CN114076005B - Medium-pressure heat supply system, control device and medium-pressure heat supply method - Google Patents
Medium-pressure heat supply system, control device and medium-pressure heat supply method Download PDFInfo
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- CN114076005B CN114076005B CN202111290395.XA CN202111290395A CN114076005B CN 114076005 B CN114076005 B CN 114076005B CN 202111290395 A CN202111290395 A CN 202111290395A CN 114076005 B CN114076005 B CN 114076005B
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- 238000005259 measurement Methods 0.000 claims description 44
- 238000010438 heat treatment Methods 0.000 claims description 20
- 238000012544 monitoring process Methods 0.000 claims description 5
- 230000001276 controlling effect Effects 0.000 claims description 4
- 230000033228 biological regulation Effects 0.000 description 4
- 230000003247 decreasing effect Effects 0.000 description 2
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- 230000002093 peripheral effect Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
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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
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
- F01K7/16—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being only of turbine type
- F01K7/22—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being only of turbine type the turbines having inter-stage steam heating
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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
- F01D17/00—Regulating or controlling by varying flow
- F01D17/10—Final actuators
- F01D17/105—Final actuators by passing part of the fluid
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K17/00—Using steam or condensate extracted or exhausted from steam engine plant
- F01K17/02—Using steam or condensate extracted or exhausted from steam engine plant for heating purposes, e.g. industrial, domestic
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
- F01K7/16—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being only of turbine type
- F01K7/22—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being only of turbine type the turbines having inter-stage steam heating
- F01K7/24—Control or safety means specially adapted therefor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D1/00—Steam central heating systems
- F24D1/04—Steam central heating systems operating with exhaust steam
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D1/00—Steam central heating systems
- F24D1/08—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D19/00—Details
- F24D19/10—Arrangement or mounting of control or safety devices
- F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
- F24D19/1009—Arrangement or mounting of control or safety devices for water heating systems for central heating
- F24D19/1015—Arrangement or mounting of control or safety devices for water heating systems for central heating using a valve or valves
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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
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Control Of Turbines (AREA)
Abstract
The application discloses a medium-pressure heat supply system, a control device and a medium-pressure heat supply method. The medium-pressure heat supply method comprises the following steps: determining a target opening degree of a medium-pressure speed regulating valve through the medium-pressure steam demand of a heat supply demand party, wherein the medium-pressure speed regulating valve is arranged on a medium-pressure steam conveying pipeline and is used for regulating the medium-pressure steam flow rate entering a medium-pressure cylinder of a steam turbine, and a medium-pressure steam outlet of a boiler is connected with a medium-pressure steam inlet of the medium-pressure cylinder through the medium-pressure steam conveying pipeline; judging whether the target opening is larger than or equal to a threshold value of the opening of the medium-pressure speed regulating valve; wherein the threshold value is determined in advance by testing the turbine; and under the condition that the target opening is greater than or equal to the threshold value, regulating the medium-pressure speed regulating valve to the target opening to regulate the flow rate of steam entering the medium-pressure cylinder so as to regulate the flow rate of medium-pressure steam of the medium-pressure heat supply pipeline, wherein the medium-pressure heat supply pipeline is connected with the medium-pressure steam conveying pipeline, so that heat can be supplied through the medium-pressure steam provided by the medium-pressure heat supply pipeline.
Description
Technical Field
The application relates to the technical field of thermal engineering, in particular to a medium-pressure heating system, a control device and a medium-pressure heating method.
Background
Cogeneration is an effective means for reducing unit emissions and improving economic benefits of power plants. With the vigorous development of the industries of biological pharmacy, chemical industry and the like in China, the requirement for medium-parameter steam with the pressure parameter of 1.5MPa to 2.5MPa is increased, so that a power plant is required to provide medium-pressure steam for heat supply.
Disclosure of Invention
The medium-pressure heating system, the control device and the medium-pressure heating method provided by the embodiment of the application can be used for solving the problems in the prior art.
The embodiment of the application provides a medium-pressure heat supply method, which comprises the following steps:
determining a target opening degree of a medium-pressure speed regulating valve through medium-pressure steam demand of a heat supply demand party, wherein the medium-pressure speed regulating valve is arranged in a medium-pressure steam conveying pipeline and is used for regulating medium-pressure steam flow rate entering a medium-pressure cylinder of a steam turbine, and a medium-pressure steam outlet of a boiler is connected with a medium-pressure steam inlet of the medium-pressure cylinder through the medium-pressure steam conveying pipeline;
judging whether the target opening is larger than or equal to a threshold value of the opening of the medium-pressure speed regulating valve; wherein the threshold is determined in advance by testing the turbine;
and under the condition that the target opening is greater than or equal to the threshold value, regulating the medium-pressure speed regulating valve to the target opening to regulate the flow rate of steam entering the medium-pressure cylinder so as to regulate the flow rate of medium-pressure steam of a medium-pressure heat supply pipeline, wherein the medium-pressure heat supply pipeline is connected with the medium-pressure steam conveying pipeline.
Preferably, the threshold value is predetermined by the following method:
the medium-pressure speed regulating valve obtains an actual measurement value of at least one safety index of the steam turbine under the current opening degree;
determining to increase or decrease the opening of the medium-pressure speed regulating valve according to whether the obtained actual measurement values of all the safety indexes are in the standard range;
and re-acquiring the actual measurement value of at least one safety index of the steam turbine, and re-determining to increase or decrease the opening of the medium-pressure speed regulating valve according to whether the re-acquired actual measurement values of the safety indexes are all in a standard range until the threshold value is determined.
Preferably, determining to increase or decrease the opening of the medium-pressure speed regulation valve according to whether the obtained actual measurement values of the various safety indexes are all within the standard range, specifically includes:
reducing the opening of the medium-pressure speed regulating valve under the condition that the obtained actual measurement values of all the safety indexes are in the standard range; or alternatively, the first and second heat exchangers may be,
and increasing the opening degree of the medium-pressure speed regulating valve under the condition that the measured value of one or more safety indexes exceeds the standard range.
Preferably, obtaining an actual measurement value of at least one safety index of the steam turbine specifically includes:
and obtaining an actual measurement value of at least one safety index of the steam turbine in a real-time monitoring mode.
Preferably, obtaining an actual measurement value of at least one safety index of the steam turbine specifically includes:
and obtaining the actual measurement value of the vibration amplitude and/or the bearing temperature of the bearing of the steam turbine.
Preferably, the method further comprises: and under the condition that the target opening is smaller than the threshold value, adjusting the opening of the medium-pressure speed regulating valve to the threshold value.
The embodiment of the application also provides a control device, which comprises: the device comprises a target opening determining module, a judging module and an adjusting module, wherein:
the target opening determining module is used for determining the target opening of the medium-pressure speed regulating valve through the medium-pressure steam demand of the heat supply demand party, wherein the medium-pressure speed regulating valve is arranged on a medium-pressure steam conveying pipeline and is used for adjusting the medium-pressure steam flow rate entering a medium-pressure cylinder of the steam turbine, and a medium-pressure steam outlet of the boiler is connected with a medium-pressure steam inlet of the medium-pressure cylinder through the medium-pressure steam conveying pipeline;
the judging module is used for judging whether the target opening is larger than or equal to a threshold value of the opening of the medium-pressure speed regulating valve; wherein the threshold is determined in advance by testing the turbine;
and the adjusting module is used for adjusting the medium-pressure speed adjusting valve to the target opening degree to adjust the flow rate of steam entering the medium-pressure cylinder so as to adjust the medium-pressure steam flow rate of the medium-pressure heat supply pipeline under the condition that the target opening degree is larger than or equal to the threshold value, wherein the medium-pressure heat supply pipeline is connected with the medium-pressure steam conveying pipeline.
Preferably, the control device further includes: and the second adjusting module is used for adjusting the opening of the medium-pressure speed regulating valve to the threshold value under the condition that the target opening is smaller than the threshold value.
Preferably, the control device further includes: the threshold value determining module is used for acquiring an actual measurement value of at least one safety index of the steam turbine under the current opening of the medium-pressure speed regulating valve; determining to increase or decrease the opening of the medium-pressure speed regulating valve according to whether the obtained actual measurement values of all the safety indexes are in the standard range; and re-acquiring the actual measurement value of at least one safety index of the steam turbine, and re-determining to increase or decrease the opening of the medium-pressure speed regulating valve according to whether the re-acquired actual measurement values of the safety indexes are all in a standard range until the threshold value is determined.
The embodiment of the application also provides a medium-pressure heating system, which comprises: steam turbine, boiler, middling pressure steam delivery pipeline, middling pressure heating pipeline and controlling means that are provided with the middling pressure jar, wherein:
the medium pressure steam outlet of the boiler is connected with the medium pressure steam inlet of the medium pressure cylinder through the medium pressure steam conveying pipeline, wherein the medium pressure steam conveying pipeline is provided with a medium pressure speed regulating valve for regulating the flow rate of the medium pressure steam entering the medium pressure cylinder;
the medium-pressure heat supply pipeline is connected with the medium-pressure steam conveying pipeline; the method comprises the steps of,
the control device includes: the device comprises a target opening determining module, a judging module and an adjusting module, wherein: the target opening determining module is used for determining the target opening of the medium-pressure speed regulating valve through the medium-pressure steam demand of the heat supply demand party; the judging module is used for judging whether the target opening is larger than or equal to a threshold value of the opening of the medium-pressure speed regulating valve; wherein the threshold is determined in advance by testing the turbine; and the adjusting module is used for adjusting the medium-pressure speed regulating valve to the target opening degree to adjust the flow rate of steam entering the medium-pressure cylinder so as to adjust the flow rate of medium-pressure steam of the medium-pressure heat supply pipeline under the condition that the target opening degree is smaller than or equal to the threshold value.
The above at least one technical scheme adopted by the embodiment of the application can achieve the following beneficial effects:
the medium-pressure heat supply method provided by the embodiment of the application comprises the following steps: determining a target opening degree of a medium-pressure speed regulating valve through medium-pressure steam demand of a heat supply demand party, wherein the medium-pressure speed regulating valve is arranged in a medium-pressure steam conveying pipeline and is used for regulating medium-pressure steam flow rate entering a medium-pressure cylinder of a steam turbine, and a medium-pressure steam outlet of a boiler is connected with a medium-pressure steam inlet of the medium-pressure cylinder through the medium-pressure steam conveying pipeline; judging whether the target opening is larger than or equal to a threshold value of the opening of the medium-pressure speed regulating valve; wherein the threshold is determined in advance by testing the turbine; and under the condition that the target opening is greater than or equal to the threshold value, regulating the medium-pressure speed regulating valve to the target opening to regulate the flow rate of steam entering the medium-pressure cylinder so as to regulate the flow rate of medium-pressure steam of the medium-pressure heat supply pipeline, wherein the medium-pressure heat supply pipeline is connected with the medium-pressure steam conveying pipeline, so that heat supply can be carried out through the medium-pressure steam provided by the medium-pressure heat supply pipeline.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute a limitation on the application. In the drawings:
FIG. 1 is a schematic diagram of the overall structure of a thermal power plant according to an embodiment of the present application;
fig. 2 is a schematic flow chart of a medium-pressure heat supply method according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be clearly and completely described below with reference to specific embodiments of the present application and corresponding drawings. It will be apparent that the described embodiments are only some, but not all, embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The following describes in detail the technical solutions provided by the embodiments of the present application with reference to the accompanying drawings.
Based on this, the present proposal provides a medium pressure heating system, which can be used for providing medium parameter steam with pressure parameters of 1.5MPa to 2.5MPa for heating. In order to facilitate understanding of the structure of the medium-pressure heating system provided in the present disclosure, the overall structure of the thermal power plant may be described first.
The overall structure of a thermal power plant generally includes a boiler 1, a steam turbine 2, and a generator set 3, wherein the boiler 1 is configured to supply steam, including high-pressure steam, medium-pressure steam, and the like, and the steam turbine 2 is provided with a high-pressure cylinder 21, a medium-pressure cylinder 22, and a low-pressure cylinder. The high-pressure steam outlet of the boiler 1 is connected to the high-pressure steam inlet of the high-pressure cylinder 21 of the steam turbine 2 through the high-pressure steam delivery pipe 4, so that the high-pressure steam can be delivered to the high-pressure cylinder 21 of the steam turbine 2 through the boiler 1, and the high-pressure steam outlet of the high-pressure cylinder 21 of the steam turbine 2 can deliver the high-pressure steam to the generator set 3, and then the generator set 3 generates electricity by using the high-pressure steam.
After the generator set 3 generates electricity by using the high-pressure steam of the high-pressure cylinder 21, the pressure parameter of the steam is reduced to about 4.0MP, and the steam with the reduced pressure parameter is conveyed to the boiler 1 again through the steam outlet of the generator set 3 for treatment, so that the pressure parameter of the steam with the reduced pressure parameter is reduced to 1.5 MPa-2.5 MPa (for example, about 2.0 MPa), and the steam becomes medium-pressure steam for use by the outside industry users. The medium pressure heating system provided by the proposal comprises a steam turbine 2 provided with a medium pressure cylinder 22, a boiler 1, a medium pressure steam conveying pipeline 5, a medium pressure heating pipeline and a control device, wherein:
the intermediate pressure steam outlet of the boiler 1 and the intermediate pressure steam inlet of the intermediate pressure cylinder 22 of the steam turbine 2 are connected by an intermediate pressure steam delivery pipe 5, and thereby the intermediate pressure steam can be delivered from the boiler 1 to the intermediate pressure cylinder 22 of the steam turbine 2 through the intermediate pressure steam delivery pipe 5. And, the medium pressure steam delivery pipe 5 is provided with a medium pressure throttle valve 6, and the medium pressure throttle valve 6 can be used for adjusting the steam flow rate entering the medium pressure cylinder 22 (i.e. the flow rate of medium pressure steam), for example, when the opening degree of the medium pressure throttle valve 6 is increased, the steam flow rate entering the medium pressure cylinder 22 is correspondingly increased, or when the opening degree of the medium pressure throttle valve 6 is reduced, the steam flow rate entering the medium pressure cylinder 22 is correspondingly reduced.
It should be further noted that, in general, medium pressure steam inlets may be provided at the bottom and top of the medium pressure cylinder 22, respectively, and these two medium pressure steam inlets may be connected through the medium pressure steam delivery pipe 5, so that medium pressure steam may be simultaneously delivered from the bottom and top into the medium pressure cylinder 22, thereby maintaining balance of the steam at the upper and lower sides of the interior of the medium pressure cylinder 22. In this case, medium pressure governor gates 6 may be provided in the medium pressure steam delivery pipes 5 near the medium pressure steam inlets near the bottom and the top, respectively, and the opening degrees of the two medium pressure governor gates 6 may be kept generally the same to keep the balance of the upper and lower side steam inside the medium pressure cylinder 22.
The medium pressure heat supply pipe 7 is connected to the medium pressure steam delivery pipe 5 so that medium pressure steam can flow into the connected medium pressure heat supply pipe 7 through the medium pressure steam delivery pipe 5, and thus the medium pressure steam is supplied to the outside of the system through the medium pressure heat supply pipe 7 to supply heat. For example, the medium pressure heat supply pipe 7 may be connected to the heat supply demand side, so that the heat supply demand side can obtain medium pressure steam through the medium pressure heat supply pipe 7.
It should be noted that, since the medium pressure governing valve 6 can be used to adjust the flow rate of steam entering the medium pressure cylinder 22, when the flow rate of medium pressure steam entering the medium pressure steam delivery pipe 5 from the medium pressure steam outlet of the boiler 1 is relatively fixed, by adjusting the opening of the medium pressure governing valve 6, the flow rate of medium pressure steam in the medium pressure heat supply pipe 7 can also be adjusted, for example, when the opening of the medium pressure governing valve 6 is increased, since the flow rate of medium pressure steam entering the medium pressure cylinder 22 is increased, the flow rate of medium pressure steam entering the medium pressure heat supply pipe 7 is correspondingly decreased; or when the opening degree of the medium pressure governing valve 6 is reduced, the flow rate of the medium pressure steam into the medium pressure cylinder 22 is reduced, and the flow rate of the medium pressure steam into the medium pressure heat supply pipe 7 is correspondingly increased.
The control device can be used for controlling the opening of the medium pressure speed regulating valve 6, so as to regulate the medium pressure steam flow rate entering the medium pressure cylinder 22 by controlling the opening of the medium pressure speed regulating valve 6, thereby regulating the medium pressure steam flow rate of the medium pressure heat supply pipeline 7. For example, the opening degree of the medium-pressure governor valve 6 can be controlled to be increased, decreased, turned on, turned off, and the like by the control device.
In practical application, in order to facilitate the control device to control the opening of the medium-pressure speed-regulating valve, a hydraulic control valve can be adopted as the medium-pressure speed-regulating valve, so that the control device can be controlled remotely.
In practical applications, when the flow rate of the medium pressure steam entering the medium pressure cylinder 22 of the steam turbine 2 is too small, the bearing vibration amplitude of the steam turbine 2 may be increased, the temperature of the bearing may be increased, and an alarm may be triggered, even if the machine fails. Therefore, the threshold value of the opening of the intermediate pressure governor valve 6 may be predetermined by testing the turbine 2 or otherwise, and when the opening of the intermediate pressure governor valve 6 is smaller than the threshold value, it indicates that the opening is too small, and accordingly, the flow rate of the intermediate pressure steam entering the intermediate pressure cylinder 22 of the turbine 2 is too small, which may cause an increase in the vibration amplitude of the bearing of the turbine 2, an increase in the temperature of the bearing, and the like, so that the threshold value reflects the limit of the flow rate of the corresponding intermediate pressure steam on the premise that the turbine 2 can normally operate.
According to the application, the influence on the stability, the high-row pressure and the high-row temperature of the central control valve is checked through the adjustment of the opening degree of the central control valve, so that the influence on various safety indexes in the operation of the unit is judged. Finally, the steam supply flow can be ensured by adopting the medium-pressure regulating valve to regulate, thereby not only meeting the power generation of the unit, but also improving the steam extraction quantity of reheat steam, and the test result proves that the steam supply capacity of the unit in the form can reach about 600 t/h.
At this time, the control device may include: the device comprises a target opening determining module, a judging module and an adjusting module, wherein: the target opening determining module is used for determining the target opening of the medium-pressure speed regulating valve 6 according to the medium-pressure steam demand of the heat supply demand side. For example, the medium pressure steam demand of the peripheral heat supply demand side may be counted first, and then the target opening degree of the medium pressure governor valve 6 may be calculated based on the medium pressure steam demand.
The judging module is used for judging whether the target opening is larger than or equal to a threshold value of the opening of the medium-pressure speed regulating valve 6.
The adjusting module is used for adjusting the medium-pressure speed adjusting valve 6 to the target opening degree to adjust the steam flow rate entering the medium-pressure cylinder 22 to adjust the medium-pressure steam flow rate of the medium-pressure heat supply pipeline 7 under the condition that the target opening degree is larger than or equal to the threshold value. In this case, since the medium pressure governing valve 6 is regulated to the target opening degree, the demand of the heat supply demand side can be satisfied.
Of course, in the case where the determination module determines that the target opening degree is smaller than the threshold value, if the medium pressure governing valve 6 is continuously adjusted to the target opening degree at this time, there is a possibility that the bearing vibration amplitude of the steam turbine 2 increases, the temperature of the bearing increases, or the like. At this time, a prompt module may be further added to the control device, and configured to issue a prompt when the target opening is smaller than the threshold value, where the prompt module may issue a prompt by means of sound, screen display, and the like, and this is not limited herein. In addition, when the target opening is smaller than the threshold value, the current opening of the medium pressure regulating valve 6 may not be adjusted; of course, in order to provide as much medium pressure steam as possible to the heat supply consumers, the control device may then further comprise: and the second adjusting module is used for adjusting the opening of the medium-pressure speed regulating valve 6 to the threshold value under the condition that the target opening is smaller than the threshold value, so that the normal operation of the steam turbine is ensured, and the air is supplied to the heat supply demand side as much as possible.
In practical applications, the control device may further include a threshold determining module, where the threshold determining module can be used to determine a threshold of the opening of the medium pressure governing valve 6, and the specific manner in which the threshold determining module determines the threshold may include: for example, the threshold value may be determined according to an input value of an operator, and in general, when the working experience of the operator is relatively rich, the magnitude of the threshold value may be estimated according to personal working experience, and the estimated magnitude may be input as the input value to the threshold value determining module, so that the threshold value determining module determines the threshold value according to the input value; another way to determine the threshold value may be to determine the threshold value in advance by testing the steam turbine, for example, the actual measurement value of at least one safety index of the steam turbine is obtained under the current opening of the medium-pressure speed regulating valve 6; determining to increase or decrease the opening of the medium-pressure speed regulating valve 6 according to whether the actual measurement values of the obtained safety indexes are all in the standard range, then re-acquiring the actual measurement value of at least one safety index of the steam turbine, and re-determining to increase or decrease the opening of the medium-pressure speed regulating valve 6 according to whether the re-acquired actual measurement values of the safety indexes are all in the standard range until the threshold value is determined.
For example, under the current opening degree, the medium-pressure speed-regulating valve 6 observes whether the measured values of one or more safety indexes are all in the standard range, if all are in the standard range, the opening degree may be excessively large at this time, the opening degree may be reduced, and then further observation is performed, or if one or more of the opening degrees exceeds the standard range, the opening degree may be excessively small at this time, the opening degree may be increased, and then further observation is performed, so that multiple tests are performed, and the threshold value is determined by means of continuous approximation.
Based on the medium-pressure heating system provided by the present disclosure, the present disclosure may further provide a medium-pressure heating method, which may also solve the problem in the prior art, as shown in fig. 1, where the medium-pressure heating method includes the following steps:
step S1: and determining the target opening degree of the medium-pressure speed regulating valve according to the medium-pressure steam demand of the heat supply demand side.
Step S2: and judging whether the target opening is larger than or equal to a threshold value of the opening of the medium-pressure speed regulating valve, if so, executing the step S3.
Step S3: and when the target opening is greater than or equal to the threshold value, the medium-pressure speed regulating valve is regulated to the target opening to regulate the flow rate of steam entering the medium-pressure cylinder.
In addition, when the target opening is smaller than the threshold value, a prompt can be sent out in a sound, screen display and other modes, and when the target opening is smaller than the threshold value, the current opening of the medium-pressure speed regulating valve can not be regulated; of course, in order to supply the medium pressure steam to the outside of the system as much as possible, if the target opening is smaller than the threshold value, the opening of the medium pressure governor valve may be adjusted to the threshold value, so that on the one hand, the normal operation of the steam turbine is ensured, and on the other hand, the air supply is also performed to the outside of the system as much as possible.
Alternatively, the threshold may be determined in advance by testing the turbine, or by an operator based on personal work experience, or by other means.
For example, when a threshold value of the opening of the medium-pressure speed regulation valve is predetermined, the steam turbine can be tested, for example, the current opening of the medium-pressure speed regulation valve is a first opening, the actual measurement values of various safety indexes such as the vibration amplitude of a bearing and the temperature of the bearing of the steam turbine can be obtained in a real-time monitoring mode, then whether the actual measurement values of the safety indexes are in a standard range or not is determined, if so, the steam turbine can normally work under the first opening, and if so, the threshold value of the opening of the medium-pressure speed regulation valve is possibly smaller than the first opening; otherwise, when the measured value of one or more safety indexes exceeds the standard range, the first opening degree is too small, the threshold value of the opening degree of the medium-pressure speed regulating valve is possibly larger than the first opening degree, and when the opening degree of the medium-pressure speed regulating valve is the first opening degree, the steam turbine can be warned or even the machine is in fault.
In the above process, if the actual measurement values of each safety index are all within the standard range, in order to determine the threshold value, the opening of the medium-pressure speed-regulating valve can be further reduced to a second opening, the actual measurement values (called as second actual measurement values) of each safety index under the second opening are obtained through a real-time monitoring mode, and then whether the second actual measurement values are all within the standard range is determined, if yes, it is indicated that the steam turbine can normally work under the second opening, the threshold value of the opening of the medium-pressure speed-regulating valve is possibly smaller than the second opening, and at this time, the opening of the medium-pressure speed-regulating valve can be further reduced to a third opening for testing; otherwise, the second opening degree is too small, the threshold value of the opening degree of the medium-pressure speed-regulating valve is between the first opening degree and the second opening degree, at the moment, the opening degree of the medium-pressure speed-regulating valve can be increased to a fourth opening degree, wherein the fourth opening degree is between the first opening degree and the second opening degree, then the actual measurement values of all safety indexes under the fourth opening degree are obtained in a real-time monitoring mode, and then whether the actual measurement values of all the safety indexes are in a standard range is determined. In this way, the threshold value of the opening degree of the medium-pressure speed regulating valve can be continuously approximated and finally determined.
The following is shown:
it should 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 an element.
The foregoing is merely exemplary of the present application and is not intended to limit the present application. Various modifications and variations of the present application will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the application are to be included in the scope of the claims of the present application.
Claims (8)
1. A medium pressure heating method, the method comprising:
determining a target opening degree of a medium-pressure speed regulating valve through medium-pressure steam demand of a heat supply demand party, wherein the medium-pressure speed regulating valve is arranged in a medium-pressure steam conveying pipeline and is used for regulating medium-pressure steam flow rate entering a medium-pressure cylinder of a steam turbine, medium-pressure steam inlets are formed in the top and the bottom of the medium-pressure cylinder of the steam turbine, a medium-pressure steam outlet of a boiler is connected with two medium-pressure steam inlets of the medium-pressure cylinder through the medium-pressure steam conveying pipeline, the medium-pressure speed regulating valves are respectively arranged on pipelines, close to the top and the bottom of the medium-pressure cylinder of the steam turbine, of the medium-pressure steam conveying pipeline, and the opening degree of the two medium-pressure speed regulating valves is the same;
judging whether the target opening is larger than or equal to a threshold value of the opening of the medium-pressure speed regulating valve; wherein the threshold is determined in advance by testing the turbine;
the threshold value is predetermined by the following method:
the medium-pressure speed regulating valve obtains an actual measurement value of at least one safety index of the steam turbine under the current opening degree;
determining to increase or decrease the opening of the medium-pressure speed regulating valve according to whether the obtained actual measurement values of all the safety indexes are in the standard range;
re-acquiring the actual measurement value of at least one safety index of the steam turbine, and re-determining to increase or decrease the opening of the medium-pressure speed regulating valve according to whether the re-acquired actual measurement values of the safety indexes are all in a standard range until the threshold value is determined;
and under the condition that the target opening is greater than or equal to the threshold value, regulating the medium-pressure speed regulating valve to the target opening to regulate the flow rate of steam entering the medium-pressure cylinder so as to regulate the flow rate of medium-pressure steam of a medium-pressure heat supply pipeline, wherein the medium-pressure heat supply pipeline is connected with the medium-pressure steam conveying pipeline.
2. The medium-pressure heat supply method as set forth in claim 1, wherein determining to increase or decrease the opening of the medium-pressure speed regulating valve according to whether the obtained actual measurement values of the safety indexes are all within a standard range, specifically includes:
reducing the opening of the medium-pressure speed regulating valve under the condition that the obtained actual measurement values of all the safety indexes are in the standard range; or alternatively, the first and second heat exchangers may be,
and increasing the opening degree of the medium-pressure speed regulating valve under the condition that the measured value of one or more safety indexes exceeds the standard range.
3. Medium pressure heating method according to claim 1, characterized in that the obtaining of the actual measurement of at least one safety index of the steam turbine comprises:
and obtaining an actual measurement value of at least one safety index of the steam turbine in a real-time monitoring mode.
4. Medium pressure heating method according to claim 1, characterized in that the obtaining of the actual measurement of at least one safety index of the steam turbine comprises:
and obtaining the actual measurement value of the vibration amplitude and/or the bearing temperature of the bearing of the steam turbine.
5. A medium pressure heating method as in claim 1, further comprising: and under the condition that the target opening is smaller than the threshold value, adjusting the opening of the medium-pressure speed regulating valve to the threshold value.
6. A control device, characterized in that the control device comprises: the device comprises a target opening determining module, a judging module, a threshold determining module and an adjusting module, wherein:
the target opening determining module is used for determining the target opening of a medium-pressure speed regulating valve through the medium-pressure steam demand of a heat supply demand party, wherein the medium-pressure speed regulating valve is arranged in a medium-pressure steam conveying pipeline and is used for regulating the medium-pressure steam flow rate entering a medium-pressure cylinder of a steam turbine, medium-pressure steam inlets are formed in the top and the bottom of the medium-pressure cylinder of the steam turbine, a medium-pressure steam outlet of a boiler is connected with two medium-pressure steam inlets of the medium-pressure cylinder through the medium-pressure steam conveying pipeline, the medium-pressure speed regulating valves are respectively arranged on pipelines, close to the top and the bottom of the medium-pressure cylinder of the steam turbine, of the medium-pressure steam conveying pipeline, and the opening of the two medium-pressure speed regulating valves is the same;
the judging module is used for judging whether the target opening is larger than or equal to a threshold value of the opening of the medium-pressure speed regulating valve; wherein the threshold is determined in advance by testing the turbine;
the threshold value determining module is used for acquiring an actual measurement value of at least one safety index of the steam turbine under the current opening of the medium-pressure speed regulating valve; determining to increase or decrease the opening of the medium-pressure speed regulating valve according to whether the obtained actual measurement values of all the safety indexes are in the standard range; re-acquiring the actual measurement value of at least one safety index of the steam turbine, and re-determining to increase or decrease the opening of the medium-pressure speed regulating valve according to whether the re-acquired actual measurement values of the safety indexes are all in a standard range until the threshold value is determined;
and the adjusting module is used for adjusting the medium-pressure speed adjusting valve to the target opening degree to adjust the flow rate of steam entering the medium-pressure cylinder so as to adjust the medium-pressure steam flow rate of the medium-pressure heat supply pipeline under the condition that the target opening degree is larger than or equal to the threshold value, wherein the medium-pressure heat supply pipeline is connected with the medium-pressure steam conveying pipeline.
7. The control device according to claim 6, characterized in that the control device further comprises: and the second adjusting module is used for adjusting the opening of the medium-pressure speed regulating valve to the threshold value under the condition that the target opening is smaller than the threshold value.
8. A medium pressure heating system, comprising: steam turbine, boiler, middling pressure steam delivery pipeline, middling pressure heating pipeline and controlling means that are provided with the middling pressure jar, wherein:
the medium pressure steam outlet of the boiler is connected with two medium pressure steam inlets close to the top and the bottom of the medium pressure cylinder through medium pressure steam conveying pipelines, medium pressure speed regulating valves are respectively arranged on the pipelines close to the top and the bottom of the medium pressure cylinder of the steam turbine, and the opening degrees of the two medium pressure speed regulating valves are the same, wherein the medium pressure speed regulating valves are used for regulating the flow rate of medium pressure steam entering the medium pressure cylinder;
the medium-pressure heat supply pipeline is connected with the medium-pressure steam conveying pipeline; the method comprises the steps of,
the control device includes: the device comprises a target opening determining module, a judging module and an adjusting module, wherein: the target opening determining module is used for determining the target opening of the medium-pressure speed regulating valve through the medium-pressure steam demand of the heat supply demand party; the judging module is used for judging whether the target opening is larger than or equal to a threshold value of the opening of the medium-pressure speed regulating valve; wherein the threshold is determined in advance by testing the turbine;
the threshold value determining module is used for acquiring an actual measurement value of at least one safety index of the steam turbine under the current opening of the medium-pressure speed regulating valve; determining to increase or decrease the opening of the medium-pressure speed regulating valve according to whether the obtained actual measurement values of all the safety indexes are in the standard range; re-acquiring the actual measurement value of at least one safety index of the steam turbine, and re-determining to increase or decrease the opening of the medium-pressure speed regulating valve according to whether the re-acquired actual measurement values of the safety indexes are all in a standard range until the threshold value is determined;
and the adjusting module is used for adjusting the medium-pressure speed regulating valve to the target opening degree to adjust the flow rate of steam entering the medium-pressure cylinder so as to adjust the flow rate of medium-pressure steam of the medium-pressure heat supply pipeline under the condition that the target opening degree is larger than or equal to the threshold value.
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