Coal dust preheating safety assurance device

Abstract

The utility model discloses a kind of coal powder preheating safety guarantee device, belong to coal powder preheater technical field. Including coal powder preheater, heating cavity is arranged in coal powder preheater, preheater flue gas inlet pipe and preheater flue gas outlet pipe that communicate with heating cavity are respectively arranged in the both sides of coal powder preheater, preheating branch pipe is arranged in heating cavity, coal powder preheater is provided with and preheating branch pipe communicates with the coal inlet pipe and the coal outlet pipe, inert gas release device is arranged on preheater flue gas inlet pipe, coal powder preheater is provided with pressure reducing assembly, spark monitoring device, pressure monitoring device and temperature monitoring device. The coal powder preheating safety guarantee device is intelligently monitored, intelligently prevented and intelligently controlled to the condition parameter that can cause dust explosion in coal powder preheater under the cooperation of inert gas release device, pressure reducing assembly and multiple monitoring devices, can kill the hidden danger of dust explosion in the embryonic state, can be in time handle the hidden danger caused by coal powder leakage.

Description

Technical Field

[0001] This utility model relates to the technical field of pulverized coal preheaters, specifically a pulverized coal preheating safety assurance device. Background Technology

[0002] Pulverized coal injection in blast furnaces involves directly injecting finely ground anthracite, bituminous coal, or a mixture of both into the furnace through the tuyeres. This replaces coke as a heat source and reducing agent, thereby reducing the coke ratio and lowering pig iron costs. It represents a major technological revolution in modern blast furnace smelting. Pulverized coal preheaters are currently the most commonly used preheating equipment for pulverized coal injection in blast furnaces.

[0003] Currently, the commonly used pulverized coal preheaters on the market are closed heating barrels. Multiple preheating branch pipes for pulverized coal flow are set inside the heating barrel, and heating chambers are set around the preheating branch pipes. High-temperature flue gas generated by a hot air furnace is introduced into the heating chambers to heat the pulverized coal in the preheating branch pipes. The preheated pulverized coal is then discharged through the coal outlet pipe of the heating barrel.

[0004] However, in practice, existing preheaters are not equipped with safety devices. When the preheater operates for extended periods, the continuous erosion of the preheating branch pipes by pulverized coal can lead to wear and leakage. If a leak occurs, the pulverized coal will be injected into the heating chamber inside the preheater. Since the heating chamber is a sealed structure, the pulverized coal inside will form a dust cloud. If the dust concentration in the confined space reaches more than 60%, and if the three conditions for a dust explosion are met, the preheater will experience a dust explosion with incalculable consequences.

[0005] To address this, we designed and developed this pulverized coal preheating safety device. When excessive levels of combustible gas, dust concentration, or temperature are detected inside the preheater heating chamber, this device can activate the inert gas release device to fill the heating chamber with inert gas, thus degrading the combustible gas. At the same time, it opens the pressure relief device, which can effectively reduce the incidence of dust explosion accidents caused by pulverized coal leakage in the heating chamber and play a good role in preventing dust explosions. Utility Model Content

[0006] The purpose of this invention is to provide a safety guarantee device for pulverized coal preheating to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A pulverized coal preheating safety device includes a pulverized coal preheater with a heating chamber inside. A preheater inlet pipe and a preheater outlet pipe, both communicating with the heating chamber, are respectively provided on both sides of the preheater. Multiple preheating branch pipes are provided within the heating chamber. A coal inlet pipe and a coal outlet pipe, both communicating with the preheating branch pipes, are provided on the pulverized coal preheater. An inert gas release device is provided on the preheater inlet pipe for releasing inert gas or nitrogen into the preheater inlet pipe. The pulverized coal preheater is equipped with a pressure-reducing component to lower the internal pressure of the heating chamber. The pulverized coal preheater is also equipped with a spark monitoring device, a pressure monitoring device, and a temperature monitoring device, which are used to monitor the spark, pressure, and temperature inside the heating chamber, respectively. The preheater flue gas pipe is equipped with a dust monitoring device and a gas monitoring device. The dust monitoring device is used to monitor the dust concentration at the preheater flue gas pipe, and the gas monitoring device is used to monitor the carbon monoxide concentration and oxygen content at the preheater flue gas pipe.

[0009] As a further preferred embodiment of this utility model: the inert gas release device includes an inert gas inlet main pipe, and the outlet end of the inert gas inlet main pipe is sequentially connected to a metal connecting hose, a one-way valve, a manual ball valve, a pneumatic ball valve, and an inert gas outlet main pipe. The inert gas outlet main pipe is provided with multiple outlet branch pipes that communicate with the flue gas inlet pipe of the preheater.

[0010] As a further preferred embodiment of this utility model: the pressure reduction component includes a preheater safety valve and a preheater explosion-proof hole installed on the pulverized coal preheater, both of which are connected to the heating chamber.

[0011] As a further preferred embodiment of this utility model: the spark monitoring device, the pressure monitoring device, and the temperature monitoring device are respectively a spark detector, a pressure sensor, and a temperature sensor.

[0012] As a further preferred embodiment of this utility model, the dust monitoring device is a dust detector.

[0013] As a further preferred embodiment of this utility model: the gas monitoring device includes a carbon monoxide detector and an oxygen content detector.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] This pulverized coal preheating safety device, through the cooperation of an inert gas release device, a pressure reduction component, and multiple monitoring devices, intelligently monitors, prevents, and controls the parameters that could cause dust explosions within the pulverized coal preheater. It can effectively nip dust explosion hazards in the bud, promptly address potential hazards caused by pulverized coal leaks, and prevent dust explosion accidents caused by unresolved pulverized coal leaks. The device features a scientific and reasonable design, a simple and novel structure, and solves the safety hazards of traditional pulverized coal preheaters, making it easy to promote and apply. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the pulverized coal preheating safety protection device of this utility model.

[0017] In the diagram: 1. Inert gas inlet main pipe; 2. Metal connecting hose; 3. Check valve; 4. Manual ball valve; 5. Pneumatic ball valve; 6. Inert gas outlet main pipe; 7. Outlet branch pipe; 8. Preheater flue gas inlet pipe; 9. Pulverized coal preheater; 10. Preheater safety valve; 11. Preheater explosion-proof hole; 12. Spark detector; 13. Preheating branch pipe; 14. Pressure sensor; 15. Temperature sensor; 16. Coal inlet pipe; 17. Dust detector; 18. Preheater flue gas outlet pipe; 19. Carbon monoxide detector; 20. Oxygen content detector; 21. Heating chamber; 22. Pulverized coal main pipe; 23. Coal outlet pipe. Detailed Implementation

[0018] 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. Example 1

[0019] Please see Figure 1 This embodiment provides a coal pulverized preheating safety device, including a coal pulverized preheater 9. A sealed heating chamber 21 is provided inside the coal pulverized preheater 9 for heating coal pulverized. A preheater inlet gas pipe 8 and a preheater outlet gas pipe 18, communicating with the heating chamber (21), are respectively provided on both sides of the coal pulverized preheater 9 for the introduction and discharge of high-temperature flue gas in the heating chamber 21. Multiple preheating branch pipes 13 are provided inside the heating chamber 21 for the flow of coal pulverized in the heating chamber 21. A coal inlet pipe 16 and a coal outlet pipe 23, communicating with the preheating branch pipes 13, are provided on the coal pulverized preheater 9. The above structure is a conventional and common structure of existing coal pulverized preheaters 9. To enable those skilled in the art to better understand the heating chamber 21, as... Figure 1As shown, by setting coal powder main pipes 22 on both sides of the heating chamber 21 that communicate with the coal inlet pipe 16 and the coal outlet pipe 23, and setting multiple preheating branch pipes 13 between the two coal powder main pipes 22, the two ends of the preheating branch pipes 22 are connected to the coal inlet pipe 16 and the coal outlet pipe 23.

[0020] In practical applications, pulverized coal enters the pulverized coal main pipe 22 connected to the pulverized coal main pipe 16 through the coal inlet pipe 16, and then enters multiple preheating branch pipes 13 through the pulverized coal main pipe 22, and then gathers into the pulverized coal main pipe 22 corresponding to the coal outlet pipe 23, and finally exits the pulverized coal preheater 9 through the coal outlet pipe 23; high-temperature flue gas enters the heating chamber 21 through the preheater flue gas inlet pipe 8 to heat the pulverized coal in the preheating branch pipes 13, and then exits the heating chamber 21 through the preheater flue gas outlet pipe 18.

[0021] like Figure 1 As shown in this application, an inert gas release device is provided on the preheater flue gas inlet pipe 8 to release inert gas or nitrogen into the preheater flue gas inlet pipe 8, allowing the inert gas or nitrogen to enter the heating chamber 21 with the flue gas, thereby achieving the purpose of fire extinguishing. Preferably, the inert gas release device includes an inert gas inlet main pipe 1, and the outlet end of the inert gas inlet main pipe 1 is sequentially connected to a metal connecting hose 2, a one-way valve 3, a manual ball valve 4, a pneumatic ball valve 5, and an inert gas outlet main pipe 6. The inert gas outlet main pipe 6 is provided with multiple outlet branch pipes 7 that communicate with the preheater flue gas inlet pipe 8. It should be noted that, as is common knowledge familiar to those skilled in the art, the inlet end of the inert gas inlet main pipe 1 should be connected to an external inert gas cylinder or nitrogen cylinder or other conventional equipment for storing inert gas or nitrogen to supply inert gas or nitrogen. A gas pump can also be installed at the cylinder outlet to achieve positive pressure gas delivery. Meanwhile, the inert gas release device should be a conventional gas release device well known to those skilled in the art, and should not be limited to the preferred embodiment provided in this application. Other conventional gas release devices familiar to those skilled in the art should also be within the scope of protection claimed in this application. Furthermore, the shape of the inert gas outlet main pipe 6 will not be further specified in this application; a ring-shaped pipe is preferred, which is arranged around the outside of the preheater flue gas inlet pipe 8.

[0022] Furthermore, a pressure-reducing assembly for lowering the internal pressure of the heating chamber 21 is also provided on the pulverized coal preheater 9. This assembly includes a preheater safety valve 10 and a preheater explosion-proof port 11, both of which communicate with the heating chamber 21. When the pressure inside the heating chamber 21 exceeds the pressure of the preheater safety valve 10, the safety valve 10 opens to release pressure. Simultaneously, the preheater explosion-proof port 11 will also automatically open due to excessive pressure, ensuring equipment safety.

[0023] Furthermore, a spark monitoring device, a pressure monitoring device, and a temperature monitoring device are installed on the pulverized coal preheater 9 to monitor the spark, pressure, and temperature within the heating chamber 21, respectively. Preferably, the spark monitoring device, pressure monitoring device, and temperature monitoring device are a spark detector 12, a pressure sensor 14, and a temperature sensor 15, respectively. The models and installation methods of the aforementioned detectors and sensors should be conventional selections and operations familiar to those skilled in the art, and this application will not elaborate on or limit them further. When the spark detector 12 receives an alarm signal feedback from the host computer, it indicates that pulverized coal has leaked into the heating chamber 21. The system will automatically execute the inert gas release device according to logic. By opening the pneumatic ball valve 5, inert gas or nitrogen is transported to the preheater flue gas pipe 8 under negative or positive system pressure, and then enters the heating chamber 21 to dilute the combustion-supporting gas, thereby extinguishing the fire. When the alarm disappears, the inert gas release device is closed.

[0024] In addition, a dust monitoring device and a gas monitoring device are installed on the preheater flue gas pipe 18. The dust monitoring device is used to monitor the dust concentration at the preheater flue gas pipe 18, and the gas monitoring device is used to monitor the carbon monoxide concentration and oxygen content at the preheater flue gas pipe 18. Preferably, the dust monitoring device is a dust detector 17, and the gas monitoring device includes a carbon monoxide detector 19 and an oxygen content detector 20. When the dust monitoring device or the gas monitoring device detects that the corresponding medium concentration at the preheater flue gas pipe 18 exceeds the standard and sends an alarm feedback to the host computer, the system will also automatically execute the inert gas release device to dilute the medium and extinguish any possible sparks, until the alarm signal disappears and the inert gas release device is shut down.

[0025] It should be noted that the aforementioned host computer and system are conventional master control devices familiar to those skilled in the art, which can be obtained through customized purchase. They are also conventional master controllers familiar to those skilled in the art, used to achieve the regulation and coordination of various components. Their functions can be customized by programming the microcontroller, and this application will not elaborate on the limitations.

[0026] It should be noted that the above embodiments are only specific and clear descriptions of the technical solutions and features of this application. Solutions or features that are prior art or common knowledge to those skilled in the art will not be described in detail in the above embodiments.

[0027] Furthermore, the technical solutions of this application are not limited to the above embodiments. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A pulverized coal preheating safety device, comprising a pulverized coal preheater (9), wherein a heating chamber (21) is provided inside the pulverized coal preheater (9), and a preheater inlet flue gas pipe (8) and a preheater outlet flue gas pipe (18) communicating with the heating chamber (21) are respectively provided on both sides of the pulverized coal preheater (9), wherein a plurality of preheating branch pipes (13) are provided inside the heating chamber (21), and a coal inlet pipe (16) and a coal outlet pipe (23) communicating with the preheating branch pipes (13) are provided on the pulverized coal preheater (9), characterized in that, An inert gas release device is provided on the flue gas inlet pipe (8) of the preheater for releasing inert gas or nitrogen into the flue gas inlet pipe (8). A pressure reducing component is provided on the pulverized coal preheater (9) for reducing the internal pressure of the heating chamber (21). A spark monitoring device, a pressure monitoring device and a temperature monitoring device are provided on the pulverized coal preheater (9) for monitoring the spark, pressure and temperature in the heating chamber (21) respectively. A dust monitoring device and a gas monitoring device are provided on the flue gas outlet pipe (18) of the preheater. The dust monitoring device is used to monitor the dust concentration at the flue gas outlet pipe (18) of the preheater, and the gas monitoring device is used to monitor the carbon monoxide concentration and oxygen content at the flue gas outlet pipe (18) of the preheater.

2. The pulverized coal preheating safety protection device according to claim 1, characterized in that, The inert gas release device includes an inert gas inlet main pipe (1), and the outlet end of the inert gas inlet main pipe (1) is sequentially connected to a metal connecting hose (2), a one-way valve (3), a manual ball valve (4), a pneumatic ball valve (5), and an inert gas outlet main pipe (6). The inert gas outlet main pipe (6) is provided with multiple outlet branch pipes (7) that are connected to the preheater flue gas inlet pipe (8).

3. The pulverized coal preheating safety protection device according to claim 1, characterized in that, The pressure reduction assembly includes a preheater safety valve (10) and a preheater explosion-proof hole (11) installed on the pulverized coal preheater (9). Both the preheater safety valve (10) and the preheater explosion-proof hole (11) are connected to the heating chamber (21).

4. The pulverized coal preheating safety protection device according to claim 1, characterized in that, The spark monitoring device, pressure monitoring device, and temperature monitoring device are a spark detector (12), a pressure sensor (14), and a temperature sensor (15), respectively.

5. The pulverized coal preheating safety protection device according to claim 1, characterized in that, The dust monitoring device is a dust detector (17).

6. The pulverized coal preheating safety protection device according to claim 1, characterized in that, The gas monitoring device includes a carbon monoxide detector (19) and an oxygen content detector (20).

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