CN115013084B - Low-pressure cylinder zero-output-based coal-fired unit monitoring method and device - Google Patents
Low-pressure cylinder zero-output-based coal-fired unit monitoring method and device Download PDFInfo
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D21/00—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D21/00—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for
- F01D21/003—Arrangements for testing or measuring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D21/00—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for
- F01D21/12—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for responsive to temperature
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/08—Cooling; Heating; Heat-insulation
- F01D25/12—Cooling
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
Abstract
The invention provides a coal-fired unit monitoring method and device based on low-pressure cylinder zero output, wherein the coal-fired unit monitoring method based on low-pressure cylinder zero output comprises the following steps: determining the pressure and the temperature which are applied by a shaft seal of the coal-fired unit according to the vibration parameters of a high pressure cylinder and a medium pressure cylinder of the coal-fired unit under the working condition of zero output of the low pressure cylinder; determining the water spraying flow of the low-pressure cylinder according to the final-stage exhaust steam temperature of the coal-fired unit under the working condition of zero output of the low-pressure cylinder; and determining the damage point of the low-pressure cylinder spray head through a low-pressure cylinder flow field under the working condition of zero output of the low-pressure cylinder. The invention provides a coal-fired unit monitoring method under the working condition of zero output of a low-pressure cylinder, which can enhance the safety and the operation economy of equipment of the coal-fired unit under the working condition of zero output of the low-pressure cylinder so as to ensure the peak shaving reliability of the unit.
Description
Technical Field
The application belongs to the technical field of monitoring during phase operation of coal-fired units, in particular to the technical field of zero output of a low-pressure cylinder, and particularly relates to a coal-fired unit monitoring method and device based on zero output of the low-pressure cylinder.
Background
With the continuous and rapid increase of renewable energy grid-connected capacity, the peak regulation demand of a power grid is increased, so that the peak regulation potential of a thermal power unit needs to be exploited, and the new energy consumption capability and the power grid stability are improved.
In recent years, zero output of a low-pressure cylinder is used as an effective technical means for improving the peak regulation capacity of a unit in a heat supply period so as to promote new energy consumption. Referring to fig. 1, the method is a heating technology which uses most of exhaust steam of a medium pressure cylinder for heating, and a very small amount of exhaust steam is introduced into a low pressure cylinder to take away the blast heat of a low pressure blade. The low-pressure cylinder zero-output and full-output on-line switching is realized through the switch of the low-pressure butterfly valve, so that the low-pressure cylinder zero-output can realize deep peak regulation of a unit in the power grid trough stage, and the low-pressure cylinder full-output can operate in the power grid peak stage, thereby meeting the power consumption requirement of a power grid, realizing waste heat recovery, meeting the power grid peak-valley requirement and realizing thermoelectric decoupling.
Because the method has a short implementation history and belongs to a newer scheme, the method still has a certain equipment risk from the theoretical point of view.
Disclosure of Invention
The invention discloses a coal-fired unit monitoring method and device based on zero output of a low-pressure cylinder, and provides a coal-fired unit monitoring method under the working condition of zero output of the low-pressure cylinder, which can enhance the equipment safety and the operation economy of the unit and ensure the peak regulation reliability of the unit.
In order to solve the technical problems, the invention provides the following technical scheme:
in a first aspect, the invention provides a coal-fired unit monitoring method based on zero output of a low-pressure cylinder, comprising the following steps:
determining the pressure and the temperature which are applied by a shaft seal of the coal-fired unit according to vibration parameters of a high pressure cylinder and a medium pressure cylinder of the coal-fired unit under the working condition of zero output of the low pressure cylinder;
determining the water spraying flow of the low-pressure cylinder according to the final-stage exhaust steam temperature of the coal-fired unit under the working condition of zero output of the low-pressure cylinder;
and determining the damage point of the low-pressure cylinder spray head through the low-pressure cylinder flow field under the working condition of zero output of the low-pressure cylinder.
In an embodiment, the determining the pressure and the temperature to be applied by the shaft seal of the coal-fired unit according to the vibration parameters of the high pressure cylinder and the medium pressure cylinder of the coal-fired unit under the working condition of zero output of the low pressure cylinder includes:
respectively determining respective bearing bush vibration parameters of the high-pressure cylinder and the medium-pressure cylinder;
and determining the pressure and the temperature which are applied by the shaft seal according to the vibration parameters of the bearing bush.
In one embodiment, the method for monitoring the coal-fired unit based on zero output of the low pressure cylinder further comprises the following steps:
and determining the cooling flow of the low-pressure cylinder according to the water spraying flow of the low-pressure cylinder.
In one embodiment, the method for monitoring the coal-fired unit based on zero output of the low pressure cylinder further comprises the following steps:
and measuring the temperature of the blade tip of the low-pressure cylinder in the water spraying process of the low-pressure cylinder to establish a flow field of the low-pressure cylinder.
In one embodiment, the method for monitoring the coal-fired unit based on zero output of the low pressure cylinder further comprises the following steps:
establishing a limited volume grid of a low-pressure cylinder circulation area under the working condition of zero output of the low-pressure cylinder;
establishing a low-pressure cylinder circulation flow field according to the flow of the limited volume grid and the low-pressure cylinder circulation area;
and optimizing the water spraying mode, the steam flow, the water spraying flow, the particle size of the atomized water drops and the movement track of the atomized water drops of the low-pressure cylinder under the working condition of zero output of the low-pressure cylinder according to the flow field of the low-pressure cylinder.
In a second aspect, the present invention provides a low pressure cylinder zero output based coal-fired unit monitoring device, the device comprising:
the pressure and temperature determining module is used for determining the pressure and the temperature which are required to be applied by the shaft seal of the coal-fired unit according to the vibration parameters of the high pressure cylinder and the medium pressure cylinder of the coal-fired unit under the working condition of zero output of the low pressure cylinder;
the water spray flow determining module is used for determining the water spray flow of the low-pressure cylinder according to the final-stage exhaust steam temperature of the coal-fired unit under the working condition of zero output of the low-pressure cylinder;
and the damage point determining module is used for determining the damage point of the low-pressure cylinder spray head through the low-pressure cylinder flow field under the working condition of zero output of the low-pressure cylinder.
In one embodiment, the pressure temperature determination module includes:
the vibration parameter determining unit is used for determining the vibration parameters of the bearing bushes of the high-pressure cylinder and the medium-pressure cylinder respectively;
and the temperature and pressure determining unit is used for determining the pressure and the temperature which the shaft seal should apply according to the vibration parameters of the bearing bush.
In one embodiment, the low pressure cylinder zero output-based coal-fired unit monitoring device further comprises:
and the cooling flow determining module is used for determining the cooling flow of the low-pressure cylinder according to the water spraying flow of the low-pressure cylinder.
In one embodiment, the low pressure cylinder zero output-based coal-fired unit monitoring device further comprises:
the low-pressure cylinder flow field establishing module is used for measuring the temperature of the blade tip of the low-pressure cylinder in the water spraying process of the low-pressure cylinder to establish the low-pressure cylinder flow field.
In one embodiment, the low pressure cylinder zero output-based coal-fired unit monitoring device further comprises:
the grid establishing module is used for establishing a limited-volume grid of the low-pressure cylinder circulation area under the working condition of zero output of the low-pressure cylinder;
the flow field establishing module is used for establishing a low-pressure cylinder flow field according to the limited volume grid and the flow of the low-pressure cylinder flow area;
and the construction mode optimizing module is used for optimizing the low-pressure cylinder water spraying mode, the steam flow, the water spraying flow, the atomized water drop particle size and the movement track of the atomized water drops under the low-pressure cylinder zero-output working condition according to the low-pressure cylinder flow field.
In a third aspect, the present invention provides an electronic device comprising a memory, a processor and a computer program stored on the memory and operable on the processor, the processor executing the program to perform the steps of a method for monitoring a coal-fired unit based on zero output of a low pressure cylinder.
In a fourth aspect, the present invention provides a computer readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of a low pressure cylinder zero output based coal burning unit monitoring method.
As can be seen from the above description, the embodiment of the present invention provides a method and an apparatus for monitoring a coal-fired unit based on zero output of a low pressure cylinder, and the corresponding method includes: firstly, determining the pressure and the temperature which are applied by a shaft seal of a coal-fired unit according to vibration parameters of a high pressure cylinder and a medium pressure cylinder of the coal-fired unit under a low pressure cylinder zero-output working condition; then, determining the water spraying flow of the low-pressure cylinder according to the final-stage exhaust steam temperature of the coal-fired unit under the working condition of zero output of the low-pressure cylinder; and finally, determining the damage point of the low-pressure cylinder spray head through a low-pressure cylinder flow field under the working condition of zero output of the low-pressure cylinder. The invention provides a coal-fired unit monitoring method under the working condition of zero output of a low-pressure cylinder, which can enhance the safety and the operation economy of equipment of the coal-fired unit under the working condition of zero output of the low-pressure cylinder so as to ensure the peak shaving reliability of the unit.
Drawings
In order to more clearly illustrate the embodiments of the present 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, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic flow chart of a method for monitoring a coal-fired unit based on zero output of a low pressure cylinder in an embodiment of the invention;
FIG. 2 is a flow chart of step 100 in an embodiment of the invention;
FIG. 3 is a second flow chart of a method for monitoring a coal-fired unit based on zero output of a low pressure cylinder in an embodiment of the invention;
FIG. 4 is a third flow chart of a method for monitoring a coal-fired unit based on zero output of a low pressure cylinder in an embodiment of the invention;
FIG. 5 is a schematic diagram of the final flow field test results of the low pressure cylinder in an embodiment of the present invention;
FIG. 6 is a flow chart of a method for monitoring a coal-fired unit based on zero output of a low pressure cylinder according to an embodiment of the invention;
FIG. 7 is a schematic flow chart of a method for monitoring a coal-fired unit based on zero output of a low pressure cylinder in an embodiment of the invention;
FIG. 8 is a block diagram I of a low pressure cylinder zero output based coal-fired unit monitoring device in accordance with an embodiment of the present invention;
FIG. 9 is a block diagram of the pressure and temperature determination module 10 according to an embodiment of the present invention;
FIG. 10 is a block diagram II of a low pressure cylinder zero output based coal-fired unit monitoring device in accordance with an embodiment of the present invention;
FIG. 11 is a third block diagram of a low pressure cylinder zero output based coal-fired unit monitoring device in accordance with an embodiment of the present invention;
FIG. 12 is a block diagram of a low pressure cylinder zero output based coal-fired unit monitoring device in accordance with an embodiment of the present invention;
fig. 13 is a schematic structural diagram of an electronic device in an embodiment of the invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. 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.
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.
It should be noted that the terms "comprises" and "comprising," and any variations thereof, in the description and claims of the present application and in the foregoing figures, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed or inherent to such process, method, article, or apparatus.
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
The embodiment of the invention provides a specific implementation mode of a coal-fired unit monitoring method based on zero output of a low-pressure cylinder, and referring to fig. 1, the method specifically comprises the following steps:
step 100: determining the pressure and the temperature which are applied by a shaft seal of the coal-fired unit according to vibration parameters of a high pressure cylinder and a medium pressure cylinder of the coal-fired unit under the working condition of zero output of the low pressure cylinder;
specifically, after the coal-fired unit is switched to zero-output working condition operation, the low-pressure cylinder operation working condition is changed, particularly, the low-pressure shaft seal parameter is changed, and the low-pressure cylinder water spraying is put into operation, so that the vibration of the unit is easily caused to be deteriorated, and the unit operation and working condition are possibly required to be optimized, so that the equipment operation safety is ensured. In the invention, the shaft seal pressure and temperature parameters are improved through operation optimization, stability is maintained, and the vibration stability of the unit is observed.
Step 200: determining the water spraying flow of the low-pressure cylinder according to the final-stage exhaust steam temperature of the coal-fired unit under the working condition of zero output of the low-pressure cylinder;
it can be understood that the unit blades are extremely easy to erode due to the input of water spraying of the final low-pressure cylinder, so that the water spraying flow of the low-pressure cylinder is required to be optimized to ensure the operation safety of the turbine blades. And stabilizing the cooling flow of the low-pressure cylinder to a design flow value, observing the temperature change of the exhaust steam of the final stage by adjusting the water spraying flow of the low-pressure cylinder, and ensuring that each temperature observation point of the final stage meets the operation requirement while reducing the water spraying flow of the low-pressure cylinder as much as possible.
Step 300: and determining the damage point of the low-pressure cylinder spray head through the low-pressure cylinder flow field under the working condition of zero output of the low-pressure cylinder.
Specifically, by measuring the variation of a blade top temperature difference field in the low-pressure cylinder water spray flow optimization process, a working condition deterioration point of a low-pressure cylinder water spray nozzle is found, and data support is provided for follow-up low-pressure nozzle reconstruction optimization; meanwhile, flow field measurement under normal working conditions of the low-pressure cylinder is performed, and data check can be provided by next numerical study.
As can be seen from the above description, the embodiment of the present invention provides a method for monitoring a coal-fired unit based on zero output of a low pressure cylinder, including: firstly, determining the pressure and the temperature which are applied by a shaft seal of a coal-fired unit according to vibration parameters of a high pressure cylinder and a medium pressure cylinder of the coal-fired unit under a low pressure cylinder zero-output working condition; then, determining the water spraying flow of the low-pressure cylinder according to the final-stage exhaust steam temperature of the coal-fired unit under the working condition of zero output of the low-pressure cylinder; and finally, determining the damage point of the low-pressure cylinder spray head through a low-pressure cylinder flow field under the working condition of zero output of the low-pressure cylinder. The invention provides a coal-fired unit monitoring method under the working condition of zero output of a low-pressure cylinder, which can enhance the safety and the operation economy of equipment of the coal-fired unit under the working condition of zero output of the low-pressure cylinder so as to ensure the peak shaving reliability of the unit.
In one embodiment, referring to fig. 2, step 100 comprises:
step 101: respectively determining respective bearing bush vibration parameters of the high-pressure cylinder and the medium-pressure cylinder;
step 102: and determining the pressure and the temperature which are applied by the shaft seal according to the vibration parameters of the bearing bush.
In the switching process of the zero-output working condition of the low-pressure cylinder in step 101 and step 102, the vibration of the bearing bushes at the two sides of the high and the medium pressure of the coal-fired unit is changed, preferably, the vibration of 1 watt is observed to slowly rise from 40 mu m to 80 mu m, and at the moment, the shaft seal pressure and the temperature are tried to be improved, so that the parameters are consistent with those before the working condition is switched, the pressure is 35kPa, and the temperature is 240 ℃.
In one embodiment, referring to fig. 3, the method for monitoring the coal-fired unit based on zero output of the low pressure cylinder further comprises:
step 400: and determining the cooling flow of the low-pressure cylinder according to the water spraying flow of the low-pressure cylinder.
In order to reduce the influence of water erosion, the test of the invention optimizes the cooling flow of the low-pressure cylinder so as to meet the operation requirement under the condition of not throwing water into the low-pressure cylinder. And (3) increasing the cooling flow of the low-pressure cylinder to a preset multiple (for example, twice) of the design flow, gradually reducing the water spraying flow of the low-pressure cylinder, and simultaneously monitoring each temperature measuring point of the exhaust steam. If the exhaust steam temperature can not meet the normal operation requirement while reducing the water spray flow, further increasing the cooling flow, and reducing the water spray flow again until the water spray of the low-pressure cylinder is completely closed; if the final stage exhaust steam temperature still has safe operation allowance after the water spray flow is totally closed, slowly reducing the cooling flow of the low-pressure cylinder until the exhaust steam temperature just meets the safe operation requirement. Through the test, the minimum cooling flow without throwing in the water sprayed by the low-pressure cylinder can be obtained.
In one embodiment, referring to fig. 4, the method for monitoring the coal-fired unit based on zero output of the low pressure cylinder further comprises:
step 500: and measuring the temperature of the blade tip of the low-pressure cylinder in the water spraying process of the low-pressure cylinder to establish a flow field of the low-pressure cylinder.
Specifically, the final flow field of the low-pressure cylinder is measured first, and the distribution of the final blade rear flow field under the working condition of zero output of the low-pressure cylinder is actually measured, as shown in fig. 5. And then, by measuring the change of the temperature difference field of the blade tip in the low-pressure cylinder water spray flow optimization process, the working condition deterioration point of the low-pressure cylinder water spray nozzle is searched, and data support is provided for the follow-up low-pressure nozzle reconstruction optimization.
In one embodiment, referring to fig. 6, the method for monitoring the coal-fired unit based on zero output of the low pressure cylinder further comprises:
step 600: establishing a limited volume grid of a low-pressure cylinder circulation area under the working condition of zero output of the low-pressure cylinder;
step 700: establishing a low-pressure cylinder circulation flow field according to the flow of the limited volume grid and the low-pressure cylinder circulation area;
step 800: and optimizing the water spraying mode, the steam flow, the water spraying flow, the particle size of the atomized water drops and the movement track of the atomized water drops of the low-pressure cylinder under the working condition of zero output of the low-pressure cylinder according to the flow field of the low-pressure cylinder.
In steps 600 to 800, firstly, simulation of a low-pressure cylinder through-flow field, specifically, model analysis (preferably, the model analysis comprises low-pressure cylinder numerical model establishment and a low-pressure cylinder finite element model) is carried out, and modeling of a low-pressure cylinder through-flow region and partitioning of a corresponding finite volume grid are completed; calculating a flow field of a through-flow area of a low-pressure cylinder of the steam turbine, and checking and verifying by adopting a THA working condition thermal equilibrium diagram and test measurement data through a numerical method; then, under the working condition of zero output force, the low-pressure flow field is deeply researched, and the influence of the changes of the steam inlet flow rate, the steam inlet temperature and the steam outlet pressure of the low-pressure cylinder on the final-stage flow field and the temperature field of the low-pressure cylinder is explored; then, researching a final temperature field and a flow field under the condition of water spraying and temperature reduction, and exploring the influence of a water spraying mode and water spraying flow on the final flow field and the temperature field; and finally, researching different water spraying modes, low-pressure cylinder steam inlet flow, water spraying flow, atomized water drop particle size and movement tracks of atomized water drops generated by water spraying when the working condition of the guide ring steam exhaust channel exists, determining the area distribution and degree of the atomized water drops striking the blade, researching reasonable low-pressure cylinder blade water erosion resistance coating and the like.
Finally, through simulation calculation, the minimum low-pressure cylinder water spray flow and the collision parameters of low-pressure cylinder water spray liquid drops on the final-stage blade are determined, so that theoretical basis is provided for low-pressure water spray nozzle reconstruction optimization, nozzle position optimization and final-stage blade water erosion resistant coating.
In one embodiment, referring to FIG. 7, the invention also provides an embodiment of a method for monitoring a coal-fired unit based on zero low pressure cylinder output.
It can be understood that the low-pressure cylinder zero-output working condition debugging is a working condition switching test of the low-pressure cylinder zero-output capability of the unit after the low-pressure cylinder zero-output modification, and the capability of the unit to meet the low-pressure cylinder zero-output working condition operation is evaluated. The method is used for comprehensively guaranteeing the operation safety of the low-unit zero-output working condition, and can be used for performing a switching test of the steam turbine from the extraction condensing working condition to the low-pressure cylinder zero-output working condition, a variable cooling flow test, a variable back pressure test, a variable low-pressure cylinder water spray flow test, a lifting load test under the low-pressure cylinder zero-output working condition, switching of the steam turbine from the low-pressure cylinder zero-output working condition to the extraction condensing working condition and the like. In the specific embodiment, the debugging comprises actual measurement optimization in the aspects of unit vibration, low-pressure cylinder water spray flow, low-pressure cylinder cooling flow and the like.
S1: optimizing the vibration of the unit;
s2: optimizing the water spraying flow of the low-pressure cylinder;
specifically, by adjusting the water spraying flow of the low-pressure cylinder, the temperature change of the exhaust steam of the final stage is observed, the water spraying flow of the low-pressure cylinder is reduced as much as possible, and meanwhile, each temperature observation point of the final stage is ensured to meet the operation requirement (the specific parameter conditions are different because the positions of each measurement point are different, and the general requirement is below 70 ℃).
S3: optimizing the cooling flow of the low-pressure cylinder;
the minimum cooling flow rate without the injection of the low-pressure cylinder water can be obtained by step S3.
S4: analyzing the working condition of zero output energy efficiency of the low-pressure cylinder;
specifically, the thermodynamic system modeling is performed based on a unit thermodynamic system and a THA thermal equilibrium diagram. The model designs the sub-equipment such as a steam turbine, a generator, a boiler, a regenerative system and the like, and builds a pure condensation working condition model of the unit. And calculating the accuracy of the verification model by adopting a variable working condition simulation comparison method. The model is established by adopting THA working condition heat balance data, model parameter verification of partial load working conditions is carried out, thermal parameters such as model output power, steam extraction flow, steam extraction parameters and the like are calculated through main steam flow in given partial load working conditions, and the thermal parameters are compared with the heat balance data, so that feasibility of modeling and calculating methods is verified.
On the other hand, based on the model built under the set pure condensation working condition, the model building under the low-pressure cylinder zero-output working condition is performed, and the model building is based on design parameters. And (3) carrying out simulation calculation on the capacity working condition of the unit under the zero-output operation mode of the low-pressure cylinder, and researching the heat supply capacity, the peak regulation capacity, the coal consumption characteristic and the like.
And the energy-saving potential is researched and the operation parameters are optimized by comparing the energy-saving potential with the test data of the actual low-pressure cylinder zero-output working condition. For example, the actual operating heat supply network drain cooler lower end difference was found to be 25 ℃, while the design end difference was found to be 5.6 ℃, and the coal consumption difference for different conditions was found to be obvious by comparison, as shown in table 1. The coal consumption under the respective working conditions of 25 ℃ is increased by 7.3 g/(kw.h) compared with the end difference of 5.6 ℃, thereby optimizing the running operation of the drain cooler.
TABLE 1
Further, the thermodynamic system is optimized in this specific application example. For example, the heat supply network is recycled in a hydrophobic manner and directly collected into the shaft seal heater and then condensed. After heat recovery, five pump flows were also compressed, and specific simulation parameters are shown in table 2. It can be seen that after the heat supply network is completely recovered, the energy consumption of the unit is further reduced, and the coal consumption is reduced by nearly 10 g/(kW.h)
TABLE 2
Based on the same inventive concept, the embodiment of the application also provides a coal-fired unit monitoring device based on zero output of the low-pressure cylinder, which can be used for realizing the method described in the embodiment, such as the following embodiment. Because the principle of solving the problem of the coal-fired unit monitoring device based on the low-pressure cylinder zero output is similar to that of the coal-fired unit monitoring method based on the low-pressure cylinder zero output, the implementation of the coal-fired unit monitoring device based on the low-pressure cylinder zero output can be implemented by referring to the coal-fired unit monitoring method based on the low-pressure cylinder zero output, and repeated parts are omitted. As used below, the term "unit" or "module" may be a combination of software and/or hardware that implements the intended function. While the system described in the following embodiments is preferably implemented in software, implementation in hardware, or a combination of software and hardware, is also possible and contemplated.
The embodiment of the invention provides a concrete implementation mode of a low-pressure cylinder zero-output-based coal-fired unit monitoring device capable of realizing a low-pressure cylinder zero-output-based coal-fired unit monitoring method, and referring to fig. 8, the low-pressure cylinder zero-output-based coal-fired unit monitoring device specifically comprises the following contents:
the pressure and temperature determining module 10 is used for determining the pressure and the temperature which are applied by the shaft seal of the coal-fired unit according to the vibration parameters of the high pressure cylinder and the medium pressure cylinder of the coal-fired unit under the working condition of zero output of the low pressure cylinder;
the water spray flow determining module 20 is used for determining the water spray flow of the low-pressure cylinder according to the final-stage exhaust steam temperature of the coal-fired unit under the working condition of zero output of the low-pressure cylinder;
the damage point determining module 30 is configured to determine a damage point of the low pressure cylinder nozzle according to the low pressure cylinder flow field under the low pressure cylinder zero-output working condition.
In one embodiment, referring to fig. 9, the pressure temperature determining module 10 includes:
a vibration parameter determining unit 101, configured to determine respective bearing bush vibration parameters of the high pressure cylinder and the medium pressure cylinder;
and the temperature and pressure determining unit 102 is used for determining the pressure and the temperature which the shaft seal should apply according to the vibration parameters of the bearing bush.
In one embodiment, referring to fig. 10, the low pressure cylinder zero output based coal-fired unit monitoring device further comprises:
the cooling flow rate determining module 40 is configured to determine a low pressure cylinder cooling flow rate according to the low pressure cylinder water spray flow rate.
In one embodiment, referring to fig. 11, the low pressure cylinder zero output based coal-fired unit monitoring device further comprises:
the low pressure cylinder flow field establishing module 50 is used for measuring the blade tip temperature of the low pressure cylinder in the water spraying process of the low pressure cylinder to establish the low pressure cylinder flow field.
In one embodiment, referring to fig. 12, the low pressure cylinder zero output based coal-fired unit monitoring device further comprises:
the grid establishing module 60 is used for establishing a limited-volume grid of the low-pressure cylinder circulation area under the working condition of zero output of the low-pressure cylinder;
a flow field establishing module 70, configured to establish a low pressure cylinder flow field according to the limited volume grid and the flow rate of the low pressure cylinder flow area;
and the construction mode optimizing module 80 is used for optimizing the low-pressure cylinder water spraying mode, the steam flow, the water spraying flow, the atomized water drop particle size and the movement track of the atomized water drops under the low-pressure cylinder zero-output working condition according to the low-pressure cylinder flow field.
As can be seen from the above description, the embodiment of the present invention provides a coal-fired unit monitoring device based on low pressure cylinder zero output, comprising: firstly, determining the pressure and the temperature which are applied by a shaft seal of a coal-fired unit according to vibration parameters of a high pressure cylinder and a medium pressure cylinder of the coal-fired unit under a low pressure cylinder zero-output working condition; then, determining the water spraying flow of the low-pressure cylinder according to the final-stage exhaust steam temperature of the coal-fired unit under the working condition of zero output of the low-pressure cylinder; and finally, determining the damage point of the low-pressure cylinder spray head through a low-pressure cylinder flow field under the working condition of zero output of the low-pressure cylinder. The invention provides a coal-fired unit monitoring method under the working condition of zero output of a low-pressure cylinder, which can enhance the safety and the operation economy of equipment of the coal-fired unit under the working condition of zero output of the low-pressure cylinder so as to ensure the peak shaving reliability of the unit.
The embodiment of the present application further provides a specific implementation manner of an electronic device, which can implement all the steps in the low-pressure cylinder zero-output-based coal-fired unit monitoring method in the foregoing embodiment, and referring to fig. 13, the electronic device specifically includes the following contents:
a processor 1201, a memory 1202, a communication interface (Communications Interface) 1203, and a bus 1204;
wherein the processor 1201, the memory 1202 and the communication interface 1203 perform communication with each other through the bus 1204; the communication interface 1203 is configured to implement information transmission between the server device and the client device;
the processor 1201 is configured to invoke a computer program in the memory 1202, and when the processor executes the computer program, the processor implements all the steps in the low pressure cylinder zero output based coal-fired unit monitoring method in the foregoing embodiment, for example, when the processor executes the computer program, the processor implements the following steps:
step 100: determining the pressure and the temperature which are applied by a shaft seal of the coal-fired unit according to vibration parameters of a high pressure cylinder and a medium pressure cylinder of the coal-fired unit under the working condition of zero output of the low pressure cylinder;
step 200: determining the water spraying flow of the low-pressure cylinder according to the final-stage exhaust steam temperature of the coal-fired unit under the working condition of zero output of the low-pressure cylinder;
step 300: and determining the damage point of the low-pressure cylinder spray head through the low-pressure cylinder flow field under the working condition of zero output of the low-pressure cylinder.
Embodiments of the present application further provide a computer readable storage medium capable of implementing all the steps in the low pressure cylinder zero-output-based coal-fired unit monitoring method in the above embodiments, and a computer program stored on the computer readable storage medium, where the computer program when executed by a processor implements all the steps in the low pressure cylinder zero-output-based coal-fired unit monitoring method in the above embodiments, for example, the processor implements the following steps when executing the computer program:
step 100: determining the pressure and the temperature which are applied by a shaft seal of the coal-fired unit according to vibration parameters of a high pressure cylinder and a medium pressure cylinder of the coal-fired unit under the working condition of zero output of the low pressure cylinder;
step 200: determining the water spraying flow of the low-pressure cylinder according to the final-stage exhaust steam temperature of the coal-fired unit under the working condition of zero output of the low-pressure cylinder;
step 300: and determining the damage point of the low-pressure cylinder spray head through the low-pressure cylinder flow field under the working condition of zero output of the low-pressure cylinder.
In this specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments. In particular, for a hardware+program class embodiment, the description is relatively simple, as it is substantially similar to the method embodiment, as relevant see the partial description of the method embodiment.
The preferred embodiments of the invention disclosed above are intended only to assist in the explanation of the invention. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise form disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best understand and utilize the invention. The invention is limited only by the claims and the full scope and equivalents thereof.
The foregoing describes specific embodiments of the present disclosure. Other embodiments are within the scope of the following claims. In some cases, the actions or steps recited in the claims can be performed in a different order than in the embodiments and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.
Although the present application provides method operational steps as an example or flowchart, more or fewer operational steps may be included based on conventional or non-inventive labor. The order of steps recited in the embodiments is merely one way of performing the order of steps and does not represent a unique order of execution. When implemented by an actual device or client product, the instructions may be executed sequentially or in parallel (e.g., in a parallel processor or multi-threaded processing environment) as shown in the embodiments or figures.
For convenience of description, the above devices are described as being functionally divided into various modules, respectively. Of course, when implementing the embodiments of the present disclosure, the functions of each module may be implemented in the same or multiple pieces of software and/or hardware, or a module that implements the same function may be implemented by multiple sub-modules or a combination of sub-units, or the like. The above-described apparatus embodiments are merely illustrative, for example, the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.
Those skilled in the art will also appreciate that, in addition to implementing the controller in a pure computer readable program code, it is well possible to implement the same functionality by logically programming the method steps such that the controller is in the form of logic gates, switches, application specific integrated circuits, programmable logic controllers, embedded microcontrollers, etc. Such a controller can be regarded as a hardware component, and means for implementing various functions included therein can also be regarded as a structure within the hardware component. Or even means for achieving the various functions may be regarded as either software modules implementing the methods or structures within hardware components.
In one typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
The memory may include volatile memory in a computer-readable medium, random Access Memory (RAM) and/or nonvolatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). Memory is an example of computer-readable media.
The present embodiments may be described in the general context of computer-executable instructions, such as program modules, being executed by a computer. Generally, program modules include routines, programs, objects, components, data structures, etc. that perform particular tasks or implement particular abstract data types. The embodiments of the specification may also be practiced in distributed computing environments where tasks are performed by remote processing devices that are linked through a communications network. In a distributed computing environment, program modules may be located in both local and remote computer storage media including memory storage devices.
In this specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments. In particular, for system embodiments, since they are substantially similar to method embodiments, the description is relatively simple, as relevant to see a section of the description of method embodiments. In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the embodiments of the present specification. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
The foregoing is merely an example of an embodiment of the present disclosure and is not intended to limit the embodiment of the present disclosure. Various modifications and variations of the illustrative embodiments will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, or the like, which is within the spirit and principles of the embodiments of the present specification, should be included in the scope of the claims of the embodiments of the present specification.
Claims (4)
1. The method for monitoring the coal-fired unit based on zero output of the low-pressure cylinder is characterized by comprising the following steps of:
determining the pressure and the temperature which are applied by a shaft seal of the coal-fired unit according to vibration parameters of a high pressure cylinder and a medium pressure cylinder of the coal-fired unit under the working condition of zero output of the low pressure cylinder;
determining the water spraying flow of the low-pressure cylinder according to the final-stage exhaust steam temperature of the coal-fired unit under the working condition of zero output of the low-pressure cylinder;
determining a damage point of a low-pressure cylinder spray head through a low-pressure cylinder flow field under the working condition of zero output of the low-pressure cylinder;
determining the cooling flow of the low-pressure cylinder according to the water spraying flow of the low-pressure cylinder;
measuring the temperature of the top of a blade of a low-pressure cylinder in the water spraying process of the low-pressure cylinder to establish a flow field of the low-pressure cylinder;
establishing a limited volume grid of a low-pressure cylinder circulation area under the working condition of zero output of the low-pressure cylinder;
establishing a low-pressure cylinder circulation flow field according to the flow of the limited volume grid and the low-pressure cylinder circulation area;
optimizing a low-pressure cylinder water spraying mode, steam flow, water spraying flow, atomized water drop particle size and movement track of the atomized water drops under the low-pressure cylinder zero-output working condition according to the low-pressure cylinder flow field;
the method for determining the pressure and the temperature to be applied by the shaft seal of the coal-fired unit according to the vibration parameters of the high pressure cylinder and the medium pressure cylinder of the coal-fired unit under the working condition of zero output of the low pressure cylinder comprises the following steps:
respectively determining respective bearing bush vibration parameters of the high-pressure cylinder and the medium-pressure cylinder;
and determining the pressure and the temperature which are applied by the shaft seal according to the vibration parameters of the bearing bush.
2. The utility model provides a coal-fired unit monitoring device based on low pressure jar zero output which characterized in that includes:
the pressure and temperature determining module is used for determining the pressure and the temperature which are required to be applied by the shaft seal of the coal-fired unit according to the vibration parameters of the high pressure cylinder and the medium pressure cylinder of the coal-fired unit under the working condition of zero output of the low pressure cylinder;
the water spray flow determining module is used for determining the water spray flow of the low-pressure cylinder according to the final-stage exhaust steam temperature of the coal-fired unit under the working condition of zero output of the low-pressure cylinder;
the damage point determining module is used for determining damage points of the low-pressure cylinder spray heads through a low-pressure cylinder flow field under the working condition of zero output of the low-pressure cylinder;
the cooling flow determining module is used for determining the cooling flow of the low-pressure cylinder according to the water spraying flow of the low-pressure cylinder;
the low-pressure cylinder flow field establishing module is used for measuring the temperature of the top of the blade of the low-pressure cylinder in the water spraying process of the low-pressure cylinder to establish the low-pressure cylinder flow field;
the grid establishing module is used for establishing a limited-volume grid of the low-pressure cylinder circulation area under the working condition of zero output of the low-pressure cylinder;
the flow field establishing module is used for establishing a low-pressure cylinder flow field according to the limited volume grid and the flow of the low-pressure cylinder flow area;
the construction mode optimizing module is used for optimizing a low-pressure cylinder water spraying mode, steam flow, water spraying flow, atomized water drop particle size and movement track of atomized water drops under the low-pressure cylinder zero-output working condition according to the low-pressure cylinder flow field;
the pressure temperature determination module includes:
the vibration parameter determining unit is used for determining the vibration parameters of the bearing bushes of the high-pressure cylinder and the medium-pressure cylinder respectively;
and the temperature and pressure determining unit is used for determining the pressure and the temperature which the shaft seal should apply according to the vibration parameters of the bearing bush.
3. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor, when executing the program, performs the steps of the low pressure cylinder zero output based coal burning unit monitoring method of claim 1.
4. A computer readable storage medium having stored thereon a computer program, which when executed by a processor, implements the steps of the low pressure cylinder zero output based coal burning unit monitoring method of claim 1.
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