Pulverized coal conveying system

Abstract

The utility model relates to the field of combustion systems, in particular to a pulverized coal conveying system which comprises a combustion furnace, a crusher and a circulating ventilation system, a conveying pipe is arranged between the crusher and the combustion furnace and communicated with the crusher and the combustion furnace, and the circulating ventilation system comprises an air inlet pipe, an air outlet pipe and a dust removal fan. An air inlet of the air inlet pipe penetrates through the combustion furnace to be communicated with the outside space, an air outlet of the air inlet pipe is communicated with an air inlet of the dust removal fan, an air outlet of the dust removal fan is communicated with an air inlet of the air outlet pipe, and an air outlet of the air outlet pipe is communicated with the material conveying pipe. The circulating ventilation system is arranged, air of the air inlet pipe is heated by the combustion furnace and then flows to the conveying pipe, pulverized coal in the conveying pipe is activated, accumulation of the pulverized coal in the pipeline is avoided, fuel is heated, the combustion efficiency of the fuel entering the combustion furnace is improved, and the utilization rate of the fuel is overall improved.

Description

Technical Field

[0001] This utility model relates to the field of combustion systems, and in particular to fuel delivery systems. Background Technology

[0002] Coal is one of the most common combustible fuels. Power plant boilers require very fine pulverized coal for combustion. Before coal lumps are used, they need to be ground to improve combustion efficiency. Currently, pulverized coal is crushed by a crusher, collected, and stored in fuel tanks. The pulverized coal is then fed into the combustion furnace through storage tanks, resulting in low feeding efficiency. Furthermore, some of the heat from the combustion furnace is dissipated into the air, making it difficult to recover and reuse, thus reducing energy utilization.

[0003] The technical problem to be solved by this application is: how to improve the fuel supply efficiency. Summary of the Invention

[0004] In order to overcome the shortcomings of the existing technology, the purpose of this utility model is to provide a pulverized coal conveying system.

[0005] The technical solution adopted by this utility model is as follows: a pulverized coal conveying system, including a combustion furnace, a crusher and a circulating ventilation system. A conveying pipe is provided between the crusher and the combustion furnace, and the conveying pipe connects the crusher and the combustion furnace. The circulating ventilation system includes an air inlet pipe, an air outlet pipe and a dust removal fan. The air inlet of the air inlet pipe passes through the combustion furnace and is connected to the external space. The air outlet of the air inlet pipe is connected to the air inlet of the dust removal fan. The air outlet of the dust removal fan is connected to the air inlet of the air outlet pipe. The air outlet of the air outlet pipe is connected to the conveying pipe.

[0006] In some embodiments, the discharge port of the conveying pipe is provided with several branch pipes, the inlet of the branch pipes is connected to the conveying pipe, and the discharge ports of the several branch pipes are evenly distributed at the bottom of the combustion furnace.

[0007] In some embodiments, the air inlet duct is provided with a dust removal port, and several dust removal ports are provided on the side wall of the air inlet duct. A dust removal ventilation valve is provided between the dust removal port and the air inlet duct.

[0008] In some implementations, the air outlet of the air inlet duct is equipped with an air inlet ventilation valve.

[0009] In some implementations, several crushers are provided, and the number of conveying pipes is the same as the number of crushers.

[0010] In some embodiments, the circulating ventilation system includes a distribution duct, the air inlet of which is connected to the air outlet of the dust removal fan, the distribution duct being provided with air outlets corresponding to the number of air outlets, and the air inlet of the air outlet being connected to one of the air outlets of the distribution duct.

[0011] In some implementations, the crusher is positioned higher than the combustion furnace, and the feed pipe is inclined downwards from the crusher towards the combustion furnace.

[0012] In some implementations, a cleaning pulse valve is provided between the crusher and the feed pipe.

[0013] The beneficial effects of this utility model are as follows:

[0014] This pulverized coal conveying system incorporates a circulating ventilation system. Air from the intake duct is heated by the combustion furnace and then flows into the conveying pipe, activating the pulverized coal within the pipe and preventing its accumulation. This process heats the fuel, improving combustion efficiency after it enters the combustion furnace, thus enhancing overall fuel utilization. Furthermore, since the pulverized coal from the crusher flows directly into the combustion furnace through the conveying pipe, the pulverized coal collection steps are reduced, further improving the overall system efficiency. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model.

[0016] The labels and names in the diagram correspond as follows: 1. Combustion furnace; 2. Crusher; 3. Circulating ventilation system; 11. Air inlet; 21. Conveying pipe; 22. Distributing pipe; 23. Cleaning pulse valve; 31. Air inlet pipe; 32. Distributing pipe; 33. Air outlet pipe; 34. Dust removal fan; 311. Dust removal port. Detailed Implementation

[0017] 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.

[0018] Please see Figure 1This utility model provides a technical solution: a pulverized coal conveying system, including a combustion furnace 1, a crusher 2, and a circulating ventilation system 3. The crusher 2 is responsible for crushing coal lumps into smaller pulverized coal powder or particles, and the combustion furnace 1 is responsible for burning the crushed pulverized coal. A conveying pipe 21 is provided between the crusher 2 and the combustion furnace 1, connecting the crusher 2 and the combustion furnace 1. The inlet of the conveying pipe 21 is connected to the outlet of the crusher 2, and the outlet of the conveying pipe 21 is connected to the inlet of the combustion furnace 1. There are three crushers 2, and the number of conveying pipes 21 is the same as the number of crushers 2. To prevent the accumulation of pulverized coal in the combustion furnace 1, the outlet of the conveying pipe 21 is provided with several distribution pipes 22. The inlet of the distribution pipe 22 is connected to and communicates with the conveying pipe 21. The outlets of the several distribution pipes 22 are evenly distributed at the bottom of the combustion furnace 1. Pulverized coal reaches various positions at the bottom of the combustion furnace 1 through the conveying pipe 21 and the distribution pipes 22.

[0019] The crusher 2 is positioned higher than the combustion furnace 1, so the conveying pipe 21 is inclined downward from the crusher 2 towards the combustion furnace 1, and the pulverized coal can move downward towards the combustion furnace 1 due to gravity.

[0020] The combustion furnace 1 is provided with an air inlet 11, through which outside air enters the combustion furnace 1.

[0021] The circulating ventilation system 3 includes an inlet duct 31, a distribution duct 32, an outlet duct 33, and a dust removal fan 34. The inlet duct 31 passes through the top of the combustion furnace 1, and its inlet is connected to the outside space after passing through the top of the combustion furnace 1. The outlet of the inlet duct 31 is connected to the inlet of the dust removal fan 34. The inlet duct 31 is equipped with dust removal ports 311, and several dust removal ports 311 are located on the side wall of the inlet duct 31. A dust removal ventilation valve is installed between the dust removal ports 311 and the inlet duct 31, and the dust removal ventilation valve controls the air volume flowing through the dust removal ports per unit time. The outlet of the inlet duct 31 is equipped with an inlet ventilation valve, which controls the total air volume flowing through the inlet duct 31 per unit time. By controlling the dust removal ventilation valve and the inlet ventilation valve, the air volume at the inlet of the inlet duct per unit time can be controlled, and the air temperature passing through the dust removal fan 34 can also be controlled. The air inlet 31 of the distribution duct 32 is connected to the air outlet of the dust removal fan 34. The distribution duct 32 is provided with air outlets corresponding to the number of air outlet ducts 33. The air inlet of the air outlet duct 33 is connected to one of the air outlets of the distribution duct 32. The air outlet of the air outlet duct 33 is connected to and communicates with the conveying pipe 21. The dust removal fan 34 removes dust from the air from the air inlet duct 31. The dust-removed air is blown upwards through the distribution duct 32 onto the conveying pipe 21, thereby agitating the coal powder in the conveying pipe 21 and preventing the coal powder from settling. Moreover, the air flows back to the combustion furnace 1 through the conveying pipe 21 and the distribution duct 22. Dust-laden air is drawn out of the combustion environment by the dust removal fan 34, which also accelerates airflow near the combustion furnace 1. Because the air carries a high temperature, the air after dust removal remains warm. This air, accelerated by the dust removal fan 34, enters the feed pipe 21, activating and heating the pulverized coal within it, thus improving the combustion efficiency of the fuel entering the combustion furnace 1. Therefore, the circulating ventilation system 3 can effectively remove dust from the combustion furnace environment, accelerate airflow within the combustion furnace 1, activate the pulverized coal in the feed pipe 21, prevent coal dust deposition, heat the fuel, and improve the combustion efficiency of the fuel entering the combustion furnace 1.

[0022] In order to clean the residual coal powder in the conveying pipe 21, a cleaning pulse valve 23 is provided between the crusher 2 and the conveying pipe 21. The cleaning pulse valve 23 plays the role of backwashing and blowing away the residual material in the conveying pipe 21.

[0023] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A pulverized coal conveying system, characterized in that, The system includes a combustion furnace (1), a crusher (2), and a circulating ventilation system (3). A conveying pipe (21) is provided between the crusher (2) and the combustion furnace (1). The conveying pipe (21) connects the crusher (2) and the combustion furnace (1). The circulating ventilation system (3) includes an air inlet pipe (31), an air outlet pipe (33), and a dust removal fan (34). The air inlet of the air inlet pipe (31) passes through the combustion furnace (1) and is connected to the outside space. The air outlet of the air inlet pipe (31) is connected to the air inlet of the dust removal fan (34). The air outlet of the dust removal fan (34) is connected to the air inlet of the air outlet pipe (33). The air outlet of the air outlet pipe (33) is connected to the conveying pipe (21).

2. The pulverized coal conveying system according to claim 1, characterized in that, The discharge port of the conveying pipe (21) is provided with several distribution pipes (22), the inlet of the distribution pipe (22) is connected to the conveying pipe (21), and the discharge ports of the several distribution pipes (22) are evenly distributed at the bottom of the combustion furnace (1).

3. The pulverized coal conveying system according to claim 1, characterized in that, The air inlet pipe (31) is provided with a dust removal port (311), and several dust removal ports (311) are provided on the side wall of the air inlet pipe (31). A dust removal ventilation valve is provided between the dust removal port (311) and the air inlet pipe (31).

4. The pulverized coal conveying system according to claim 1, characterized in that, An air inlet ventilation valve is provided at the air outlet of the air inlet pipe (31).

5. The pulverized coal conveying system according to claim 1, characterized in that, The crusher (2) is provided in several units, and the number of conveying pipes (21) is the same as the number of crushers (2).

6. The pulverized coal conveying system according to claim 5, characterized in that, The circulating ventilation system (3) includes a distribution duct (32). The air inlet (31) of the distribution duct (32) is connected to the air outlet of the dust removal fan (34). The distribution duct (32) is provided with an air outlet corresponding to the number of air outlets (33). The air inlet of the air outlet (33) is connected to one of the air outlets of the distribution duct (32).

7. The pulverized coal conveying system according to claim 1, characterized in that, The crusher (2) is positioned higher than the combustion furnace (1), and the conveying pipe (21) is inclined downward from the crusher (2) towards the combustion furnace (1).

8. The pulverized coal conveying system according to claim 1, characterized in that, A cleaning pulse valve (23) is provided between the crusher (2) and the conveying pipe (21).

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