CN114719191B - Pipeline preheating method, system and controller - Google Patents
Pipeline preheating method, system and controller Download PDFInfo
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- CN114719191B CN114719191B CN202210289263.3A CN202210289263A CN114719191B CN 114719191 B CN114719191 B CN 114719191B CN 202210289263 A CN202210289263 A CN 202210289263A CN 114719191 B CN114719191 B CN 114719191B
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- induced draft
- draft fan
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- 238000010438 heat treatment Methods 0.000 claims abstract description 103
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- 238000004590 computer program Methods 0.000 claims description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 238000000605 extraction Methods 0.000 claims description 10
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 7
- 239000003546 flue gas Substances 0.000 claims description 7
- 239000003245 coal Substances 0.000 claims description 6
- 230000002209 hydrophobic effect Effects 0.000 claims description 6
- 238000009423 ventilation Methods 0.000 claims description 5
- 239000000428 dust Substances 0.000 claims description 4
- 230000001960 triggered effect Effects 0.000 claims description 3
- 238000010792 warming Methods 0.000 claims description 2
- 238000012802 pre-warming Methods 0.000 claims 2
- 238000002485 combustion reaction Methods 0.000 abstract description 9
- 238000003912 environmental pollution Methods 0.000 abstract description 8
- 239000002699 waste material Substances 0.000 abstract description 8
- 238000003860 storage Methods 0.000 description 13
- 238000010586 diagram Methods 0.000 description 12
- 238000011010 flushing procedure Methods 0.000 description 7
- 230000006870 function Effects 0.000 description 6
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- 238000005516 engineering process Methods 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 239000002817 coal dust Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/02—Pipe-line systems for gases or vapours
- F17D1/06—Pipe-line systems for gases or vapours for steam
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
-
- 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
- F23L15/04—Arrangements of recuperators
-
- 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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Control Of Turbines (AREA)
Abstract
The embodiment of the invention provides a pipeline preheating method, a pipeline preheating system and a pipeline preheating controller, wherein the method comprises the following steps: controlling to start a newly-added fan, a first control valve and a pre-heating control valve group, and closing a steam inlet control valve group; a second control valve of the auxiliary steam pipeline is controlled to be opened, so that auxiliary steam enters the pipeline, and steam parameters of a draught fan steam turbine set are obtained; when the steam parameters meet the preset pre-heating conditions, closing the pre-heating control valve group, stopping the newly-added fan, and completing pipeline pre-heating. The invention can shorten the preheating time of the pipeline, avoid energy waste, reduce noise and environmental pollution, and improve the combustion efficiency of the boiler; meanwhile, the whole-course automation of the pipeline preheating process can be realized, errors possibly caused by manual operation are reduced, and the accurate judgment and control of the preheating process are realized.
Description
Technical Field
The invention relates to the technical field of preheating, in particular to a pipeline preheating method, a pipeline preheating system and a pipeline preheating controller.
Background
In recent years, along with the urgent and urgent clean and efficient utilization of coal-fired power plants, more and more power plants begin to improve the energy utilization rate of the coal-fired power plants further by energy-saving transformation or applying new technologies, so as to reduce the emission of carbon dioxide and other pollutants. At present, more and more power plants start to adopt a steam-driven induced draft fan, so that the power utilization rate of the power plants can be greatly reduced, the power supply coal consumption is reduced, and the influence of starting current on the power utilization system when a large motor is started is thoroughly eliminated. Because the heating pipe is difficult before the induced draft fan steam turbine starts, the heating pipe time is longer, the starting and load plan of the unit are seriously influenced, in the related art, in order to shorten the pipeline preheating time, a large-diameter drainage pipeline is added at the steam inlet pipeline of the far-end induced draft fan steam turbine, and the pipeline preheating time can be shortened, but the steam is often discharged to the atmosphere, so that huge energy waste is caused, and the problems of noise, environmental pollution and the like are also caused.
Disclosure of Invention
The invention aims to provide a pipeline preheating method, which can shorten the pipeline preheating time, avoid energy waste, reduce noise and environmental pollution and improve the combustion efficiency of a boiler. It is another object of the present invention to provide a duct preheating system. It is a further object of the present invention to provide a controller. It is yet another object of the present invention to provide a computer readable medium. It is a further object of the invention to provide a computer device.
To achieve the above object, one aspect of the present invention discloses a pipe preheating method, including:
the newly added fan, the first control valve and the pre-heating control valve group are controlled to be started;
a second control valve of the auxiliary steam pipeline is controlled to be opened, so that auxiliary steam enters the pipeline, and steam parameters of a draught fan steam turbine set are obtained;
if the steam parameters meet the preset pre-heating conditions, closing the pre-heating control valve group, and completing pipeline pre-heating.
Preferably, the second control valve controlling the auxiliary steam pipe is opened so that the auxiliary steam enters the pipe, comprising:
and controlling the second control valve to be opened according to the set opening threshold according to the specified time period, so that auxiliary steam starts to enter the pipeline until the second control valve is completely opened.
Preferably, the steam parameters comprise temperature parameters and pressure parameters, and the pre-heating condition is that the temperature parameters are larger than the sum of the queried saturated steam temperature and a preset temperature threshold;
before closing the pre-heating control valve group if the steam parameter meets the preset pre-heating condition, the method further comprises:
inquiring the corresponding saturated steam temperature from a preset saturated steam temperature corresponding table according to the pressure parameter;
if the temperature parameter is greater than the sum of the queried saturated steam temperature and a preset temperature threshold value, the steam parameter meets a preset condition, and continuing to execute the step of closing the pre-heating control valve group;
if the temperature parameter is smaller than or equal to the sum of the queried saturated steam temperature and the preset temperature threshold value, the steam parameter does not meet the preset condition, and the step of obtaining the steam parameter of the induced draft fan steam turbine set is continuously executed until the steam parameter meets the preset pre-heating condition.
Preferably, the induced draft fan turbine unit comprises a first induced draft fan turbine and a second induced draft fan turbine;
obtaining steam parameters of a draught fan steam turbine unit, comprising:
the method comprises the steps of obtaining a first temperature parameter and a first pressure parameter of a first induced draft fan turbine, and obtaining a second temperature parameter and a second pressure parameter of a second induced draft fan turbine.
Preferably, the pre-heating condition is that the first temperature parameter is larger than the sum of the queried first saturated steam temperature and a preset first temperature threshold value, and the second temperature parameter is larger than the sum of the queried second saturated steam temperature and a preset second temperature threshold value; the pre-heating control valve group comprises a third control valve between the air heater and the auxiliary steam pipeline, a fourth control valve between the air heater and the auxiliary steam pipeline and a fifth control valve between the air heater and the induced draft fan steam turbine condenser, wherein the third control valve corresponds to the first induced draft fan steam turbine, and the fourth control valve corresponds to the second induced draft fan steam turbine;
if the steam parameter meets the preset pre-heating condition, closing the pre-heating control valve group, wherein the pre-heating control valve group comprises:
if the first temperature parameter is greater than the sum of the queried first saturated steam temperature and a preset first temperature threshold value, closing a third control valve;
if the second temperature parameter is greater than the sum of the queried second saturated steam temperature and a preset second temperature threshold value, closing a fourth control valve;
and if the first temperature parameter is greater than the sum of the queried first saturated steam temperature and the preset first temperature threshold value and the second temperature parameter is greater than the sum of the queried second saturated steam temperature and the preset second temperature threshold value, closing the fifth control valve.
Preferably, after closing the pre-heating control valve group, the method further comprises:
and closing the first control valve and the newly added fan.
Preferably, before the second control valve controlling the auxiliary steam pipe is opened, the method further comprises:
and controlling a steam inlet control valve group between the induced draft fan steam turbine unit and the auxiliary steam pipeline to be closed.
The invention also discloses a system, which comprises: the system comprises a controller, a newly-added fan, a pre-heating control valve group, a second control valve and an induced draft fan turbine group;
the controller is used for controlling the starting of the newly-added fan, the first control valve and the pre-heating control valve group; a second control valve of the auxiliary steam pipeline is controlled to be opened, so that auxiliary steam enters the pipeline, and steam parameters of a draught fan steam turbine set are obtained; if the steam parameters meet the preset pre-heating conditions, closing the pre-heating control valve group, and completing pipeline pre-heating.
The invention also discloses a controller, which comprises:
the starting unit is used for controlling and starting the newly-increased fan, the first control valve and the pre-heating control valve group;
the acquisition unit is used for controlling the second control valve of the auxiliary steam pipeline to be opened so that auxiliary steam enters the pipeline and acquiring steam parameters of the induced draft fan steam turbine unit;
and the closing unit is used for closing the preheating control valve group and completing pipeline preheating if the steam parameters meet the preset preheating conditions.
The invention also discloses a computer readable medium having stored thereon a computer program which when executed by a processor implements a method as described above.
The invention also discloses a computer device comprising a memory for storing information comprising program instructions and a processor for controlling the execution of the program instructions, the processor implementing the method as described above when executing the program.
The invention also discloses a computer product comprising a computer program/instruction which, when executed by a processor, implements a method as described above.
The invention controls the starting of the newly added fan, the first control valve and the pre-heating control valve group; a second control valve of the auxiliary steam pipeline is controlled to be opened, so that auxiliary steam enters the pipeline, and steam parameters of a draught fan steam turbine set are obtained; if the steam parameters meet the preset preheating conditions, the preheating control valve group is closed, the pipeline preheating is completed, the pipeline preheating time can be shortened, the energy waste is avoided, the noise and environmental pollution problems are reduced, and the boiler combustion efficiency is improved.
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 pipeline preheating system according to an embodiment of the present invention;
FIG. 2 is a flow chart of a method for preheating a pipeline according to an embodiment of the present invention;
FIG. 3 is a flow chart of yet another method for preheating a pipeline according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a controller according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a computer device according to an embodiment of the present invention.
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.
In order to facilitate understanding of the technical solutions provided in the present application, the following description will first explain relevant content of the technical solutions of the present application. The driving steam source of the steam induced draft fan steam turbine comprises two paths of four sections of steam extraction and auxiliary steam of the steam turbine, the unit load is low in the initial period of unit grid connection, the four sections of steam extraction parameters of the induced draft fan steam turbine are low, the auxiliary steam is generally used as a steam source to perform flushing rotation on the induced draft fan steam turbine, and the load of the standby unit is increased to a certain value and then is switched to the four sections of steam extraction. However, the auxiliary steam header is usually arranged in a steam turbine room, the induced draft fan steam turbine is usually arranged in an induced draft fan steam turbine room, the distance between the auxiliary steam header and the induced draft fan steam turbine is long, and the auxiliary steam is often 800-1000 m and even longer; although multipath drainage points are also arranged along the steam inlet pipeline from the auxiliary steam to the induced draft fan steam turbine, the pipe diameter of the drainage pipeline is thinner, so that a heating pipe is difficult before the induced draft fan steam turbine is started, the heating pipe time is longer, the steam parameters before the main steam valve of the induced draft fan steam turbine cannot reach the flushing parameters later, and the starting and load-carrying planning of a unit are seriously influenced.
In order to solve the technical problems, taking an application scene of a driving steam source of a steam induced draft fan steam turbine as an example, the invention provides a pipeline preheating method suitable for the driving steam source of the steam induced draft fan steam turbine. It is worth to be noted that, the technical scheme of pipeline preheating provided by the embodiment of the invention can also be suitable for pipeline preheating in other scenes, and in other scenes, each part in the pipeline preheating system can be properly adjusted according to the actual scene.
Fig. 1 is a schematic structural diagram of a pipeline preheating system according to an embodiment of the present invention, as shown in fig. 1, the system includes: the system comprises a controller 110, a newly-added fan 120, a pre-heating control valve group, a first control valve 140, a second control valve 131, an induced draft fan turbine group, a check valve 160, a steam inlet control valve group, an air pre-heater 180, a primary fan 190, a heater 200 and an induced draft fan turbine condenser 210. The first control valve 140 is disposed between the heater 200 and the air preheater 180, and is used for controlling the heated cold air and the cold air pressurized by the primary air blower 190 to be combined and enter the air preheater 180.
The controller 110 is used to control the operation of the overall duct preheating system, as shown in fig. 1, with the control of the various components by the controller 110 being shown in phantom. Specifically, the controller 110 is configured to control starting the fresh air ventilator 120, the first control valve 140, and the pre-heating control valve group; the second control valve 131 for controlling the auxiliary steam pipeline is opened, so that auxiliary steam enters the pipeline and steam parameters of the induced draft fan steam turbine set are obtained; if the steam parameters meet the preset pre-heating conditions, closing the pre-heating control valve group, and completing pipeline pre-heating. Wherein the second control valve 131 is used for controlling the circulation of auxiliary steam in the auxiliary steam pipeline; the preheating control valve group comprises a plurality of control valves which are respectively arranged on different pipelines in the pipeline preheating system and used for controlling the flow direction of steam in the pipeline.
It should be noted that, the opening and closing actions of the first control valve 140 and the additional fan are strictly synchronous, the additional fan is started and the first control valve 140 is opened at the same time, and when the additional fan is to be stopped, the controller 110 sends a closing instruction to the first control valve 140 and simultaneously stops the additional fan 120.
As an alternative, the second control valve 131 is an adjustable gate valve. Each control valve of the second control valve 131 and the pre-heating control valve group is connected with the controller 110 through a control signal line, respectively.
In the embodiment of the present invention, the pre-heating control valve group includes a third control valve 132, a fourth control valve 133 and a fifth control valve 134. The third control valve 132 is disposed between the heater 200 and the auxiliary steam pipe, and is used for controlling steam to flow to the heater 200 along a branch pipe; the fourth control valve 133 is disposed between the heater 200 and the auxiliary steam pipe, and is used for controlling steam to flow to the heater 200 along another branch pipe, and the fifth control valve 134 is disposed between the heater 200 and the induced draft fan turbine condenser 210, and is used for controlling the flow of the drain water released by the heater 200 to the induced draft fan turbine condenser 210.
As an alternative, the first control valve 140 is an adjustable butterfly valve; the third control valve 132, the fourth control valve 133 and the fifth control valve 134 are adjustable gate valves.
In the embodiment of the present invention, the induced draft fan turbine unit includes a first induced draft fan turbine 151 and a second induced draft fan turbine 152. As shown in fig. 1, the third control valve 132 corresponds to the first induced draft fan turbine 151, and the fourth control valve 133 corresponds to the second induced draft fan turbine 152.
In the embodiment of the invention, the steam inlet control valve group comprises a sixth control valve 171 and a seventh control valve 172. As shown in fig. 1, the sixth control valve 171 corresponds to the first induced draft fan turbine 151, is disposed between the first induced draft fan turbine 151 and the auxiliary steam pipe and is close to the first induced draft fan turbine 151; the seventh control valve 172 corresponds to the second induced draft fan turbine 152, and is disposed between the second induced draft fan turbine 152 and the auxiliary steam pipe and close to the second induced draft fan turbine 152. Each control valve in the steam inlet control valve group is connected with the controller 110 through a control signal line.
As an alternative, the sixth control valve 171 and the seventh control valve 172 are adjustable gate valves.
As shown in fig. 1, the four sections of steam extraction pipelines and the auxiliary steam pipelines are respectively converged into one steam pipeline after passing through the check valve 160 and the second control valve 131, and then flow continuously along the steam pipeline after being converged, and flow to the induced draft fan turbine set to be divided into two paths, wherein one path enters the first induced draft fan turbine 151 after passing through the sixth control valve 171, and the other path enters the second induced draft fan turbine 152 after passing through the seventh control valve 172; the exhaust steam after working in the first induced draft fan turbine 151 and the second induced draft fan turbine 152 is converged and then enters the induced draft fan turbine condenser 210, and then is converged with the drainage conveyed by the heater 200 and then enters the main machine condenser. The main steam of the first induced draft fan steam turbine 151 and the second induced draft fan steam turbine 152 is led out of a pipeline for drainage respectively in front of a sixth control valve 171 and a seventh control valve 172, the pipe diameters of two branch pipelines are the same as the pipe diameter of the main pipeline, so that the ventilation quantity of the steam is increased in the process of starting pipeline preheating, a third control valve 132 and a fourth control valve 133 are respectively arranged on the two branch pipelines, the steam is conveyed and converged into a pipeline along the two branch pipelines, the pipeline is connected with an inlet of a heater 200, and the inlet of the heater 200 is used for receiving the steam or hot water conveyed by the pipeline; the steam or hot water released from the heat in the heater 200 becomes hydrophobic, passes through the fifth control valve 134, and then is introduced into the hot well of the induced draft fan turbine condenser 210. The cold air pressurized by the newly added fan 120 is sent into the air heater 200, heated in the air heater 200, passes through the first control valve 140, and is converged with the cold air pressurized by the primary fan 190 to enter the air preheater 180; heated to a hot primary air in the air preheater 180 and then sent to a coal mill; the flue gas discharged from the boiler is sent to the air preheater 180, and is discharged in the air preheater 180 to be sent to the dust remover.
In the embodiment of the invention, the steam turbines for providing four sections of extraction steam and the auxiliary steam header for providing auxiliary steam are both positioned in the steam turbine room, the first induced draft fan steam turbine 151 and the second induced draft fan steam turbine 152 are positioned in the induced draft fan room, and optionally, the length of a steam pipeline between the steam turbine room and the induced draft fan room is between 800 meters (m) and 1000 meters (m).
In the technical scheme provided by the embodiment of the invention, the newly added fan, the first control valve and the pre-heating control valve group are controlled to be started; a second control valve of the auxiliary steam pipeline is controlled to be opened, so that auxiliary steam enters the pipeline, and steam parameters of a draught fan steam turbine set are obtained; if the steam parameters meet the preset preheating conditions, the preheating control valve group is closed, the pipeline preheating is completed, the pipeline preheating time can be shortened, the energy waste is avoided, the noise and environmental pollution problems are reduced, and the boiler combustion efficiency is improved.
It should be noted that the pipeline preheating system shown in fig. 1 is also applicable to the pipeline preheating method in fig. 2 or fig. 3, and will not be described herein.
The implementation process of the pipeline preheating method provided by the embodiment of the invention is described below by taking a controller as an execution main body as an example. It can be appreciated that the execution body of the pipeline preheating method provided by the embodiment of the invention includes, but is not limited to, a controller.
Fig. 2 is a flowchart of a method for preheating a pipeline according to an embodiment of the present invention, as shown in fig. 2, where the method includes:
and 101, controlling and starting a newly-increased fan, a first control valve and a pre-heating control valve group.
Step 102, controlling a second control valve of the auxiliary steam pipeline to be opened, enabling auxiliary steam to enter the pipeline, and obtaining steam parameters of the induced draft fan steam turbine unit.
And 103, if the steam parameters meet the preset pre-heating conditions, closing the pre-heating control valve group, and completing pipeline pre-heating.
In the technical scheme of the pipeline preheating method provided by the embodiment of the invention, the newly-added fan, the first control valve and the preheating control valve group are controlled to be started; a second control valve of the auxiliary steam pipeline is controlled to be opened, so that auxiliary steam enters the pipeline, and steam parameters of a draught fan steam turbine set are obtained; when the steam parameters meet the preset pre-heating conditions, closing the pre-heating control valve group, and completing pipeline pre-heating. The invention can shorten the preheating time of the pipeline, reduce the problems of noise and environmental pollution, simultaneously recover the hydrophobic heat in the preheating process to the primary air of the boiler, avoid energy waste, improve the temperature of the primary air of the boiler to a certain extent, reduce the ignition heat of coal dust, lead the ignition position to move forward, and improve the combustion efficiency of the boiler. In addition, the whole-course automation of the preheating process of the steam inlet pipeline of the induced draft fan steam turbine can be realized by using the technical scheme, the errors possibly brought by manual operation of operators are reduced, and the accurate judgment and control of the preheating process are realized.
Fig. 3 is a flowchart of a method for preheating a pipeline according to an embodiment of the present invention, as shown in fig. 3, where the method includes:
step 201, controlling and starting a newly-increased fan, a first control valve and a pre-heating control valve group.
In the embodiment of the invention, each step is executed by a controller.
As an alternative, the controller may control the start of the additional fan, the first control valve and the pre-heating control valve group by means of a start signal. The pre-heating control valve group comprises a third control valve arranged between the air heater and the auxiliary steam pipeline, a fourth control valve arranged between the air heater and the auxiliary steam pipeline and a fifth control valve arranged between the air heater and the induced draft fan steam turbine condenser. The first control valve is used for controlling the heated cold air and the cold air pressurized by the primary air blower to be converged and enter the air preheater; the third control valve is used for controlling steam to flow to the heater along one branch pipeline; the fourth control valve is used for controlling steam to flow to the heater along the other branch pipeline; and the fifth control valve is used for controlling the flow of the drain water released by the heater to the condenser of the induced draft fan steam turbine.
It is worth to say that the opening actions of the first control valve and the newly added fan are strictly synchronous actions, and the first control valve is opened while the newly added fan is started; the opening sequence of the first control valve and the pre-heating control valve group is not limited.
As an alternative, the first control valve is an adjustable butterfly valve; the third control valve, the fourth control valve and the fifth control valve are adjustable gate valves.
Further, a steam inlet control valve group between the induced draft fan steam turbine unit and the auxiliary steam pipeline is controlled to be closed, so that cold steam or water is prevented from entering the induced draft fan steam turbine unit in the initial starting stage.
In the embodiment of the invention, because the four-section steam extraction parameters are lower in the initial starting stage, auxiliary steam is required to be used as a starting steam source for flushing and turning the induced draft fan steam turbine unit, and the pipeline of the induced draft fan steam turbine unit is required to be preheated before flushing and turning, a newly added fan and a preheating control valve bank are started, and the working medium circulation on the air side of the heater is established; and starting other drainage along the pipeline of the induced draft fan turbine unit, so that preparation is made for driving steam to be discharged by the induced draft fan turbine in the initial cooling process.
Step 202, a second control valve controlling the auxiliary steam pipeline is opened, so that auxiliary steam enters the pipeline.
Specifically, according to a specified time period, the second control valve is controlled to be opened according to a set opening threshold value, so that auxiliary steam starts to enter the pipeline until the second control valve is completely opened. It should be noted that, the specific time period may be set according to the actual situation, and the specific value of the time period in the embodiment of the present invention is not limited. As an alternative, the specified time period is 10 minutes; the opening threshold value can be set according to actual conditions, and the specific value of the opening threshold value is not limited in the embodiment of the invention. As an alternative, the opening threshold is 10%.
In the embodiment of the invention, after the circulation of the working medium at the air side of the heater is established, the second control valve is controlled to be opened to a valve position of 10%, so that auxiliary steam starts to be introduced into the steam inlet pipeline of the induced draft fan turbine unit at a small flow rate, the pipeline starts to be preheated, and hot water generated by cooling the steam is discharged into the induced draft fan turbine condenser after passing through the heater. After the steam inlet pipeline of the induced draft fan turbine unit is preheated for 10 minutes by the small flow, the temperature of the pipeline is gradually increased, the second control valve is continuously opened, the opening of the second control valve is increased by 10% on the basis of the original opening, the preheating steam flow is increased, and the process is repeated until the second control valve is opened to 100%.
Further, staff monitors the pipeline vibration condition of draught fan steam turbine unit, if pipeline vibration amplitude is great, in order to guarantee safety, need stop the work of warming up in advance.
And 203, acquiring steam parameters of the induced draft fan steam turbine unit.
In the embodiment of the invention, the induced draft fan turbine unit comprises a first induced draft fan turbine and a second induced draft fan turbine. The steam parameters include temperature parameters and pressure parameters.
Specifically, a first temperature parameter t of a first induced draft fan turbine is obtained 1 And a first pressure parameter p 1 And obtaining a second temperature parameter t of the second induced draft fan steam turbine 2 And a second pressure parameter p 2 。
Step 204, judging whether the steam parameters meet preset pre-heating conditions, if yes, executing step 205; if not, go to step 203.
In the embodiment of the invention, the steam parameters comprise a temperature parameter and a pressure parameter, and the pre-heating condition is that the temperature parameter is larger than the sum of the queried saturated steam temperature and a preset temperature threshold value. It should be noted that, the steam parameters may also include other parameters, and the corresponding pre-heating conditions may be set according to actual situations, and the embodiment of the present invention does not limit the specific settings of the parameter types and the pre-heating conditions; the temperature threshold may be set according to practical situations, and the specific value of the temperature threshold is not limited in the embodiment of the present invention, and as an alternative, the temperature threshold is 50 degrees celsius (°c).
In the embodiment of the invention, a saturated steam temperature corresponding table is preset, and the saturated steam temperature corresponding table comprises a corresponding relation between steam pressure and saturated steam temperature.
Specifically, inquiring the corresponding saturated steam temperature from a preset saturated steam temperature corresponding table according to the pressure parameter; if the temperature parameter is greater than the sum of the queried saturated steam temperature and the preset temperature threshold, indicating that the steam parameter meets the preset condition, continuing to execute step 205; if the temperature parameter is less than or equal to the sum of the queried saturated steam temperature and the preset temperature threshold, indicating that the steam parameter does not meet the preset condition, continuing to execute step 203 until the steam parameter meets the preset pre-heating condition.
The induced draft fan turbine unit includes first induced draft fan turbine and second induced draft fan turbine for example, and steam parameter includes temperature parameter and pressure parameter, and the pre-warm condition is that first temperature parameter is greater than the sum of first saturated steam temperature of inquiry and preset first temperature threshold value, and second temperature parameter is greater than the sum of second saturated steam temperature of inquiry and preset second temperature threshold value, and the temperature threshold value is 50 ℃, then judges whether first temperature parameter is greater than the sum of first saturated steam temperature of inquiry and preset first temperature threshold value, namely: t is t 1 ＞f(p 1 ) +50℃, where t 1 For the first temperature parameter, p 1 For the first pressure parameter, f (p 1 ) For the queried first saturated steam temperature, and judging whether the second temperature parameter is greater than the sum of the queried second saturated steam temperature and a preset second temperature threshold value, namely: t is t 2 ＞f(p 2 ) +50℃, where t 2 For the second temperature parameter, p 2 Is the second pressure parameter, f (p 2 ) The second saturated steam temperature is inquired; if the first temperature parameter is greater than the sum of the queried first saturated steam temperature and the preset first temperature threshold and the second temperature parameter is greater than the sum of the queried second saturated steam temperature and the preset second temperature threshold, indicating that the steam parameter meets the preset condition, continuing to execute step 205; if the first temperature parameter is less than or equal to the sum of the queried first saturated steam temperature and the preset first temperature threshold or the second temperature parameter is less than or equal to the sum of the queried second saturated steam temperature and the preset second temperature threshold, the steam parameter does not meet the preset condition, and the step 203 is continuously executed until the steam parameter meets the preset pre-heating condition.
And 205, closing the preheating control valve group, and completing pipeline preheating.
Specifically, if the first temperature parameter is greater than the sum of the queried first saturated steam temperature and a preset first temperature threshold value, a third control valve in the pre-heating control valve group is closed.
In the embodiment of the invention, after the second control valve is opened to 100%,the steam inlet pipeline of the first induced draft fan steam turbine is preheated continuously at a high flow rate, at the moment, the air heater is used as a user of auxiliary steam, and the pipe diameters of the pipeline before and after the third control valve are the same as the pipe diameters of the pipeline before and after the sixth control valve, so that the steam flow rate of the auxiliary steam before the first induced draft fan steam turbine is large, and the steam inlet pipeline can be preheated fully and effectively; when t 1 ＞f(p 1 ) At +50℃, namely: when the superheat degree of the steam before the first induced draft fan steam turbine is greater than 50 ℃, the preheating of the steam inlet pipeline of the first induced draft fan steam turbine is finished, and the third control valve is closed.
Specifically, if the second temperature parameter is greater than the sum of the queried second saturated steam temperature and the preset second temperature threshold value, a fourth control valve in the pre-heating control valve group is closed.
In the embodiment of the invention, after the second control valve is opened to 100%, the steam inlet pipeline of the second induced draft fan steam turbine is preheated continuously at a high flow rate, at the moment, the air heater is used as a user of auxiliary steam, and the pipe diameters of the pipeline before and after the fourth control valve are the same as the pipe diameters of the pipeline before and after the seventh control valve, so that the steam flow rate before the auxiliary steam reaches the second induced draft fan steam turbine is large, and the steam inlet pipeline can be preheated sufficiently and effectively; when t 2 ＞f(p 2 ) At +50℃, namely: and when the superheat degree of the steam before the second induced draft fan steam turbine is greater than 50 ℃, the preheating of the steam inlet pipeline of the second induced draft fan steam turbine is finished, and the fourth control valve is closed.
Specifically, if the first temperature parameter is greater than the sum of the queried first saturated steam temperature and the preset first temperature threshold value and the second temperature parameter is greater than the sum of the queried second saturated steam temperature and the preset second temperature threshold value, closing a fifth control valve in the pre-heating control valve group.
In the embodiment of the invention, when t 1 ＞f(p 1 ) +50 ℃ and t 2 ＞f(p 2 ) At +50℃, namely: and after the steam inlet pipelines of the first induced draft fan steam turbine and the second induced draft fan steam turbine are preheated, closing the fifth control valve.
Further, the newly added fan and the first control valve are closed, cold primary air at the inlet of the air preheater is provided by the primary fan only after the newly added fan and the first control valve are closed, other drainage is carried out along the steam pipelines of the first induced draft fan steam turbine and the second induced draft fan steam turbine are closed, the preheating work is completed, and the starting work of the first induced draft fan steam turbine and the second induced draft fan steam turbine can be continued subsequently. It is worth to say that the closing actions of the first control valve and the newly added fan are strictly synchronous actions, and when the newly added fan is stopped, the controller sends a closing instruction to the first control valve, and meanwhile, the newly added fan is stopped.
The following describes the application of the pipeline preheating method in a specific embodiment:
after the unit is started and connected, preparing for the flushing of the induced draft fan turbine, wherein at the moment, four sections of steam extraction parameters (pressure and temperature) are still lower, auxiliary steam is required to be adopted as a starting steam source for flushing the induced draft fan turbine, and the pipeline of the induced draft fan turbine unit is required to be preheated before flushing; at the moment, a newly-added fan, a first control valve and a pre-heating control valve bank are started, and a steam inlet control valve bank between the induced draft fan steam turbine set and an auxiliary steam pipeline is controlled to be closed; according to a specified time period, the second control valve is controlled to be opened according to a set opening threshold value, so that auxiliary steam starts to enter the pipeline until the second control valve is completely opened, and at the moment, the heat of the auxiliary steam to the pre-heating steam of the steam inlet pipeline of the induced draft fan steam turbine can be recovered into primary air at the inlet of the air pre-heater through the heater; in the opening process of the second control valve, acquiring a first temperature parameter t of the first induced draft fan turbine 1 And a first pressure parameter p 1 And obtaining a second temperature parameter t of the second induced draft fan steam turbine 2 And a second pressure parameter p 2 The method comprises the steps of carrying out a first treatment on the surface of the When t 1 ＞f(p 1 ) At +50 ℃, the preheating of the steam inlet pipeline of the turbine of the first induced draft fan is finished, and at the moment, the third control valve is closed; when t 2 ＞f(p 2 ) When the temperature is +50 ℃, preheating of the steam inlet pipeline of the second induced draft fan steam turbine is completed, and at the moment, closing the fourth control valve; when t 1 ＞f(p 1 ) +50 ℃ and t 2 ＞f(p 2 ) And when the temperature is +50 ℃, closing a fifth control valve, closing the newly-increased fan and the first control valve, and preheating steam inlet pipelines of the two induced draft fans and the steam turbines.
According to the technical scheme of the pipeline preheating method, the ventilation quantity from auxiliary steam to starting steam of the induced draft fan steam turbine in the heating pipe process can be increased, the preheating time of the induced draft fan steam turbine steam inlet pipeline is effectively shortened, meanwhile, the heat drained in the induced draft fan steam turbine steam inlet pipeline preheating process can be recovered into the primary air of the boiler through the air heater, the temperature of the primary air of the boiler is improved to a certain extent, the ignition heat of pulverized coal can be reduced, the ignition position is moved forwards, and the combustion efficiency of the boiler is improved. In addition, the technical scheme of the pipeline preheating method provided by the embodiment of the invention can also realize the whole-course automation of the preheating process of the steam inlet pipeline of the induced draft fan steam turbine, reduce errors possibly caused by manual operation of operators and realize the accurate judgment and control of the preheating process. The technical scheme of the invention is applied to a typical 1000MW supercritical coal-fired unit provided with two steam induced fans, the preheating time of the steam inlet pipeline of the steam turbine of the induced fans can be shortened from 7-8 hours to about 2 hours, meanwhile, the heat drained in the preheating process can be recovered to about 38.7GJ, and the combustion efficiency of the boiler can be effectively improved by recovering part of the heat into primary air.
In the technical scheme of the pipeline preheating method provided by the embodiment of the invention, the newly-added fan, the first control valve and the preheating control valve group are controlled to be started; a second control valve of the auxiliary steam pipeline is controlled to be opened, so that auxiliary steam enters the pipeline, and steam parameters of a draught fan steam turbine set are obtained; if the steam parameters meet the preset preheating conditions, the preheating control valve group is closed, the pipeline preheating is completed, the pipeline preheating time can be shortened, the energy waste is avoided, the noise and environmental pollution problems are reduced, and the boiler combustion efficiency is improved.
Fig. 4 is a schematic structural diagram of a controller according to an embodiment of the present invention, where the controller is configured to perform the above-mentioned pipeline preheating method, as shown in fig. 4, and the controller includes: a start-up unit 11, an acquisition unit 12 and a shut-down unit 13.
The starting unit 11 is used for controlling and starting the newly-increased fan, the first control valve and the pre-heating control valve group.
The obtaining unit 12 is configured to control the second control valve of the auxiliary steam pipe to be opened, so that auxiliary steam enters the pipe, and obtain the steam parameters of the induced draft fan turbine set.
The closing unit 13 is configured to close the preheating control valve set if the steam parameter meets a preset preheating condition, and the pipeline preheating is completed.
In the embodiment of the present invention, the obtaining unit 12 is specifically configured to control the second control valve to be opened according to the set opening threshold according to the specified time period, so that the auxiliary steam starts to enter the pipeline until the second control valve is completely opened.
In the embodiment of the invention, the steam parameters comprise temperature parameters and pressure parameters, and the pre-heating condition is that the temperature parameters are larger than the sum of the queried saturated steam temperature and a preset temperature threshold; the apparatus further comprises:
the inquiring unit 14 is configured to inquire a corresponding saturated steam temperature from a preset saturated steam temperature corresponding table according to the pressure parameter; if the temperature parameter is greater than the sum of the queried saturated steam temperature and the preset temperature threshold, the steam parameter meets the preset condition, and the closing unit 13 is triggered to continuously execute the step of closing the pre-heating control valve group. If the temperature parameter is less than or equal to the sum of the queried saturated steam temperature and the preset temperature threshold, the steam parameter does not meet the preset condition, and the trigger acquisition unit 12 continues to execute the step of acquiring the steam parameter of the induced draft fan steam turbine set until the steam parameter meets the preset pre-heating condition.
In the embodiment of the invention, the induced draft fan turbine unit comprises a first induced draft fan turbine and a second induced draft fan turbine; the obtaining unit 12 is specifically configured to obtain a first temperature parameter and a first pressure parameter of the first induced draft fan turbine, and obtain a second temperature parameter and a second pressure parameter of the second induced draft fan turbine.
In the embodiment of the invention, the pre-heating condition is that the first temperature parameter is larger than the sum of the queried first saturated steam temperature and a preset first temperature threshold value, and the second temperature parameter is larger than the sum of the queried second saturated steam temperature and a preset second temperature threshold value; the pre-heating control valve group comprises a third control valve between the air heater and the auxiliary steam pipeline, a fourth control valve between the air heater and the auxiliary steam pipeline and a fifth control valve between the air heater and the induced draft fan steam turbine condenser, wherein the third control valve corresponds to the first induced draft fan steam turbine, and the fourth control valve corresponds to the second induced draft fan steam turbine; the closing unit 13 is specifically configured to close the third control valve if the first temperature parameter is greater than the sum of the queried first saturated steam temperature and a preset first temperature threshold; if the second temperature parameter is greater than the sum of the queried second saturated steam temperature and a preset second temperature threshold value, closing a fourth control valve; and if the first temperature parameter is greater than the sum of the queried first saturated steam temperature and the preset first temperature threshold value and the second temperature parameter is greater than the sum of the queried second saturated steam temperature and the preset second temperature threshold value, closing the fifth control valve.
In the embodiment of the present invention, the closing unit 13 is further configured to close the first control valve and the additional fan.
In the embodiment of the invention, the closing unit 13 is also used for controlling the closing of the steam inlet control valve group between the induced draft fan steam turbine set and the auxiliary steam pipeline.
In the scheme of the embodiment of the invention, the newly added fan, the first control valve and the pre-heating control valve group are controlled to be started; a second control valve of the auxiliary steam pipeline is controlled to be opened, so that auxiliary steam enters the pipeline, and steam parameters of a draught fan steam turbine set are obtained; if the steam parameters meet the preset pre-heating conditions, closing the pre-heating control valve group, and completing pipeline pre-heating. The invention can shorten the preheating time of the pipeline, reduce the problems of noise and environmental pollution, simultaneously recover the hydrophobic heat in the preheating process to the primary air of the boiler, avoid energy waste, improve the temperature of the primary air of the boiler to a certain extent, reduce the ignition heat of coal dust, lead the ignition position to move forward, and improve the combustion efficiency of the boiler.
The system, apparatus, module or unit set forth in the above embodiments may be implemented in particular by a computer chip or entity, or by a product having a certain function. A typical implementation device is a computer device, which may be, for example, a personal computer, a laptop computer, a cellular telephone, a camera phone, a smart phone, a personal digital assistant, a media player, a navigation device, an email device, a game console, a tablet computer, a wearable device, or a combination of any of these devices.
The embodiment of the invention provides a computer device, which comprises a memory and a processor, wherein the memory is used for storing information comprising program instructions, the processor is used for controlling the execution of the program instructions, and the program instructions realize the steps of the embodiment of the pipeline preheating method when being loaded and executed by the processor.
Referring now to FIG. 5, there is illustrated a schematic diagram of a computer device 600 suitable for use in implementing embodiments of the present application.
As shown in fig. 5, the computer apparatus 600 includes a Central Processing Unit (CPU) 601, which can perform various appropriate works and processes according to a program stored in a Read Only Memory (ROM) 602 or a program loaded from a storage section 608 into a Random Access Memory (RAM)) 603. In the RAM603, various programs and data required for the operation of the computer device 600 are also stored. The CPU601, ROM602, and RAM603 are connected to each other through a bus 604. An input/output (I/O) interface 605 is also connected to bus 604.
The following components are connected to the I/O interface 605: an input portion 606 including a keyboard, mouse, etc.; an output portion 607 including a Cathode Ray Tube (CRT), a liquid crystal feedback device (LCD), and the like, and a speaker, and the like; a storage section 608 including a hard disk and the like; and a communication section 609 including a network interface card such as a LAN card, a modem, or the like. The communication section 609 performs communication processing via a network such as the internet. The drive 610 is also connected to the I/O interface 606 as needed. Removable media 611 such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, or the like is mounted on drive 610 as needed, so that a computer program read therefrom is mounted as needed as storage section 608.
In particular, according to embodiments of the present invention, the processes described above with reference to flowcharts may be implemented as computer software programs. For example, embodiments of the present invention include a computer program product comprising a computer program tangibly embodied on a machine-readable medium, the computer program comprising program code for performing the method shown in the flowchart. In such an embodiment, the computer program may be downloaded and installed from a network through the communication portion 609, and/or installed from the removable medium 611.
Computer readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of storage media for a computer include, but are not limited to, phase change memory (PRAM), static Random Access Memory (SRAM), dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), read Only Memory (ROM), electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium, which can be used to store information that can be accessed by a computing device. Computer-readable media, as defined herein, does not include transitory computer-readable media (transmission media), such as modulated data signals and carrier waves.
For convenience of description, the above devices are described as being functionally divided into various units, respectively. Of course, the functions of each element may be implemented in one or more software and/or hardware elements when implemented in the present application.
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.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises the element.
The data acquisition, storage, use, processing and the like in the technical scheme meet the relevant regulations of national laws and regulations.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application 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 application 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 application 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.
The foregoing is merely exemplary of the present application and is not intended to limit the present application. Various modifications and changes may be made to the present application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc. which are within the spirit and principles of the present application are intended to be included within the scope of the claims of the present application.
Claims (10)
1. The pipeline preheating method is characterized by being applied to a pipeline preheating system of an induced draft fan steam turbine, wherein the pipeline preheating system comprises a newly-added fan, a first control valve, a second control valve, an auxiliary steam pipeline, an induced draft fan steam turbine set, a heater, a steam inlet control valve set, an air preheater and a preheating control valve set;
the four sections of steam extraction pipelines and the auxiliary steam pipelines are respectively converged into one steam pipeline after passing through the check valve and the second control valve, and then continuously flow along the steam pipeline after being converged, the flow is divided into two paths by the induced draft fan turbine unit, one path of the flow enters the first induced draft fan turbine after passing through the sixth control valve, and the other path of the flow enters the second induced draft fan turbine after passing through the seventh control valve; the exhaust steam after acting in the first induced draft fan steam turbine and the second induced draft fan steam turbine is converged and then enters the induced draft fan steam turbine condenser, and then enters the host condenser after being converged by drainage conveyed by the heater, one channel of pipeline for drainage is led out from the front of the sixth control valve and the seventh control valve by the main steam of the first induced draft fan steam turbine and the second induced draft fan steam turbine respectively, the pipe diameters of the two channels of pipelines are the same as the pipe diameters of the main pipeline so as to increase the ventilation quantity of the steam in the process of starting pipeline preheating, the third control valve and the fourth control valve are respectively arranged on the two channels of pipelines, the steam is conveyed and converged into one channel along the two channels of pipelines and is connected with the inlet of the heater, and the inlet of the heater is used for receiving the steam or hot water conveyed by the pipeline; steam or hot water released by heat in the air heater becomes hydrophobic, and is converged into a hot well of a turbine condenser of the induced draft fan after passing through a fifth control valve, cold air pressurized by a newly added fan is sent into the air heater, heated in the air heater, passes through a first control valve, and is converged with the cold air pressurized by the primary fan and then enters the air preheater; heating the air into hot primary air in an air preheater and then feeding the hot primary air into a coal mill; the flue gas exhausted by the boiler is sent into an air preheater, and after heat is released in the air preheater, the flue gas is sent to a dust remover;
The method comprises the following steps:
the method comprises the steps of controlling and starting a new fan, a first control valve and a pre-heating control valve bank, wherein the new fan is connected with the air heater, the first control valve is arranged between the air heater and the air pre-heater, the first control valve is respectively connected with the air heater and the air pre-heater, the pre-heating control valve bank comprises a third control valve between the air heater and an auxiliary steam pipeline, a fourth control valve between the air heater and the auxiliary steam pipeline and a fifth control valve between the air heater and a draught fan steam turbine condenser, the steam inlet control valve bank comprises a draught fan steam turbine set and an auxiliary steam pipeline, and the steam inlet control valve bank comprises a sixth control valve and a seventh control valve;
a second control valve for controlling the auxiliary steam pipeline is opened, so that auxiliary steam enters the pipeline and steam parameters of a draught fan steam turbine set are obtained, the second control valve is arranged on the auxiliary steam pipeline and is used for controlling circulation of auxiliary steam in the auxiliary steam pipeline;
the induced draft fan steam turbine unit is arranged on the steam pipeline and comprises a first induced draft fan steam turbine and a second induced draft fan steam turbine;
The sixth control valve corresponds to the first induced draft fan turbine, is arranged between the first induced draft fan turbine and the auxiliary steam pipeline and is close to the first induced draft fan turbine;
the seventh control valve corresponds to the second induced draft fan steam turbine, is arranged between the second induced draft fan steam turbine and the auxiliary steam pipeline and is close to the second induced draft fan steam turbine;
if the steam parameters meet the preset pre-heating conditions, closing a pre-heating control valve group, and completing pipeline pre-heating;
the steam parameters comprise temperature parameters and pressure parameters, and the pre-heating condition is that the temperature parameters are larger than the sum of the queried saturated steam temperature and a preset temperature threshold;
before closing the pre-heating control valve group if the steam parameter meets a preset pre-heating condition, the method further comprises:
inquiring the corresponding saturated steam temperature from a preset saturated steam temperature corresponding table according to the pressure parameter;
if the temperature parameter is larger than the sum of the queried saturated steam temperature and a preset temperature threshold value, the steam parameter meets a preset condition, and the step of closing the pre-heating control valve group is continuously executed;
if the temperature parameter is smaller than or equal to the sum of the queried saturated steam temperature and the preset temperature threshold value, the steam parameter does not meet the preset condition, and continuing to execute the step of acquiring the steam parameter of the induced draft fan steam turbine unit until the steam parameter meets the preset pre-heating condition.
2. The method of warming up a pipe according to claim 1, wherein the controlling the second control valve of the auxiliary steam pipe to be opened so that the auxiliary steam enters the pipe includes:
and controlling the second control valve to be opened according to the set opening threshold according to the specified time period, so that auxiliary steam starts to enter the pipeline until the second control valve is completely opened.
3. A method for preheating a pipeline according to claim 1,
the obtaining of the steam parameters of the induced draft fan turbine set comprises the following steps:
acquiring a first temperature parameter and a first pressure parameter of the first induced draft fan turbine, and acquiring a second temperature parameter and a second pressure parameter of the second induced draft fan turbine.
4. A method of pre-heating a pipe according to claim 3, wherein the pre-heating condition is that the first temperature parameter is greater than a sum of the queried first saturated steam temperature and a preset first temperature threshold, and the second temperature parameter is greater than a sum of the queried second saturated steam temperature and a preset second temperature threshold; the third control valve corresponds to the first induced draft fan turbine, and the fourth control valve corresponds to the second induced draft fan turbine;
If the steam parameter meets a preset pre-heating condition, closing a pre-heating control valve group, wherein the pre-heating control valve group comprises:
if the first temperature parameter is greater than the sum of the queried first saturated steam temperature and a preset first temperature threshold value, closing the third control valve;
if the second temperature parameter is greater than the sum of the queried second saturated steam temperature and a preset second temperature threshold value, closing the fourth control valve;
and if the first temperature parameter is greater than the sum of the queried first saturated steam temperature and a preset first temperature threshold value and the second temperature parameter is greater than the sum of the queried second saturated steam temperature and a preset second temperature threshold value, closing the fifth control valve.
5. The method of claim 1, further comprising, after closing the pre-warm control valve bank:
and closing the first control valve and the newly-added fan.
6. The method of duct preheating of claim 1, further comprising, prior to opening the second control valve controlling the auxiliary steam duct:
and controlling a steam inlet control valve group between the induced draft fan steam turbine unit and the auxiliary steam pipeline to be closed.
7. A duct preheating system, the system comprising: the system comprises a controller, a newly-added fan, a first control valve, a pre-heating control valve bank, a second control valve, an auxiliary steam pipeline, a heater, a steam inlet control valve bank, an air pre-heater and an induced draft fan steam turbine set;
The four sections of steam extraction pipelines and the auxiliary steam pipelines are respectively converged into one steam pipeline after passing through the check valve and the second control valve, and then continuously flow along the steam pipeline after being converged, the flow is divided into two paths by the induced draft fan turbine unit, one path of the flow enters the first induced draft fan turbine after passing through the sixth control valve, and the other path of the flow enters the second induced draft fan turbine after passing through the seventh control valve; the exhaust steam after acting in the first induced draft fan steam turbine and the second induced draft fan steam turbine is converged and then enters the induced draft fan steam turbine condenser, and then enters the host condenser after being converged by drainage conveyed by the heater, one channel of pipeline for drainage is led out from the front of the sixth control valve and the seventh control valve by the main steam of the first induced draft fan steam turbine and the second induced draft fan steam turbine respectively, the pipe diameters of the two channels of pipelines are the same as the pipe diameters of the main pipeline so as to increase the ventilation quantity of the steam in the process of starting pipeline preheating, the third control valve and the fourth control valve are respectively arranged on the two channels of pipelines, the steam is conveyed and converged into one channel along the two channels of pipelines and is connected with the inlet of the heater, and the inlet of the heater is used for receiving the steam or hot water conveyed by the pipeline; steam or hot water released by heat in the air heater becomes hydrophobic, and is converged into a hot well of a turbine condenser of the induced draft fan after passing through a fifth control valve, cold air pressurized by a newly added fan is sent into the air heater, heated in the air heater, passes through a first control valve, and is converged with the cold air pressurized by the primary fan and then enters the air preheater; heating the air into hot primary air in an air preheater and then feeding the hot primary air into a coal mill; the flue gas exhausted by the boiler is sent into an air preheater, and after heat is released in the air preheater, the flue gas is sent to a dust remover;
The novel air heater is characterized in that the novel air heater is connected with the air heater, the first control valve is arranged between the air heater and the air pre-heater, the first control valve is respectively connected with the air heater and the air pre-heater, the second control valve is arranged on an auxiliary steam pipeline, the pre-heating control valve group comprises a third control valve between the air heater and the auxiliary steam pipeline, a fourth control valve between the air heater and the auxiliary steam pipeline and a fifth control valve between the air heater and a draught fan steam turbine condenser, the steam inlet control valve group comprises a sixth control valve and a seventh control valve, and the air inlet control valve group comprises a third control valve and a fourth control valve;
the induced draft fan steam turbine unit is arranged on the steam pipeline and comprises a first induced draft fan steam turbine and a second induced draft fan steam turbine; the sixth control valve corresponds to the first induced draft fan turbine, is arranged between the first induced draft fan turbine and the auxiliary steam pipeline and is close to the first induced draft fan turbine; the seventh control valve corresponds to the second induced draft fan steam turbine, is arranged between the second induced draft fan steam turbine and the auxiliary steam pipeline and is close to the second induced draft fan steam turbine;
The controller is used for controlling the starting of the newly-added fan, the first control valve and the pre-heating control valve group; a second control valve of the auxiliary steam pipeline is controlled to be opened, so that auxiliary steam enters the pipeline, and steam parameters of a draught fan steam turbine set are obtained; if the steam parameters meet the preset pre-heating conditions, closing a pre-heating control valve group, and completing pipeline pre-heating;
the second control valve is used for controlling circulation of auxiliary steam in the auxiliary steam pipeline;
the steam parameters comprise temperature parameters and pressure parameters, and the pre-heating condition is that the temperature parameters are larger than the sum of the queried saturated steam temperature and a preset temperature threshold;
the controller is also used for inquiring the corresponding saturated steam temperature from a preset saturated steam temperature corresponding table according to the pressure parameter; if the temperature parameter is larger than the sum of the queried saturated steam temperature and a preset temperature threshold value, the steam parameter meets a preset condition, and the step of closing the pre-heating control valve group is continuously executed; if the temperature parameter is smaller than or equal to the sum of the queried saturated steam temperature and the preset temperature threshold value, the steam parameter does not meet the preset condition, and continuing to execute the step of acquiring the steam parameter of the induced draft fan steam turbine unit until the steam parameter meets the preset pre-heating condition.
8. The controller is characterized by being applied to a pipeline preheating system of a draught fan steam turbine, wherein the pipeline preheating system comprises a newly-added fan, a first control valve, a second control valve, an auxiliary steam pipeline, a draught fan steam turbine set, a heater, a steam inlet control valve set, an air preheater and a preheating control valve set;
the four sections of steam extraction pipelines and the auxiliary steam pipelines are respectively converged into one steam pipeline after passing through the check valve and the second control valve, and then continuously flow along the steam pipeline after being converged, the flow is divided into two paths by the induced draft fan turbine unit, one path of the flow enters the first induced draft fan turbine after passing through the sixth control valve, and the other path of the flow enters the second induced draft fan turbine after passing through the seventh control valve; the exhaust steam after acting in the first induced draft fan steam turbine and the second induced draft fan steam turbine is converged and then enters the induced draft fan steam turbine condenser, and then enters the host condenser after being converged by drainage conveyed by the heater, one channel of pipeline for drainage is led out from the front of the sixth control valve and the seventh control valve by the main steam of the first induced draft fan steam turbine and the second induced draft fan steam turbine respectively, the pipe diameters of the two channels of pipelines are the same as the pipe diameters of the main pipeline so as to increase the ventilation quantity of the steam in the process of starting pipeline preheating, the third control valve and the fourth control valve are respectively arranged on the two channels of pipelines, the steam is conveyed and converged into one channel along the two channels of pipelines and is connected with the inlet of the heater, and the inlet of the heater is used for receiving the steam or hot water conveyed by the pipeline; steam or hot water released by heat in the air heater becomes hydrophobic, and is converged into a hot well of a turbine condenser of the induced draft fan after passing through a fifth control valve, cold air pressurized by a newly added fan is sent into the air heater, heated in the air heater, passes through a first control valve, and is converged with the cold air pressurized by the primary fan and then enters the air preheater; heating the air into hot primary air in an air preheater and then feeding the hot primary air into a coal mill; the flue gas exhausted by the boiler is sent into an air preheater, and after heat is released in the air preheater, the flue gas is sent to a dust remover;
The controller includes:
the starting unit is used for controlling and starting a newly-increased fan, a first control valve and a pre-heating control valve bank, wherein the first control valve is arranged between the air heater and the air pre-heater, the first control valve is respectively connected with the air heater and the air pre-heater, the newly-increased fan is connected with the air heater, the pre-heating control valve bank comprises a third control valve between the air heater and an auxiliary steam pipeline, a fourth control valve between the air heater and the auxiliary steam pipeline and a fifth control valve between the air heater and an induced draft fan steam turbine condenser, the steam inlet control valve bank comprises a sixth control valve and a seventh control valve, and the third control valve is arranged between the induced draft fan steam turbine set and the auxiliary steam pipeline;
the acquisition unit is used for controlling a second control valve of the auxiliary steam pipeline to be opened so that auxiliary steam enters the pipeline and acquiring steam parameters of the induced draft fan steam turbine unit, the second control valve is arranged on the auxiliary steam pipeline and is used for controlling circulation of the auxiliary steam in the auxiliary steam pipeline; the induced draft fan steam turbine unit is arranged on the steam pipeline and comprises a first induced draft fan steam turbine and a second induced draft fan steam turbine; the sixth control valve corresponds to the first induced draft fan turbine, is arranged between the first induced draft fan turbine and the auxiliary steam pipeline and is close to the first induced draft fan turbine; the seventh control valve corresponds to the second induced draft fan steam turbine, is arranged between the second induced draft fan steam turbine and the auxiliary steam pipeline and is close to the second induced draft fan steam turbine;
The closing unit is used for closing the preheating control valve group and completing pipeline preheating if the steam parameters meet the preset preheating conditions;
the steam parameters comprise temperature parameters and pressure parameters, and the pre-heating condition is that the temperature parameters are larger than the sum of the queried saturated steam temperature and a preset temperature threshold;
further comprises:
the inquiring unit is used for inquiring the corresponding saturated steam temperature from a preset saturated steam temperature corresponding table according to the pressure parameter; if the temperature parameter is greater than the sum of the queried saturated steam temperature and a preset temperature threshold value, the steam parameter meets a preset condition, and the closing unit is triggered to continuously execute the step of closing the pre-heating control valve group; if the temperature parameter is smaller than or equal to the sum of the queried saturated steam temperature and the preset temperature threshold value, the steam parameter does not meet the preset condition, and the acquisition unit is triggered to continuously execute the step of acquiring the steam parameter of the induced draft fan steam turbine unit until the steam parameter meets the preset pre-heating condition.
9. A computer readable medium on which a computer program is stored, characterized in that the program, when executed by a processor, implements a pipeline pre-warming method according to any one of claims 1 to 6.
10. A computer device comprising a memory for storing information including program instructions and a processor for controlling execution of the program instructions, wherein the program instructions when loaded and executed by the processor implement the pipeline pre-warming method of any one of claims 1 to 6.
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| CN115263448B (en) * | 2022-08-02 | 2023-12-01 | 西安热工研究院有限公司 | Cold state pre-heating start control test method for gas-steam combined cycle unit steam turbine |
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