Novel lime powder suspension calcining device

Abstract

The utility model discloses a novel lime powder suspension calcining device which comprises a preheater used for preheating limestone powder, a decomposing furnace used for calcining and decomposing the limestone powder and a cyclone cooler used for cooling and recycling decomposed materials. A hot blast stove for conveying combustion-supporting air into the decomposing furnace is arranged below the decomposing furnace; a cooling air outlet end of the cyclone cooler is communicated with an inlet end of the hot blast stove; the raw material utilization range is wide, utilization of fine powder can be achieved, the utilization rate of raw material products is improved, the powdery material is suspended in hot air flow, the contact face between the powdery material and the air flow is large, the heat transfer speed is extremely high, efficiency is high, and the raw overburning rate is low and is within 2%; meanwhile, heat efficiency is high, heat consumption of unit products can be effectively reduced, productivity is improved, and product quality is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of lime production, in particular to a novel device for suspending and calcining lime powder. Background Art

[0002] Currently, active lime is used as desulfurizer and smelting flux in metallurgical industries such as steel mills, aluminum plants, and power plants. The main lime production processes currently include vertical kilns, double-chamber kilns, and rotary kilns.

[0003] These kiln types all produce granular materials. Vertical kilns and double-chamber kilns produce 4-8cm materials, and rotary kilns produce 2-4cm materials. That is, both raw materials and products are granular materials. Fine materials and powders smaller than 20mm cannot be effectively utilized, which is a great waste of resources. There are many high-quality limestone mines. After mining and crushing, the fine materials and powders cannot be sold and can only be piled up in the ravines, wasting resources and land, which often becomes a difficult problem for enterprises to deal with.

[0004] At the same time, vertical kilns and double-chamber kilns rely on rotating distributors to arrange coal and stone in the kiln body, which results in uneven distribution and problems of air and coal leakage, leading to raw burning and over-burning problems, which tests the operating quality of technical workers. The basic raw and over-burning rate is around 10%.

[0005] At the same time, because traditional kilns process granular materials, they have low heat exchange efficiency and slow chemical reaction speed, resulting in low single-line output, high energy consumption, and low product quality. Under the same production capacity, there are many sewage discharge points, many personnel, large land area, and high cost. Utility Model Content

[0006] Technical purpose: In view of the above-mentioned shortcomings of existing lime production, the utility model discloses a new suspended calcined lime powder device with high heat transfer efficiency and high thermal efficiency, which can effectively reduce the heat consumption per unit product and improve the utilization rate of raw materials.

[0007] Technical solution: To achieve the above technical objectives, the utility model adopts the following technical solution:

[0008] A novel device for suspended calcining lime powder comprises a preheater for preheating limestone powder, a decomposition furnace for calcining and decomposing limestone powder, and a cyclone cooler for cooling and recovering decomposed materials. A feeding mechanism is arranged at the feed inlet of the preheater, a hot air furnace for conveying combustion-supporting air into the decomposition furnace is arranged below the decomposition furnace, and the cooling air outlet end of the cyclone cooler is connected to the inlet end of the hot air furnace.

[0009] Preferably, the preheater of the utility model adopts a cyclone preheater, including several preheating cyclones and a preheating ascending pipe used to connect the preheating cyclones to realize multi-stage heat exchange of materials, the upper part of the preheating cyclone is provided with a hot air outlet and a hot air inlet, the lower part of the preheating cyclone is provided with a discharge pipe, the preheating ascending pipe connects the hot air outlet and the hot air inlet of adjacent preheating cyclones, the preheating ascending pipe is used to transport the material between the preheating cyclones, and the discharge pipe of the preheating cyclone is connected to the preheating ascending pipe corresponding to the hot air inlet of the next-stage preheating cyclone.

[0010] Preferably, the hot air inlet of the preheating cyclone at the last stage of the preheater of the utility model is connected with the outlet of the decomposition furnace, and the feed pipe is connected with the feed inlet of the cyclone cooler.

[0011] Preferably, the cyclone cooler of the utility model includes a plurality of cooling cyclones and a cooling rising pipe for connecting the cooling cyclones, a cold air inlet and a cold air outlet are arranged at the upper part of the cooling cyclone, a second discharge pipe is arranged at the lower part of the cooling cyclone, and the cooling rising pipe connects the cold air inlet and the cold air outlet of adjacent cooling cyclones to transport the material of the upper-level cooling cyclone to the next-level cooling cyclone; the second discharge pipe is communicated with the cooling rising pipe connected to the cold air inlet of the next-level cooling cyclone.

[0012] Preferably, the connection between the hot blast furnace and the decomposition furnace of the utility model is a shrinkage structure.

[0013] Preferably, the feeding mechanism of the utility model comprises an elevator and an air conveying chute arranged at the outlet end of the elevator, and the discharge end of the air conveying chute is connected to the preheater.

[0014] Beneficial effects: The novel suspended calcined lime powder device provided by the utility model has the following beneficial effects:

[0015] 1. The utility model has a wide range of raw materials, which can realize the utilization of fine powder and improve the utilization rate of raw material products. The powdered material is suspended in the hot air flow, has a large contact surface with the air flow, has a very fast heat transfer speed, high efficiency, and a low overburning rate of less than 2%.

[0016] 2. The utility model utilizes a cyclone preheater and a cyclone cooler to heat and cool the material accordingly. The contact area between the material and the airflow is large, and the heat transfer speed is fast, which can increase the single-line capacity and improve the output.

[0017] 3. In the utility model, the cooling air for the material can enter the decomposition furnace through the hot air furnace and be used as combustion-supporting air, thereby improving thermal efficiency and reducing heat consumption.

[0018] 4. The utility model arranges a hot blast furnace at the air inlet of the decomposition furnace. The hot blast furnace can ensure that the temperature of the combustion-supporting air entering the decomposition furnace remains stable, ensure stable combustion in the decomposition furnace, thereby achieving a rapid decomposition reaction of the limestone powder, and can recycle the heat generated by calcination to reduce energy loss.

[0019] 5. The hot blast furnace and the decomposition furnace of the utility model use a constricted structure at the connection, the gas flow rate is large, and the wind speed can reach 25m / s, thereby preventing materials from falling into the hot blast furnace. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below.

[0021] Figure 1 This is a schematic diagram of the overall structure of the calcining device of the utility model;

[0022] Among them, 1-preheater, 2-decomposition furnace, 3-cyclone cooler, 4-feeding mechanism, 5-hot blast furnace, 6-preheating cyclone, 7-preheating ascending pipe, 8-discharging pipe, 9-cooling cyclone, 10-cooling ascending pipe, 11-second discharging pipe, 12-elevator, 13-air conveying chute. DETAILED DESCRIPTION

[0023] The present invention will be described more clearly and completely below by way of a preferred embodiment in conjunction with the accompanying drawings, but the present invention is not limited to the scope of the embodiment.

[0024] like Figure 1 The figure shows a novel suspended calcined lime powder device disclosed in the utility model, comprising a preheater 1 for preheating limestone powder, a decomposition furnace 2 for calcining and decomposing limestone powder, and a cyclone cooler 3 for cooling and recovering the decomposed material. A feeding mechanism 4 is arranged at the feed port of the preheater 1, and the feeding mechanism 4 comprises an elevator 12 and an air conveying chute 13 arranged at the outlet end of the elevator 12, and the discharge end of the air conveying chute 13 is connected with the preheater 1; a hot air furnace 5 for conveying combustion-supporting air into the decomposition furnace 2 is arranged below the decomposition furnace 2, and the cooling air outlet end of the cyclone cooler 3 is connected with the inlet end of the hot air furnace 5.

[0025] The utility model adopts the method of suspended calcination, which can make full use of raw materials and dust ash, and at the same time, the cooling air used for heat exchange with the calcined material is sent into the decomposition furnace as combustion-supporting air, which can improve energy utilization and thermal efficiency. The setting of the hot blast furnace can also ensure the temperature of the combustion-supporting air entering the decomposition furnace is stable, thereby realizing rapid and stable calcination and decomposition of the material.

[0026] Specifically, the preheater 1 of the utility model adopts a cyclone preheater, including a plurality of preheating cyclones 6 and a preheating ascending pipe 7 for connecting the preheating cyclones 6 to realize multi-stage heat exchange of materials. A hot air outlet and a hot air inlet are arranged at the upper part of the preheating cyclone 6, and a discharge pipe 8 is arranged at the lower part of the preheating cyclone 6. The preheating ascending pipe 7 connects the hot air outlet and the hot air inlet of adjacent preheating cyclones 6. The preheating ascending pipe 7 is used to transport materials between the preheating cyclones 6. The discharge pipe 8 of the preheating cyclone 6 is communicated with the preheating ascending pipe 7 correspondingly connected to the hot air inlet of the next-stage preheating cyclone 6.

[0027] The hot air inlet of the preheating cyclone 6 at the last stage of the preheater 1 of the utility model is connected to the outlet of the decomposition furnace 2, and the feed pipe 8 is connected to the feed port of the cyclone cooler 3, and the residual energy generated by the combustion and decomposition of the decomposition furnace is used for preheating.

[0028] In the embodiment of the utility model, a five-stage cyclone preheater is used, including a first preheating cyclone C1, a second preheating cyclone C2, a third preheating cyclone C3, a fourth preheating cyclone C4 and a fifth preheating cyclone C5. The hot air inlet of the previous preheating cyclone is connected with the hot air outlet of the next preheating cyclone in the order of numbering. The gas discharged from the decomposition furnace 2 enters the fifth preheating cyclone C5, and then flows through the fourth preheating cyclone C4, the third preheating cyclone C3, the second preheating cyclone C2 and the first preheating cyclone C1 in sequence according to the corresponding preheating ascending pipe 7. The material enters the preheating ascending pipe 7 between the first preheating cyclone C1 and the second preheating cyclone C2 from the outlet of the feeding mechanism 4, and is discharged from the first preheating cyclone C1 to the second preheating cyclone C2. The hot air enters from the hot air inlet of a preheating cyclone C1, and enters from the discharge pipe of the first preheating cyclone C1 into the preheating ascending pipe between the second preheating cyclone C2 and the third preheating cyclone C3, and enters from the hot air inlet of the second preheating cyclone C2, and enters the third preheating cyclone C3 and the fourth preheating cyclone C4 in sequence according to the same principle, and finally enters the decomposition furnace 2 through the discharge pipe of the fourth preheating cyclone C4 for decomposition. The connection between the hot air furnace 5 and the decomposition furnace 2 of the utility model is a contracted structure, so as to prevent the material in the decomposition furnace from falling into the decomposition furnace. In order to ensure the gas flow rate during the preheating process, a high-temperature fan is arranged at the hot air outlet of the first preheating cyclone C1 to maintain the high-speed flow of the gas in the ascending pipe.

[0029] The cyclone cooler 3 of the utility model includes a plurality of cooling cyclone cylinders 9 and a cooling ascending pipe 10 for connecting the cooling cyclone cylinders 9, a cold air inlet and a cold air outlet are arranged at the upper part of the cooling cyclone cylinders 9, a second discharge pipe 11 is arranged at the lower part of the cooling cyclone cylinders 9, the cooling ascending pipe 10 connects the cold air inlet and the cold air outlet of adjacent cooling cyclone cylinders 9, and transports the material of the upper-stage cooling cyclone cylinder 9 to the next-stage cooling cyclone cylinder 9; the second discharge pipe 11 is communicated with the cooling ascending pipe 10 connected to the cold air inlet of the next-stage cooling cyclone cylinder 9.

[0030] In the embodiment of the utility model, the cyclone cooler 3 adopts a three-stage cooling structure, including a first cooling cyclone L1, a second cooling cyclone L2 and a third cooling cyclone L3. The cooling air enters from the cold air inlet of the third cooling cyclone L3, flows through the second cooling cyclone L2 and the first cooling cyclone L1, and enters the hot air furnace from the cold air outlet of the first cooling cyclone L1. The discharge pipe of the fifth preheating cyclone C5 is connected to the cooling ascending pipe between the first cooling cyclone L1 and the second cooling cyclone L2, so that the calcined and decomposed lime enters the first cooling cyclone L1, is discharged through the second discharge pipe of the first cooling cyclone L1 after separation, and enters the second cooling cyclone L2, until it is discharged from the second discharge pipe on the third cooling cyclone L3, forming a lime powder product to be collected and stored.

[0031] When arranging the device, the first preheating cyclone C1, the second preheating cyclone C2, the third preheating cyclone C3, and the fourth preheating cyclone C4 can be arranged on one side of the decomposition furnace, and the fifth preheating cyclone C5 and the cyclone cooler can be arranged on the other side. The heat exchange pipeline of the fifth preheating cyclone C5 cyclone can be extended to increase the heat exchange time and ensure the heat exchange effect. Moreover, since the preheating and cooling both adopt the cyclone structure, the symmetrical arrangement of the cyclones can be achieved, which is not only beautiful, but also can greatly reduce the overall height of the preheater and reduce the space occupied by the equipment.

[0032] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A novel suspended calcined lime powder device, characterized in that: It comprises a preheater (1) for preheating limestone powder, a decomposition furnace (2) for calcining and decomposing limestone powder, and a cyclone cooler (3) for cooling and recovering decomposed materials, the feed port of the preheater (1) being provided with a feeding mechanism (4), a hot air furnace (5) for conveying combustion-supporting air into the decomposition furnace (2) being provided below the decomposition furnace (2), and the cooling air outlet end of the cyclone cooler (3) being connected to the inlet end of the hot air furnace (5); The preheater (1) adopts a cyclone preheater, comprising a plurality of preheating cyclones (6) and a preheating ascending pipe (7) for connecting the preheating cyclones (6) to realize multi-stage heat exchange of materials. A hot air outlet and a hot air inlet are arranged at the top of the preheating cyclone (6), and a discharge pipe (8) is arranged at the bottom of the preheating cyclone (6). The preheating ascending pipe (7) connects the hot air outlet and the hot air inlet of adjacent preheating cyclones (6). The preheating ascending pipe (7) is used to transport materials between the preheating cyclones (6). The discharge pipe (8) of the preheating cyclone (6) is connected to the preheating ascending pipe (7) correspondingly connected to the hot air inlet of the next-stage preheating cyclone (6).

2. A novel suspended calcined lime powder device according to claim 1, characterized in that: The hot air inlet of the preheating cyclone (6) at the last stage of the preheater (1) is connected to the outlet of the decomposition furnace (2), and the feed pipe (8) is connected to the feed inlet of the cyclone cooler (3).

3. A novel suspended calcined lime powder device according to claim 1 or 2, characterized in that: The cyclone cooler (3) comprises a plurality of cooling cyclone barrels (9) and a cooling ascending pipe (10) for connecting the cooling cyclone barrels (9); a cold air inlet and a cold air outlet are arranged at the upper portion of the cooling cyclone barrels (9); a second discharge pipe (11) is arranged at the lower portion of the cooling cyclone barrels (9); the cooling ascending pipe (10) connects the cold air inlet and the cold air outlet of adjacent cooling cyclone barrels (9) to transport the material of the upper cooling cyclone barrel (9) to the lower cooling cyclone barrel (9); the second discharge pipe (11) is in communication with the cooling ascending pipe (10) connected to the cold air inlet of the lower cooling cyclone barrel (9).

4. A novel suspended calcined lime powder device according to claim 3, characterized in that: The connection between the hot blast furnace (5) and the decomposition furnace (2) is a contraction structure.

5. A novel suspended calcined lime powder device according to claim 1, characterized in that: The feeding mechanism (4) comprises an elevator (12) and an air conveying chute (13) arranged at the outlet end of the elevator (12); the outlet end of the air conveying chute (13) is connected to the preheater (1).

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