Ventilation device of bauxite ore calcining shaft furnace

Abstract

The utility model discloses a ventilation device of a bauxite ore calcining shaft furnace, which relates to the technical field of calcining equipment and comprises a furnace body, a ventilation pipe is arranged at the top of the furnace body, two cold air inlets are arranged on two sides of the bottom of the furnace body, and a solid material carrying platform is arranged in the furnace body above the two cold air inlets. A combustion chamber is arranged on the outer surface of the portion, above the cold air inlet, of the furnace body, the ventilation pipe is in a U shape, the bottom of the ventilation pipe extends into the furnace body, a bearing plate is arranged on the outer surface of the bottom of the ventilation pipe and in the furnace body, a stirring bin is arranged at the top end of the bearing plate, and a feeding pipe is arranged on one side of the stirring bin. By arranging a series of structures, the circulating speed of air in the furnace body is increased, oxygen in the furnace body is sufficient, the calcining effect is good, a solvent in the material box is preheated, the calcining efficiency is improved, carbon dioxide in waste gas is separated and collected, and the resource utilization rate is increased.

Description

Technical Field

[0001] This utility model relates to the field of calcination equipment technology, specifically a ventilation device for a vertical shaft furnace for bauxite calcination. Background Technology

[0002] Bauxite is an important refractory material widely used in the metallurgical industry. A calcining furnace is a thermal equipment used to heat-treat carbonaceous raw materials (such as coke and anthracite) at high temperatures to improve their properties. It is used for ironmaking, rare metal recovery, catalyst production, environmental improvement, and the production of specialty chemicals.

[0003] During the calcination of bauxite ore, high-temperature waste gas is generated. Most of the existing ventilation devices for bauxite ore calcination vertical furnaces directly discharge the waste gas. The high-temperature waste gas has a high carbon dioxide content, and direct discharge without collection will have a certain impact on the environment. In addition, the waste gas contains abundant heat energy, and failure to utilize it will result in resource waste. Utility Model Content

[0004] The purpose of this utility model is to provide a ventilation device for a vertical shaft furnace for bauxite calcination, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a ventilation device for a vertical shaft furnace for bauxite calcination, comprising a furnace body, a vent pipe at the top of the furnace body, two cold air inlets on both sides of the bottom of the furnace body, a solid material platform inside the furnace body above the two cold air inlets, a combustion chamber on the outer surface of the furnace body above the cold air inlets, the vent pipe being U-shaped, the bottom of the vent pipe extending into the furnace body, a support plate inside the furnace body on the outer surface of the bottom of the vent pipe, an agitation chamber at the top of the support plate, a feeding pipe on one side of the agitation chamber, one end of the feeding pipe extending out of the furnace body, a preheating box on the outer surface of the feeding pipe outside the furnace body, a gas transmission pipe at the top of the vent pipe, a vacuum pump at the end of the gas transmission pipe, a low-temperature box at the outlet of the vacuum pump, a storage box inside the low-temperature box, and a cooling steel pipe inside the storage box.

[0006] Preferably, a waste slag outlet is provided on one side of the furnace body below any of the cold air inlets, and a liquid ore outlet is provided on one side of the furnace body at one end of the waste slag outlet. When the furnace body calcines the bauxite, it will separate the minerals from the impurities, ensuring the purity of the extracted minerals.

[0007] Preferably, the top of the low-temperature chamber is provided with an exhaust port, through which the exhaust gas is discharged after the low-temperature chamber cools down.

[0008] Preferably, the preheating box is equipped with a heat-conducting inner core. The four corners of the rear end of the preheating box are connected to the outer surface of the furnace body with brackets. The heat-conducting inner core is made of graphene material. Graphene material has good thermal conductivity and absorbs the heat in the hot air inside the gas delivery pipe to preheat the material inside the feeding pipe. The preheating box is made of aluminum foil material. Aluminum foil material is a heat-reflective material with good heat insulation effect, which slows down heat loss and improves the preheating effect of the preheating box.

[0009] Preferably, the gas delivery pipe passes through the heat-conducting inner core, and when the gas delivery pipe discharges waste gas, it replaces the heat in the waste gas with that in the heat-conducting inner core.

[0010] Preferably, each of the two combustion chambers has a flame nozzle at one end facing the furnace body, so that the combustion chamber can input heat into the furnace body through the flame nozzle, thereby maintaining a high temperature inside the furnace body.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] 1. The ventilation system of this bauxite calcining vertical shaft furnace works in conjunction with the preheating box through the ventilation pipe. The air pump draws air from the ventilation pipe through the air delivery pipe, increasing the air circulation speed inside the furnace body, ensuring sufficient oxygen and good combustion. When the exhaust gas is discharged through the air delivery pipe, the heat in the exhaust gas is transferred to the heat-conducting inner core. The heat-conducting inner core is made of graphene material, which has good thermal conductivity. It absorbs the heat from the hot air inside the air delivery pipe, preheating the material inside the feeding pipe, increasing the air circulation speed inside the furnace body, ensuring sufficient oxygen and good calcination, and preheating the material and solvent, thus improving calcination efficiency.

[0013] 2. The ventilation system of this bauxite calcining vertical furnace has a high carbon dioxide content in the exhaust gas generated after calcining the ore in a low-temperature chamber. The exhaust pump transports the exhaust gas to the storage tank, and the exhaust gas is cooled by a cooling steel pipe, causing the carbon dioxide to separate from the exhaust gas into a liquid state. The liquid carbon dioxide is collected and recovered by the storage tank, thus separating and collecting the carbon dioxide in the exhaust gas and improving the resource utilization rate. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0015] Figure 2 This is a schematic diagram of the internal structure of the furnace body of this utility model;

[0016] Figure 3 This is a schematic diagram of the internal structure of the preheating box of this utility model;

[0017] Figure 4 This is a schematic diagram of the internal structure of the cryogenic chamber of this utility model.

[0018] In the diagram: 1. Furnace body; 2. Vent pipe; 3. Gas supply pipe; 4. Support; 5. Feeding pipe; 6. Preheating box; 7. Combustion chamber; 8. Low temperature box; 9. Air pump; 10. Exhaust port; 11. Slag discharge port; 12. Liquid ore discharge port; 13. Cold air inlet; 14. Agitation chamber; 15. Flame nozzle; 16. Solid material platform; 17. Heat-conducting inner core; 18. Support plate; 19. Storage box; 20. Cooling steel pipe. 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] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used 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. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0021] like Figures 1 to 4As shown, this embodiment discloses a ventilation device for a bauxite calcining vertical shaft furnace, comprising a furnace body 1. A ventilation pipe 2 is installed at the top of the furnace body 1, and two cold air inlets 13 are installed on both sides of the bottom of the furnace body 1. When the furnace body 1 is calcining bauxite, the two cold air inlets 13 come into contact with the outside, allowing air carrying oxygen to enter the furnace body 1 for combustion assistance. A solid material platform 16 is installed inside the furnace body 1 above the two cold air inlets 13, and a combustion chamber 7 is installed on the outer surface of the furnace body 1 above the cold air inlets 13. The ventilation pipe 2 is U-shaped, with its bottom extending into the furnace body 1. A support plate 18 is installed inside the furnace body 1 on the outer surface of the bottom of the ventilation pipe 2. An agitation chamber 14 is installed at the top of the support plate 18, and a feeding pipe 5 is installed on one side of the agitation chamber 14, with one end of the feeding pipe 5 extending out of the furnace body 1. A preheating box 6 is installed on the outer surface of the feeding pipe 5 outside the furnace body 1. Pipe 5 transports the ore mixed with solvent into the furnace body 1. When the material passes through the preheating box 6 area, it is heated and the solvent and ore are initially fused. A gas supply pipe 3 is installed at the top of the vent pipe 2, and a vacuum pump 9 is installed at the end of the gas supply pipe 3. A low temperature box 8 is installed at the outlet of the vacuum pump 9. A storage box 19 is installed inside the low temperature box 8. A cooling steel pipe 20 is installed inside the storage box 19. Cooling liquid circulates inside the cooling steel pipe 20. The vacuum pump 9 draws air from the vent pipe 2 through the gas supply pipe 3 to increase the air circulation speed inside the furnace body 1, so that the oxygen inside the furnace body 1 is sufficient and the combustion effect is good. The exhaust gas generated after ore calcination has a high carbon dioxide content. The vacuum pump 9 transports the exhaust gas into the storage box 19. The exhaust gas is cooled through the cooling steel pipe 20, so that the carbon dioxide is separated from the exhaust gas and becomes liquid. The liquid carbon dioxide is collected and recovered by the storage box 19.

[0022] Specifically, a waste discharge outlet 11 is provided on one side of the furnace body 1 below any one of the cold air inlets 13, and a liquid ore discharge outlet 12 is provided on one side of the furnace body 1 at one end of the waste discharge outlet 11. When the furnace body 1 calcines the bauxite, it will separate the minerals from the impurities, ensuring the purity of the extracted minerals.

[0023] Furthermore, the top of the low-temperature chamber 8 is provided with an exhaust port 10, through which the exhaust gas is discharged after the low-temperature chamber 8 cools down.

[0024] Furthermore, the preheating box 6 is equipped with a heat-conducting inner core 17. The four corners at the rear end of the preheating box 6 are connected to the outer surface of the furnace body 1 with a bracket 4. The heat-conducting inner core 17 is made of graphene material. Graphene material has good thermal conductivity and absorbs the heat in the hot air inside the gas pipe 3 to preheat the material inside the feeding pipe 5. The preheating box 6 is made of aluminum foil material. Aluminum foil material is a heat-reflective material with good heat insulation effect, which slows down heat loss and improves the preheating efficiency of the preheating box 6.

[0025] Furthermore, the gas supply pipe 3 passes through the heat-conducting inner core 17. When the gas supply pipe 3 discharges the waste gas, it replaces the heat in the waste gas with the heat-conducting inner core 17.

[0026] Furthermore, each of the two combustion chambers 7 has a flame nozzle 15 at one end facing the furnace body 1, so that the combustion chamber 7 can input heat into the furnace body 1 through the flame nozzle 15, keeping the furnace body 1 at a high temperature.

[0027] The method of use in this embodiment is as follows: When the bauxite calcining vertical shaft furnace is running, the combustion chamber 7 inputs heat into the furnace body 1 through the burner 15, keeping the furnace body 1 at a high temperature. The feeding pipe 5 transports the ore mixed with solvent into the furnace body 1. After the ore and solvent are mixed through the stirring chamber 14, the material is transported to the top of the solid material platform 16. The combustion chamber 7 inputs heat into the furnace body 1 through the burner 15, keeping the furnace body 1 at a high temperature for calcination. During calcination, the two cold air inlets 13 come into contact with the outside, allowing air carrying oxygen to enter the furnace body 1, achieving a combustion-supporting effect. The air pump 9 draws air from the ventilation pipe 2 through the air supply pipe 3, increasing the air circulation speed inside the furnace body 1. The furnace body 1 has sufficient oxygen and good combustion effect. The exhaust gas produced after calcining the ore has a high carbon dioxide content. The exhaust pump 9 transports the exhaust gas to the storage tank 19. The exhaust gas is cooled by the cooling steel pipe 20, causing the carbon dioxide to separate from the exhaust gas into liquid. The liquid carbon dioxide is collected and recovered by the storage tank 19. When the exhaust gas is discharged through the gas pipe 3, the heat in the exhaust gas is replaced by the heat-conducting inner core 17. The heat-conducting inner core 17 is made of graphene material. Graphene material has good thermal conductivity and absorbs the heat in the hot gas inside the gas pipe 3 to preheat the material inside the feeding pipe 5. The preheating box 6 is made of aluminum foil material. Aluminum foil material is a heat reflective material with good heat insulation effect, which slows down heat loss and improves the preheating effect of the preheating box 6.

[0028] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model 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 this utility model should be included within the protection scope of this utility model.

Claims

1. A ventilation device for a vertical shaft furnace for calcining bauxite ore, comprising a furnace body (1), characterized in that: A ventilation pipe (2) is provided at the top of the furnace body (1). Two cold air inlets (13) are provided on both sides of the bottom of the furnace body (1). A solid material platform (16) is provided inside the furnace body (1) above the two cold air inlets (13). A combustion chamber (7) is provided on the outer surface of the furnace body (1) above the cold air inlets (13). The ventilation pipe (2) is U-shaped. The bottom of the ventilation pipe (2) extends into the furnace body (1). A support plate (18) is provided inside the furnace body (1) on the bottom outer surface of the ventilation pipe (2). A top of the support plate (18) is provided with... There is an agitation chamber (14), and a feeding pipe (5) is provided on one side of the agitation chamber (14). One end of the feeding pipe (5) extends out of the furnace body (1). A preheating box (6) is provided on the outer surface of the feeding pipe (5) outside the furnace body (1). A gas transmission pipe (3) is provided at the top of the vent pipe (2). A vacuum pump (9) is provided at the end of the gas transmission pipe (3). A low temperature box (8) is provided at the outlet of the vacuum pump (9). A storage box (19) is provided inside the low temperature box (8). A cooling steel pipe (20) is provided inside the storage box (19).

2. The ventilation device for a vertical shaft furnace for bauxite calcination according to claim 1, characterized in that: A waste discharge outlet (11) is provided on one side of the furnace body (1) below any of the cold air inlets (13), and a liquid ore discharge outlet (12) is provided on one side of the furnace body (1) at one end of the waste discharge outlet (11).

3. The ventilation device for a vertical shaft furnace for bauxite calcination according to claim 2, characterized in that: The top of the low-temperature chamber (8) is provided with an exhaust port (10).

4. The ventilation device for a vertical shaft furnace for bauxite calcination according to claim 1, characterized in that: The preheating box (6) is provided with a heat-conducting inner core (17), and the four corners of the rear end of the preheating box (6) are connected to the outer surface of the furnace body (1) with a bracket (4).

5. The ventilation device for a vertical shaft furnace for bauxite calcination according to claim 1, characterized in that: The gas pipe (3) passes through the heat-conducting inner core (17).

6. The ventilation device for a vertical shaft furnace for bauxite calcination according to claim 1, characterized in that: Each of the two combustion chambers (7) has a flame nozzle (15) at one end facing the furnace body (1).

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