Coal dust collecting system for improving dust collecting effect and improving stable feeding performance

Abstract

The application relates to the technical field of cement production, and discloses a coal powder collecting system capable of improving dust collecting effect and improving stable feeding performance. A negative pressure pipe is arranged at a steady flow bin, and is matched with a secondary dust collecting pipe, a main dust collecting pipe and other components, so that the positive pressure of the upper steady flow bin of a rotor scale can be eliminated, and the steady flow bin is ensured to be in a micro-negative pressure state. The application also comprises a closed loop control formed by cooperation of a pressure transmitter, an electric butterfly valve, a PLC control box and other equipment, so that the micro-negative pressure state in the steady flow bin can be accurately controlled, the closed loop control is simple and efficient, and the automation degree is improved. Single machine dust collecting devices, electromagnetic closed valves and standby dust collecting pipes are arranged, so that the single machine dust collecting devices can be started when the main dust collecting equipment is stopped or overhauled. After the single machine dust collecting devices are started, negative pressure can be generated, the steady flow bin is formed into a negative pressure state, the steady flow bin is eliminated, and the whole equipment can still be used when the main dust collecting equipment is stopped.

Description

Technical Field

[0001] This application relates to the field of cement production technology, specifically to a coal powder collection system that improves dust collection efficiency and enhances stable feeding performance. Background Technology

[0002] The calcination of raw materials in cement production consumes a large amount of heat, which comes from the combustion of pulverized coal. Raw coal needs to be ground into powder by a coal mill and stored in a pulverized coal silo. It is then quantitatively fed into the conveying equipment via a rotor scale and transported to the rotary kiln for use. In existing technology, some raw coal still retains 6-9% moisture in the pulverized coal silo after grinding, making it impossible to completely dry. This leads to dust clogging in the rotor scale's dust collection bags and pipe blockage. Furthermore, the excessively large rotor clearance results in poor airlock performance, causing the flow stabilization silo above the rotor scale to remain under positive pressure, leading to uncontrolled silo weight, poor coal feeding stability, passive central control operation, and frequent instances of pulverized coal explosions in the coal decomposition furnace. Utility Model Content

[0003] In view of the above problems, this application provides a coal powder collection system that improves dust collection effect and enhances stable feeding performance. It can improve the existing dust collection effect and adjust the air pressure in the stabilizing chamber to achieve a slightly negative pressure state.

[0004] According to one aspect of the embodiments of this application, a coal powder collection system for improving dust collection efficiency and enhancing stable feeding performance is provided. The coal powder collection system for improving dust collection efficiency and enhancing stable feeding performance includes a coal mill, a main dust collection device, a coal powder silo, a PLC control box, and individual dust collection devices. The coal mill is connected to the inlet end of the main dust collection device via a main dust collection pipe. A screw conveyor is connected to the bottom of the main dust collection device. The outlet end of the screw conveyor is connected to the top of the coal powder silo via a discharge pipe. A flow stabilizing chamber is connected to the bottom end of the coal powder silo. A rotor scale is connected to the bottom end of the flow stabilizing chamber. The top cover of the flow stabilizing chamber... A negative pressure pipe is connected to the main dust collection pipe via a secondary dust collection pipe. A pressure transmitter and an electric butterfly valve are installed at the secondary dust collection pipe. Both the pressure transmitter and the electric butterfly valve are electrically connected to the PLC control box. A backup dust collection pipe is connected to the middle of the secondary dust collection pipe between the electric butterfly valve and the negative pressure pipe. The single-unit dust collection device is connected to the end of the backup dust collection pipe away from the secondary dust collection pipe. An electromagnetic shut-off valve is installed at the backup dust collection pipe.

[0005] In some embodiments, there are multiple pulverized coal bins, and the top discharge pipes of the multiple pulverized coal bins are connected to the discharge pipe through a multi-port pipe and a valve body.

[0006] In some embodiments, a conical groove is formed at the bottom of the pulverized coal bin, and a backflushing device is provided in the conical groove.

[0007] In some embodiments, the backflush device includes an aeration ring connected to the conical groove by a rod, a plurality of backflush pipes are provided on the outer side wall of the aeration ring, and the aeration ring is externally connected to a pressurized air supply device through a pipe.

[0008] In some embodiments, the single-unit dust collection device is a baghouse dust collector.

[0009] In some embodiments, the main dust collection device is a pulse bag filter.

[0010] The beneficial effects of this application are as follows: In this application, by setting a negative pressure pipe at the stabilizing chamber and cooperating with auxiliary dust collection pipes and main dust collection pipes, the positive pressure in the upper stabilizing chamber of the rotor scale can be reduced, ensuring a slightly negative pressure state within the stabilizing chamber. Since the coal mill, main dust collection pipe, and main dust collection equipment are all existing technologies, this method of reducing airflow in the stabilizing chamber does not require additional energy consumption. In this embodiment, a pressure transmitter, electric butterfly valve, and PLC control box are also used to form a closed-loop control system, precisely controlling and adjusting the slightly negative pressure state within the stabilizing chamber, resulting in simplicity, efficiency, and improved automation. Furthermore, by setting up a single-unit dust collection device, an electromagnetic sealing valve, and a spare dust collection pipe, this device can be activated when the main dust collection equipment is shut down or under maintenance. When activated, the single-unit dust collection device generates negative pressure, creating negative pressure within the stabilizing chamber to reduce airflow, ensuring the entire equipment can still be used even when the main dust collection equipment is shut down.

[0011] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0012] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0013] Figure 1 This is a schematic diagram of the overall system flow structure provided in the embodiments of this application;

[0014] Figure 2 This is a schematic diagram of a partial cross-sectional structure of the backflush device provided in an embodiment of this application.

[0015] The reference numerals in the detailed embodiments are as follows:

[0016] A coal powder collection system 100 that improves dust collection efficiency and enhances stable feeding performance includes a coal mill 110, a main dust collection device 120, a screw conveyor 121, a feed pipe 122, a coal powder silo 130, a flow stabilizing silo 131, a negative pressure pipe 132, a conical trough 133, a back-blowing device 134, an aeration ring 134a, a back-blowing pipe 134b, a booster air supply device 134c, a single-unit dust collection device 140, a secondary dust collection pipeline 150, a pressure transmitter 151, an electric butterfly valve 152, a spare dust collection pipe 160, and an electromagnetic shut-off valve 161. Detailed Implementation

[0017] The embodiments of the technical solution of this application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of this application, and are therefore merely examples and should not be used to limit the scope of protection of this application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this application; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and the foregoing description of the accompanying drawings are intended to cover non-exclusive inclusion.

[0018] For details, please refer to Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of the overall system flow structure provided in the embodiments of this application. Figure 2This is a partial cross-sectional structural diagram of the backflushing device provided in an embodiment of this application. The coal powder collection system 100, which improves dust collection efficiency and enhances stable feeding performance, includes a coal mill 110, a main dust collector 120, a coal powder silo 130, a PLC control box, and a single-unit dust collector 140. The coal mill 110 is used to grind lumpy or granular raw coal into coal powder of the required particle size through extrusion, grinding, or other methods. Generally, the fineness of the coal powder is required to reach an 80μm sieve residue of no more than 10% to ensure complete combustion in the cement kiln and improve combustion efficiency. The main dust collector 120 can be a pulse bag filter. The main dust collector 120 is existing technology and has been fully disclosed, so it will not be described in detail here. The coal mill 110 is connected to the inlet end of the main dust collector 120 via a main dust collection pipe, allowing the coal powder produced by the coal mill 110 to be directly drawn into the main dust collector 120 through the main dust collection pipe. A screw conveyor 121 is connected to the bottom of the main dust collection device 120. After the coal dust absorbed by the main dust collection device 120 separates from the air inside, the coal dust will settle at the bottom of the main dust collection device 120 and be conveyed outwards by the screw conveyor 121. The outlet end of the screw conveyor 121 is connected to the top of the coal dust silo 130 via a discharge pipe 122. The coal dust absorbed by the main dust collection device 120 will enter the coal dust silo 130 for secondary use through the discharge pipe 122 below the screw conveyor 121, avoiding waste. A flow stabilizing chamber 131 is connected to the bottom of the coal dust silo 130. The flow stabilizing chamber 131 is existing equipment, mainly used to buffer fluctuations in the discharge from the coal dust silo 130, allowing the pulverized coal to enter the subsequent equipment at a relatively stable flow rate. This avoids sudden changes in the feed rate due to changes in the material level within the coal dust silo 130 and the fluidity of the pulverized coal, ensuring the stability of the pulverized coal supply during production and facilitating the stable operation of subsequent processes. A rotor scale is connected to the bottom of the stabilizing chamber 131. The rotor scale is mainly used for continuous metering and quantitative feeding of pulverized coal. It should be noted that when the rotor scale is working, its internal rotor and blades rotate, causing air to enter the stabilizing chamber 131 and creating positive pressure within it. A negative pressure pipe 132 is connected to the top cover of the stabilizing chamber 131. The end of the negative pressure pipe 132 is connected to the main dust collection pipe through the auxiliary dust collection pipe 150. During the operation of the main dust collection equipment 120, a negative pressure is generated. This negative pressure is then extracted from the stabilizing chamber 131 through the negative pressure pipe 132 and the main dust collection pipe, thereby creating a slight negative pressure inside the stabilizing chamber 131, eliminating the positive pressure within the stabilizing chamber 131, and facilitating the stable operation of components such as the rotor scale. A pressure transmitter 151 and an electric butterfly valve 152 are installed at the auxiliary dust collection duct 150. Both the pressure transmitter 151 and the electric butterfly valve 152 are electrically connected to the PLC control box. The pressure transmitter 151 is used to detect the air pressure inside the auxiliary dust collection duct 150 and transmit its signal to the PLC control box.The opening of the electric butterfly valve 152 is adjustable, thereby changing the air pressure inside the auxiliary dust collection pipe and the stabilizing chamber 131. A backup dust collection pipe 160 is connected to the middle of the auxiliary dust collection pipe, located between the electric butterfly valve 152 and the negative pressure pipe 132. A standby dust collection device 140 is connected to the end of the standby dust collection pipe 160 furthest from the auxiliary dust collection pipe; this standby dust collection device 140 can be a bag filter, etc. An electromagnetic shut-off valve 161 is installed at the standby dust collection pipe 160. The electromagnetic shut-off valve 161 controls the connection between the laying hen dust collection device and each stabilizing chamber 131.

[0019] In this embodiment, the working process is as follows: the pulverized coal produced by the coal mill 110 is transported to the main dust collection equipment 120 through the main dust collection pipeline. After being filtered and collected, it is transported to the pulverized coal silo 130 for storage via the screw conveyor 121 and the discharge pipe 122. When the rotary kiln needs material, the material in the pulverized coal silo 130 is weighed by the stabilizing chamber 131 and the rotor scale before being discharged. At this time, the electric butterfly valve 152 is opened, and the main dust collection pipeline is under negative pressure. A small amount of pulverized coal and air in the stabilizing chamber 131 enters the main dust collection pipeline through the dust collection pipe and the auxiliary dust collection pipeline 150, thereby completing the air removal in the stabilizing chamber 131. The pressure transmitter 151 detects the air pressure at the auxiliary dust collection pipeline 150 and transmits the electrical signal to the PLC control box. After receiving the corresponding electrical signal, the PLC control box controls the electric butterfly valve 152 to change its opening degree, thereby adjusting the air pressure at the auxiliary dust collection pipeline 150 and the stabilizing chamber 131. The entire process constitutes a closed-loop control. When the main dust collection device 120 stops, the electric butterfly valve 152 is closed and the electromagnetic sealing valve 161 at the standby dust collection pipe 160 is opened to connect the single dust collection device 140 and the dust collection pipe, and the single dust collection device 140 is used to reduce airflow in the flow stabilizing chamber 131.

[0020] In this embodiment, by setting a negative pressure pipe 132 at the stabilizing chamber 131 and cooperating with the auxiliary dust collection pipe 150 and the main dust collection pipe, the positive pressure in the upper stabilizing chamber 131 of the rotor scale can be reduced, ensuring that the stabilizing chamber 131 is in a slightly negative pressure state. Since the coal mill 110, the main dust collection pipe, and the main dust collection equipment 120 are all existing technologies, this method of reducing airflow in the stabilizing chamber 131 does not require additional energy consumption. In this embodiment, a pressure transmitter 151, an electric butterfly valve 152, and a PLC control box are also used to form a closed-loop control, which precisely controls and adjusts the slightly negative pressure state in the stabilizing chamber 131, making it simple, efficient, and improving the degree of automation. In this application, by setting up a single dust collection device 140, an electromagnetic shut-off valve 161 and a spare dust collection pipe 160, etc., the device can be turned on when the main dust collection device 120 is stopped or under maintenance. When the single dust collection device 140 is turned on, it can generate negative pressure and form negative pressure in the flow stabilization chamber 131 to eliminate airflow, so that the whole device can still be used when the main dust collection device 120 is stopped.

[0021] In some embodiments, there are multiple pulverized coal bins 130, and the top discharge pipes 122 of the multiple pulverized coal bins 130 are connected to the discharge pipe 122 through a multi-port pipe and a valve body. In this embodiment, by setting multiple pulverized coal bins 130, the storage capacity of pulverized coal is increased, avoiding problems such as overall equipment shutdown caused by a single pulverized coal bin 130 being full.

[0022] In some embodiments, a conical groove 133 is formed at the bottom of the pulverized coal silo 130, and a backflushing device 134 is provided in the conical groove 133. In this embodiment, by providing the backflushing device 134 to blow air into the conical groove 133, the pulverized coal adhering to the wall of the pulverized coal silo 130 can be blown off and fall into the stabilizing flow silo 131, and then transported to the rotary kiln for use by the corresponding transfer equipment, thus avoiding the phenomenon of pulverized coal adhering to the pulverized coal silo for a long time.

[0023] In some embodiments, the backflushing device 134 includes an aeration ring 134a connected to the conical groove 133 by a rod. Multiple backflushing pipes 134b are provided on the outer wall of the aeration ring 134a. The aeration ring 134a is externally connected to a pressurized air supply device 134c via a pipe. For ease of explanation, this application embodiment provides a specific configuration of the backflushing device 134. During operation, the pressurized air supply device 134c blows high-pressure airflow into the backflushing pipes 134b, which then blows it out onto the inner wall of the coal powder silo 130, further dislodging the coal powder adhering to the inside of the coal powder silo 130.

[0024] In some embodiments, the stand-alone dust collection device 140 is a baghouse dust collector.

[0025] In some embodiments, the main dust collection device 120 is a pulse bag filter.

[0026] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although the foregoing embodiments have provided a detailed description of this application, 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. These 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 this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A coal powder collection system for improving dust collection efficiency and enhancing stable feeding performance, characterized in that, This includes coal mills, main dust collection equipment, pulverized coal silos, PLC control boxes, and individual dust collection units; The coal mill is connected to the inlet of the main dust collection equipment via a main dust collection pipe. The bottom of the main dust collection equipment is connected to a screw conveyor. The outlet of the screw conveyor is connected to the top of the pulverized coal silo via a discharge pipe. The bottom of the pulverized coal silo is connected to a flow stabilizing chamber. The bottom of the flow stabilizing chamber is connected to a rotor scale. The top cover of the flow stabilizing chamber is connected to a negative pressure pipe. The end of the negative pressure pipe is connected to the main dust collection pipe via a secondary dust collection pipe. A pressure transmitter and an electric butterfly valve are installed at the secondary dust collection pipe. Both the pressure transmitter and the electric butterfly valve are electrically connected to the PLC control box. The middle part of the auxiliary dust collection pipe is located between the electric butterfly valve and the negative pressure pipe and is connected to a backup dust collection pipe. The single-unit dust collection device is connected to the end of the backup dust collection pipe away from the auxiliary dust collection pipe, and an electromagnetic sealing valve is installed at the backup dust collection pipe.

2. The coal powder collection system for improving dust collection effect and enhancing stable feeding performance according to claim 1, characterized in that, There are multiple pulverized coal bins, and the top discharge pipes of the multiple pulverized coal bins are connected to the discharge pipe through a multi-port pipe and a valve body.

3. The coal powder collection system for improving dust collection effect and enhancing stable feeding performance according to claim 1, characterized in that, The bottom of the pulverized coal bin is formed with a conical groove, and a backflushing device is installed in the conical groove.

4. The pulverized coal collection system for improving dust collection effect and enhancing stable feeding performance according to claim 3, characterized in that, The backflush device includes an aeration ring connected to the conical groove by a rod. Multiple backflush pipes are provided on the outer wall of the aeration ring. The aeration ring is connected to a pressurized air supply device through a pipe.

5. The coal powder collection system for improving dust collection effect and enhancing stable feeding performance according to claim 1, characterized in that, The single-unit dust collection equipment is a baghouse dust collector.

6. The coal powder collection system for improving dust collection effect and enhancing stable feeding performance according to claim 1, characterized in that, The main dust collection equipment is a pulse bag filter.

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