Pulverized coal leakage emergency treatment device based on DCS (Distributed Control System) interlocking control

Abstract

The utility model relates to a pulverized coal leakage emergency treatment device based on DCS (Distributed Control System) interlocking control, which belongs to the technical field of heat energy power, and comprises a pulverized coal bunker, a detection device, a spraying execution device, a DCS control system and an auxiliary safety device, the detection device consists of a dust sensor, a temperature sensor and a pressure sensor, and is used for monitoring the pulverized coal leakage condition in real time; the spraying execution device comprises a spraying pipeline and a self-cleaning spraying head and is used for dust falling treatment during leakage; the DCS control system realizes interlocking control of each component through the PLC controller and the LoRa communication module; by means of multi-mode leakage detection and interlocking control, the coal powder leakage monitoring system can quickly respond to coal powder leakage events, reduce dust diffusion, prevent deflagration and explosion and guarantee site safety.

Description

Technical Field

[0001] This utility model belongs to the field of thermal power technology, specifically relating to an emergency response device for pulverized coal leakage based on DCS interlock control. Background Technology

[0002] In the field of thermal power, pulverized coal unloading is a critical step in the operation of coal-fired boilers. When pipeline or valve leaks occur during pulverized coal unloading, manual intervention is typically used to close the unloading valve to protect the pulverized coal silo. However, manual operation is not only slow to respond, but also causes rapid dispersion of pulverized coal at the site when a leak occurs, forming a large amount of dust that severely pollutes the environment and affects the health of operators. More seriously, when pulverized coal reaches a certain concentration in the air, it can easily ignite and explode upon encountering an ignition source, causing serious injury to on-site equipment and personnel, posing significant economic and safety hazards. Therefore, rapid and automated leak detection and emergency response are needed during pulverized coal unloading to reduce dust dispersion and prevent deflagration and explosion accidents.

[0003] A prior art method for early warning and detection of leaks in pulverized coal transmission pipelines, disclosed in CN105067190A, involves installing temperature sensors on vulnerable sections of the pipeline to monitor pipe wall temperature changes in real time. The data is then transmitted to an analysis and control host for processing, enabling early warning of potential pipeline leaks and proactive protection against damage to the pulverized coal transmission pipeline, preventing the accident from escalating. However, relying solely on temperature changes for leak warning lacks effective monitoring and response measures for dust diffusion and potential deflagration risks caused by pulverized coal leaks, and also lacks real-time dust suppression and fire / explosion prevention capabilities at the leak site. Utility Model Content

[0004] The technical problem solved by this utility model is to overcome the defects in the existing technology and provide an emergency treatment device for pulverized coal leakage based on DCS interlock control.

[0005] The technical solution adopted in this utility model is as follows:

[0006] The coal dust leakage emergency handling device based on DCS interlock control described in this utility model includes a coal dust silo, a detection device, a spray execution device, a DCS control system, and an auxiliary safety device. The detection device includes a dust sensor, a temperature sensor, and a pressure sensor. The spray execution device includes a spray pipe and a self-cleaning spray head. The DCS control system includes a PLC controller and a LoRa communication module. The auxiliary safety device is an audible and visual alarm, which is electrically connected to the PLC controller.

[0007] A dust collector is connected to the top of the pulverized coal silo via a pipe, and an impeller feeder is connected to the bottom of the pulverized coal silo via a pipe. A hydraulic valve is also connected between the pulverized coal silo and the dust collector.

[0008] The pulverized coal silo is connected to a pulverized coal tanker truck via a pulverized coal unloading pipeline. The pulverized coal unloading pipeline is equipped with an electric unloading valve. A pressure sensor is located on the inner wall of the pulverized coal unloading pipeline between the electric unloading valve and the pulverized coal silo. A temperature sensor is located at the connection between the pulverized coal silo and the pulverized coal unloading pipeline. A dust sensor is located at the unloading site of the pulverized coal tanker truck.

[0009] It also includes a fire water pipe network, which is connected to self-cleaning sprinkler heads through sprinkler pipes. The sprinkler pipes are equipped with electric sprinkler valves, which are three-way valves. The electric sprinkler valves are also connected to explosion suppressant storage tanks. The self-cleaning sprinkler heads are located at the unloading site of the pulverized coal tanker.

[0010] Dust sensors, temperature sensors, pressure sensors, powder discharge electric valves, and spray electric valves are all electrically connected to the PLC controller.

[0011] The self-cleaning spray head includes an atomizing device and a spray head body, which are connected together.

[0012] The atomizing device includes an atomizing cover with several atomizing holes.

[0013] The main body of the spray head includes a nozzle, a fastening thread on the outside of the nozzle, a compression channel connected to one end of the nozzle, an installation head connected to the other end of the compression channel, an air inlet on the compression channel, a spiral guide vane inside the compression channel, a water inlet inside the installation head, and an installation thread on the outside of the installation head.

[0014] This utility model has the following beneficial effects:

[0015] 1. Dust sensors, temperature sensors, and pressure sensors combine to provide triple data detection, which is then integrated and analyzed by the DCS system to more accurately determine leak conditions. For example, when dust concentration exceeds a threshold and local temperature is abnormal, a higher level of response is triggered, effectively improving the accuracy and safety of leak detection.

[0016] 2. The electric spray valve is divided into a primary spray for water mist dust suppression and a secondary spray for explosion suppressant. When the dust concentration reaches the set explosion-proof lower limit threshold, the secondary spray is activated to effectively prevent dust explosion and improve the safety of the system.

[0017] 3. The self-cleaning spray head is equipped with a spiral guide vane, which uses water flow to rotate and clean the nozzle; the compression pipe in the self-cleaning spray head is equipped with an air inlet to prevent coal dust from accumulating and clogging, ensuring the long-term stable operation of the spraying device and reducing maintenance costs.

[0018] 4. The DCS system is linked to the audible and visual alarm, which instructs operators to evacuate safely based on the dust concentration results, improving the escape efficiency and safety of on-site personnel. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall design of this utility model;

[0020] Figure 2 This is a schematic diagram of a self-cleaning spray head.

[0021] Figure 3 This is an exploded structural diagram of a self-cleaning spray head.

[0022] The components include: 1. Pulverized coal silo; 2. Dust sensor; 3. Temperature sensor; 4. Pressure sensor; 5. Spray pipe; 6. Self-cleaning spray head; 7. Silo top dust collector; 8. Impeller feeder; 9. Hydraulic valve; 10. Pulverized coal unloading pipe; 11. Pulverized coal tanker; 12. Pulverized coal unloading electric valve; 13. Fire water pipe network; 14. Spray electric valve; 15. PLC controller; 16. Audible and visual alarm; 17. Atomizing hood; 18. Atomizing hole; 19. Spray head; 20. Fastening thread; 21. Compression channel; 22. Air inlet; 23. Water inlet; 24. Mounting thread; 25. Spiral guide vane; 26. Explosion suppressant storage tank. Detailed Implementation

[0023] like Figures 1 to 3 As shown, the coal powder leakage emergency handling device based on DCS interlock control of this utility model includes a coal powder silo 1, and also includes a detection device, a spray execution device, a DCS control system, and an auxiliary safety device; the detection device includes a dust sensor 2, a temperature sensor 3, and a pressure sensor 4; the spray execution device includes a spray pipe 5 and a self-cleaning spray head 6; the DCS control system includes a PLC controller 15 and a LoRa communication module; the auxiliary safety device is an audible and visual alarm 16, which is electrically connected to the PLC controller 15.

[0024] A dust collector 7 is connected to the top of the pulverized coal silo 1 via a pipe, and an impeller feeder 8 is connected to the bottom of the pulverized coal silo 1 via a pipe. A hydraulic valve 9 is also connected between the pulverized coal silo 1 and the dust collector 7.

[0025] The pulverized coal silo 1 is connected to the pulverized coal tanker 11 via the unloading pipeline 10. The unloading pipeline 10 is equipped with an unloading electric valve 12. The pressure sensor 4 is located on the inner wall of the unloading pipeline 10 between the unloading electric valve 12 and the pulverized coal silo 1. The temperature sensor 3 is located at the connection between the pulverized coal silo 1 and the unloading pipeline 10. The dust sensor 2 is located at the unloading site of the pulverized coal tanker 11.

[0026] It also includes a fire water pipe network 13, which is connected to a self-cleaning sprinkler head 6 via a sprinkler pipe 5. A sprinkler electric valve 14 is installed on the sprinkler pipe 5. The sprinkler electric valve 14 is a three-way valve. The sprinkler electric valve 14 is also connected to an explosion suppressant storage tank 26. The self-cleaning sprinkler head 6 is located at the unloading site of the pulverized coal tanker 11.

[0027] Dust sensor 2, temperature sensor 3, pressure sensor 4, powder discharge electric valve 12, and spray electric valve 14 are all electrically connected to PLC controller 15.

[0028] The self-cleaning spray head 6 includes an atomizing device and a spray head body, which are connected together.

[0029] The atomizing device includes an atomizing cover 17, which has a plurality of atomizing holes 18.

[0030] The main body of the spray head includes a nozzle 19, a fastening thread 20 on the outside of the nozzle 19, one end of the nozzle 19 is connected to a compression channel 21, the other end of the compression channel 21 is connected to an installation head, an air inlet 22 is provided on the compression channel 21, a spiral guide vane 25 is provided inside the compression channel 21, a water inlet 23 is provided inside the installation head, and an installation thread 24 is provided on the outside of the installation head.

[0031] Specifically, dust sensor 2, temperature sensor 3, and pressure sensor 4 monitor the leakage situation in real time and transmit the data to PLC controller 15. PLC controller 15 analyzes the data to determine the degree of leakage and takes corresponding measures when a coal powder leak occurs. When the dust concentration exceeds the threshold and the local temperature is abnormal, PLC controller 15 triggers a higher-level response, interlocks and closes the coal powder unloading electric valve 12, stops the coal powder conveying, and sends an alarm signal to on-site personnel via the LoRa communication module.

[0032] Specifically, the PLC controller 15 controls the spray electric valve 14 to open and connect to the fire water pipeline network 13, initiating the primary water mist dust suppression spray to treat the dust leak site. When the dust concentration reaches the set explosion-proof lower limit threshold, the PLC controller 15 controls the spray electric valve 14 to open and connect to the explosion suppressant storage tank 26, initiating the secondary explosion suppressant spray, which sprays the explosion suppressant to the leak site through the spray pipe 5 and the self-cleaning spray head 6.

[0033] Specifically, when water flows through the self-cleaning spray head 6, the spiral guide vane 25 causes the water to rotate at high speed. The swirling water flow washes the inner wall of the compression channel 21, which can throw the deposited coal powder particles towards the center of the channel and discharge them with the main water flow, preventing coal powder from accumulating in the nozzle cone section. The self-cleaning spray head 6 is connected to an external air source through the air inlet 22 of the compression channel 21. The airflow direction should be consistent with the water flow direction. The airflow and the swirling water flow work together to flush the coal powder out of the nozzle, realizing the self-cleaning and anti-clogging functions of the nozzle and ensuring the long-term stable operation of the spray system.

Claims

1. A coal powder leakage emergency response device based on DCS interlock control, comprising a coal powder silo (1), characterized in that, It also includes a detection device, a spraying actuator, a DCS control system, and an auxiliary safety device; the detection device includes a dust sensor (2), a temperature sensor (3), and a pressure sensor (4); the spraying actuator includes a spraying pipe (5) and a self-cleaning spray head (6); the DCS control system includes a PLC controller (15) and a LoRa communication module; the auxiliary safety device is an audible and visual alarm (16), which is electrically connected to the PLC controller (15).

2. The coal powder leakage emergency response device based on DCS interlock control according to claim 1, characterized in that, A dust collector (7) is connected to the top of the coal powder silo (1) via a pipe, and an impeller feeder (8) is connected to the bottom of the coal powder silo (1) via a pipe. A hydraulic valve (9) is also connected between the coal powder silo (1) and the dust collector (7).

3. The coal powder leakage emergency response device based on DCS interlock control according to claim 2, characterized in that, The pulverized coal silo (1) is connected to a pulverized coal tanker (11) via a pulverized coal unloading pipe (10). The pulverized coal unloading pipe (10) is equipped with a pulverized coal unloading electric valve (12). The pressure sensor (4) is located on the inner wall of the pulverized coal unloading pipe (10) between the pulverized coal unloading electric valve (12) and the pulverized coal silo (1). The temperature sensor (3) is located at the connection between the pulverized coal silo (1) and the pulverized coal unloading pipe (10). The dust sensor (2) is located at the unloading site of the pulverized coal tanker (11).

4. The coal powder leakage emergency response device based on DCS interlock control according to claim 3, characterized in that, It also includes a fire water pipe network (13), which is connected to a self-cleaning spray head (6) through a spray pipe (5). The spray pipe (5) is equipped with a spray electric valve (14), which is a three-way valve. The spray electric valve (14) is also connected to a detonator storage tank (26). The self-cleaning spray head (6) is located at the unloading site of the coal powder tanker (11).

5. The coal powder leakage emergency response device based on DCS interlock control according to claim 4, characterized in that, The dust sensor (2), temperature sensor (3), pressure sensor (4), powder discharge electric valve (12), and spray electric valve (14) are all electrically connected to the PLC controller (15).

6. The coal powder leakage emergency response device based on DCS interlock control according to claim 5, characterized in that, The self-cleaning spray head (6) includes an atomizing device and a spray head body, wherein the atomizing device and the spray head body are connected.

7. The coal powder leakage emergency response device based on DCS interlock control according to claim 6, characterized in that, The atomizing device includes an atomizing cover (17), which has a plurality of atomizing holes (18).

8. The coal powder leakage emergency response device based on DCS interlock control according to claim 7, characterized in that, The main body of the spray head includes a nozzle (19), the outer side of the nozzle (19) is provided with a fastening thread (20), the nozzle (19) is connected to one end of a compression channel (21), the other end of the compression channel (21) is connected to an installation head, the compression channel (21) is provided with an air inlet (22), the inside of the compression channel (21) is provided with a spiral guide vane (25), the inside of the installation head is provided with a water inlet (23), and the outer side of the installation head is provided with an installation thread (24).

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