust collection assembly includes:
[0024] The negative pressure channel is connected at one end to the inlet of the kiln and at the other end to the dust collector.
[0025] The kiln tail ash hopper is connected to the dust collector, and the bottom of the kiln tail ash hopper is connected to the feeding assembly.
[0026] Compared with the prior art, the beneficial effects of this utility model are:
[0027] The dust is collected in the kiln by the dust collection component, and then returned to the feeding component through the return pipe. This avoids the waste of dust carried away by the airflow and also prevents the dust from entering the atmosphere and affecting the environment. Attached Figure Description
[0028] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0029] Figure 1 This is a schematic diagram of the structure of this utility model;
[0030] Figure 2 This is a schematic diagram of the dust collector. Detailed Implementation
[0031] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this invention. Therefore, the drawings and description are considered exemplary in nature and not restrictive.
[0032] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0033] The following disclosure provides many different embodiments or examples for implementing various structures of this invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.
[0034] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.
[0035] Example:
[0036] See Figure 1 and Figure 2This embodiment discloses a rotary kiln dust recovery system, including a kiln 10, a feeding assembly 20, a combustion assembly 30, a dust collection assembly 40, and an aeration assembly (not shown in the figure). The kiln 10 is a hollow cylindrical structure with both ends open. During the construction and installation of the kiln 10, its axis is set at a certain inclination angle (generally, the angle between the axis of the kiln 10 and the horizontal plane is less than 15°). After installation, the higher horizontal end of the kiln 10 is its feed inlet 11, and the lower horizontal end is its discharge outlet 12.
[0037] Specifically, a feeding assembly 20 and a dust collection assembly 40 are installed at one end of the inlet 11 of the kiln 10. The dust collection assembly 40 includes a dust collector 44. A combustion assembly 30 is installed at one end of the outlet 12 of the kiln 10, and an air blowing assembly is also installed at this end of the kiln 10. The air blowing assembly can blow natural air into the outlet 12, allowing natural air to enter the kiln 10. Through the air blowing assembly and the dust collection assembly 40, the airflow flows from the outlet 12 through the interior of the kiln 10 to the inlet 11. The dust collector 44 can draw the airflow and dust at the inlet 11 into the dust collection assembly 40. The combustion assembly 30 generates a flame inside the kiln 10 and is located near the outlet 12. Under the action of the air blowing assembly and the dust collection assembly 40, the flame surges with the airflow into the depth of the kiln 10, causing the heat generated by the combustion assembly 30 to move towards the inlet 11 of the kiln 10.
[0038] In this technical solution, since the kiln 10 is set at an incline, the material fed by the feeding assembly 20 will flow towards the discharge port 12 under the action of gravity after entering the kiln 10. Then, under the action of the dust collector 44, the heat generated by the combustion assembly 30 moves from the discharge port 12 to the inlet 11, thereby heating the material, causing it to react and generate the desired substances.
[0039] During this process, the temperature of the heat generated by the combustion component 30 decreases from the discharge port 12 to the inlet port 11. Therefore, when the heat reaches or is about to reach the inlet port 11, its temperature drops to 300-400℃, so that most of the heat is effectively utilized.
[0040] Furthermore, a dust collection component 40 is installed at one end of the feed inlet 11, which can collect the trace dust materials flowing with the airflow. On the one hand, it can prevent dust from dispersing in the environment and causing pollution. On the other hand, by installing a return pipe between the dust collection component 40 and the feed component 20, the collected dust can be transported back into the feed component 20, so that the collected dust can re-enter the kiln 10, thereby reducing the amount of dust wasted.
[0041] In one specific embodiment:
[0042] The feeding assembly 20 includes a discharge pipe 21, a raw material hopper 22, and a pneumatic conveying system 23. One end (bottom end) of the discharge pipe 21 is located inside the inlet 11. The bottom of the raw material hopper 22 is connected to the other end (top end) of the discharge pipe 21 and is located above the discharge pipe 21. The pneumatic conveying system 23 is installed on the return pipe and is located between the raw material hopper 22 and the dust collection assembly 40. The pneumatic conveying system 23 employs an engineering technology that utilizes airflow energy to transport granular materials within a closed pipe. Its core principle is to achieve material suspension and directional flow through gas power. The structure of the pneumatic conveying system 23 is prior art and will not be described in detail here.
[0043] In this embodiment, the pneumatic conveying system 23 can transport dust from the dust collection component 40 to the raw material silo 22 and temporarily store the dust in the raw material silo 22. Then, the dust in the raw material silo 22 enters the kiln 10 through the feed pipe 21. Specifically, the amount of dust entering the kiln 10 is precisely controlled by the components that play a control role on the raw material silo 22.
[0044] In another specific embodiment:
[0045] The combustion assembly 30 includes a fuel supply system, which is located at the discharge port 12 of the kiln 10. The fuel supply system supplies fuel (natural gas) into the kiln 10 and supplies oxygen or heat into the kiln 10 through the aforementioned gas blowing assembly. The heat originates from the grate cooler installed in the gas blowing assembly, which heats the natural air.
[0046] In addition, the air supply system includes primary air and secondary air. The primary air supplies room temperature air into the kiln 10, while the secondary air supplies high temperature air into the kiln 10. Generally, a grate cooler is installed in the secondary air supply line to heat the air.
[0047] In another specific embodiment:
[0048] The dust collection assembly 40 includes a negative pressure channel 41 and a kiln tail ash silo 42. One end of the negative pressure channel 41 is located at the feed inlet 11 of the kiln 10 and is connected to the feed inlet 11. The kiln tail ash silo 42 is connected to the other end of the negative pressure channel 41, and the aforementioned dust collector 44 is installed on the kiln tail ash silo 42.
[0049] The bottom of the kiln tail ash hopper 42 is connected to the feeding assembly 20. The end of the negative pressure channel 41 away from the kiln tail ash hopper 42 is located above the end of the feeding assembly 20.
[0050] In another specific embodiment:
[0051] See Figure 2The dust collector 44 includes a cyclone dust collector 441, a bag dust collector 442, and an exhaust fan 443. The cyclone dust collector 441 is directly connected to the feed inlet 11 of the kiln 10, i.e., it is installed on the negative pressure channel 41. The bag dust collector 442 is connected to the cyclone dust collector 441, and the exhaust fan 443 is installed on the bag dust collector 442. The exhaust fan 443 generates a negative pressure airflow, which allows the cyclone dust collector 441 to quickly collect dust at the feed inlet of the kiln 10, while the bag dust collector 442 prevents dust from escaping.
[0052] The embodiments described above merely illustrate specific implementations of this utility model, and while the descriptions are detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model.
Claims
1. A rotary kiln dust recovery system, characterized in that, include: The kiln is a hollow cylindrical structure with its axis inclined. One end of the kiln is the inlet and the other end is the outlet. The feeding assembly is located at the inlet end of the kiln; A combustion assembly is located at one end of the kiln that is the discharge port, and the heat generated by the combustion assembly is located inside the kiln. An air blowing component is located at one end of the kiln that is the discharge port, and the air blowing component is capable of blowing natural air into the discharge port; The dust collection component has its inlet end located at the feed inlet of the kiln, and the dust collection component is provided with a return pipe that communicates with the feed component. The dust collection component includes a dust collector, the inlet of which is located at the feed inlet of the kiln. The natural air blown into the discharge outlet by the air blowing component can move from the discharge outlet to the feed inlet under the action of the dust collector.
2. The rotary kiln dust recovery system according to claim 1, characterized in that, The feeding assembly includes: The feed pipe has its end located inside the feed inlet; The raw material silo is connected at its bottom to the discharge pipe; A pneumatic conveying system is installed on the return pipe and located between the raw material silo and the feeding assembly.
3. The rotary kiln dust recovery system according to claim 1, characterized in that, The combustion assembly includes: A fuel supply system is located at the discharge port end of the kiln; The air-blowing assembly provides oxygen or heat to the fuel supply system.
4. The rotary kiln dust recovery system according to claim 1, characterized in that, The dust collection assembly includes: The negative pressure channel is connected at one end to the inlet of the kiln and at the other end to the dust collector. The kiln tail ash hopper is connected to the dust collector, and the bottom of the kiln tail ash hopper is connected to the feeding assembly.