Composite calcium carbonate cyclone preheater

Abstract

The present application relates to the technical field of cyclone preheater, especially to a composite calcium carbonate cyclone preheater, which comprises a cyclone preheater body, the cyclone preheater body comprises a top cover, an inner cylinder, a middle cylinder, an outer cylinder and a waste gas discharge pipe; the inner cylinder comprises a spiral feeding pipe, an airflow inlet pipe and a gas-material passage one; the spiral feeding pipe is arranged inside the airflow inlet pipe; compared with the prior art, the present application changes the traditional preheater exposed transmission pipeline, all pipeline channels of the present application are inside the preheater, so that the heat loss is reduced; at the same time, the curved pipe wall is reduced, the loss of material collision and friction at the curved pipe wall is reduced; the series connection mode is changed, the gas flow cycle is shortened, the efficiency is improved, the working space is saved, and the cost is reduced.

Description

Technical Field

[0001] This invention relates to the field of cyclone preheater technology, and more particularly to a composite calcium carbonate cyclone preheater. Background Technology

[0002] In the new dry process cement production, the raw materials need to be preheated and decomposed (calcium carbonate) before the calcination process. A cyclone preheater system is used in the preheating and decomposition process. The working process of this system is completed by multiple preheaters working together. The preheating method is to heat the raw materials by blowing air. The cyclone preheater completes the preheating and partial decomposition of the raw materials by using a suspension preheating method, so that the raw materials are fully mixed with the hot air flow in the kiln and the heat exchange efficiency is improved. However, while the existing cyclone preheaters can meet the basic usage requirements, they also have obvious drawbacks. In order to ensure that the raw materials are fully preheated in the kiln, the existing technical means extend the time of the material in the kiln and the heat exchange time with the hot air flow by connecting them in series. While this can achieve the desired effect, as the number of series stages increases, the pipes of each preheater section will also be extended. Moreover, each section in series requires a preheating cylinder and matching pipes. In addition, the traditional transmission pipes are complicated and have many bends, making it easy for materials to accumulate at many bends. A large area of ​​the transmission pipes is exposed to the outside, and the outer wall of the pipes is in direct contact with the air, resulting in the loss of a large amount of heat. Summary of the Invention

[0003] Therefore, this invention was made in view of the above problems. The purpose of this invention is to solve the problems of long pipelines, easy damage, rapid heat loss, and long transfer cycle by changing the structure of the cyclone preheater and changing the original series structure. This invention realizes internal piping and changes the traditional series stage preheating and single-cylinder preheating to improve the utilization rate of hot air and thus improve the overall working efficiency. This invention achieves the above objectives through the following technical solutions:

[0004] A composite calcium carbonate cyclone preheater includes a cyclone preheater body, which comprises a top cover, an inner cylinder, a middle cylinder, an outer cylinder, and a waste gas discharge pipe. The inner cylinder includes a spiral feed pipe, an airflow inlet pipe, and a first air-material channel. The spiral feed pipe is disposed inside the airflow inlet pipe. The first air-material channel is disposed above the spiral feed pipe. A middle cylinder is disposed outside the inner cylinder. The middle cylinder has an air-material spiral baffle, a bottom plate, and a second air-material channel. The air-material spiral baffle and the bottom plate are both disposed outside the airflow inlet pipe. The bottom plate is located below the gas-feed spiral baffle; the middle cylinder has a second gas-feed channel near the top of the bottom plate; an outer cylinder is located on the outside of the middle cylinder; the outer cylinder has a material sieve plate, a storage chamber, a material discharge channel, and a material collection trough; the material sieve plate and the material collection trough are fixedly located between the middle cylinder and the outer cylinder; a material discharge channel is located near the end of the middle cylinder near the material collection trough; the storage chamber is located below the bottom plate; a top cover is provided on the top of the inner cylinder, middle cylinder, and outer cylinder; a feed inlet and an exhaust gas discharge pipe are provided on the top cover.

[0005] Preferably, the feed inlet is connected to the spiral feed tube.

[0006] Preferably, the lower end of the exhaust pipe leads between the middle cylinder and the outer cylinder.

[0007] Preferably, the bottom plate is fixed to the bottom of the interlayer between the middle cylinder and the inner cylinder, and is arranged at a certain angle.

[0008] Preferably, the material collection trough is located at the bottom of the outer cylinder and is inclined at a certain angle.

[0009] Preferably, a material discharge pipe is provided at the lower end of the storage chamber.

[0010] Beneficial effects of this invention:

[0011] 1. Unlike traditional preheaters where the transmission pipes are exposed, this invention places all pipe channels inside the preheater, reducing heat loss.

[0012] 2. The reduced bending of the pipe wall decreases the material loss due to collision and friction at the bends in the pipe wall;

[0013] 3. By changing the series connection method, the gas flow cycle is shortened, efficiency is improved, workspace is saved, and costs are reduced;

[0014] 4. Shorten the traditional long and winding pipes by using short-distance channels inside the preheater to handle materials and improve the flow of hot air, thereby shortening the working cycle, reducing heat loss, and improving work efficiency.

[0015] 5. The material is preheated in the feed pipe to improve efficiency; Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of a composite calcium carbonate cyclone preheater according to the present invention.

[0017] Figure 2 Cross-sectional view of the overall structure of the present invention Figure 1 .

[0018] Figure 3 Cross-sectional view of the overall structure of the present invention Figure 2 .

[0019] Figure 4 This is a schematic diagram of the channel distribution of the present invention.

[0020] Figure 5 This is a top view of the internal structure of the present invention.

[0021] Explanation of reference numerals in the attached figures:

[0022] 1. Cyclone preheater body; 2. Top cover; 21. Feed inlet; 3. Inner cylinder; 31. Spiral feed pipe; 311. Discharge outlet; 32. Airflow inlet pipe; 321. Air-material mixing spiral wall; 33. Air-material channel one; 4. Middle cylinder; 41. Air-material spiral baffle; 42. Bottom plate; 43. Air-material channel two; 5. Outer cylinder; 51. Material screen plate; 52. Storage chamber; 53. Material discharge channel; 54. Material collection trough; 6. Material discharge pipe; 7. Waste gas discharge pipe. Detailed Implementation

[0023] Preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention can also be implemented in various different forms, and therefore the present invention is not limited to the embodiments described below. In addition, for the purpose of more clearly describing the present invention, parts not connected to the invention will be omitted from the drawings.

[0024] like Figure 1 , Figure 2 As shown, a composite calcium carbonate cyclone preheater includes a cyclone preheater body 1, which includes a top cover 2, an inner cylinder 3, a middle cylinder 4, and an exhaust pipe 7.

[0025] The top cover 2 is fixed to the top of the preheater. The top cover 2 is provided with a feed inlet 21, one end of which extends into the inner cylinder 3.

[0026] The inner cylinder 3 includes: a spiral feed pipe 31, an airflow inlet pipe 32, and an air-material channel 33;

[0027] The spiral feed pipe 31 has a spiral structure and is set along the inner wall of the inner cylinder 3. The bottom end is the discharge port 311. The material enters the bottom of the inner cylinder 3 from the feed port 21 along the spiral feed pipe 31. The hot air enters the inner cylinder 3 through the airflow inlet pipe 32 at the bottom of the inner cylinder 3. The outer wall of the spiral feed pipe 31 and the wall of the inner cylinder 3 form a gas-material mixing spiral wall 321. The gas and material spiral rise through the gas-material channel 33 located at the upper end of the inner cylinder 3 and enter the middle cylinder 4.

[0028] like Figure 3 , Figure 4 As shown, the middle cylinder 4 has a gas-material spiral baffle 41, a bottom plate 42, and a gas-material channel 43;

[0029] The gas-material spiral baffle 41 is set at the top of the middle cylinder 4, and the bottom plate 42 is fixed to the bottom of the interlayer between the middle cylinder 4 and the inner cylinder 3, arranged at a certain angle. The second gas-material channel 43 is set at the lowest point of the inclined surface of the bottom plate 42 along the outer wall of the interlayer.

[0030] The outer cylinder 5 has a material sieve plate 51, a material storage cavity 52, a material discharge channel 53, and a material collection trough 54;

[0031] The outer cylinder 5 is provided with a material sieve plate 51 and a material collection trough 54. The material collection trough 54 is fixed on the outer cylinder wall 5, and the material sieve plate 51 is fixed on the other end wall of the outer cylinder 5. The material collection trough 54 is located at the bottom and is inclined at a certain angle. The material discharge channel 53 at the lowest position of the inclined end of the material collection trough 54 is set along the outer cylinder 5 wall, and the material enters the storage chamber 52 through the material discharge channel 53.

[0032] The material discharge pipe 6 is located at the lower end of the storage chamber 52 and is directly connected to the storage chamber 52;

[0033] The bottom end of the exhaust pipe 7 is set on the outer cylinder 5, and the top end is fixed to the top cover 2. The exhaust gas enters the exhaust pipe 7 from the top of the outer cylinder 5 and then exits.

[0034] Working principle of this invention:

[0035] Hot air enters the inner cylinder 3 through the air inlet pipe 32 from the bottom. Material is fed into the spiral feed pipe 31 through the feed port 21 fixed on the top cover 2. Material enters the inner cylinder 3 through the discharge port 311 at the bottom of the spiral feed pipe 31. The outer wall of the spiral feed pipe 31 and the wall of the inner cylinder 3 form a gas-material mixing spiral wall 321. The airflow carries the material up along the gas-material mixing spiral wall 321 to the gas-material channel 33 and enters the middle cylinder 4. The upper end of the middle cylinder 4 is equipped with a gas-material spiral baffle 41, which causes the airflow to rotate downwards. The gas and material move along the wall to the bottom plate 42. The bottom plate 42 is inclined at a certain angle to prevent material from settling in the middle cylinder 4. The gas material enters the outer cylinder 5 through the gas material channel 43 located at the lowest point of the bottom plate 42. The gas material moves upward along the wall inside the outer cylinder 5 and is separated from the airflow by the material screen plate 51. Finally, the airflow is discharged through the exhaust pipe 7, while the material falls into the material collection trough 54. The material collection trough 54 is inclined at a certain angle to prevent material accumulation. The material enters the storage chamber 52 located below the bottom plate 42 through the material discharge channel 53 and is finally discharged through the material discharge pipe 6.

Claims

1. A composite calcium carbonate cyclone preheater, comprising a cyclone preheater body (1), characterized in that: The cyclone preheater body (1) includes a top cover (2), an inner cylinder (3), a middle cylinder (4), an outer cylinder (5), and a waste gas discharge pipe (7); the inner cylinder (3) includes a spiral feed pipe (31), an airflow inlet pipe (32), and a first air-material channel (33); the spiral feed pipe (31) is located inside the airflow inlet pipe (32); the first air-material channel (33) is located above the spiral feed pipe (31); the middle cylinder (4) is located outside the inner cylinder (3); the middle cylinder (4) has an air-material spiral baffle (41), a bottom plate (42), and a second air-material channel (43); the air-material spiral baffle (41) and the bottom plate (42) are both located outside the airflow inlet pipe (32); the bottom plate (42) is located below the air-material spiral baffle (41). The middle cylinder (4) is provided with a second air-material channel (43) above the bottom plate (42); an outer cylinder (5) is provided on the outside of the middle cylinder (4); the outer cylinder (5) has a material sieve plate (51), a storage cavity (52), a material discharge channel (53), and a material collection trough (54); the material sieve plate (51) and the material collection trough (54) are fixed between the middle cylinder (4) and the outer cylinder (5) at the top and bottom respectively; a material discharge channel (53) is provided at the end of the middle cylinder (4) near the material collection trough (54); the storage cavity (52) is located below the bottom plate (42); a top cover (2) is provided on the top of the inner cylinder (3), the middle cylinder (4), and the outer cylinder (5); a feed inlet (21) and a waste gas discharge pipe (7) are provided on the top cover (2).

2. The composite calcium carbonate cyclone preheater according to claim 1, characterized in that: The feed inlet (21) is connected to the spiral feed pipe (31).

3. The composite calcium carbonate cyclone preheater according to claim 1, characterized in that: The lower end of the exhaust pipe (7) leads to the space between the middle cylinder (4) and the outer cylinder (5).

4. A composite calcium carbonate cyclone preheater according to claim 1, characterized in that: The bottom plate (42) is fixed to the bottom of the interlayer between the middle cylinder (4) and the inner cylinder (3) and is arranged at a certain angle.

5. A composite calcium carbonate cyclone preheater according to claim 1, characterized in that: The material collection trough (54) is located at the bottom of the outer cylinder (5) and is inclined at a certain angle.

6. A composite calcium carbonate cyclone preheater according to claim 1, characterized in that: A material discharge pipe (6) is provided at the lower end of the storage chamber (52).

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