Double-chamber lime kiln with good smoke discharge capacity
By adjusting the pipeline layout in the double-chamber lime kiln, uniform mixing of gas and air and smooth discharge of flue gas are achieved, solving the problem of increased kiln pressure limiting output and improving production efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-04
- Publication Date
- 2026-03-31
AI Technical Summary
When increasing the output of a double-chamber lime kiln, the increased flue gas velocity leads to increased pressure inside the kiln, which affects the kiln design and limits the increase in output.
Gas, air, and flue gas pipelines are arranged on the lime kiln body at specific heights, with the gas inlet located above the air inlet and the flue gas pipeline connection higher than the gas inlet. This ensures uniform mixing of gas and air and smooth discharge of flue gas. DN1000 flue gas pipelines and Q235B steel pipes are used.
It improved combustion efficiency, reduced flue gas backflow, lowered flue gas velocity, and eliminated the problem of increased kiln pressure caused by excessive flue gas velocity, resulting in a 27.3% increase in production efficiency.
Smart Images
Figure CN224065491U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of lime kiln technology, and in particular to a double-chamber lime kiln with good smoke exhaust capacity. Background Technology
[0002] A double-chamber lime kiln is an industrial kiln used to calcine limestone to produce quicklime (CaO). The key feature of a double-chamber lime kiln, compared to a traditional single-chamber kiln, is its two parallel chambers that alternate between calcination and preheating / cooling processes.
[0003] In double-chamber lime kiln production, increasing thermal intensity is necessary to improve output, which leads to increased flue gas velocity and increased kiln pressure. The pressure the kiln is designed to withstand is a crucial factor limiting output. While ensuring adequate kiln pressure, improving the flue gas exhaust system of the double-chamber lime kiln can enhance combustion efficiency. Therefore, this application proposes a double-chamber lime kiln with good flue gas exhaust capacity. Utility Model Content
[0004] To address the aforementioned technical problems, this utility model provides a double-chamber lime kiln with good flue gas extraction capacity. Through various pipes arranged at specific heights on the kiln body, the gas inlet is positioned above the air inlet. This arrangement facilitates uniform mixing of gas and air, reduces incomplete combustion in certain areas, achieves better air-gas mixing, and improves combustion efficiency. Simultaneously, the flue gas pipe connection point is higher than the gas inlet, which promotes smooth flue gas discharge and reduces flue gas backflow.
[0005] The double-chamber lime kiln in this scheme includes a lime kiln body, a gas pipeline, a flue gas pipeline, and an air pipeline. The gas inlet end of the gas pipeline is connected to the side wall of the lime kiln body, the flue gas pipeline connection end is connected to the side wall of the lime kiln body, and the air inlet end of the air pipeline is connected to the side wall of the lime kiln body. The height of the flue gas pipeline connection end is greater than that of the gas inlet end, and the height of the air inlet end is less than that of the gas inlet end.
[0006] The further defined technical solution of this utility model is:
[0007] Furthermore, the gas inlet is located directly above the air inlet.
[0008] Furthermore, the flue gas duct is a DN1000 duct.
[0009] Furthermore, the gas pipeline and / or air pipeline is a Q235B steel pipe.
[0010] The beneficial effects of this utility model are as follows: The double-chamber lime kiln provided by this utility model has various pipes with specific height relationships on the lime kiln body, so that the gas inlet end is located above the air inlet end. This arrangement helps to uniformly mix gas and air, reduce local incomplete combustion, achieve better air and gas mixing, and improve combustion efficiency. At the same time, the flue gas pipe connection end is higher than the gas inlet end, which is conducive to the smooth discharge of flue gas and reduces flue gas backflow. The larger flue gas pipe diameter also helps to reduce the flue gas velocity and increase the flue gas flow rate per unit cross section, avoiding the increase in kiln pressure caused by excessive flue gas velocity. While ensuring normal flue gas velocity, it removes the limitation of increased kiln pressure caused by high flue gas velocity, creating conditions for improving production efficiency. Attached Figure Description
[0011] Figure 1 This is a schematic diagram of a double-chamber lime kiln with good smoke extraction capacity in an embodiment of this utility model;
[0012] Among them: 100, lime kiln body; 200, gas pipeline; 210, gas inlet end; 300, flue gas pipeline; 310, flue gas pipeline connection end; 400, air pipeline; 410, air inlet end. Detailed Implementation
[0013] like Figure 1 As shown, the double-chamber lime kiln with good exhaust capacity provided in this embodiment includes a lime kiln body 100, a gas pipeline 200, a flue gas pipeline 300, and an air pipeline 400. The gas inlet end 210 of the gas pipeline 200 is connected to the right side wall of the lime kiln body 100, the flue gas pipeline connection end 310 of the flue gas pipeline 300 is connected to the left side wall of the lime kiln body 100, and the air inlet end 410 of the air pipeline 400 is connected to the right side wall of the lime kiln body 100. The height of the flue gas pipeline connection end 310 is greater than that of the gas inlet end 210, and the height of the air inlet end 410 is less than that of the gas inlet end 210.
[0014] Specifically, in this embodiment, the gas inlet 210 is located directly above the air inlet 410. After the gas and air are input into the kiln, they come into contact and mix immediately, reducing incomplete combustion and achieving better air-gas mixing, thus improving combustion efficiency. Simultaneously, the flue gas duct connection 310 is located on the other side wall and is higher than the gas inlet 210, facilitating smooth exhaust of flue gas after combustion and reducing flue gas backflow. The flue gas duct 300 is a DN1000 pipe, which, compared to the previous DN700 pipe, increases the flue gas flow rate per unit cross-section. This relieves the limitation of increased kiln pressure caused by high flue gas velocity in the double-chamber lime kiln, creating conditions for improved production efficiency. Both the gas duct 200 and the air duct 400 are Q235B steel pipes.
[0015] This invention improves the exhaust capacity of the flue gas duct, increasing the flue gas flow rate per unit cross-section while maintaining the kiln pressure (working pressure around 40 kPa). This avoids the problem of increased kiln pressure caused by excessive flue gas velocity. Compared to before the modification, the induced draft fan volume increases from 40,000 cubic meters / hour to 70,000 cubic meters / hour, and the flue gas velocity decreases from approximately 25 m / s to approximately 15 m / s. This ensures the kiln pressure remains constant despite the increased heat intensity, and the daily lime production increases from 220 t / d to 280 t / d, an increase of approximately 60 t / d, resulting in a production efficiency increase of approximately 27.3%.
[0016] In addition to the above embodiments, the present invention may have other implementation methods; all technical solutions formed by equivalent substitution or equivalent transformation fall within the protection scope claimed by the present invention.
Claims
1. A double chamber lime kiln with high discharge capacity, comprising a lime kiln body (100), a coal gas duct (200), a flue gas duct (300) and an air duct (400), characterized in that, The gas inlet end (210) of the gas pipeline (200) is connected with the side wall of the lime kiln body (100), the flue gas pipeline connecting end (310) of the flue gas pipeline (300) is connected with the side wall of the lime kiln body (100), and the air inlet end (410) of the air pipeline (400) is connected with the side wall of the lime kiln body (100), wherein the flue gas pipeline connecting end (310) is greater than the height of the gas inlet end (210), and the air inlet end (410) is less than the height of the gas inlet end (210).
2. A double chamber lime kiln according to claim 1, characterized in that The gas inlet end (210) is located directly above the air inlet end (410).
3. The double chamber lime kiln according to claim 1, characterized in that The flue gas pipeline (300) is a DN1000 pipeline.
4. The double chamber lime kiln according to claim 1, characterized in that The gas pipeline (200) and / or the air pipeline (400) are Q235B steel pipes.