A dust removal device matched with a carbon preheater

Abstract

The application provides a dust removal device matched with a carbon preheater, which comprises the preheater, a lower hopper located at the bottom of the preheater, a ventilation main pipe located at the top of the preheater, a mixing kettle feeding port connected with the lower hopper through a feeding pipeline, a ventilation interface formed in the side wall of the lower hopper, a positive pressure dredging pipe connected between the ventilation interface and the ventilation main pipe, wherein the pipe diameter of the positive pressure dredging pipe is larger than that of the feeding pipeline, and an bag-type dust collector connected with the end of the ventilation main pipe. The positive pressure dredging pipe with a larger pipe diameter than the feeding pipeline is arranged to connect the lower hopper and the ventilation main pipe, a minimum resistance channel is constructed, compressed air in the feeding pipeline is preferentially discharged through the positive pressure dredging pipe, and thus the phenomenon of dust emission from the flange gap is avoided, and the problem that the flange and the sealing position of the rotating shaft emit dust due to the positive pressure in the lower hopper caused by the excessively large lower feeding port and the excessively small feeding pipeline diameter is solved.

Description

Technical Field

[0001] This utility model relates to the field of dust removal technology for carbon preheaters, and in particular to a dust removal device for carbon preheaters. Background Technology

[0002] In the carbon processing, carbon raw materials (such as coke powder, petroleum coke, etc.) are first heated to 160-185℃ by a preheater to remove moisture and adjust the temperature to be close to the asphalt batching temperature (170-190℃) to reduce the increase in viscosity of asphalt due to temperature difference and ensure that it fully wets the surface of raw material particles. Then, the preheated raw materials are directly put into the mixing pot, and under the heating environment of 175-190℃, they are uniformly mixed with asphalt and form a homogeneous paste through the strong shearing, extrusion and stirring action of the stirring paddle.

[0003] However, in practical applications, when the preheater feeds material into the mixing pot, the large size of the discharge port and the small diameter of the connecting pipe create a sudden change in the cross-section of the conveying channel. This structure causes a positive pressure effect inside the hopper—the upper and lower inlet and outlet ports are completely filled with material, preventing the internal air from escaping smoothly, ultimately resulting in dust overflowing from the flange connection and the rotating shaft seal.

[0004] This phenomenon not only leads to excessive dust concentration in the work area, creating uncontrollable dust pollution, but also seriously deteriorates the environment around the equipment, posing a challenge to production safety and environmental compliance. Utility Model Content

[0005] The purpose of this invention is to solve the problem in the prior art where the connection between the preheater and the mixing pot has an excessively large discharge port and an excessively small conveying pipe diameter, resulting in positive pressure inside the discharge hopper and causing dust to emerge from the flange and the rotating shaft seal.

[0006] To achieve the above objectives, this application proposes a dust removal device for a carbon preheater, comprising: a preheater; a hopper located at the bottom of the preheater; a main ventilation pipe located at the top of the preheater; a mixing pot inlet connected to the hopper via a conveying pipe; a ventilation port provided on the side wall of the hopper; the ventilation port being connected to the main ventilation pipe via a positive pressure venting pipe, the diameter of which is larger than that of the conveying pipe; and a bag filter connected to the end of the main ventilation pipe.

[0007] This application relates to a dust removal device for a carbon preheater. By setting up a positive pressure drainage pipe with a diameter larger than the conveying pipe to connect the hopper and the main ventilation pipe, a minimum resistance channel is constructed, allowing compressed air in the conveying pipe to be discharged preferentially through the positive pressure drainage pipe. This avoids dust emission from the flange gaps and solves the problem in the prior art where the discharge port at the connection between the preheater and the mixing pot is too large and the conveying pipe diameter is too small, resulting in positive pressure inside the hopper and causing dust emission from the flange and rotating shaft seal.

[0008] Furthermore, in order to facilitate the installation of the positive pressure venting pipe, the venting interface is welded to the flange interface and connected to the input end of the positive pressure venting pipe.

[0009] Furthermore, to enhance the sealing performance of the flange interface, a high-temperature sealing gasket is used at the connection between the flange interface and the inlet end of the positive pressure venting pipe.

[0010] Furthermore, in order to connect the main ventilation pipe and the positive pressure venting pipe, the main ventilation pipe is connected to the output end of the positive pressure venting pipe through a reducing connector.

[0011] Furthermore, in order to reduce the stress at the reducing joint, the reducing joint has a tapered flared structure.

[0012] Furthermore, in order to create a low-resistance channel between the main ventilation pipe and the positive pressure drainage pipe, the diameter of the main ventilation pipe is larger than that of the positive pressure drainage pipe.

[0013] Furthermore, in order to monitor the pressure inside the conveying pipeline, a pressure sensor is also included, which is embedded in the flange connection between the hopper and the conveying pipeline.

[0014] The beneficial effects of this application are as follows: 1. The dust removal device of this application is a matching device for a carbon preheater. By setting a positive pressure drainage pipe with a diameter larger than that of the conveying pipe to connect the hopper and the ventilation main pipe, a minimum resistance channel is constructed, so that the compressed air in the conveying pipe is preferentially discharged through the positive pressure drainage pipe, thereby avoiding dust emission from the flange gap. This solves the problem in the prior art where the discharge port at the connection between the preheater and the mixing pot is too large and the conveying pipe diameter is too small, resulting in positive pressure inside the hopper and causing dust emission from the flange and rotating shaft seal.

[0015] 2. This application provides a flange interface and a reducing joint to enable the installation of the positive pressure drainage pipe, the hopper, and the ventilation main pipe. The flange interface enables a quick connection between the positive pressure drainage pipe and the hopper, while the reducing joint enables a smooth transition of airflow and reduces turbulence caused by abrupt changes in cross-section.

[0016] 3. The diameters of the material conveying pipe, the positive pressure drainage pipe, and the preheater ventilation pipe of this application increase sequentially, forming a compressed air discharge channel with progressively decreasing resistance. This guides the compressed air in the material conveying pipe while preventing dust from escaping from the flange connections in the compressed air delivery path. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments 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.

[0018] Figure 1 This is a schematic diagram of a dust removal device for a carbon preheater, as described in an embodiment of this application. Explanation of reference numerals in the attached figures: 1. Feed hopper; 2. Ventilation main pipe; 3. Mixing pot inlet; 4. Material conveying pipeline; 5. Ventilation port; 6. Positive pressure drainage tube; 7. Baghouse dust collector; 8. Flange interface; 9. Reducing joint; 10. Pressure sensor. Detailed Implementation

[0019] The following will be combined with the appendix Figure 1 The embodiments of the technical solutions of this application are described in detail below. The following embodiments are only used to more clearly illustrate the technical solutions of this application, and are therefore merely examples and should not be used to limit the scope of protection of this application. Furthermore, the technical features involved in the various embodiments of this application described below can be combined with each other as long as they do not conflict with each other.

[0020] Implementation Method 1 like Figure 1 As shown, this embodiment constructs the lowest resistance escape path for compressed air through a pipe diameter gradient design to prevent compressed air from escaping along the flange seal and causing dust emission.

[0021] Specifically, the ventilation port 5 on the side wall of the hopper 1 is connected to the main ventilation pipe 2 via a positive pressure duct 6. In a preferred embodiment, the nominal diameter of the conveying pipe 4 is designed to be DN100, the positive pressure duct 6 to be DN150, and the main ventilation pipe 2 to be DN200. A low-resistance air-guiding channel is constructed through a gradient increase in pipe diameter (DN100→DN150→DN200). When compressed air is generated during material conveying, according to the fluid mechanics continuity equation Q=AV, the increasing pipe diameter creates a diffusion effect, causing static pressure recovery at the connection between the positive pressure duct 6 and the main ventilation pipe 2. At this time, the compressed air in the conveying pipe 4 preferentially chooses the low-resistance path of the positive pressure duct 6 for discharge, forming a local negative pressure zone at the ventilation port 5, effectively balancing the system pressure. The bag filter 7 continuously purifies the gas through negative pressure suction, ensuring that the dust concentration in the operating area meets the GB16297-1996 standard. Pressure sensor 10 is embedded in the flange connection of the conveying pipeline 4 to monitor the 0-5 kPa micro-positive pressure in real time and to trigger an alarm when the pressure exceeds the threshold.

[0022] Furthermore, to improve the ease of equipment maintenance, a flange interface 8 is provided at the vent interface 5 in this embodiment. This flange interface 8 is designed according to the HG / T20592-2009 standard, and its bolt hole positions are perfectly matched with the flange at the input end of the positive pressure venting pipe 6. Quick connection is achieved by applying pre-tightening force with a torque wrench. During installation, a high-temperature resistant graphite composite gasket is used. This gasket maintains its elastic deformation capacity even under operating conditions of 150-200℃, filling the microscopic unevenness of the flange surface to form an effective sealing barrier. The flange interface 8 allows the positive pressure venting pipe 6 to be installed independently of the material conveying pipe 4, avoiding overall disassembly that would affect production efficiency, while also providing operational space for subsequent pipe diameter adjustments or component replacements. The flange connection strictly follows the GB / T20801.4-2006 specification, ensuring that the parallelism of the sealing surface is ≤0.8mm, the centerline misalignment is ≤1.5mm, and the bolt pre-tightening force is evenly distributed.

[0023] Furthermore, the ventilation main pipe 2 is connected to the output end of the positive pressure venting pipe 6 via a reducing connector 9. This connector adopts a tapered flared structure, with the smaller end matching the flange of the output end of the positive pressure venting pipe 6 and the larger end connecting to the flange of the ventilation main pipe 2. Based on the boundary layer theory of fluid mechanics, the length of the tapered transition section is designed to be three times the pipe diameter difference, allowing the airflow to transition smoothly from the smaller pipe diameter to the larger pipe diameter, effectively reducing turbulence caused by abrupt changes in cross-section. The inner wall of the reducing connector 9 is precision polished, with a surface roughness Ra≤1.6μm, to avoid airflow separation and the generation of vortices, and to prevent pipe vibration caused by sudden changes in flow velocity, ensuring the stable operation of the dust removal system.

[0024] Furthermore, the pressure sensor 10 employs a high-temperature resistant piezoresistive element, with a measurement range covering 0-5 kPa and an accuracy class of 0.25%FS. The sensor probe is embedded in the flange connection between the conveying pipe 4 and the discharge hopper 1, and its sensitive element is directly exposed to the airflow field. Pressure changes are converted into electrical signals using the Wheatstone bridge principle. When the detected pressure exceeds the set threshold, the signal is processed by a Siemens S7-1200 PLC and then, via the MODBUS protocol, the frequency of the bag filter 7 fan is adjusted. This closed-loop control system ensures that the pressure inside the pipeline remains within a safe range, preventing flange seal failure or pipeline blockage. The historical data storage function records pressure fluctuation curves, providing a basis for equipment maintenance. An early warning mechanism is triggered when abnormal pressure is detected for three consecutive cycles.

[0025] In the description of the embodiments of this application, the technical terms "upper", "lower", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application 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 the embodiments of this application.

[0026] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "set," "equipped with," "connected," and "installed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0027] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A dust removal device for use with a carbon preheater, comprising: A preheater (11); a hopper (1) located at the bottom of the preheater (11); a ventilation main pipe (2) located at the top of the preheater (11); and a mixing pot inlet (3) connected to the hopper (1) via a conveying pipe (4); characterized in that, Ventilation ports (5) are provided on the side wall of the hopper (1). The ventilation port (5) is connected to the ventilation main pipe (2) through a positive pressure drainage pipe (6), the diameter of which is larger than that of the material conveying pipe (4). The end of the ventilation duct (2) is connected to a bag filter (7).

2. The dust removal device for a carbon preheater according to claim 1, characterized in that, The ventilation port (5) is connected to the flange port (8) of the positive pressure venting pipe (6) at the input end.

3. The dust removal device for a carbon preheater according to claim 2, characterized in that, A high-temperature sealing gasket is used at the connection between the flange interface (8) and the input end of the positive pressure venting pipe (6).

4. The dust removal device for a carbon preheater according to claim 1, characterized in that, The ventilation main pipe (2) is connected to the output end of the positive pressure ventilator (6) via a reducing connector (9).

5. The dust removal device for a carbon preheater according to claim 4, characterized in that, The reducing connector (9) has a tapered flared structure.

6. The dust removal device for a carbon preheater according to claim 1, characterized in that, The diameter of the ventilation main pipe (2) is larger than that of the positive pressure ventilator (6).

7. The dust removal device for a carbon preheater according to claim 1, characterized in that, Also includes: Pressure sensor (10) installed on the conveying pipe (4).

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