CN106765287B - Boiler smoke system of thermal power plant and start-stop control method thereof - Google Patents
Boiler smoke system of thermal power plant and start-stop control method thereof Download PDFInfo
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- CN106765287B CN106765287B CN201710046248.5A CN201710046248A CN106765287B CN 106765287 B CN106765287 B CN 106765287B CN 201710046248 A CN201710046248 A CN 201710046248A CN 106765287 B CN106765287 B CN 106765287B
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- blower
- electric door
- induced draft
- draft fan
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L15/00—Heating of air supplied for combustion
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L2900/00—Special arrangements for supplying or treating air or oxidant for combustion; Injecting inert gas, water or steam into the combustion chamber
- F23L2900/15043—Preheating combustion air by heat recovery means located in the chimney, e.g. for home heating devices
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Regulation And Control Of Combustion (AREA)
- Control Of Positive-Displacement Air Blowers (AREA)
Abstract
The invention provides a boiler flue gas system of a thermal power plant and a start-stop control method thereof, wherein the system comprises the following components: the system comprises a first air preheater, a second air preheater, a first blower, a second blower, a first induced draft fan, a second induced draft fan, a blower outlet main pipe connecting door and a plurality of pipelines; the air blower is connected with the air preheater through a pipeline, an inlet guide vane is arranged at the inlet of the air blower, and an outlet electric door is arranged at the outlet of the air blower; the air preheater is connected with a boiler hearth through two pipelines, one pipeline is provided with an air preheater outlet electric door, and the other pipeline is provided with an air preheater inlet electric door; the induced draft fan is arranged on a pipeline of the air preheater leading to the flue gas tower, two ends of the induced draft fan are respectively provided with an inlet electric door and an outlet electric door, and an induced draft fan inlet guide vane is further arranged at the inlet of the induced draft fan; the outlet main pipe of the first blower and the outlet main pipe of the second blower are communicated through the blower outlet main pipe connecting door.
Description
Technical Field
The invention relates to the technical field of thermal power generation, in particular to a boiler smoke system of a thermal power plant and a start-stop control method thereof.
Background
In the boiler of thermal power plant, the combustion efficiency of boiler can be guaranteed only by guaranteeing enough air inflow, and in the existing boiler, an air inlet pipeline is directly arranged for the boiler, so that outside air is led into a combustion chamber, but because of a large temperature difference between the outside air and the temperature of a hearth, the temperature of the furnace is reduced by leading in the outside air, so that the combustion efficiency is reduced, and if a separate air heating device is added, the running cost is increased. Moreover, in the existing thermal power plant, under the state of full stop of the boiler air and smoke system, automatic start of the boiler air and smoke system cannot be realized, and automatic stop of the boiler air and smoke system cannot be realized under the running state of the boiler air and smoke system, and when the starting program of the boiler air and smoke system runs to a certain step, if the step condition is not satisfied, the running of the starting program cannot be continued. The operation and the stop of the existing boiler air and smoke system are manually interfered, so that the workload and the labor cost are greatly increased, and if the boiler air and smoke system cannot be started or stopped in time, the normal operation of a unit can be influenced.
Disclosure of Invention
In order to solve the technical problems, the embodiment of the invention provides a boiler flue gas system of a thermal power plant and a start-stop control method thereof.
In one aspect, an embodiment of the present invention provides a thermal power plant boiler fume system, where the thermal power plant boiler fume system includes: the system comprises a first air preheater, a second air preheater, a first blower, a second blower, a first induced draft fan, a second induced draft fan, a blower outlet main pipe connecting door and a plurality of pipelines;
the first air blower is connected with the first air preheater through a pipeline, an air blower inlet guide vane is arranged at the inlet of the first air blower, and an air blower outlet electric door is arranged at the outlet of the first air blower; the first air preheater is connected with a boiler hearth through two pipelines, one pipeline is provided with an air preheater outlet electric door, and the other pipeline is provided with an air preheater inlet electric door; the first induced draft fan is arranged on a pipeline of the first air preheater leading to the flue gas tower, two ends of the first induced draft fan are respectively provided with an inlet electric door and an outlet electric door, and an inlet guide vane of the induced draft fan is further arranged at the inlet of the first induced draft fan;
the second air blower is connected with the second air preheater through a pipeline, an air blower inlet guide vane is arranged at the inlet of the second air blower, and an air blower outlet electric door is arranged at the outlet of the second air blower; the second air preheater is connected with the boiler furnace through two pipelines, one pipeline is provided with an air preheater outlet electric door, and the other pipeline is provided with an air preheater inlet electric door; the second induced draft fan is arranged on a pipeline of the second air preheater leading to the flue gas tower, two ends of the second induced draft fan are respectively provided with an inlet electric door and an outlet electric door, and an inlet guide vane of the induced draft fan is further arranged at the inlet of the second induced draft fan;
the outlet main pipe of the first air blower is communicated with the outlet main pipe of the second air blower through the air blower outlet main pipe connecting door.
On the other hand, the embodiment of the invention provides a method for controlling the start and stop of a boiler fume system of a thermal power plant, which comprises the following steps:
judging whether the first air preheater inlet electric door and the outlet electric door, the second air preheater inlet electric door and the outlet electric door are closed, the first induced draft fan inlet electric door and the outlet electric door, the second induced draft fan inlet electric door and the outlet electric door are closed, the first forced draught blower outlet electric door and the second forced draught blower outlet electric door are closed, the forced draught blower outlet main pipe connecting door is closed, the first induced draft fan inlet guide vane and the second induced draft fan inlet guide vane are closed, and the first forced draught blower inlet guide vane and the second forced draught blower inlet guide vane are closed; if not, sending out instructions for closing the first air preheater inlet electric door and the outlet electric door, the second air preheater inlet electric door and the outlet electric door, and instructions for closing the first induced draft fan inlet electric door and the outlet electric door, the second induced draft fan inlet electric door and the outlet electric door, and instructions for closing the first blower outlet electric door and the second blower outlet electric door, and instructions for closing the blower outlet main pipe connecting door, and instructions for closing the first induced draft fan inlet guide vane and the second induced draft fan inlet guide vane, and instructions for closing the first blower inlet guide vane and the second blower inlet guide vane;
if yes, judging whether the first air preheater and the second air preheater are started; if the first air preheater is not started and/or the second air preheater is not started, sending out an instruction for starting the first air preheater and the second air preheater;
if the first air preheater and the second air preheater are started, judging whether the inlet electric door and the outlet electric door of the first air preheater and the inlet electric door and the outlet electric door of the second air preheater are opened; if not, sending out an instruction for opening the inlet electric door and the outlet electric door of the first air preheater and the inlet electric door and the outlet electric door of the second air preheater;
if the inlet electric door and the outlet electric door of the first air preheater and the inlet electric door and the outlet electric door of the second air preheater are all opened, judging whether the outlet electric door of the first induced draft fan is opened, the outlet electric door of the second induced draft fan is opened, and the main pipe connecting door of the outlet of the induced draft fan is opened; if not, sending out an instruction for opening the electric door at the outlet of the first induced draft fan, an instruction for opening the electric door at the outlet of the second induced draft fan and an instruction for opening the main pipe contact door at the outlet of the induced draft fan;
if the first induced draft fan outlet electric door is opened and the second induced draft fan outlet electric door is opened and the main pipe connecting door of the induced draft fan outlet is opened, judging whether the first induced draft fan is started; if the first induced draft fan is not started, sending out an instruction for starting the first induced draft fan;
if the first induced draft fan is started, judging whether an inlet electric door of the first induced draft fan is opened; if the first induced draft fan inlet electric door is not opened, an instruction for opening the first induced draft fan inlet electric door is sent;
if the inlet electric door of the first induced draft fan is opened, judging whether the first forced draught fan is started; if the first air blower is not started, sending an instruction for starting the first air blower;
if the first blower is started, judging whether a first blower outlet electric door is opened and a second blower outlet electric door is closed; if the first blower outlet electric door is not opened and/or the second blower outlet electric door is not closed, sending an instruction for opening the first blower outlet electric door and an instruction for closing the second blower outlet electric door;
if the first blower outlet electric door is opened and the second blower outlet electric door is closed, judging whether the second blower is started; if the second air blower is not started, sending out an instruction for starting the second air blower;
if the second air blower is started, judging whether a second air blower outlet electric door is opened; if the second blower outlet electric door is not opened, sending an instruction for opening the second blower outlet electric door;
if the second blower outlet electric door is opened, judging whether the second induced draft blower outlet electric door is opened; if the second induced draft fan outlet electric door is not opened, sending an instruction for opening the second induced draft fan outlet electric door;
if the second induced draft fan outlet electric door is opened, judging whether the second induced draft fan is started; if the second induced draft fan is not started, sending out an instruction for starting the second induced draft fan;
if the second induced draft fan is started, judging whether an inlet electric door of the second induced draft fan is opened and a main pipe connecting door of an outlet of the air blower is closed; if the second induced draft fan inlet electric door is not opened and/or the blower outlet main pipe connecting door is not closed, sending an instruction for opening the second induced draft fan inlet electric door and an instruction for closing the blower outlet main pipe connecting door;
if the second induced draft fan inlet electric door is opened and the blower outlet main pipe connecting door is closed, judging whether the first induced draft fan inlet guide vane and the second induced draft fan inlet guide vane are both provided with negative pressure automatic gears and the first blower inlet guide vane and the second blower inlet guide vane are both provided with air quantity automatic gears; if not, sending out an instruction of throwing negative pressure automatic gear to the inlet guide vanes of the first induced draft fan and the inlet guide vanes of the second induced draft fan, and an instruction of throwing air quantity automatic gear to the inlet guide vanes of the first air blower and the inlet guide vanes of the second air blower.
The embodiment of the invention has the beneficial effects that: the boiler fume system of the thermal power plant and the start-stop control method thereof provided by the embodiment of the invention can realize the automatic start of the boiler fume system in the state of total stop of the boiler fume system of the thermal power plant; under the running state of a boiler fume system of a thermal power plant, the automatic stop of the boiler fume system is realized; and the jump operation of the program control logic of the boiler smoke system of the thermal power plant can be realized by taking the artificial judgment into consideration, and when the operation condition of one step of the program control logic is met, the jump operation can be manually judged whether the condition can be ignored and operated, and the operation of the program control logic is continued until the starting is completed.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a boiler fume system of a thermal power plant according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a start-up flow of a boiler fume system of a thermal power plant according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a stopping flow of a boiler fume system of a thermal power plant according to an embodiment of the present invention.
Reference numerals and signs
1. First blower inlet guide vane 2. First blower
3. First blower outlet electric door 4. Second blower inlet guide vane
5. Second air blower 6. Second air blower outlet electric door
7. First induced draft fan inlet electrically operated gate 8. First induced draft fan inlet guide vane
9. First induced draft fan 10. First induced draft fan outlet electric door
11. Second induced draft fan inlet electrically operated gate 12. Second induced draft fan inlet guide vane
13. Second induced draft fan 14. Second induced draft fan outlet electric door
15. First air preheater exit electric door 16. First air preheater entrance electric door
17. Second air preheater inlet electric door 18. Second air preheater outlet electric door
19. Blower outlet header tie door 20. First air preheater
21. Second air preheater 22. First muffler
23. Second muffler
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1, the embodiment of the invention provides a boiler flue gas system of a thermal power plant, which mainly comprises a first air preheater 20, a second air preheater 21, a first blower 2, a second blower 5, a first induced draft fan 9, a second induced draft fan 13, a blower outlet main pipe connecting door 19 and a plurality of pipelines.
The first blower 2 is connected to the first air preheater 20 via a duct, a blower inlet guide vane 1 is provided at an inlet of the first blower 2, and a blower outlet electric door 3 is provided at an outlet thereof. The first air preheater 20 is connected to the boiler furnace via two ducts, one of which is provided with an air preheater outlet electrically operated gate 15 and the other with an air preheater inlet electrically operated gate 16. The first induced draft fan 9 is arranged on a pipeline of the first air preheater 20 leading to the flue gas tower, an inlet electric door 7 and an outlet electric door 10 are respectively arranged at two ends of the first induced draft fan 9, and an induced draft fan inlet guide vane 8 is further arranged at the inlet of the first induced draft fan 9.
Similarly, the second blower 5 is connected to the second air preheater 21 by a duct, and a blower inlet guide vane 4 is provided at an inlet of the second blower 5, and a blower outlet electrically operated door 6 is provided at an outlet thereof. The second air preheater 21 is connected with the boiler furnace through two pipelines, wherein one pipeline is provided with an air preheater outlet electric door 18, and the other pipeline is provided with an air preheater inlet electric door 17. The second induced draft fan 13 is arranged on a pipeline of the second air preheater 2 leading to the flue gas tower, two ends of the second induced draft fan 13 are respectively provided with an inlet electric door 11 and an outlet electric door 14, and an induced draft fan inlet guide vane 12 is further arranged at the inlet of the second induced draft fan 13.
The outlet header of the first blower 2 and the outlet header of the second blower 5 are connected by a blower outlet header connecting door 19.
As shown in fig. 1, the boiler flue gas system of the thermal power plant according to the embodiment of the invention is also provided with other necessary pipelines, valves, relevant thermal engineering points and the like. The measuring points may be, for example, pressure measuring points
Temperature measuring point->
Flow measurement Point->
And waiting for measuring points.
In the embodiment of the invention, the blower provides the air required for combustion of the fuel in the hearth; the induced draft fan sucks high-temperature flue gas generated by combustion in the hearth out of the hearth and discharges the high-temperature flue gas to the atmosphere, and meanwhile, negative-pressure combustion of the hearth is maintained. The air preheater is rotated during operation and utilizes the heat of the flue gas to heat the air required for combustion. External air is fed through two blowers, heated by the air preheater, enters the secondary air box, and is distributed to the burner for supporting combustion by the secondary air box. The high-temperature flue gas generated after combustion is sucked out into the atmosphere by a draught fan after heat is recovered by an air preheater. The boiler flue gas system of the thermal power plant provided by the embodiment of the invention can provide a secondary wind field which can reliably burn and stably run for the boiler.
In one embodiment, ambient air is introduced into the first air preheater 20 via the first blower 2 and heated to enter the boiler furnace, or is introduced into the second air preheater 21 via the second blower 5 and heated to enter the boiler furnace. The first blower 2 and the second blower 5 may be operated simultaneously or may be standby, as the case may be, and the present invention is not limited thereto.
In one embodiment, the high temperature flue gas generated after combustion in the boiler furnace is extracted by the first induced draft fan 9 after heat recovery by the first air preheater 20 or is extracted by the second induced draft fan 13 after heat recovery by the second air preheater 21. The first induced draft fan 9 and the second induced draft fan 13 may work simultaneously or may be standby, and the present invention is not limited as the case may be.
In an embodiment, the boiler flue gas system of the thermal power plant further includes a first muffler 22 and a second muffler 23, the first muffler 22 is disposed at the inlet guide vane 1 of the first blower 2, and the second muffler 23 is disposed at the inlet guide vane 4 of the second blower 5 to reduce suction noise.
In an embodiment, the boiler flue gas system of a thermal power plant further includes: the boiler air and smoke system program control logic button A1, the induced draft fan negative pressure automatic button A2 and the forced draught blower air quantity automatic button A3. The buttons may be provided on a control panel of the distributed control system.
The embodiment of the invention also provides a start-stop control method of the boiler flue gas system of the thermal power plant, and an execution main body of the start-stop control method can be a computer system or a distributed control system. As shown in fig. 2, the start-stop control method mainly includes the following steps:
step S101, judging whether (1) the first air preheater inlet and outlet electric doors 16 and 15, the second air preheater inlet and outlet electric doors 17 and 18 are all closed, (2) the first induced draft fan inlet and outlet electric doors 7 and 10, the second induced draft fan inlet and outlet electric doors 11 and 14 are all closed, (3) the first and second blower outlet electric doors 3 and 6 are all closed, (4) the blower outlet main pipe connecting door 19 is closed, (5) the first induced draft fan inlet guide vane 8 and the second induced draft fan inlet guide vane 12 are all closed, and (6) the first and second blower inlet guide vanes 1 and 4 are all closed. If one of the above six conditions is not satisfied, step S102 is performed to issue an instruction to close the first air preheater inlet and outlet electric doors 16 and 15, the second air preheater inlet and outlet electric doors 17 and 18, and an instruction to close the first induced draft fan inlet and outlet electric doors 7 and 10, the second induced draft fan inlet and outlet electric doors 11 and 13, and an instruction to close the first and second forced draft fan outlet electric doors 3 and 6, and an instruction to close the forced draft fan outlet main pipe tie door 19, and an instruction to close the first and second induced draft fan inlet guide vanes 8 and 12, and an instruction to close the first and second forced draft fan inlet guide vanes 1 and 4. If the above six conditions are satisfied at the same time, step S103 is performed.
The purpose of steps S101-S102 is to close a series of valves of the boiler fume system in preparation for starting the boiler fume system.
Step S103, determining whether the first air preheater 20 and the second air preheater 21 are both activated. If either or both of the air preheaters are not activated, step S104 is performed to issue a command to activate the first air preheater 20 and the second air preheater 21. If both air preheaters are started, step S105 is performed.
Step S105, it is determined whether the inlet and outlet electric doors 16 and 15 of the first air preheater 20, and the inlet and outlet electric doors 17 and 18 of the second air preheater 21 are all opened. If one of the electric doors is not opened, a step S106 is performed to issue a command to open the first air preheater inlet and outlet electric doors 16 and 15, and the second air preheater inlet and outlet electric doors 17 and 18. If the first air preheater inlet and outlet electric doors 16 and 15, and the second air preheater inlet and outlet electric doors 17 and 18 are all open, step S107 is performed.
Step S107, judging whether (1) the first induced draft fan outlet electric door 10 is opened, (2) the second forced draught fan outlet electric door 6 is opened, (3) the forced draught fan outlet main pipe contact door 19 is opened. If one of the above three conditions is not satisfied, or if a plurality of the above conditions are not satisfied, step S108 is performed to issue an instruction to open the first induced draft fan outlet electric door 10, an instruction to open the second induced draft fan outlet electric door 6, and an instruction to open the induced draft fan outlet main pipe contact door 19. If the above three conditions are satisfied at the same time, step S109 is performed.
The purpose of steps S107-S108 is to open a series of valves in preparation for starting the first induced draft fan 9.
Step S109, judging whether the first induced draft fan 9 is started. If the first induced draft fan 9 is not started, the process proceeds to step S110, and an instruction to start the first induced draft fan 9 is issued. If the first induced draft fan 9 is started, step S111 is performed.
Step S111, determine whether the first induced draft fan inlet electric door 7 is opened. If the first induced draft fan inlet electric door 7 is not opened, the process proceeds to step S112, and a command to open the first induced draft fan inlet electric door 7 is issued. If the first induced draft fan inlet electric door 7 is opened, step S113 is performed.
Step S113, it is determined whether the first blower 2 is started. If the first blower 2 is not started, the process proceeds to step S114, where an instruction to start the first blower 2 is issued. If the first blower 3 is started, the process proceeds to step S115.
Step S115, judging whether (1) the first blower outlet electric door 3 is opened, (2) and the second blower outlet electric door 6 is closed. If either or both of the above conditions are not satisfied, step S116 is performed to issue an instruction to open the first blower outlet electric door 3 and an instruction to close the second blower outlet electric door 6. If the above two conditions are satisfied at the same time, step S117 is performed.
Step S117, it is determined whether the second blower 5 is started. If the second blower 5 is not started, the process proceeds to step S118, where a command to start the second blower 5 is issued. If the second blower 5 is started, the process proceeds to step S119.
Step S119, it is determined whether the second blower outlet electric door 6 is opened. If the second blower outlet electric door 6 is not opened, the process proceeds to step S120, and a command to open the second blower outlet electric door 6 is issued. If the second blower outlet motor door is opened, step S121 is performed.
Step S121, determine whether the second induced draft fan outlet electric door 14 is opened. If the second induced draft fan outlet electric door 14 is not opened, the process proceeds to step S122, and a command to open the second induced draft fan outlet electric door 14 is issued. If the second induced draft fan outlet electric door 14 is opened, step S123 is performed.
Step S123, judging whether the second induced draft fan 13 is started. If the second induced draft fan 13 is not started, the process proceeds to step S124, and an instruction to start the second induced draft fan 13 is issued. If the second induced draft fan 13 is started, step S125 is performed.
Step S125, determine whether (1) the second induced draft fan inlet electric door 11 is opened, (2) the blower outlet main pipe connecting door 19 is closed. If either or both of the above conditions are not satisfied, step S126 is performed to issue an instruction to open the second induced draft fan inlet electric door 11 and an instruction to close the blower outlet main pipe contact door 19. If the second induced draft fan inlet electric door 11 is opened and the blower outlet main pipe connecting door 19 is closed, step S127 is performed.
Step S127, judging whether (1) the first induced draft fan inlet guide vane 8 and the second induced draft fan inlet guide vane 12 have both thrown negative pressure automatic gear, and (2) the first blower inlet guide vane 1 and the second blower inlet guide vane 4 have both thrown air volume automatic gear. If one or both of the above conditions are not satisfied, step S128 is performed to issue a command to shift the negative pressure automatic shift positions of the first and second induced draft fan inlet guide vanes 8, 12 and a command to shift the air volumes of the first and second blower inlet guide vanes 1, 4 automatically.
After the negative pressure of the inlet guide vanes of the induced draft fan is input automatically, the inlet guide vanes of the induced draft fan automatically control the negative pressure of the hearth along with the change of the load. After the air quantity of the inlet guide vanes of the blower is input automatically, the inlet guide vanes of the blower automatically control the air quantity of the hearth along with the change of the load.
The start-stop control method shown in fig. 2 is used for controlling the start of the boiler smoke system of the thermal power plant, so the start-stop control method shown in fig. 2 can also be a start-up step of the boiler smoke system of the thermal power plant.
In one embodiment, the permission conditions for the start-up procedure are: (1) the air preheater lubricating oil system is normal; (2) the blower lubricating oil system and the induced draft fan lubricating oil system are normal. That is, before step S101 is performed, it is necessary to determine in advance whether the air preheater lubrication oil system, the blower lubrication oil system, and the induced draft fan lubrication oil system are normal, and if the above three lubrication oil systems are normal, the boiler wind and smoke system is allowed to be started.
The embodiment of the invention also provides a start-stop control method of the boiler smoke system of the thermal power plant, and an execution main body of the start-stop control method can be a computer system or a distributed control system. As shown in fig. 3, the start-stop control method mainly includes the following steps:
step S2101, determines whether or not both the first blower 2 and the second blower 5 have been operated to the minimum air volume. If one of the two blowers is not operated to the minimum air volume or neither blower is operated to the minimum air volume, step S202 is performed to issue a command to close the first blower inlet guide vane 1 and the second blower inlet guide vane 4. If both the first blower 2 and the second blower 5 have been operated to the minimum air volume, step S203 is performed.
Step S203, it is determined whether (1) the first blower 2 and the second blower 5 have both stopped, and (2) the first induced draft fan 9 and the second induced draft fan 13 have both stopped. If one of the fans is not stopped or a plurality of fans is not stopped, step S204 is performed to issue a command to stop the operation of the first fan 2 and the second fan 5 and a command to stop the operation of the first fan 9 and the second fan 13. If both blowers and both induced draft fans have stopped, step S205 is performed.
Step S205, determining whether (1) the first blower inlet guide vane 1 and the second blower inlet guide vane 4 are both closed, (2) and the first induced draft fan inlet guide vane 8 and the second induced draft fan inlet guide vane 12 are both closed. If one of the inlet guide vanes is not closed, or a plurality of inlet guide vanes are not closed, step S206 is performed, and a command is issued to close the first blower inlet guide vane 1 and the second blower inlet guide vane 4, and to close the first induced draft fan inlet guide vane 8 and the second induced draft fan inlet guide vane 12. If the inlet guide vanes of the four fans are all closed, step S207 is performed.
Step S207, judging whether the inlet flue gas temperature of the first air preheater 20 and the second air preheater 21 is lower than a preset temperature. If the inlet flue gas temperature of the first air preheater 20 and the second air preheater 21 is below the preset temperature, step S208 is performed.
In one embodiment, the predetermined temperature is 120 °.
Step S208, it is determined whether (1) the first air preheater 20 and the second air preheater 21 are both stopped, (2) the first air preheater inlet and outlet electric doors 16 and 15, and the second air preheater inlet and outlet electric doors 17 and 18 are both closed. If either one of the above conditions is not satisfied, or neither condition is satisfied, step S209 is performed to issue a command to stop the first air preheater 20 and the second air preheater 21, and a command to close the first air preheater inlet and outlet electric doors 16 and 15, and the second air preheater inlet and outlet electric doors 17 and 18.
The start-stop control method shown in fig. 3 is used for controlling the stop of the boiler fume system of the thermal power plant, so the start-stop control method of fig. 3 can be called a stop step of the boiler fume system of the thermal power plant.
In one embodiment, the permission conditions for stopping the sequence of steps are: the boiler has stopped running. That is, before step S201 is performed, it is necessary to determine in advance whether the boiler has stopped operating, and if the boiler has stopped operating, stopping is permitted.
The start-stop control method shown in fig. 2 and fig. 3 is program control logic of a boiler fume system of a thermal power plant in an embodiment of the invention. The following functions can be implemented with the program control logic: under the state of complete stop of a boiler fume system of a thermal power plant, the automatic start of the boiler fume system is realized; under the running state of a boiler fume system of a thermal power plant, the automatic stop of the boiler fume system is realized; when the starting program of the boiler air and smoke system of the thermal power plant runs to a certain step, the condition is not satisfied, if the condition can be ignored by artificial judgment, the jump action can be manually carried out to continue the running of the starting program until the boiler air and smoke system is started.
Each step in the start-stop control method shown in fig. 2 and 3 is to judge whether feedback is received, if so, the next step is continued; if not, an instruction is sent to wait for feedback to be received. When the due feedback signal is not received, the program control logic stays in the step and waits for the worker to operate. The power plant operator can find the feedback signal which is not received by the current running step sequence, and manually judge whether the feedback signal which is not received influences the continuous execution of the program control logic. If the feedback signal does not influence the continuation of the current program control logic, the operator can operate the skip action to continue the execution of the program control logic; if the feedback signal affects the continuation of the current program control logic, the operator can purposefully check the problem according to each detected unsatisfied feedback signal until the feedback signal is received, and then the program control logic is continuously executed.
By the start-stop control method in fig. 2 and 3, the automatic start of the boiler air-smoke system can be realized in the state of full stop of the boiler air-smoke system in the thermal power plant; under the running state of the boiler fume system of the thermal power plant, the automatic stop of the boiler fume system is realized.
It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The principles and embodiments of the present invention have been described in detail with reference to specific examples, which are provided to facilitate understanding of the method and core ideas of the present invention; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present invention, the present description should not be construed as limiting the present invention in view of the above.
Claims (5)
1. The method for controlling the start and stop of the boiler fume system of the thermal power plant is characterized by comprising the following steps of: the system comprises a first air preheater, a second air preheater, a first blower, a second blower, a first induced draft fan, a second induced draft fan, a blower outlet main pipe connecting door and a plurality of pipelines;
the first air blower is connected with the first air preheater through a pipeline, an air blower inlet guide vane is arranged at the inlet of the first air blower, and an air blower outlet electric door is arranged at the outlet of the first air blower; the first air preheater is connected with a boiler hearth through two pipelines, one pipeline is provided with an air preheater outlet electric door, and the other pipeline is provided with an air preheater inlet electric door; the first induced draft fan is arranged on a pipeline of the first air preheater leading to the flue gas tower, two ends of the first induced draft fan are respectively provided with an inlet electric door and an outlet electric door, and an inlet guide vane of the induced draft fan is further arranged at the inlet of the first induced draft fan;
the second air blower is connected with the second air preheater through a pipeline, an air blower inlet guide vane is arranged at the inlet of the second air blower, and an air blower outlet electric door is arranged at the outlet of the second air blower; the second air preheater is connected with the boiler furnace through two pipelines, one pipeline is provided with an air preheater outlet electric door, and the other pipeline is provided with an air preheater inlet electric door; the second induced draft fan is arranged on a pipeline of the second air preheater leading to the flue gas tower, two ends of the second induced draft fan are respectively provided with an inlet electric door and an outlet electric door, and an inlet guide vane of the induced draft fan is further arranged at the inlet of the second induced draft fan;
the outlet main pipe of the first air blower and the outlet main pipe of the second air blower are communicated through the air blower outlet main pipe connecting door;
the start-stop control method of the boiler smoke system of the thermal power plant comprises the following steps of:
judging whether the first air preheater inlet electric door and the outlet electric door, the second air preheater inlet electric door and the outlet electric door are closed, the first induced draft fan inlet electric door and the outlet electric door, the second induced draft fan inlet electric door and the outlet electric door are closed, the first forced draught blower outlet electric door and the second forced draught blower outlet electric door are closed, the forced draught blower outlet main pipe connecting door is closed, the first induced draft fan inlet guide vane and the second induced draft fan inlet guide vane are closed, and the first forced draught blower inlet guide vane and the second forced draught blower inlet guide vane are closed; if not, sending out instructions for closing the first air preheater inlet electric door and the outlet electric door, the second air preheater inlet electric door and the outlet electric door, and instructions for closing the first induced draft fan inlet electric door and the outlet electric door, the second induced draft fan inlet electric door and the outlet electric door, and instructions for closing the first blower outlet electric door and the second blower outlet electric door, and instructions for closing the blower outlet main pipe connecting door, and instructions for closing the first induced draft fan inlet guide vane and the second induced draft fan inlet guide vane, and instructions for closing the first blower inlet guide vane and the second blower inlet guide vane;
if yes, judging whether the first air preheater and the second air preheater are started; if the first air preheater is not started and/or the second air preheater is not started, sending out an instruction for starting the first air preheater and the second air preheater;
if the first air preheater and the second air preheater are started, judging whether the inlet electric door and the outlet electric door of the first air preheater and the inlet electric door and the outlet electric door of the second air preheater are opened; if not, sending out an instruction for opening the inlet electric door and the outlet electric door of the first air preheater and the inlet electric door and the outlet electric door of the second air preheater;
if the inlet electric door and the outlet electric door of the first air preheater and the inlet electric door and the outlet electric door of the second air preheater are all opened, judging whether the outlet electric door of the first induced draft fan is opened, the outlet electric door of the second induced draft fan is opened, and the main pipe connecting door of the outlet of the induced draft fan is opened; if not, sending out an instruction for opening the electric door at the outlet of the first induced draft fan, an instruction for opening the electric door at the outlet of the second induced draft fan and an instruction for opening the main pipe contact door at the outlet of the induced draft fan;
if the first induced draft fan outlet electric door is opened and the second induced draft fan outlet electric door is opened and the main pipe connecting door of the induced draft fan outlet is opened, judging whether the first induced draft fan is started; if the first induced draft fan is not started, sending out an instruction for starting the first induced draft fan;
if the first induced draft fan is started, judging whether an inlet electric door of the first induced draft fan is opened; if the first induced draft fan inlet electric door is not opened, an instruction for opening the first induced draft fan inlet electric door is sent;
if the inlet electric door of the first induced draft fan is opened, judging whether the first forced draught fan is started; if the first air blower is not started, sending an instruction for starting the first air blower;
if the first blower is started, judging whether a first blower outlet electric door is opened and a second blower outlet electric door is closed; if the first blower outlet electric door is not opened and/or the second blower outlet electric door is not closed, sending an instruction for opening the first blower outlet electric door and an instruction for closing the second blower outlet electric door;
if the first blower outlet electric door is opened and the second blower outlet electric door is closed, judging whether the second blower is started; if the second air blower is not started, sending out an instruction for starting the second air blower;
if the second air blower is started, judging whether a second air blower outlet electric door is opened; if the second blower outlet electric door is not opened, sending an instruction for opening the second blower outlet electric door;
if the second blower outlet electric door is opened, judging whether the second induced draft blower outlet electric door is opened; if the second induced draft fan outlet electric door is not opened, sending an instruction for opening the second induced draft fan outlet electric door;
if the second induced draft fan outlet electric door is opened, judging whether the second induced draft fan is started; if the second induced draft fan is not started, sending out an instruction for starting the second induced draft fan;
if the second induced draft fan is started, judging whether an inlet electric door of the second induced draft fan is opened and a main pipe connecting door of an outlet of the air blower is closed; if the second induced draft fan inlet electric door is not opened and/or the blower outlet main pipe connecting door is not closed, sending an instruction for opening the second induced draft fan inlet electric door and an instruction for closing the blower outlet main pipe connecting door;
if the second induced draft fan inlet electric door is opened and the blower outlet main pipe connecting door is closed, judging whether the first induced draft fan inlet guide vane and the second induced draft fan inlet guide vane are both provided with negative pressure automatic gears and the first blower inlet guide vane and the second blower inlet guide vane are both provided with air quantity automatic gears; if not, sending out an instruction of throwing negative pressure automatic gear to the inlet guide vanes of the first induced draft fan and the inlet guide vanes of the second induced draft fan, and an instruction of throwing air quantity automatic gear to the inlet guide vanes of the first air blower and the inlet guide vanes of the second air blower.
2. The start-stop control method for a boiler fume system of a thermal power plant according to claim 1, characterized in that the start-stop control method for a boiler fume system of a thermal power plant further comprises the steps of:
judging whether the first air feeder and the second air feeder are operated to the minimum air quantity; if the first blower and/or the second blower do not run to the minimum air quantity, sending a command for closing the first blower inlet guide vane and the second blower inlet guide vane;
if the first air blower and the second air blower are operated to the minimum air quantity, judging whether the first air blower and the second air blower are stopped, and stopping the operation of the first induced draft fan and the second induced draft fan; if not, sending out an instruction for stopping running the first blower and the second blower and an instruction for stopping running the first induced draft fan and the second induced draft fan;
if the first blower and the second blower are stopped, and the first induced draft fan and the second induced draft fan are stopped, judging whether the first blower inlet guide vane and the second blower inlet guide vane are closed, and the first induced draft fan inlet guide vane and the second induced draft fan inlet guide vane are closed; if not, sending out an instruction for closing the first blower inlet guide vane and the second blower inlet guide vane and an instruction for closing the first induced draft fan inlet guide vane and the second induced draft fan inlet guide vane;
if the first blower inlet guide vane and the second blower inlet guide vane are both closed and the first induced draft fan inlet guide vane and the second induced draft fan inlet guide vane are both closed, judging whether the inlet flue gas temperature of the first air preheater and the second air preheater is lower than a preset temperature;
if the inlet flue gas temperature of the first air preheater and the second air preheater is lower than the preset temperature, judging whether the first air preheater and the second air preheater are stopped, and the first air preheater inlet electric door and the outlet electric door and the second air preheater inlet electric door and the outlet electric door are closed; if not, the first air preheater and the second air preheater are stopped, and the first air preheater inlet electric door and the outlet electric door and the second air preheater inlet electric door and the outlet electric door are closed.
3. The start-stop control method for a boiler fume system of a thermal power plant according to claim 1, characterized in that the start-stop control method for a boiler fume system of a thermal power plant further comprises the steps of:
judging whether the air preheater lubricating oil system is normal or not, and judging whether the blower lubricating oil system and the induced draft fan lubricating oil system are normal or not;
if the air preheater lubricating oil system is normal, and the blower lubricating oil system and the induced draft fan lubricating oil system are normal, judging whether the first air preheater inlet electric door and the outlet electric door, the second air preheater inlet electric door and the outlet electric door are closed, and the first induced draft fan inlet electric door and the outlet electric door, the second induced draft fan inlet electric door and the outlet electric door are closed, and the first blower outlet electric door and the second blower outlet electric door are closed, and the blower outlet main pipe connecting door is closed, and the first induced draft fan inlet guide vane and the second induced draft fan inlet guide vane are closed, and the first blower inlet guide vane and the second blower inlet guide vane are closed.
4. The start-stop control method for a boiler fume system of a thermal power plant according to claim 2, characterized in that the start-stop control method for a boiler fume system of a thermal power plant further comprises the steps of:
judging whether the boiler stops running or not;
if the boiler has stopped running, it is determined whether both the first blower and the second blower have been operated to the minimum air volume.
5. The method for controlling start-stop of a boiler flue gas system of a thermal power plant according to claim 2, wherein the preset temperature is 120 °.
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| CN112413639B (en) * | 2020-11-17 | 2022-10-04 | 上海呈彧智能科技有限公司 | Intelligent control method and system for combustion-supporting air volume of heating furnace group |
| CN114234203B (en) * | 2021-12-27 | 2024-08-06 | 深圳能源环保股份有限公司 | Exhaust system for preventing odor from overflowing during start-up and shutdown of garbage incineration power plant |
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| CN102042605A (en) * | 2011-01-27 | 2011-05-04 | 章礼道 | Side-to-side thermal deashing method for rotary air preheater |
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