A working method of energy-saving phased automatic oil gun

Abstract

The invention discloses an energy-saving, phased automatic oil-dropping gun working method in the technical field of boiler automatic oil-dropping guns, comprising the following working steps: determining whether ignition conditions are met; an operating personnel creates start-up conditions according to regulations, starts corresponding equipment, and performs on-site inspections; after the conditions are met, an SGC control button for starting automatic ignition is activated; sequential control of the phased automatic oil-dropping gun is performed; the method is divided into three stages, namely, an initial ignition stage, a high bypass opening stage, and a coal feeder operation stage; and the temperature rise rate of the boiler metal wall is determined. The invention is advantageous in reducing the workload of operating personnel in manual operations and the startup oil consumption during the startup stage.

Description

Technical Field

[0001] The invention relates to the technical field of automatic oil-feeding guns for boilers, in particular to a working method of an energy-saving and staged automatic oil-feeding gun. Background Art

[0002] At present, coal-fired power units equipped with fuel-assisted combustion need to use oil guns to assist combustion during the startup phase. The operating personnel need to manually put in and withdraw the oil guns according to the furnace flue gas temperature. The startup time is relatively long. Due to the untimely insertion and withdrawal of the oil guns, the wall temperature rise rate often exceeds the limit, causing damage to the boiler heating surface and posing a safety hazard to the equipment. At the same time, since the insertion and withdrawal of the oil guns at each stage require manual operation by the operating personnel, they cannot be handled in time, resulting in high oil consumption.

[0003] Traditional plug-in systems often utilize a single PLC configuration, which can lead to controller failures. During the startup phase of traditional coal-fired power units, operators manually activate and deactivate oil nozzles. Even the best control logic only allows for the sequential activation of multiple nozzles within a given oil layer, lacking features such as automatic deactivation, fire extinguishing and reactivation, or phased automatic activation. These systems also lack the ability to determine the rate of temperature rise of the boiler metal wall, wait time, or fault conditions, making them incapable of automatically activating and deactivating oil nozzles. This places a heavy workload on operators during startup, increasing fuel consumption.

[0004] Based on this, the present invention designs a working method of an energy-saving phased automatic oil gun to solve the above problems. Summary of the Invention

[0005] The purpose of the invention is to provide an energy-saving and phased automatic oil-feeding gun working method to solve the above technical problems.

[0006] To achieve the above-mentioned purpose, the invention provides the following technical solution: a working method of an energy-saving phased automatic oil gun, comprising the following working steps:

[0007] S1: Determine whether the ignition conditions are met;

[0008] The operating personnel shall create the starting conditions according to the regulations, start the corresponding equipment, and conduct on-site inspections; when the conditions are met, the SGC control button for automatic ignition shall be activated;

[0009] S2: Carry out phased automatic oil gun sequence control;

[0010] It is divided into three stages: initial ignition stage, high bypass opening stage and coal feeder operation stage;

[0011] S3: Determine the temperature rise rate of the boiler metal wall;

[0012] When the number of oil guns in operation is greater than 3 and the main steam temperature exceeds 300°C, the temperature rise rate of the metal wall of the metal boiler is judged; if the maximum temperature rise within 5 minutes is greater than 1.5°C, further oil gun operation is not allowed.

[0013] Preferably, the specific steps of the initial ignition stage in step S2 are:

[0014] S2.1: Automatically start the fuel guns one by one in the order of B2-B3-B4-B5-B1-B6, until the first fuel gun is put into normal operation. After it is put into normal operation, start the second fuel gun in the order of B2-B3-B4-B5-B1-B6, and delay for 10 minutes after the two fuel guns are put into operation. After lighting two fuel guns, extinguish one within 10 minutes, and wait for another 10 minutes.

[0015] S2.2: After a 10-minute delay, the third fuel gun is put into operation in the order of B2-B3-B4-B5-B1-B6. After the three fuel guns are normal, the delay is 25 minutes; after 3 guns are lit, one gun goes out within 25 minutes, and then wait for another 25 minutes. If two guns go out, the waiting time is 10 minutes longer.

[0016] S2.3: Automatically activate high bypass control SGC to perform high bypass pipe heating.

[0017] Preferably, the specific steps of the high bypass opening stage in step S2 are:

[0018] S2.4: After the third oil gun is put into operation normally, add the automatic judgment condition of the boiler metal wall temperature. If the wall temperature measuring point rise rate does not exceed 1.5℃ / min every 5 minutes, the fourth to ninth oil guns will be put into operation in the order of B2-B3-B4-B5-B1-B6-C2-C3-C4-C5-C1-C6-D2-D3-D4-D5-D1-D6. If there is a fault, the oil gun will be skipped.

[0019] Preferably, the specific steps of the coal feeder operation stage in step S2 are:

[0020] S2.5: After a 25-minute delay, confirm that one micro-oil ignition cooling fan is running and the pressure is normal, and then start the A-layer oil gun SGC, and continue to start the A-layer oil guns for 6 times;

[0021] S2.6: Start the primary fan after a delay of 10 minutes to confirm that the primary fan is operating normally and the primary air pressure is normal;

[0022] S2.7: Start coal mill A to preheat SGC;

[0023] S2.8: Automatically determine that the high side opening is greater than 50%, and that the wall temperature measuring point rising rate does not exceed 1.5°C / min every 5 minutes, and start coal feeder A;

[0024] S2.9: Automatic oil gun withdrawal method: In this embodiment, after the coal feeder A runs for 30 seconds, all oil guns in the A layer are automatically withdrawn. After 30 seconds, the oil guns in the B and D layers are withdrawn, leaving only one.

[0025] Preferably, the specific steps of the high bypass opening stage in step S3 are:

[0026] Temperature detection is performed on 200 points on different pipes arranged around the boiler. The current temperature is compared with the value of the previous minute. This comparison is repeated 5 times, i.e., every 5 minutes. The obtained values ​​are compared. If the deviation is less than 1.5°C, it is judged that the boiler metal wall temperature rise rate is OK, and a 5-second pulse is issued every 5 minutes; otherwise, it is not OK and no pulse is issued.

[0027] A device for realizing an energy-saving phased automatic oil-feeding gun operation method, comprising:

[0028] SYS1 is the original DCS system, responsible for collecting and controlling the status and execution of local equipment;

[0029] SYS2 and SYS3 are redundant external controllers of the present invention, which perform the operation of the automatic oil gun control logic in stages, and the backplane redundant communication is between SYS2 and SYS3;

[0030] SYS1 is connected to SYS2 and SYS3 via Ethernet or RS485 communication for the interaction of related signals.

[0031] Compared with the prior art, the invention has the following beneficial effects:

[0032] This invention uses an energy-saving, phased, automatic oil-feeding method. Before-and-after comparisons show that a single startup can save 1.5 hours of startup time and 0.8 hours of oil-feeding time. This directly saves 3.8 tons of fuel per startup, and indirectly reduces the risk of furnace tube leakage caused by significant stress changes in metal pipes, thus reducing overall startup time.

[0033] The present invention adopts an energy-saving phased automatic oil gun operation method, which can automatically put in a certain number of oil guns according to the quantity requirement of oil guns put in operation at different stages by using a time delay method, thereby reducing a large amount of manual operation workload.

[0034] The present invention adopts an energy-saving phased automatic oil gun operation method, which can realize the function of automatically operating other oil guns when extinguishing a fire, reduce the workload of operators in real-time monitoring, solve the problem of operators not discovering the oil gun failure in time after extinguishing the fire, and improve the efficiency of operating the oil gun.

[0035] The present invention adopts an energy-saving phased automatic oil gun working method, which can automatically withdraw the oil gun of the corresponding layer after the coal feeder runs stably, thereby improving the operating efficiency and saving fuel.

[0036] The present invention adopts an energy-saving phased automatic oil gun working method, which can automatically adjust the progress of the oil gun according to the metal wall temperature of the boiler, thereby ensuring that the boiler heating surface does not experience drastic temperature changes and eliminating the hidden danger of furnace tube leakage caused by large changes in metal pipeline stress.

[0037] The present invention adopts an energy-saving phased automatic oil gun working method, realizes the functions of automatic and disturbance-free switching of a single controller failure and automatic removal of a dual controller failure of the external plug-in system, and improves the reliability and safety of the external plug-in system. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions of the embodiments of the invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0039] Figure 1 Schematic diagram of the control device of the present invention;

[0040] Figure 2 This is a hardware schematic diagram of the device of the present invention;

[0041] Figure 3 This is a functional flow chart of an energy-saving, staged, automatic oil-feeding gun device according to an embodiment of the present invention;

[0042] Figure 4 This is a schematic diagram of the initial ignition sequence control in an embodiment of the present invention;

[0043] Figure 5 Schematic diagram of sequential control during the high bypass opening phase in an embodiment of the present invention;

[0044] Figure 6 Schematic diagram of sequential control of the coal feeder during operation in an embodiment of the present invention;

[0045] Figure 7 Schematic diagram of determining the temperature rise rate of a metal wall according to an embodiment of the present invention. DETAILED DESCRIPTION

[0046] The following will clearly and completely describe the technical solutions in the embodiments of the invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0047] See also Figure 1-7 , the invention provides a technical solution: Example:

[0048] Figure 1 In one embodiment, a device for implementing an energy-saving phased automatic oil gun operation method includes:

[0049] SYS1 is the original DCS system, responsible for collecting and controlling the status and execution of local equipment;

[0050] SYS2 and SYS3 are redundant external controllers of the present invention, which perform the operation of the automatic oil gun control logic in stages, and the backplane redundant communication is between SYS2 and SYS3;

[0051] SYS1 is connected to SYS2 and SYS3 via Ethernet or RS485 communication for the interaction of related signals.

[0052] For example: oil gun fire detection signal, oil gun operation instruction, oil gun fault signal, boiler metal wall temperature, high bypass status, coal feeder instruction, etc. can be adjusted according to the signal quantity of different units.

[0053] Redundancy judgment and life signature detection are performed between SYS2 and SYS3, enabling automatic and disturbance-free switching in the event of a single controller failure and active removal in the event of a dual controller failure.

[0054] The present invention can be configured according to different boiler oil gun arrangements, and as long as the communication point list is defined, the energy-saving staged automatic oil gun drop function can be realized.

[0055] Figure 3 The present invention is a functional flow chart of an energy-saving staged automatic oil-dropping gun device in an embodiment.

[0056] The method includes:

[0057] S1: Determine whether the ignition conditions are met.

[0058] The operating personnel shall create the starting conditions according to the requirements of the regulations, start the corresponding equipment, and conduct on-site inspections; after the conditions are met, the SGC control button for automatic ignition is activated.

[0059] S2: Carry out phased automatic oil gun sequence control;

[0060] The first stage is the initial ignition stage, when the boiler is in the cold furnace stage, requiring a longer interval between oil gun commissioning.

[0061] The specific steps are: Figure 4 middle

[0062] S2.1: Automatically start the fuel guns SGC one by one in the order B2-B3-B4-B5-B1-B6 until the first fuel gun is put into operation normally. After it is put into operation normally, start the second fuel gun in the order B2-B3-B4-B5-B1-B6 again, and delay 10 minutes after the two fuel guns are put into operation. After lighting two fuel guns, extinguish one within 10 minutes, and wait another 10 minutes. Among them, B2 means the fuel gun number, which represents the second fuel gun on the second floor. The meanings of other alphanumeric combination numbers are similar.

[0063] S2.2: After a 10-minute delay, the third fuel gun is put into operation in the order of B2-B3-B4-B5-B1-B6. After the three fuel guns are normal, the delay is 25 minutes; after 3 guns are lit, one gun goes out within 25 minutes, and then wait for another 25 minutes. If two guns go out, the waiting time is 10 minutes longer.

[0064] S2.3: Automatically activate high bypass control SGC to perform high bypass pipe heating.

[0065] The second stage is the high bypass opening stage, at which time a larger number of oil guns are required and the speed of oil gun casting is faster.

[0066] The specific steps are: Figure 5 middle

[0067] S2.4: After the third oil gun is put into operation normally, add the automatic judgment condition of the boiler metal wall temperature. If the wall temperature measuring point rise rate does not exceed 1.5℃ / min every 5 minutes, the fourth to ninth oil guns will be put into operation in the order of B2-B3-B4-B5-B1-B6-C2-C3-C4-C5-C1-C6-D2-D3-D4-D5-D1-D6. If there is a fault, the oil gun will be skipped.

[0068] During the third phase of coal feeder operation, it is necessary to promptly remove excess oil guns to save fuel.

[0069] The specific steps are: Figure 6 middle

[0070] S2.5: After a 25-minute delay, confirm that one micro-oil ignition cooling fan is running and the pressure is normal, and then start the A-layer oil gun SGC, and continue to start the A-layer oil guns for 6 times;

[0071] S2.6: Start the primary fan after a delay of 10 minutes to confirm that the primary fan is operating normally and the primary air pressure is normal;

[0072] S2.7: Start coal mill A to preheat SGC;

[0073] S2.8: Automatically determine that the high side opening is greater than 50%, and that the wall temperature measuring point rising rate does not exceed 1.5°C / min every 5 minutes, and start coal feeder A;

[0074] S2.9: Automatic oil gun withdrawal method: In this embodiment, after the coal feeder A runs for 30 seconds, all oil guns in the A layer are automatically withdrawn. After 30 seconds, the oil guns in the B and D layers are withdrawn, leaving only one.

[0075] S3: Boiler Metal Wall Temperature Rise Rate Determination Method: In this embodiment, when more than three oil guns are in operation and the main steam temperature exceeds 300°C, the boiler metal wall temperature rise rate is determined. If the maximum temperature rise within 5 minutes exceeds 1.5°C, further oil gun operation is prohibited.

[0076] For example: Figure 6 In this embodiment, the method for determining the temperature rise rate of the boiler metal wall is as follows: temperature detection is performed on 200 points on different pipes arranged around the boiler, and the current temperature is compared with the value of the previous minute. This comparison is repeated 5 times, i.e., 5 minutes. The obtained values ​​are compared. If the deviation is less than 1.5°C, the boiler metal wall temperature rise rate is determined to be OK, and a 5-second pulse is emitted every 5 minutes; otherwise, it is not OK, and no pulse is emitted.

[0077] Working principle example:

[0078] In this embodiment, the sequential control of the oil guns during the startup phase of a traditional coal-fired power unit is improved and integrated into a redundant controller. An external controller is used to achieve safety, energy saving, reduced manual operations, and shortened startup time.

[0079] Improvement point 1 uses an external redundant controller, which can automatically switch over to the fault of a single controller without disturbance and automatically cut off the fault of two controllers, thereby increasing the reliability of the external system and meeting the safety requirements of the FSSS redundant configuration.

[0080] Improvement point 2: Added the function of repeated trial casting;

[0081] Improvement point 3 is the use of time control function;

[0082] Improvement point 4 adopts the automatic judgment function of oil gun counting;

[0083] Improvement point 5 divides the oil injection process into three stages, for example: the initial ignition stage, the high bypass opening stage, and the coal feeder operation stage, to control the speed of the oil injection gun; Improvement point 6 adds intelligent judgment of the boiler metal wall temperature rise rate to ensure that the boiler heating surface does not experience drastic temperature changes, eliminating the hidden danger of furnace tube leakage caused by large changes in metal pipeline stress.

[0084] In this embodiment, a repeated trial operation function is added. For example, when the first oil gun is put into operation, it is automatically determined whether the operation of the oil gun is normal. If it is not normal, it is skipped and the next one is selected. When the second oil gun is put into operation, the trial operation of the first one is repeated. The advantage is that it can avoid the failure of the first operation of the oil gun due to blocked oil circuit.

[0085] This embodiment utilizes a timer control function. For example, two oil guns are lit, followed by a 10-minute delay. After lighting both guns, one is extinguished within 10 minutes, followed by another 10-minute delay. This solves the problem of boiler wall temperature fluctuations being highly variable, which can lead to sudden temperature increases due to continuous use of oil guns, and slow startup times.

[0086] This embodiment utilizes an automatic fuel gun counting function. For example, if a fuel gun ignites and then extinguishes the fire for various reasons, the number of fuel guns automatically decreases by one. If the number of operational fuel guns does not meet the required number, this embodiment automatically determines the actual number of fuel guns and automatically deploys the remaining fuel guns according to the requirements of each stage. This solves the problem of operators not being able to promptly detect a fuel gun failure after extinguishing the fire.

[0087] In this embodiment, after the coal feeder has been running for 30 seconds, it automatically withdraws the oil gun from the corresponding layer, leaving only one. This solves the problem of the traditional method requiring manual operation by operators, which is time-consuming, improves operating efficiency, and saves fuel.

[0088] This embodiment incorporates an intelligent determination of the rate of temperature rise of the boiler's metal wall and automatically adjusts the oil gun's firing rate based on the wall temperature. This solution addresses the issue of numerous temperature measurement points on the boiler's metal wall, making it difficult for operators to promptly determine the rate of temperature rise. It also improves the efficiency of the oil gun during startup and ignition, preventing excessive temperature rise on the boiler's metal wall caused by excessive firing. This prevents drastic temperature fluctuations on the boiler's heating surfaces and eliminates the potential for leakage from furnace tubes due to significant stress changes in the metal pipes.

[0089] In the description of the invention, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inside", "front", "center", "both ends", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the invention.

[0090] In the invention, unless otherwise clearly stipulated and limited, the terms such as "installation", "setting", "connection", "fixation", "screw-on" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated 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; it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the invention according to the specific circumstances.

[0091] While embodiments of the invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and alterations may be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A working method of an energy-saving phased automatic oil gun, characterized in that: Used for fuel injection during the startup phase of coal-fired power plants, including the following steps: S1: Determine whether the ignition conditions are met; The operating personnel shall create the starting conditions according to the regulations, start the corresponding equipment, and conduct on-site inspections; when the conditions are met, the SGC control button for automatic ignition shall be activated; S2: Carry out phased automatic oil gun sequence control; It is divided into three stages: initial ignition stage, high bypass opening stage and coal feeder operation stage; S3: Determine the temperature rise rate of the boiler metal wall; When the number of oil guns in operation exceeds 3 and the main steam temperature exceeds 300℃, the temperature rise rate of the metal wall of the metal boiler will be judged; if the maximum temperature rise within 5 minutes is greater than 1.5℃, no further oil gun operation will be allowed; The specific steps of the initial ignition stage in step S2 are: S2.1: Automatically ignite the fuel guns one by one in the order B2-B3-B4-B5-B1-B6. SGC will automatically ignite the fuel guns one by one until the first one is operating normally. After the first one is operating normally, ignite the second fuel gun in the order B2-B3-B4-B5-B1-B6. There will be a 10-minute delay between the two fuel guns. After igniting the two guns, extinguish one within 10 minutes, and wait another 10 minutes. B2 is the fuel gun number, representing the second fuel gun on the second floor. Other alphanumeric combination numbers have similar meanings. S2.2: After a 10-minute delay, the third fuel gun is put into operation in the order of B2-B3-B4-B5-B1-B6. After the three fuel guns are normal, the delay is 25 minutes; after 3 guns are lit, one gun goes out within 25 minutes, and then wait for another 25 minutes. If two guns go out, the waiting time is 10 minutes longer. S2.3: Automatically activate high bypass control SGC to perform high bypass pipe heating.

2. The operating method of the energy-saving phased automatic oil gun according to claim 1 is characterized in that: The specific steps of the high bypass opening stage in step S2 are: S2.4: After the third oil gun is put into operation normally, add the automatic judgment condition of the boiler metal wall temperature. If the wall temperature measuring point rise rate does not exceed 1.5℃ / min every 5 minutes, the fourth to ninth oil guns will be put into operation in the order of B2-B3-B4-B5-B1-B6-C2-C3-C4-C5-C1-C6-D2-D3-D4-D5-D1-D6. If there is a fault, the oil gun will be skipped.

3. The operating method of the energy-saving phased automatic oil gun according to claim 1 is characterized in that: The specific steps of the coal feeder operation stage in step S2 are: S2.5: After a 25-minute delay, confirm that one micro-oil ignition cooling fan is running and the pressure is normal, and then add the micro-oil gun SGC to layer A. Continuously add 6 micro-oil guns to layer A. S2.6: Start the primary fan after a delay of 10 minutes to confirm that the primary fan is operating normally and the primary air pressure is normal; S2.7: Start coal mill A to preheat SGC; S2.8: Automatically determine that the high side opening is greater than 50%, and that the wall temperature measuring point rising rate does not exceed 1.5°C / min every 5 minutes, and start coal feeder A; S2.9: Automatic oil gun withdrawal method: After the coal feeder A runs for 30 seconds, all oil guns on the A layer will be automatically withdrawn. 30 seconds later, the oil guns on the B and D layers will be withdrawn, leaving only one.

4. The operating method of the energy-saving phased automatic oil gun according to claim 1 is characterized in that: The specific steps for determining the boiler metal wall temperature rise rate in step S3 are: Temperature detection is performed on 200 points on different pipes arranged around the boiler. The current temperature is compared with the value of the previous minute. This comparison is repeated 5 times, i.e., every 5 minutes. The obtained values ​​are compared. If the deviation is less than 1.5°C, it is judged that the boiler metal wall temperature rise rate is OK, and a 5-second pulse is issued every 5 minutes; otherwise, it is not OK and no pulse is issued.

5. A device for implementing the operating method of the energy-saving phased automatic oil gun according to claims 1-4, characterized in that: include: SYS1; It is the original DCS system, responsible for collecting and controlling the status and execution of local equipment; SYS2, SYS3; Both are redundant external controllers, performing phased automatic oil gun control logic operations, and backplane redundant communication between SYS2 and SYS3; SYS1 is connected to SYS2 and SYS3 via Ethernet or RS485 communication for the interaction of related signals.

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