Coal powder preparation and delivery system

Abstract

The utility model discloses a kind of pulverized coal preparation conveying systems, including the coal receiving hopper for receiving raw coal, the bottom discharge end of the coal receiving hopper is sequentially provided with belt scale and belt conveyor along pulverized coal conveying direction, the feed end of the belt scale is connected with the discharge port of the coal receiving hopper to measure raw coal conveying capacity, the feed end of the belt conveyor is connected with the discharge end of the belt scale, and the discharge end of the belt conveyor is communicated with the feed port of the coal mill through the blanking tube, the present pulverized coal preparation conveying system accurately measures and removes impurities, the coal receiving hopper and the belt conveyor are additionally provided with belt scale, realize raw coal conveying capacity real-time measurement, provide data support for subsequent grinding load regulation, iron remover is arranged above the feed end of the belt conveyor, which can efficiently adsorb metal impurities, reduce the abrasion rate of the coal mill, prolong the equipment maintenance cycle, the coal mill is connected with the hot blast furnace through the hot air pipeline with temperature control valve, dry hot air with controllable temperature can be introduced, to avoid raw coal caking, improve grinding efficiency.

Description

Technical Field

[0001] This utility model relates to the field of coal processing technology, specifically to a coal powder preparation and conveying system. Background Technology

[0002] In the application scenarios of pulverized coal in the fields of power, metallurgy, and chemical industry, the pulverized coal preparation and conveying system needs to achieve the continuous operation of the entire process of "raw coal receiving - grinding - sorting - purification - storage - conveying". However, the existing pulverized coal preparation and conveying system has poor operational stability, high energy consumption, and prominent safety risks, making it difficult to meet the industrial production requirements for "efficient, accurate and safe" pulverized coal preparation. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the existing defects and provide a coal powder preparation and conveying system that facilitates accurate measurement and impurity removal of coal powder, while also enabling efficient grinding and sorting of coal powder, and achieving safe conveying and efficient collection of coal powder, thus effectively solving the problems in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: A coal powder preparation and conveying system includes a coal receiving hopper for receiving raw coal. A belt scale and a belt conveyor are sequentially arranged at the bottom discharge end of the coal receiving hopper along the coal powder conveying direction. The feed end of the belt scale is connected to the discharge port of the coal receiving hopper to measure the amount of raw coal conveyed. The feed end of the belt conveyor is connected to the discharge end of the belt scale. A coal mill is installed below the discharge end of the belt conveyor, and the discharge end of the belt conveyor is connected to the feed inlet of the coal mill through a discharge pipe; the bottom discharge port of the coal mill is connected to the feed end of the dynamic classifier through a first discharge pipe, so as to transport the ground coal powder to the dynamic classifier for coarse and fine separation. The bottom discharge port of the dynamic air classifier is connected to the feed end of the second dust collector through a second discharge pipe. The coal powder discharge port of the second dust collector is connected to the feed end of the first coal powder dust collector through a coal powder conveying pipe. The bottom coal powder discharge port of the first coal powder dust collector is connected to the coal powder silo through a third discharge pipe to store the separated and collected coal powder in the coal powder silo. The bottom discharge port of the pulverized coal silo is connected to the feed end of the injection tank through a fourth discharge pipe. A rotary feed pump is installed at the bottom discharge port of the injection tank. The discharge port of the rotary feed pump is connected to a pulverized coal discharge pipe. A blower is installed at the end of the pulverized coal discharge pipe to provide power to transport the pulverized coal to the target end.

[0005] As a preferred technical solution of this utility model, an iron remover is installed above the conveyor belt of the belt conveyor and near its feed end. The adsorption surface of the iron remover is parallel to the surface of the conveyor belt and the distance between them is 5-15cm, so as to remove metal impurities in the raw coal.

[0006] As a preferred embodiment of this utility model, the hot air inlet of the coal mill is connected to the hot air outlet of the hot air furnace through a hot air pipe. A temperature control valve is installed on the hot air pipe to introduce dry hot air with controllable temperature into the coal mill to prevent the raw coal from caking during the grinding process.

[0007] As a preferred technical solution of this utility model, an airlock valve is installed between the bottom discharge port of the dynamic classifier and the second discharge pipe. The airlock valve is a star-shaped discharge airlock valve to maintain a negative pressure environment inside the dynamic classifier when discharging coarse powder.

[0008] As a preferred embodiment of this utility model, the middle section of the pulverized coal conveying pipeline is connected to the outlet of the inert gas storage tank via an inert gas branch pipe. A pressure regulating valve is installed on the inert gas branch pipe to inject inert gas into the pulverized coal conveying pipeline, thereby reducing the oxygen concentration in the pipeline and preventing spontaneous combustion of pulverized coal.

[0009] As a preferred embodiment of this utility model, the top air outlet of the first pulverized coal dust collector is connected to a dust collecting fan through an air duct. A negative pressure channel is formed between the dust collecting fan and the first pulverized coal dust collector to promote gas-solid separation of pulverized coal in the first pulverized coal dust collector and improve pulverized coal collection efficiency.

[0010] Compared with the prior art, the beneficial effects of this utility model are: 1. Precise metering and impurity removal: A belt scale is added between the coal receiving hopper and the belt conveyor to achieve real-time metering of raw coal conveying volume, providing data support for subsequent grinding load control. An iron remover is installed above the feed end of the belt conveyor to efficiently adsorb metal impurities, reduce the wear rate of the coal mill, and extend the equipment maintenance cycle. 2. Efficient grinding and sorting: The coal mill is connected to the hot air furnace through a hot air pipe with a temperature control valve, which can introduce dry hot air with controllable temperature to avoid raw coal agglomeration and improve grinding efficiency. A star-shaped discharge airlock valve is installed at the discharge end of the dynamic classifier to maintain internal negative pressure when discharging coarse powder, ensuring improved separation accuracy of coarse and fine powder and reducing energy consumption of coarse powder circulation. 3. Safe transportation and efficient collection: The coal powder transportation pipeline is connected to the storage tank through an inert gas branch pipe with a pressure regulating valve. Inert gases such as nitrogen can be injected to reduce the oxygen concentration in the pipeline and eliminate the risk of spontaneous combustion. The top of the first coal powder dust collector is equipped with a dust receiving fan to form a negative pressure channel, which improves the gas-solid separation efficiency, reduces the loss of fine powder, and reduces the tail gas treatment pressure. 4. The entire process is coordinated and stable. Each link is precisely connected through pipelines, such as the pipeline adaptation design between the coal mill and the dynamic classifier, and between the dust collector and the coal powder silo. Combined with the quantitative discharge of the injection tank and the rotary feed pump, the "receiving-grinding-transporting" process is completed without material blockage, which improves the overall stability of the system and reduces energy consumption. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of this utility model.

[0012] In the diagram: 1. Coal receiving hopper; 2. Belt scale; 3. Belt conveyor; 4. Iron separator; 5. Inert gas storage tank; 6. Pulverized coal conveying pipeline; 7. Dynamic air classifier; 8. Airlock valve; 9. First pulverized coal dust collector; 10. Dust collecting fan; 11. Pulverized coal silo; 12. Pulverized coal injection tank; 13. Rotary feed pump; 14. Pulverized coal blower; 15. Hot air furnace; 16. Coal mill; 17. Second dust collector; 18. Pulverized coal discharge pipeline. Detailed Implementation

[0013] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0014] Please see Figure 1 This utility model provides a technical solution: A coal powder preparation and conveying system includes a coal receiving hopper 1 for receiving raw coal. A belt scale 2 and a belt conveyor 3 are sequentially arranged at the bottom discharge end of the coal receiving hopper 1 along the coal powder conveying direction. The feed end of the belt scale 2 is connected to the discharge port of the coal receiving hopper 1 to measure the amount of raw coal conveyed. The feed end of the belt conveyor 3 is connected to the discharge end of the belt scale 2. A coal mill 16 is installed below the discharge end of the belt conveyor 3, and the discharge end of the belt conveyor 3 is connected to the feed inlet of the coal mill 16 through a discharge pipe; the bottom discharge port of the coal mill 16 is connected to the feed end of the dynamic classifier 7 through a first discharge pipe, so as to transport the ground coal powder to the dynamic classifier 7 for coarse and fine separation. The bottom discharge port of the dynamic air classifier 7 is connected to the feed end of the second dust collector 17 through the second discharge pipe. The coal powder discharge port of the second dust collector 17 is connected to the feed end of the first coal powder dust collector 9 through the coal powder conveying pipe 6. The bottom coal powder discharge port of the first coal powder dust collector 9 is connected to the coal powder silo 11 through the third discharge pipe to store the separated and collected coal powder in the coal powder silo 11. The bottom discharge port of the pulverized coal bin 11 is connected to the feed end of the injection tank 12 through the fourth discharge pipe. A rotary feed pump 13 is installed at the bottom discharge port of the injection tank 12. The discharge port of the rotary feed pump 13 is connected to the pulverized coal discharge pipe 18. A blower 14 is installed at the end of the pulverized coal discharge pipe 18 to provide power to transport the pulverized coal to the target end.

[0015] A magnetic separator 4 is installed above the conveyor belt of the belt conveyor 3 and near its feed end. The adsorption surface of the magnetic separator 4 is parallel to the surface of the conveyor belt and the spacing is 5-15cm to remove metal impurities from the raw coal.

[0016] The hot air inlet of the coal mill 16 is connected to the hot air outlet of the hot air furnace 15 through a hot air pipe. A temperature control valve is installed on the hot air pipe to introduce dry hot air with controllable temperature into the coal mill 16 to prevent the raw coal from caking during the grinding process.

[0017] An airlock valve 8 is installed between the bottom discharge port of the dynamic classifier 7 and the second discharge pipe. The airlock valve 8 is a star-shaped discharge airlock valve to maintain a negative pressure environment inside the dynamic classifier 7 when discharging coarse powder.

[0018] The middle section of the pulverized coal conveying pipeline 6 is connected to the outlet of the inert gas storage tank 5 via an inert gas branch pipe. A pressure regulating valve is installed on the inert gas branch pipe to inject inert gas, such as nitrogen, into the pulverized coal conveying pipeline 6 to reduce the oxygen concentration in the pipeline and prevent spontaneous combustion of pulverized coal.

[0019] The top air outlet of the first coal dust collector 9 is connected to a dust collection fan 10 through an air duct. A negative pressure channel is formed between the dust collection fan 10 and the first coal dust collector 9 to promote gas-solid separation of coal dust in the first coal dust collector 9 and improve coal dust collection efficiency.

[0020] This system can be integrated with a cooling system to supply cooling water to equipment such as the coal mill 16, the first coal dust collector 9, and the second dust collector 17 via cooling water supply pipes.

[0021] Working principle of this pulverized coal preparation and conveying system: Raw coal receiving and pre-processing: The raw coal first enters the coal receiving hopper 1 for temporary storage. The bottom discharge end of the coal receiving hopper 1 transports the raw coal to the belt scale 2. After the belt scale 2 measures the amount of raw coal, it is transferred to the belt conveyor 3. At the same time, the iron remover 4 at the feed end of the belt conveyor 3 adsorbs the metal impurities in the raw coal. The pre-processed raw coal enters the coal mill 16 through the discharge pipe. Grinding and coarse-fine separation: Hot air is introduced into the coal mill 16 through the hot air pipe with a temperature control valve in the hot air furnace 15. The raw coal is ground into coal powder in the hot air environment. The ground coal powder enters the dynamic classifier 7 through the first discharge pipe. The dynamic classifier 7 separates the coal powder into coarse and fine powder. The separated coarse powder is discharged through the second discharge pipe with a bottom air lock valve 8 (it can be returned to the coal mill for secondary grinding), while the fine powder enters the second dust collector 17. Coal powder purification and safe transportation: The second dust collector (17) performs preliminary purification of the fine powder and removes some dust impurities. The fine powder is then transported through the coal powder conveying pipeline 6. At this time, the inert gas storage tank 5 injects inert gas into the coal powder conveying pipeline 6 through the branch pipe with a pressure regulating valve to reduce the oxygen concentration in the pipeline. Subsequently, the fine powder enters the first coal powder dust collector 9. The dust collection fan 10 forms a negative pressure in the dust collector through the induced draft pipe to accelerate gas-solid separation. The separated pure coal powder enters the coal powder silo 11 for storage through the third discharge pipe. The coal powder is quantitatively output. The coal powder in the coal powder silo 11 enters the injection tank 12 through the fourth discharge pipe. The rotary feed pump 13 at the bottom of the injection tank 12 quantitatively delivers the coal powder to the coal powder discharge pipe 18. Finally, the blower 14 at the end of the coal powder discharge pipe provides power to stably deliver the coal powder to the target end such as the boiler and gasifier, completing the whole process of preparation and transportation.

[0022] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A coal powder preparation and conveying system, comprising a coal receiving hopper (1) for receiving raw coal, characterized in that: The bottom discharge end of the coal receiving hopper (1) is provided with a belt scale (2) and a belt conveyor (3) in sequence along the coal powder conveying direction. The feed end of the belt scale (2) is connected to the discharge port of the coal receiving hopper (1), and the feed end of the belt conveyor (3) is connected to the discharge end of the belt scale (2). A coal mill (16) is installed below the discharge end of the belt conveyor (3), and the discharge end of the belt conveyor (3) is connected to the feed inlet of the coal mill (16) through a drop pipe; the bottom discharge port of the coal mill (16) is connected to the feed end of the dynamic classifier (7) through a first discharge pipe. The bottom discharge port of the dynamic classifier (7) is connected to the feed end of the second dust collector (17) through the second discharge pipe, and the coal powder discharge port of the second dust collector (17) is connected to the feed end of the first coal powder dust collector (9) through the coal powder conveying pipe (6); the bottom coal powder discharge port of the first coal powder dust collector (9) is connected to the coal powder silo (11) through the third discharge pipe. The bottom discharge port of the pulverized coal bin (11) is connected to the feed end of the injection tank (12) through the fourth discharge pipe. A rotary feed pump (13) is installed at the bottom discharge port of the injection tank (12). The discharge port of the rotary feed pump (13) is connected to a pulverized coal discharge pipe (18). A blower (14) is installed at the end of the pulverized coal discharge pipe (18).

2. The pulverized coal preparation and conveying system according to claim 1, characterized in that: A magnetic separator (4) is installed above the conveyor belt of the belt conveyor (3) and near its feed end. The adsorption surface of the magnetic separator (4) is parallel to the surface of the conveyor belt and the distance between them is 5-15cm.

3. The pulverized coal preparation and conveying system according to claim 1, characterized in that: The hot air inlet of the coal mill (16) is connected to the hot air outlet of the hot air furnace (15) through a hot air pipe, and a temperature control valve is installed on the hot air pipe.

4. The pulverized coal preparation and conveying system according to claim 1, characterized in that: An airlock valve (8) is installed between the bottom discharge port of the dynamic air classifier (7) and the second discharge pipe. The airlock valve (8) is a star-shaped discharge airlock valve.

5. The pulverized coal preparation and conveying system according to claim 1, characterized in that: The middle section of the pulverized coal conveying pipeline (6) is connected to the outlet of the inert gas storage tank (5) through an inert gas branch pipe, and a pressure regulating valve is installed on the inert gas branch pipe.

6. The pulverized coal preparation and conveying system according to claim 1, characterized in that: The top air outlet of the first coal dust collector (9) is connected to a dust collection fan (10) through an air duct, and a negative pressure channel is formed between the dust collection fan (10) and the first coal dust collector (9).

Images