A dust cleaning mechanism and a cement kiln tail high-temperature bag dust collection dust cleaning device

Abstract

The utility model provides a kind of dust cleaning mechanism and cement kiln tail high-temperature bag dust collection dust cleaning device, it is related to chemical equipment technical field, solve the dust cleaning device of filter bag and the technical problem of high resistance of poor dust cleaning effect;The dust cleaning mechanism includes gas source device, spray blow main pipe and nozzle pipe, gas source device is communicated with spray blow main pipe, nozzle pipe is communicated with spray blow main pipe, nozzle pipe is arranged along the length direction of spray blow main pipe with interval, nozzle pipe is inserted into the filter bag to be cleaned, for spray blow dust cleaning in the filter bag to be cleaned;In the direction of departing from spray blow main pipe, the inner diameter of nozzle pipe gradually reduces;Since the inner diameter of nozzle pipe gradually reduces along airflow flow direction, airflow velocity increases, dynamic pressure increases, can improve the pressure of airflow in nozzle pipe end, improve the dust cleaning effect of filter bag end, prevent filter bag end due to airflow pressure not enough resulting in poor dust cleaning effect.

Description

Technical Field

[0001] This utility model relates to the field of chemical equipment technology, and in particular to a dust removal mechanism and a high-temperature bag dust collector and dust removal device for cement kiln tail. Background Technology

[0002] With the implementation of ultra-low nitrogen oxide emissions in the cement industry, SCR denitrification retrofitting is increasingly being applied in cement plants. For kiln tail flue gas denitrification in the cement industry, considering the characteristics of the cement kiln and site conditions, there are currently four main SCR process schemes: high-temperature high-dust, high-temperature medium-dust, high-temperature low-dust, and medium-temperature medium-dust. Currently, the domestic cement industry engineering application of high-temperature high-dust, high-temperature medium-dust, and high-temperature low-dust SCR denitrification systems is generally located between the C1 outlet of the kiln tail preheater and the waste heat boiler. This process is significantly affected by dust, requiring a pre-dust removal system (such as a high-temperature electrostatic precipitator or a high-temperature bag filter) before the SCR. Furthermore, the layout is greatly affected by the site conditions, making on-site installation and construction difficult. The flue gas passing through the SCR system also has a certain impact on the power generation of the waste heat boiler. Several process routes are currently in use, while the high-temperature low-dust route aims to remove dust from the flue gas to 10 mg / Nm³. 3 The following improvements significantly enhance catalyst lifespan and denitrification efficiency. Because the cleaning mechanism of metal filter bags in high-temperature, low-dust environments differs greatly from that of conventional felt materials, conventional filter bags shrink and expand during cleaning to remove dust adhering to their surface. In contrast, metal filter bags exhibit minimal deformation during cleaning; the dust is entirely forced out of the filter bag's pores by the pressure of external compressed air. Therefore, the choice of pulse-jet cleaning method is crucial.

[0003] See Figure 1 As shown, Figure 1 This is a schematic diagram of the layout of the dust removal device in the prior art; Figure 2 This is a schematic diagram of the structure of the dust removal device in the prior art; in the prior art, the nozzle 101 on the spray pipe is located outside the filter bag 5. During dust removal, the nozzle 101 is located outside the filter bag 5 to perform dust blowing treatment, and compressed air flows out from the nozzle 101 through the spray pipe 2'.

[0004] The applicant has discovered that the existing technology has at least the following technical problems: high dust concentration, high viscosity, small particle size, and the use of conventional jet cleaning pipe 2' results in poor dust removal effect at the end of the filter bag 5 during the jet cleaning process, leading to high operating resistance in the high temperature and low dust projects currently in operation in cement kilns; due to the high flue gas temperature, the nozzle is prone to misalignment; the air pressure at the top of the filter bag is high, while the air pressure at the bottom of the filter bag is low, which easily leads to poor dust removal effect at the bottom of the filter bag. Utility Model Content

[0005] The purpose of this utility model is to provide a dust removal mechanism and a dust removal device for high-temperature bag dust collectors at the tail of cement kilns, so as to solve the technical problems of poor dust removal effect and high resistance of existing filter bag dust removal devices. The various technical effects of the preferred technical solutions provided by this utility model are described in detail below.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] The dust removal mechanism provided by this utility model includes an air source device, a main jet pipe, and a nozzle pipe, wherein:

[0008] The air source device is connected to the main jet pipe, the nozzle pipe is connected to the main jet pipe, the nozzle pipes are arranged at intervals along the length of the main jet pipe, and the nozzle pipes extend into the filter bag to be cleaned for jet cleaning of the filter bag.

[0009] Along the direction away from the main spray pipe, the inner diameter of the nozzle pipe gradually decreases.

[0010] Preferably, the end of the blow pipe opposite to the air source device is a closed end.

[0011] Preferably, the main spray pipe includes a straight pipe section, all of the nozzle pipes are connected to the straight pipe section of the main spray pipe, and all of the nozzle pipes are straight pipes.

[0012] Preferably, the nozzle tube is arranged perpendicular to the main jet pipe.

[0013] Preferably, the spacing between any two adjacent nozzle tubes is equal.

[0014] Preferably, the outer wall of the nozzle tube is provided with spray holes.

[0015] Preferably, the nozzles are evenly spaced along the periphery of the nozzle tube.

[0016] Preferably, the dust removal mechanism further includes a support frame, which is fixed to an external device, and the main jet pipe is fixed to the support frame.

[0017] This utility model also provides a high-temperature bag dust collection and cleaning device for cement kiln tail, including filter bags and the aforementioned cleaning mechanism.

[0018] Preferably, the nozzle tube extends into the middle or bottom of the filter bag.

[0019] The dust removal mechanism and high-temperature bag dust collector cleaning device at the tail of cement kiln provided by this utility model have the following advantages compared with the prior art: the length of the nozzle tube can extend into the filter bag, and because the inner diameter of the nozzle tube gradually decreases along the direction away from the main spray pipe, compared with the nozzle in the prior art, when the airflow reaches the end of the nozzle tube away from the main spray pipe, the airflow velocity increases and the dynamic pressure increases due to the reduced inner diameter of the nozzle tube, which can increase the pressure of the airflow at the end of the nozzle tube, improve the dust removal effect at the end of the filter bag, and prevent poor dust removal effect at the end of the filter bag due to insufficient airflow pressure. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a structural schematic diagram of a dust removal device in the prior art, wherein 101 is a nozzle; 2' is a main blow pipe;

[0022] Figure 2 This is a schematic diagram of the structure of a dust removal device in the prior art;

[0023] Figure 3 This is a schematic diagram of the dust removal mechanism in this utility model;

[0024] Figure 4 This is a schematic diagram of the nozzle tube.

[0025] In the diagram: 1. Air source device; 2. Main jet pipe; 21. Closed end; 3. Nozzle pipe; 31. Spray hole; 4. Support frame; 5. Filter bag. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0027] In the description of this utility model, it should be understood that the terms "center," "length," "width," "height," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and "side," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0028] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0029] This utility model provides a dust removal mechanism and a high-temperature bag dust collector cleaning device for cement kiln tail, which can increase the pressure of airflow at the end of the nozzle pipe, improve the dust removal effect at the end of the filter bag, and prevent poor dust removal effect at the end of the filter bag due to insufficient airflow pressure.

[0030] The following is combined with Figure 3 and Figure 4 The technical solution provided by this utility model will be described in more detail.

[0031] Example 1:

[0032] See Figure 3 and Figure 4 As shown, the dust removal mechanism provided by this utility model includes an air source device 1, a main blowing pipe 2, and a nozzle pipe 3, wherein: the air source device 1 is connected to the main blowing pipe 2, the nozzle pipe 3 is connected to the main blowing pipe 2, the nozzle pipe 3 is arranged at intervals along the length direction of the main blowing pipe 2, the nozzle pipe 3 extends into the filter bag 5 to be cleaned, and is used to perform dust removal by blowing into the filter bag 5 to be cleaned; along the direction away from the main blowing pipe 2, the inner diameter of the nozzle pipe 3 gradually decreases.

[0033] Among them, the air source device 1 can be an air tank in the prior art, which stores compressed gas. The compressed gas in the air source device 1 enters the blow pipe 2, and the compressed air in the blow pipe 2 is distributed to each nozzle pipe 3 and then sprayed out from the nozzle pipe 3 to clean the filter bag 5.

[0034] Specifically, the length of nozzle tube 3 and the change in the inner diameter of nozzle tube 3 can be adjusted according to the actual situation. Figure 3 The change in the inner diameter of the nozzle tube 3 is not significant, but the inner diameter of the nozzle tube 3 gradually decreases along the direction away from the main spray pipe 2.

[0035] The dust removal mechanism provided by this utility model has a nozzle tube 3 that can extend into the filter bag 5. Since the inner diameter of the nozzle tube 3 gradually decreases along the direction away from the main blow pipe 2, compared with the nozzle in the prior art, when the airflow reaches the end of the nozzle tube 3 away from the main blow pipe 2, the airflow velocity increases and the dynamic pressure increases due to the reduced inner diameter of the nozzle tube 3. This can increase the pressure of the airflow at the end of the nozzle tube 3, improve the dust removal effect at the end of the filter bag 5, and prevent poor dust removal effect at the end of the filter bag 5 due to insufficient airflow pressure.

[0036] As an optional implementation, see Figure 4 As shown, nozzle holes 31 are provided on the outer wall of nozzle tube 3. The nozzle holes 31 are evenly spaced along the periphery of nozzle tube 3.

[0037] In this embodiment, the nozzle tube 3 can extend into the filter bag 5, and the peripheral wall of the nozzle tube 3 is evenly covered with spray holes 31. The diameter of the spray holes 31 can be set according to specific circumstances. Since the inner diameter of the nozzle tube 3 gradually decreases along the flow direction of the airflow, compared with a standard cylindrical tube of equal diameter, the flow velocity and dynamic pressure of the airflow can be increased at the end of the nozzle tube 3, and the pressure of the airflow increases. The airflow ejected from the end of the nozzle tube 3 can ensure the dust removal effect.

[0038] As an optional implementation, see Figure 3 As shown, the end of the blow pipe 2 that is away from the air source device 1 is a closed end 21.

[0039] This configuration prevents compressed air from being blown out from the end of the blow pipe 2 away from the air source device 1, ensuring the pressure of compressed air in the blow pipe 2 and thus ensuring the dust removal effect.

[0040] As an optional implementation, see Figure 3 As shown, the main jet pipe 2 includes a straight pipe section, and all nozzle pipes 3 are connected to the straight pipe section of the main jet pipe 2, and all nozzle pipes 3 are straight pipes.

[0041] The above structure can reduce the pressure loss of compressed air in the main blow pipe 2 and nozzle pipe 3, reduce the generation of eddies, thereby ensuring the airflow pressure and ensuring the dust removal effect on the filter bag 5.

[0042] As an optional implementation, see Figure 3 As shown, the nozzle pipe 3 is set perpendicular to the main jet pipe 2.

[0043] See Figure 3 After compressed air enters the main blow pipe 2, it can smoothly enter each nozzle pipe 3 and then be sprayed out from the nozzle hole 31 on the nozzle pipe 3, thereby cleaning the filter bag 5.

[0044] As an optional implementation, see Figure 3 As shown, the distance between any two adjacent nozzle tubes 3 is equal.

[0045] The above structure ensures that the compressed air pressure entering the main blow pipe 2 and each nozzle pipe 3 is relatively uniform, thus ensuring the dust removal effect on each filter bag 5.

[0046] As an optional implementation, see Figure 3 As shown, the dust removal mechanism also includes a support frame 4, which is fixed to the external equipment, and the main jet pipe 2 is fixed to the support frame 4.

[0047] The support frame 4 is fixed at both ends of the main jet pipe 2, providing support and fixation for the main jet pipe 2. Specifically, the support frame 4 can be fixed on the tube sheet (external equipment).

[0048] The dust removal mechanism of this embodiment has the following technical effects:

[0049] 1. Since the metal filter bag 5 has poor expansion properties and no venturi tube at the bag opening, in this embodiment, compressed air is introduced into the middle of the filter bag 5 by extending the nozzle tube 3 to solve the problem that the dust on the lower outer surface of the filter bag 5 in current use cannot be completely removed. The nozzle hole 31 on the nozzle tube 3 should be used to deal with the situation that there is no compressed air on the upper outer surface of the filter bag 5 after the extension.

[0050] 2. The diameter of the nozzle tube 3 decreases sequentially along the direction of the blowing airflow, thereby increasing the gas velocity and pressure at the end of the nozzle tube 3 and making the amount of gas entering each filter bag 5 relatively uniform.

[0051] 3. Due to the high temperature of the flue gas, the main blow pipe 2 expands under operating conditions, causing the nozzle and filter bag 5 to become misaligned. Before the improvement, if the nozzle was misaligned, the inner surface of the filter bag 5 would partially contact the airflow, preventing some airflow from entering the filter bag 5 and affecting the cleaning effect. In this embodiment, the extended nozzle pipe 3, i.e., the main blow pipe 2, expands under heat. Although the nozzle pipe 3 and filter bag 5 are not concentric, the airflow can still enter the filter bag 5 well under the guiding effect of the nozzle pipe 3, and the installation accuracy requirement is relatively low.

[0052] Example 2:

[0053] This embodiment provides a high-temperature bag dust collection and cleaning device for cement kiln tail, including filter bag 5 and the aforementioned cleaning mechanism.

[0054] The high-temperature bag dust collector and cleaning device at the tail of the cement kiln in this embodiment, due to the aforementioned cleaning mechanism, can improve the cleaning effect on the filter bag 5.

[0055] As an optional implementation, the nozzle tube 3 extends into the middle or bottom of the filter bag 5, thereby preventing poor dust removal effect at the bottom of the filter bag 5 and ensuring uniform dust removal effect of the filter bag 5.

[0056] The specific features, structures, or characteristics described in this specification may be combined in any suitable manner in one or more embodiments or examples.

[0057] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0058] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A dust removal mechanism, characterized in that, Includes air source unit, main jet pipe and nozzle pipe, wherein: The air source device is connected to the main jet pipe, the nozzle pipe is connected to the main jet pipe, the nozzle pipes are arranged at intervals along the length of the main jet pipe, and the nozzle pipes extend into the filter bag to be cleaned for jet cleaning of the filter bag. Along the direction away from the main jet pipe, the inner diameter of the nozzle pipe gradually decreases; The end of the main jet pipe that is away from the air source device is a closed end; The outer wall of the nozzle tube is provided with spray holes; The nozzles are evenly spaced along the periphery of the nozzle tube.

2. The dust removal mechanism according to claim 1, characterized in that, The main jet pipe includes a straight pipe section, all of the nozzle pipes are connected to the straight pipe section of the main jet pipe, and all of the nozzle pipes are straight pipes.

3. The dust removal mechanism according to claim 1, characterized in that, The nozzle tube is arranged perpendicularly to the main jet pipe.

4. The dust removal mechanism according to claim 1, characterized in that, The distance between any two adjacent nozzle tubes is equal.

5. The dust removal mechanism according to claim 1, characterized in that, The dust removal mechanism also includes a support frame, which is fixed to an external device, and the main jet pipe is fixed to the support frame.

6. A high-temperature bag dust collector and cleaning device for cement kiln tail, characterized in that, Includes filter bags and the dust removal mechanism as described in any one of claims 1-5.

7. The high-temperature bag dust collector and cleaning device for cement kiln tail as described in claim 6, characterized in that, The nozzle tube extends into the middle or bottom of the filter bag.

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