Smoke channeling prevention protection device for coal feeding system of circulating fluidized bed boiler
By setting up temperature and air pressure detection modules in the coal feeding system of the circulating fluidized bed boiler, and using the DCS system to control the channels between the coal feeder and the coal feeder, the smoke risk is solved, the system safety is improved, and the explosion accident is prevented .
Patent Information
- Application Number
- CN202323254363.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-11-30
- Publication Date
- 2024-12-10
- Estimated Expiration
- 2033-11-30
AI Technical Summary
The coal feeding system of the circulating fluidized bed boiler has a risk of smoke rushing in high temperature and high pressure environments, resulting in frequent combustion and explosion accidents. The existing system is low in safety and is difficult to effectively prevent.
A smoke protection device is designed. By setting up a temperature detection module and a wind pressure detection module in the coal seeder and coal feeder, and connecting it to the DCS system, the coal feeder and coal seeder are controlled by using the driving motor and plug-in board. The channel of the device monitors the temperature and wind pressure changes in real time, cut off the coal supply in time, and prevent high-temperature flue gas from entering.
It effectively prevents the high-temperature flue gas in the furnace from entering the coal feeder and coal silo, eliminates the budding state of the explosion accident, and improves the safety of the coal feeding system of the circulating fluidized bed boiler.
Smart Images
Figure CN222143030U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of boiler coal feeding, in particular to a smoke channeling protection device for a circulating fluidized bed boiler coal feeding system. Background Art
[0002] Circulating fluidized bed boilers are usually operated under high temperature and pressure. Although the safety supervision of boiler systems is strict, safety accidents in boiler systems still occur frequently. Among the many boiler accidents, explosion accidents in the coal feeding system account for about one-fifth of the total boiler accidents. In addition to factors such as poor management, improper operation of personnel, and poor maintenance, it is also closely related to the safety of the equipment. The existing coal feeding system has a low level of safety and a high risk during operation, making it difficult to effectively resolve the risks that arise. Utility Model Content
[0003] The utility model aims to provide a smoke-blow-through protection device for a coal feeding system of a circulating fluidized bed boiler, aiming to solve the problems mentioned in the above-mentioned background technology.
[0004] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: the circulating fluidized bed boiler coal feeding system anti-smoke leakage protection device, the coal feeding system is connected to the existing DCS system, including a coal spreader for conveying coal into the furnace, the coal spreader is provided with a temperature detection module for detecting the temperature change in the coal spreader, and also includes a coal lowering control module, the coal lowering control module determines whether to cut off the external coal from entering the coal spreader according to the temperature detection module.
[0005] Preferably, it also includes a coal feeder for conveying fuel coal into the coal spreader, the coal feeding control module is located between the coal feeder and the coal spreader, and a wind pressure detection module is provided at one end of the coal feeder, and the wind pressure detection module is used to detect the change in wind pressure in the coal feeder.
[0006] Preferably, the coal feeding control module comprises a driving motor and a plug plate arranged at the output end of the driving motor, wherein the plug plate is located inside the coal spreader and controls the connection or interruption between the coal feeder and the coal spreader through its rotation.
[0007] Preferably, the temperature detection module is a chip resistance thermometer.
[0008] Preferably, the wind pressure detection module is a wind pressure sensor.
[0009] The beneficial effects of the utility model are:
[0010] By setting up a temperature detection module and a wind pressure detection module and connecting the DCS system to the boiler coal feeding system, the temperature, temperature change, wind pressure and wind pressure change can be effectively monitored in real time, and the channels of the coal feeder and the coal spreader can be closed in time through the drive motor and the plug plate. This system can prevent the high-temperature flue gas of about 5Kpa and 850℃ in the furnace from entering the coal feeder and the coal bunker through the coal spreader, eliminating the explosion accident in the bud and improving the safety of the circulating fluidized bed boiler coal feeding system equipment. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] Figure 1 It is a structural schematic diagram of a specific embodiment of the utility model.
[0012] In the figure: 1. coal spreader; 2. boiler; 3. temperature detection module; 4. wind pressure detection module; 5. coal bunker; 6. coal feeder; 7. coal blowing fan; 8. coal spreading fan; 9. coal falling sealing fan; 10. coal feeding sealing fan; 11. driving motor; 12. plug board. DETAILED DESCRIPTION
[0013] The specific implementation of the utility model is further described below in conjunction with the accompanying drawings.
[0014] like Figure 1 As shown, a smoke leakage protection device for a circulating fluidized bed boiler coal feeding system includes a coal spreader 1 for conveying coal into a furnace, the coal spreader 1 is provided with a temperature detection module 3 for detecting the temperature change in the coal spreader 1, and also includes a coal lowering control module. The coal lowering control module determines whether to cut off the external coal from entering the coal spreader 1 according to the temperature detection module 3.
[0015] The existing circulating fluidized bed boiler 2 system mainly includes a coal bunker 5, a coal feeder 6, a coal spreader 1 and a boiler 2, wherein the coal bunker 5 is used to store coal, the coal feeder 6 is located below the coal bunker 5, and is used to transport the coal in the coal bunker 5 and transport it to the coal spreader 1. The coal spreader 1 is a pipeline for coal to pass through, and the coal spreader 1 includes a coal feeding and blowing fan 7 and a coal spreading fan 8. The coal feeding and blowing fan 7 and the coal spreading fan 8 can both output wind power. The coal feeding and blowing fan 7 is tilted on the coal spreader 1, and the air outlet of the coal feeding and blowing fan 7 is downwardly arranged to accelerate the efficiency of downward transportation of the coal in the coal feeder 6. The wind blown by the coal spreading fan 8 is used to transport the coal blown by the coal feeding and blowing fan 7 to the furnace of the boiler 2 for combustion. The wind blown by the coal spreading fan 8 makes the coal entering the furnace more evenly spread, prevents coal accumulation, is conducive to the complete combustion of the fuel, and also plays a certain role in preventing the backflow of smoke in the furnace.
[0016] A coal-dropping sealing fan 9 is also provided between the coal spreader 1 and the coal feeder 6 . The wind blown by the sealing fan can prevent the high-temperature flue gas in the furnace from flowing back and burning the coal feeder 6 .
[0017] The coal feeder 6 is also provided with a coal feeding sealing fan 10 for providing sealing air for the coal feeder 6 .
[0018] The coal feeding control module is located between the coal feeder 6 and the coal spreader 1 . A wind pressure detection module 4 is provided at one end of the coal feeder 6 . The wind pressure detection module 4 is used to detect the change in wind pressure in the coal feeder 6 .
[0019] Furthermore, the coal feeding control module includes a driving motor 11 and a plug plate 12 arranged at the output end of the driving motor 11. The plug plate 12 is located inside the coal spreader 1 and controls the connection or interruption between the coal feeder 6 and the coal spreader 1 through its rotation.
[0020] Furthermore, the temperature detection module 3 is a chip resistance thermometer, specifically an aluminum-mounted thermal resistor, with a temperature measurement range of 0-500°C. The temperature detection module 3 is installed on the upper side of the coal spreader 1 so that it is not affected by the operating temperature of the coal feeding fan 7 and the coal spreading fan 8.
[0021] Furthermore, the wind pressure detection module 4 is a wind pressure sensor, which is installed at the upper part of one end of the coal feeder 6, and the pressure measurement range is 0-10Kpa.
[0022] The coal feeding system is connected to the existing DCS system to monitor the temperature in the coal spreader 1 and the wind pressure in the coal feeder 6 in real time. The coal feeding system can prevent the high-temperature flue gas of about 5KPa and 850°C in the furnace generated in the circulating fluidized bed from entering the coal feeder 6 and the coal bin 5 through the coal spreader 1.
[0023] When smoke backflows in the furnace or coal blockage occurs in the coal spreader 1, if the temperature change detected by the temperature detection module 3 is about 1°C / s, the DCS system connected thereto will issue an alarm, which includes flashing lights and horns to remind the operating personnel to check and pay attention to the operation; if the temperature data detected by the temperature detection module 3 is ≥300°C, the output end of the drive motor 11 is controlled by the DCS system to work, and the output end of the drive motor 11 drives the plug plate 12 to rotate, so that the plug plate 12 can separate the coal feeder 6 and the coal spreader 1, and at the same time the coal feeder 6 stops running to ensure the safety of the coal feeder 6 and the coal bin 5, which is beneficial to ensure the safety of the boiler 2 system.
[0024] When hot flue gas in the furnace flows back or coal blockage and combustion occurs in the coal spreader 1, if the wind pressure suddenly rises or drops to a change of about 20Pa / s, the DCS system connected to it will issue an alarm, which includes flashing lights and horns to remind the operating personnel to check and pay attention to the operation; if the wind pressure data detected by the wind pressure detection module 4 deviates from the normal value by ±1.5Kpa, the DCS system will control the drive motor 11 to work, and the coal feeder 6 and the coal spreader 1 will be separated by the plug plate 12, and the coal feeder 6 will stop running at the same time to ensure the safety of the boiler 2 system.
[0025] When the temperature and wind pressure are normal, the operator controls the drive motor 11 to reset the plug plate 12 so that the coal feeder 6 can operate normally.
[0026] By setting up the temperature detection module 3 and the wind pressure detection module 4 and connecting the DCS system to the coal feeding system of the boiler 2, the temperature, temperature change, wind pressure and wind pressure change can be effectively monitored in real time, and the passage between the coal feeder 6 and the coal spreader 1 can be closed in time by driving the motor 11 and the plug plate 12. This system can prevent the high-temperature flue gas of about 5Kpa and 850°C in the furnace from entering the coal feeder 6 and the coal bin 5 through the coal spreader 1, eliminate the explosion accident in the bud, and improve the safety of the coal feeding system equipment of the circulating fluidized bed boiler 2.
[0027] In the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0028] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.
[0029] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.
Claims
1. A circulating fluidized bed boiler coal feeding system anti-smoke protection device, the coal feeding system is connected to the existing DCS system, Its characteristics are: The invention comprises a coal spreader (1) for conveying coal into a furnace, the coal spreader (1) being provided with a temperature detection module (3) for detecting the temperature change in the coal spreader (1), and a coal lowering control module, the coal lowering control module determining whether to cut off the external coal from entering the coal spreader (1) according to the temperature detection module (3).
2. The circulating fluidized bed boiler coal feeding system anti-smoke protection device according to claim 1, Its characteristics are: It also comprises a coal feeder (6) for conveying burning coal into the coal spreader (1), the coal feeding control module being located between the coal feeder (6) and the coal spreader (1), and a wind pressure detection module (4) being provided at one end of the coal feeder (6), the wind pressure detection module (4) being used to detect the wind pressure change in the coal feeder (6).
3. The circulating fluidized bed boiler coal feeding system anti-smoke protection device according to claim 2, Its characteristics are: The coal feeding control module comprises a driving motor (11) and a plug plate (12) arranged at the output end of the driving motor (11); the plug plate (12) is located inside the coal spreader (1) and controls the connection or interruption between the coal feeder (6) and the coal spreader (1) through its rotation.
4. The circulating fluidized bed boiler coal feeding system anti-smoke protection device according to claim 1, Its characteristics are: The temperature detection module (3) is a chip-type resistance thermometer.
5. The circulating fluidized bed boiler coal feeding system anti-smoke protection device according to claim 2, Its characteristics are: The wind pressure detection module (4) is a wind pressure sensor.