Sand blasting device capable of inhibiting skinning and predecomposition kiln comprising same

Abstract

The utility model discloses a sand blasting device capable of inhibiting skinning and a predecomposition kiln comprising the same, the sand blasting device capable of inhibiting skinning comprises a charging machine, a first compressed air input pipe, a connecting pipeline and a nozzle, the charging machine is communicated with one end of the connecting pipeline, and the other end of the connecting pipeline is communicated with the first compressed air input pipe; the nozzle is communicated with the other end of the connecting pipeline; materials are added through the charging machine, pass through the connecting pipeline and are sprayed out through the nozzle. The connecting position of the first compressed air input pipe and the connecting pipeline is arranged between the feeding machine and the nozzle, and compressed air input by the first compressed air input pipe is used for pushing materials to be sprayed out through the nozzle. According to the sand blasting device capable of inhibiting the crust, the crust can be cleaned and inhibited by utilizing the impact force of a hard material on the inner wall of a kiln tail system.

Description

Technical Field

[0001] This utility model relates to the field of pre-decomposition kilns, specifically to a sandblasting device capable of suppressing crust formation and a pre-decomposition kiln containing the same. Background Technology

[0002] Crust refers to the layered substance formed by raw meal powder and harmful components in kiln gas adhering to the inner wall of the kiln tail system.

[0003] The cement production process involves first grinding all raw materials into powder using a vertical mill. This powdered material is then passed through a preheater, decomposer, kiln tail flue, and rotary kiln to be calcined into clinker. During high-temperature calcination, this powdered material produces a liquid phase (containing large amounts of alkali metals and sulfur). This liquid phase causes the powder to agglomerate and adhere to the inner walls of the equipment, forming a crust. Over time, this crust accumulates, reducing the effective cross-sectional area of ​​ventilation channels, increasing resistance, affecting system ventilation, and even causing blockages. Therefore, frequent manual cleaning of the crust is necessary, which is time-consuming and labor-intensive. The C5 feed chute of the precalciner and the kiln tail flue are the most prone to crust formation. Utility Model Content

[0004] The purpose of this invention is to provide a sandblasting device capable of inhibiting crust formation and a pre-decomposition kiln containing the same. The sandblasting device for inhibiting crust formation uses compressed air to spray hard material onto the inner wall of the kiln tail system, and uses the impact force of the hard material on the inner wall of the kiln tail system to clean and inhibit crust formation.

[0005] To achieve the above objectives, this utility model provides a sandblasting device capable of inhibiting skin formation. The sandblasting device capable of inhibiting skin formation includes a feeder, a first compressed air input pipe, a connecting pipe, and a nozzle. The feeder is connected to one end of the connecting pipe, and the nozzle is connected to the other end of the connecting pipe.

[0006] The material is added by the feeder and sprayed out through the nozzle via the connecting pipe;

[0007] The connection point between the first compressed air input pipe and the connecting pipe is located between the feeder and the nozzle. The first compressed air input pipe inputs compressed air to push the material out through the nozzle.

[0008] Preferably, the sandblasting device capable of inhibiting crust formation further includes a feeding tank, the two ends of which are respectively connected to the feeder and the connecting pipeline.

[0009] Preferably, the feeding tank is sealed and connected to the second compressed air input pipe;

[0010] The feeder is connected to the feed storage tank via a sealed valve.

[0011] Preferably, the direction of the nozzle is adjustable.

[0012] Preferably, the connecting pipe is connected to the nozzle via a flexible hose.

[0013] This utility model also provides a precalciner kiln including the aforementioned sandblasting device capable of inhibiting crust formation, wherein the nozzles are respectively disposed at the kiln tail flue chamber and the bend of the C5 feed chute of the precalciner kiln, and spray steel slag into the kiln tail flue chamber and the bend of the C5 feed chute.

[0014] Preferably, pressure regulating valves are provided on the first compressed air input pipe and the second compressed air input pipe respectively.

[0015] Preferably, the material is coarse steel slag.

[0016] According to the above technical solution, the nozzle of this utility model is connected to the first compressed air input pipe. The pressure of the compressed air makes the material injected through the nozzle have a certain initial velocity. The material with the initial velocity can generate an impact force after hitting the inner wall crust. The impact force of the material on the inner wall crust surface can be used to clean the inner wall crust of the pre-decomposition kiln.

[0017] The material is set to be rigid, so that when it impacts the inner wall of the precalciner, it generates a greater impact force, making the removal of scale more effective. Preferably, the material is steel slag, specifically coarse steel slag with a particle size of 0.1mm-5mm. This coarse steel slag is continuously sprayed into the precalciner through a nozzle. The continuous impact force of the coarse steel slag on the inner wall of the precalciner effectively suppresses the formation of scale.

[0018] Under the action of compressed air, the coarse steel slag is sprayed out with a certain initial velocity and is also dispersed by the nozzle, so that the sprayed coarse steel slag can act on a larger area of ​​the pre-decomposition kiln inner wall at the same time, achieving a more efficient cleaning effect of the crust.

[0019] Other features and advantages of this invention will be described in detail in the following detailed description section. Attached Figure Description

[0020] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the following detailed description to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0021] Figure 1 This is a schematic diagram of a sandblasting device that can suppress skin formation;

[0022] Figure 2 This is a schematic diagram of a pre-decomposition kiln that includes a sandblasting device capable of inhibiting crust formation;

[0023] Figure 3 This is a schematic diagram of a nozzle.

[0024] Explanation of reference numerals in the attached figures

[0025] 1 Feeder, 2 First compressed air input pipe, 3 Connecting pipe, 4 Nozzle, 5 Feeding tank, 6 Second compressed air input pipe, 34 Hose, 43 Metal nozzle, 102C5 Discharge chute, 101 Kiln tail flue, 41 Disperser, 42 Metal sleeve Detailed Implementation

[0026] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model.

[0027] In this utility model, unless otherwise stated, directional words such as "one end," "the other end," and "between" in the terminology only represent the orientation of the term in its conventional use or are common terms understood by those skilled in the art, and should not be regarded as limitations on the term.

[0028] See Figure 1 The aforementioned sandblasting device for inhibiting crust formation includes a feeder 1, a first compressed air input pipe 2, a connecting pipe 3, and a nozzle 4. The feeder 1 is connected to one end of the connecting pipe 3, and the nozzle 4 is connected to the other end of the connecting pipe 3.

[0029] The material is added by the feeder 1 and sprayed out through the nozzle 4 via the connecting pipe 3;

[0030] The connection point between the first compressed air input pipe 2 and the connecting pipe 3 is located between the feeder 1 and the nozzle 4. The first compressed air input pipe 2 inputs compressed air to push the material out through the nozzle 4.

[0031] Through the implementation of the above technical solution, the nozzle 4 is connected to the first compressed air input pipe 2. The pressure of the compressed air makes the material injected through the nozzle 4 have a certain initial velocity. The material with the initial velocity can generate an impact force after hitting the inner wall crust. The impact force of the material on the inner wall crust surface can be used to clean the inner wall crust of the pre-decomposition kiln.

[0032] The material is set to be rigid, so that when it impacts the inner wall of the precalciner, it generates a greater impact force, making the removal of scale more effective. Preferably, the material is steel slag, specifically coarse steel slag with a particle size of 0.1mm-5mm. This coarse steel slag is continuously sprayed into the precalciner through nozzle 4. The continuous impact force of the coarse steel slag on the inner wall of the precalciner effectively suppresses the scaling.

[0033] Under the action of compressed air, the coarse steel slag is sprayed out with a certain initial velocity and is also dispersed by the nozzle, so that the sprayed coarse steel slag can act on a larger area of ​​the pre-decomposition kiln inner wall at the same time, achieving a more efficient cleaning effect of the crust.

[0034] In this embodiment, preferably, the sandblasting device capable of suppressing crust formation also includes a feeding tank 5, the two ends of which are connected to the feeder 1 and the connecting pipeline 3, respectively.

[0035] By setting up the feeding tank 5, the material can be buffered, avoiding the situation where the nozzle 4 cannot spray material due to the inability to feed in time.

[0036] Preferably, by installing a storage sensor inside the feeding tank 5, the material storage level inside the feeding tank 5 can be reliably guaranteed. This not only ensures reliable material feeding from the feeding tank 5, but also allows the feeding tank 5 with a stable storage level to provide stable pressure to its outlet, resulting in a more stable discharge rate.

[0037] Therefore, by setting up the feeding tank 5, the material feeding process can be made more reliable.

[0038] In this embodiment, preferably, the feeding tank 5 is sealed and connected to the second compressed air input pipe 6;

[0039] The feeder 1 is connected to the feed storage tank 5 through a sealed valve.

[0040] If the feeding tank 5 is only fed by the weight of the steel slag, the feeding speed of the steel slag will be relatively slow. In order to obtain the ideal feeding speed, the volume of the feeding tank 5 and the size of the feeding port of the feeding tank 5 need to be increased.

[0041] Preferably, by setting the feeding tank 5 as a sealed pressurized tank and connecting the feeding tank 5 to the second compressed air input pipe 6, the feeding tank 5 is given a certain air pressure through the second compressed air input pipe 6. Under the action of this air pressure, the feeding tank 5 can achieve rapid feeding, and the steel slag can enter the connecting pipe 3 more effectively, that is, the discharge speed of steel slag is increased without changing the volume of the equipment.

[0042] The feeding tank 5 is connected to the second compressed air input pipe 6. By controlling the pressure of the gas entering the second compressed air input pipe 6, the gas pressure inside the feeding tank 5 can be controlled. Therefore, maintaining a constant gas pressure in the compressed air tank at the end of the second compressed air input pipe 6 ensures stable and reliable feeding from the feeding tank 5. Preferably, a pressure regulating valve is installed between the compressed air tank and the second compressed air input pipe 6 to reliably guarantee the gas pressure inside the feeding tank 5.

[0043] Since the weight of the steel slag is relatively small compared to the gas pressure in the feeding tank 5, the material storage in the feeding tank 5 has little effect on the material discharge speed when there is high-pressure gas in the feeding tank 5. Therefore, as long as the gas pressure in the feeding tank 5 is kept constant, stable material discharge from the feeding tank 5 can be achieved.

[0044] When the feeding tank 5 is configured as a sealed pressurized tank, a sealed connection is required between the feeder 1 and the feeding tank 5. When it is necessary to add material to the feeding tank 5, the sealing valve can be opened, and the feeder 1 adds sufficient material to the feeding tank 5. After the feeding is completed, the sealing valve is immediately closed to ensure the sealing effect inside the feeding tank 5.

[0045] Preferably, a valve is provided on the second compressed air inlet pipe 6. To ensure the reliability and safety of feeding, the valve of the second compressed air inlet pipe 6 is closed before the sealing valve is opened, and the second compressed air inlet pipe 6 stops supplying air to the feeding tank 5. After the sealing valve is closed, the valve of the second compressed air inlet pipe 6 is opened again, and the feeding tank 5 can reliably supply material to the nozzle 4 again.

[0046] By setting the valve on the second compressed air input pipe 6 to be linked with the sealing valve, automatic control of the valve on the second compressed air input pipe 6 can be achieved.

[0047] In one embodiment, the sealing valve is configured as a plunger valve, which seals the feeding tank 5 by rising or falling. When the plunger engages with the valve body, it can achieve the sealing effect on the feeding tank 5. When the plunger moves to a position away from the valve body, the feeder above begins to discharge material.

[0048] The plunger is cone-shaped and located inside the feeding tank 5, moving up and down. The upper end of the cone is designated as the lower end, and the lower end as the larger end. When material needs to be discharged, the cone-shaped plunger moves downward, opening the discharge port. Because there is high-pressure gas inside the feeding tank 5, when the discharge port opens, the gas inside the feeding tank 5 rushes down to the discharge port. The larger end of the cone-shaped plunger can block the material inside the feeding tank 5, preventing steel slag from being ejected from the discharge port. Meanwhile, the steel slag in the upper feeder 1 falls into the discharge port under the action of gravity.

[0049] In this embodiment, preferably, the direction of the nozzle 4 is set to be adjustable.

[0050] Since the material ejected from nozzle 4 needs to fully cover the inner wall of the precalciner kiln to more effectively suppress the scaling, the direction of nozzle 4 can be adjusted to reduce the amount of nozzle 4 used. Adjusting the direction of nozzle 4 allows for greater coverage of the inner wall of the precalciner kiln.

[0051] like Figure 3 As shown, nozzle 4 includes a disperser 41, a metal nozzle 43, and a metal sleeve 42 for connecting the metal nozzle 43 and the disperser 41. The metal nozzle 43 is connected to a hose 34. The disperser 41 is located at the foremost end of nozzle 4 and is configured as a tapered long rod to expand the blasting area. The metal sleeve 42 extends into the cement kiln equipment and can slide with the metal nozzle 43 to adjust the length of the disperser 41 extending into the cement kiln equipment.

[0052] Because the cement kiln's feed chute and tail smoke chamber are relatively large, the coverage area of ​​the nozzle 4 is required to be very high. Through sliding engagement with the metal nozzle 43, the metal sleeve 42 can be partially or completely inserted into the cement kiln equipment, so that the disperser 41 can more reliably spray the steel slag to the target location and more accurately remove the crust in different places.

[0053] In this embodiment, preferably, the length of the nozzle 4 extending into the cement kiln equipment can be between 100mm and 2500mm.

[0054] In this embodiment, preferably, the connecting pipe 3 and the nozzle 4 are connected by a flexible hose 34.

[0055] The nozzle 4 is installed inside the precalciner kiln, while the connection end of the nozzle 4 can be located outside the precalciner kiln. Because the precalciner kiln is a high-temperature environment, the equipment located inside needs to be made of high-temperature resistant materials. Therefore, placing the connection end of the nozzle 4 outside the precalciner kiln can reduce the manufacturing cost of the equipment.

[0056] After the nozzle 4 is installed, the position of the connection part of the nozzle 4 outside the precalciner is determined at the same time. Therefore, setting up a flexible hose 34 to connect the pipe 3 and the nozzle 4 makes the connection more convenient.

[0057] See Figure 2 The aforementioned precalciner kiln includes a sandblasting device capable of suppressing crust formation. Nozzles 4 are respectively installed at the kiln tail flue chamber and the bend of the C5 feed chute of the precalciner kiln, spraying steel slag into the kiln tail flue chamber and the bend of the C5 feed chute.

[0058] The C5 feed chute and the kiln tail flue of the precalciner are the most prone to scaling. Therefore, a sandblasting device that can suppress scaling can be installed in the C5 feed chute and the kiln tail flue of the precalciner. By spraying high-speed hard material into the C5 feed chute and the kiln tail flue through the sandblasting device, the scaling in the C5 feed chute and the kiln tail flue can be cleaned. Continuous spraying of material can effectively suppress the scaling in the C5 feed chute and the kiln tail flue.

[0059] In this embodiment, preferably, pressure regulating valves are respectively provided on the first compressed air input pipe 2 and the second compressed air input pipe 6.

[0060] In actual production, the gas pressure injected through the first compressed air input pipe 2 may need to be adjusted depending on the degree of scaling on the inner wall. When scaling is severe or cannot be effectively suppressed, the gas pressure injected through the first compressed air input pipe 2 needs to be increased appropriately. Conversely, when scaling is effectively suppressed or not noticeable, the gas pressure injected through the first compressed air input pipe 2 can be decreased appropriately. A pressure regulating valve allows for convenient adjustment of the gas pressure injected through the first compressed air input pipe 2 according to actual production conditions.

[0061] The material feeding rate can be controlled by adjusting the gas pressure inside the second compressed air input pipe 6. The higher the gas pressure, the faster the material is fed. As the feeding rate increases, more material is sprayed from the nozzle 4 per unit time, resulting in a better cleaning effect on the inner wall crust and an increased coverage density of the inner wall crust.

[0062] In this embodiment, preferably, the material is coarse steel slag.

[0063] Using coarse steel slag as the material not only effectively cleans the scale buildup on the inner walls of the precalciner kiln, but the minerals in the steel slag, such as iron oxide and alumina, can also be used as mineralizing agents. As a mineralizing agent, steel slag can lower the clinker formation temperature and promote mineral reactions. Furthermore, steel slag can replace some limestone and clay, thereby reducing the consumption of natural resources and lowering production costs. Therefore, adding steel slag as an additive to the precalciner kiln can improve its calcination efficiency while reducing production costs.

[0064] Currently, steel slag is often used as a raw material in cement production. Typically, all raw materials are first ground into powder using a vertical mill. This powder then passes through a preheater, decomposition furnace, kiln tail flue, and rotary kiln before being finally burned into clinker. However, steel slag is ground into fine powder after the vertical milling process. Because the proportion of fine powder in the total powder is very small, uneven mixing of steel slag powder with the raw material powder is common. Uneven mixing of the steel slag powder with the raw meal affects the quality of the burned clinker.

[0065] The precalciner kiln uses a sandblasting device that can suppress crust formation to directly add coarse steel slag into the precalciner kiln. This not only saves the process of grinding the coarse steel slag, but also promotes the mixing of coarse steel slag and raw starch by spraying the coarse steel slag through nozzle 4, thereby improving the efficiency and effect of mixing steel slag and raw starch.

[0066] Preferably, the feeder 1 located in the kiln tail flue chamber 101 can add iron powder at the same time as steel slag. This iron powder will react with oxygen in the solid phase reaction zone, thereby creating a local oxygen-deficient state on the clinker surface and preventing the heavy metal chromium in the clinker from being oxidized into hexavalent chromium. Adding iron powder through the nozzle 4 can also effectively ensure the quality of cement products.

[0067] In addition, the iron oxide that has undergone oxidation will participate in the clinker calcination reaction.

[0068] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0069] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable way without contradiction. In order to avoid unnecessary repetition, this utility model will not describe the various possible combinations separately.

[0070] Furthermore, various different embodiments of this utility model can be combined in any way, as long as they do not violate the spirit of this utility model, they should also be regarded as the content disclosed by this utility model.

Claims

1. A sandblasting device capable of inhibiting skinning, characterized in that, The device comprises a feeder (1), a first compressed air input pipe (2), a connecting pipe (3) and a nozzle (4), the feeder (1) is connected with one end of the connecting pipe (3), and the nozzle (4) is connected with the other end of the connecting pipe (3); The material is added by the feeder (1) and sprayed out by the nozzle (4) through the connecting pipe (3); The connecting position of the first compressed air input pipe (2) and the connecting pipe (3) is arranged between the feeder (1) and the nozzle (4), and the first compressed air input pipe (2) inputs compressed air to push the material to be sprayed out through the nozzle (4).

2. The sandblasting device capable of suppressing the formation of a crust according to claim 1, characterized by, The sand blasting device capable of inhibiting skinning further comprises a feeding storage tank (5), and both ends of the feeding storage tank (5) are connected with the feeder (1) and the connecting pipe (3) respectively.

3. The sandblasting device capable of suppressing the formation of a crust according to claim 2, characterized in that, The feeding storage tank (5) is arranged to be sealed, and the feeding storage tank (5) is connected with a second compressed air input pipe (6). The feeder (1) is connected with the feeding storage tank (5) through a sealing valve.

4. The sandblasting device capable of suppressing the formation of a crust according to claim 3, characterized in that, The direction of the nozzle (4) is arranged to be adjustable.

5. The sandblasting device capable of suppressing the formation of a crust according to claim 3, characterized by, The connecting pipe (3) and the nozzle (4) are connected through a hose (34).

6. A precalciner kiln comprising the spattering device capable of suppressing the formation of a skin according to any one of claims 3 to 5, characterized in that, The nozzle (4) is arranged at the kiln tail flue and the C5 discharge chute bending part of the pre-decomposition kiln respectively, and sprays the steel slag to the kiln tail flue and the C5 discharge chute bending part.

7. The precalciner kiln of claim 6, wherein, Pressure regulating valves are arranged on the first compressed air input pipe (2) and the second compressed air input pipe (6) respectively.

8. The precalciner kiln of claim 6, wherein, The material is arranged to be coarse steel slag.

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