A heat supplement material adding system for a fluidized calcination furnace

Abstract

The utility model relates to metallurgical industry technical field, concretely relates to a kind of heat supplement material adding system for fluidized roasting furnace, the bottom of bunker 1 is equipped with discharge gate, the discharge gate connects the feed inlet of material conveying device 3, the valve 2 is equipped at the discharge gate;The discharge port of material conveying device 3 connects one end of material conveying pipeline 8, the other end of material conveying pipeline 8 connects the feed end of material spray gun feed inclined pipe 4, the discharge end of material spray gun feed inclined pipe 4 is connected with material spray gun 5;The discharge end of material spray gun 5 is arranged in roasting furnace, the discharge end of material spray gun 5 is equipped with the material spray gun head 6, one end of material spray gun 5 away from the discharge end is connected with air pipeline 7.The utility model can prevent fine particulate material from agglomerating and blocking in pipeline, and also uniformly disperse material to boiling reaction layer in furnace, to avoid local accumulation of heat supplement material.

Description

Technical Field

[0001] This utility model relates to the field of metallurgical industry technology, specifically to a supplementary heating material addition system for a fluidized bed roasting furnace. Background Technology

[0002] Fluidized bed roasting furnaces are core equipment in the metallurgical and chemical industries for processing materials such as sulfide ores and oxidative roasted minerals. Their working principle involves introducing high-pressure air into the bottom air chamber, causing the materials inside the furnace to enter a fluidized boiling state, completing oxidation, desulfurization, or decomposition reactions in a high-temperature environment. In actual production, factors such as fluctuations in raw material composition, low initial material temperature, and heat loss during the reaction process often lead to insufficient heat supply within the furnace. If the temperature of the fluidized bed is lower than the process requirements, it will directly result in a decrease in the material reaction rate, reduced desulfurization efficiency, and even the risk of material agglomeration blocking the fluidization channels, seriously affecting production continuity and product quality.

[0003] To address the aforementioned heat deficit, the industry commonly employs the method of adding supplementary heating materials (such as pulverized coal, coke powder, and high-calorific-value auxiliary mineral powder) to the roasting furnace for calorific value compensation. Regarding supplementary heating material addition technology, existing technologies mainly focus on blast furnace pulverized coal injection. Chinese invention patent CN102787191B provides a blast furnace pulverized coal injection system and process. This system includes multiple parallel injection tanks, fluidizing tanks, injection branch pipes, etc., and controls pulverized coal injection through pressure stabilization and flow regulation. Chinese utility model patent CN201195728Y discloses a blast furnace ironmaking pulverized coal injection lance, including an injection lance pipe, nozzle, and one-way valve, and is equipped with a positioning and locking device and a compressed air pipe, using compressed air to assist in pulverized coal transportation.

[0004] There are two main methods for adding supplementary heating materials to existing fluidized bed roasting furnaces: one is top feeding, where the supplementary heating material is directly fed into the furnace through a hopper at the top; the other is side screw conveying, where the material is fed into the furnace through a screw conveyor on the side of the furnace body. In existing technologies, supplementary heating materials (especially fine particulate materials) are prone to agglomeration and blockage in the conveying pipes, resulting in large fluctuations in the feed rate and an inability to accurately match the furnace's heat requirements. Furthermore, the lack of an effective dispersion device after the material enters the furnace easily leads to localized material accumulation, causing localized overheating or incomplete combustion, wasting supplementary heating materials and potentially generating pollutants such as carbon monoxide and dust. Utility Model Content

[0005] In view of the problems of large fluctuations in the feed amount of the heat-replenishing material and the easy local accumulation of the material after entering the fluidized bed roasting furnace in the above-mentioned existing technology, this utility model provides a heat-replenishing material addition system for fluidized bed roasting furnace.

[0006] To achieve the above objectives, the technical solution of this utility model is as follows:

[0007] A supplementary heating material addition system for a fluidized bed roasting furnace includes a silo 1, a valve 2, a material conveying device 3, a material spray gun inlet 4, a material spray gun 5, a material spray gun head 6, a compressed air pipeline 7, and a material conveying pipeline 8. The silo 1 has a discharge port at its bottom, which is connected to the inlet of the material conveying device 3. The valve 2 is located at the discharge port. The discharge port of the material conveying device 3 is connected to one end of the material conveying pipeline 8, and the other end of the material conveying pipeline 8 is connected to the inlet end of the material spray gun inlet 4. The outlet end of the material spray gun inlet 4 is connected to the material spray gun 5. The outlet end of the material spray gun 5 is located inside the roasting furnace, and the material spray gun head 6 is located at the outlet end of the material spray gun 5. The end of the material spray gun 5 furthest from the outlet end is connected to the air pipeline 7.

[0008] Furthermore, the silo 1 is a conical silo, or the silo 1 is a silo with a straight upper part and a conical bottom.

[0009] Furthermore, a material level sensor is provided above the hopper 1, and the material level sensor is connected to the automatic feeder and the control system.

[0010] Furthermore, the valve 2 is a slide gate valve or a butterfly valve.

[0011] Furthermore, the material conveying device 3 is an impeller feeder, a screw conveyor, or a scraper conveyor, and the power source of the material conveying device 3 is a variable frequency speed control motor.

[0012] Furthermore, the angle between the axis of the material spray gun feed pipe 4 and the axis of the compressed air pipe 7 is 30°-60°.

[0013] Furthermore, the angle between the material spray gun head 6 and the axis of the material spray gun 5 is 15°-45°.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] This invention provides a supplementary heating material addition system for a fluidized bed roasting furnace. A valve at the bottom outlet of the silo precisely controls the initial discharge amount of the supplementary heating material, and in conjunction with a material conveying device, ensures stable material transport. Compressed air is introduced into the material spray gun via a compressed air pipeline. This airflow assists in the smooth transport of the material, preventing fine particles from agglomerating and clogging the pipeline. It also creates a gas-solid mixture before the material enters the roasting furnace, and then the material is evenly dispersed into the fluidized bed reaction layer inside the furnace through the material spray gun nozzle at the discharge end. This avoids localized accumulation of the supplementary heating material, significantly improving heat utilization efficiency and reducing flue dust and pollutant generation. Simultaneously, by adjusting the valve opening, the motor power of the material conveying device, and the amount of compressed air, the system achieves precise matching between the amount of supplementary heating material added and the heat demand inside the furnace, effectively maintaining the fluidized bed temperature within the required process range, improving the material reaction rate and desulfurization efficiency, ensuring product quality, and meeting the demands of modern roasting production for high efficiency, stability, and energy saving. Attached Figure Description

[0016] The embodiments of this utility model will be further described below with reference to the accompanying drawings, wherein:

[0017] Figure 1 A schematic diagram of an embodiment of a supplementary material addition system for a fluidized bed roaster is shown. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the scope of the present utility model.

[0019] Reference Appendix Figure 1 A supplementary heating material addition system for a fluidized bed roasting furnace includes a silo 1, a valve 2, a material conveying device 3, a material spray gun inlet 4, a material spray gun 5, a material spray gun head 6, a compressed air pipeline 7, and a material conveying pipeline 8. The bottom of the silo 1 has a discharge port connected to the inlet of the material conveying device 3, and a valve 2 is installed at the discharge port. The discharge port of the material conveying device 3 is connected to one end of the material conveying pipeline 8, and the other end of the material conveying pipeline 8 is connected to the inlet end of the material spray gun inlet 4. The outlet end of the material spray gun inlet 4 is connected to the material spray gun 5. The outlet end of the material spray gun 5 is located inside the roasting furnace, and a material spray gun head 6 is installed at the outlet end of the material spray gun 5. The end of the material spray gun 5 furthest from the outlet end is connected to the air pipeline 7. Compressed air is used to improve the dispersion of the supplementary heating material entering the fluidized bed roasting furnace, preventing localized temperature increases after the supplementary heating material enters the fluidized bed roasting furnace and improving the uniformity of temperature rise.

[0020] In one embodiment of this utility model, the silo 1 is a conical silo, or the silo 1 is a silo with a straight upper part and a conical bottom.

[0021] In one embodiment of this utility model, a material level sensor is provided above the silo 1. The material level sensor is connected to the automatic feeder and the control system, which makes it easy to grasp the material level inside the silo 1, realize the automatic feeding of the system, avoid material interruption during production, and realize the continuous addition of heating materials.

[0022] In one embodiment of this utility model, valve 2 is a slide gate valve or butterfly valve, used to control the amount of material entering the material conveying device 3, and at the same time saves the time of material discharge from the silo 1 when the material conveying device 3 is under maintenance.

[0023] In one embodiment of this utility model, the material conveying device 3 is an impeller feeder, a screw conveyor or a scraper conveyor, and the power source of the material conveying device 3 is a variable frequency speed control motor. The amount of heat-adding material is adjusted by adjusting the opening frequency of the material conveying device 3.

[0024] In one embodiment of this utility model, the angle between the axis of the material spray gun feed pipe 4 and the compressed air pipe 7 is 30°-60°, which facilitates the compressed air to blow the heat-generating material outward more effectively.

[0025] In one embodiment of this utility model, the angle between the material spray gun head 6 and the axis of the material spray gun 5 is 15°-45°, which facilitates the adjustment of the position of the supplementary heating material blown into the fluidized bed roasting furnace.

[0026] In the fluidized bed roasting furnace slurry feeding process, the workshop uses electric hoists or conveyor belts to transport the required heating materials such as sulfur and pulverized coal to the silo 1. The amount of heating material entering the material conveying device 3 is adjusted by opening valve 2. The amount of heating material entering the material conveying pipe 8 is adjusted to a suitable level by adjusting the opening of valve 2 and the motor frequency of the conveying device 3. The heating material enters the material spray gun 5 through the material conveying pipe 8 and the inclined pipe 4 of the material spray gun. Compressed air in the compressed air pipe 7 propels the heating material into the fluidized bed roasting furnace through the spray gun head 6. The heating material enters the fluidized bed roasting furnace in a dispersed manner, evenly supplementing the heat required by the furnace. When production adjustments are needed, if it is necessary to increase or decrease the amount of heating material entering the fluidized bed roasting furnace, this can be done by adjusting valve 2 or the motor frequency of the material conveying device 3. When it is necessary to adjust the temperature at various points in the fluidized bed roasting furnace, this can be done by adjusting the angle between the axis of the spray gun head 6 and the spray gun 5. When it is necessary to adjust the dispersion of the supplementary heating material entering the fluidized bed roasting furnace, the pressure of the compressed air pipeline 7 can be adjusted. When it is necessary to inspect and repair the material conveying device 3, valve 2 can be closed to stop the material from entering the conveying device before inspection and repair can be carried out.

[0027] This invention provides a supplementary heating material addition system for a fluidized bed roasting furnace. A valve at the bottom outlet of the silo precisely controls the initial discharge amount of the supplementary heating material, and in conjunction with a material conveying device, ensures stable material transport. Compressed air is introduced into the material spray gun via a compressed air pipeline. This airflow assists in the smooth transport of the material, preventing fine particles from agglomerating and clogging the pipeline. It also creates a gas-solid mixture before the material enters the roasting furnace, and then the material is evenly dispersed into the fluidized bed reaction layer inside the furnace through the material spray gun nozzle at the discharge end. This avoids localized accumulation of the supplementary heating material, significantly improving heat utilization efficiency and reducing flue dust and pollutant generation. Simultaneously, by adjusting the valve opening, the motor power of the material conveying device, and the amount of compressed air, the system achieves precise matching between the amount of supplementary heating material added and the heat demand inside the furnace, effectively maintaining the fluidized bed temperature within the required process range, improving the material reaction rate and desulfurization efficiency, ensuring product quality, and meeting the demands of modern roasting production for high efficiency, stability, and energy saving.

[0028] The foregoing description describes some exemplary embodiments of this utility model. It is understood that the above embodiments are only used to explain this utility model and do not constitute a limitation on the scope of protection of this utility model. The features in these embodiments can be recombine in a suitable manner, and the resulting solutions are still within the scope of protection claimed by this utility model. Based on the above embodiments, all other embodiments obtained by those skilled in the art without inventive effort, that is, all modifications, equivalent substitutions, and improvements made within the spirit and principles of this application, fall within the scope of protection claimed by this utility model.

Claims

1. A heat supplement material adding system for a fluidized calciner, characterized by, The system includes a silo (1), a valve (2), a material conveying device (3), a material spray gun inlet pipe (4), a material spray gun (5), a material spray gun head (6), a compressed air pipe (7), and a material conveying pipe (8). The bottom of the silo (1) is provided with a discharge port, which is connected to the inlet of the material conveying device (3). The valve (2) is provided at the discharge port. The discharge port of the material conveying device (3) is connected to one end of the material conveying pipe (8), and the other end of the material conveying pipe (8) is connected to the inlet end of the material spray gun inlet pipe (4). The outlet end of the material spray gun inlet pipe (4) is connected to the material spray gun (5). The outlet end of the material spray gun (5) is located inside the roasting furnace. The outlet end of the material spray gun (5) is provided with the material spray gun head (6), and the end of the material spray gun (5) away from the outlet end is connected to the air pipe (7).

2. A heat supplement material adding system for a fluidized roaster according to claim 1, wherein The silo (1) is a conical silo, or the silo (1) is a silo with a straight upper part and a conical bottom.

3. A heat supplement material adding system for a fluidized roaster according to claim 1, wherein A material level sensor is provided above the hopper (1), and the material level sensor is connected to the automatic feeder and the control system.

4. A heat supplement material adding system for a fluidized roaster according to claim 1, wherein The valve (2) is a slide gate valve or a butterfly valve.

5. A heat supplement material adding system for a fluidized roaster according to claim 1, wherein The material conveying device (3) is an impeller feeder, a screw conveyor or a scraper conveyor, and the power source of the material conveying device (3) is a variable frequency speed control motor.

6. A heat supplement material adding system for a fluidized roaster according to claim 1, wherein The angle between the axis of the material spray gun feed pipe (4) and the axis of the compressed air pipe (7) is 30°-60°.

7. A heat supplement material adding system for a fluidized roaster according to claim 1, wherein The angle between the material spray gun head (6) and the axis of the material spray gun (5) is 15°-45°.

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