CN114440655A - Circulating water flow regulating system of double-backpressure steam turbine condenser - Google Patents
Circulating water flow regulating system of double-backpressure steam turbine condenser Download PDFInfo
- Publication number
- CN114440655A CN114440655A CN202111316041.8A CN202111316041A CN114440655A CN 114440655 A CN114440655 A CN 114440655A CN 202111316041 A CN202111316041 A CN 202111316041A CN 114440655 A CN114440655 A CN 114440655A
- Authority
- CN
- China
- Prior art keywords
- circulating water
- water pump
- generating unit
- condenser
- flow
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 224
- 230000001105 regulatory effect Effects 0.000 title claims abstract description 53
- 239000003245 coal Substances 0.000 claims abstract description 56
- 230000033228 biological regulation Effects 0.000 claims abstract description 9
- 230000005611 electricity Effects 0.000 claims abstract description 9
- 238000004364 calculation method Methods 0.000 claims description 19
- 230000008859 change Effects 0.000 claims description 18
- 230000001276 controlling effect Effects 0.000 claims description 11
- 230000003247 decreasing effect Effects 0.000 claims description 11
- 238000010998 test method Methods 0.000 claims description 10
- 230000009977 dual effect Effects 0.000 claims description 3
- 238000004134 energy conservation Methods 0.000 abstract description 2
- 238000012360 testing method Methods 0.000 description 9
- 238000000034 method Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 7
- 239000000498 cooling water Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000009833 condensation Methods 0.000 description 3
- 230000005494 condensation Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 239000002826 coolant Substances 0.000 description 2
- 238000009834 vaporization Methods 0.000 description 2
- 230000008016 vaporization Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B11/00—Controlling arrangements with features specially adapted for condensers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/32—Collecting of condensation water; Drainage ; Removing solid particles
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B9/00—Auxiliary systems, arrangements, or devices
- F28B9/04—Auxiliary systems, arrangements, or devices for feeding, collecting, and storing cooling water or other cooling liquid
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
- Control Of Turbines (AREA)
Abstract
The invention provides a circulating water flow regulating system of a double-backpressure steam turbine condenser, which belongs to the technical field of energy conservation of a steam turbine and comprises a temperature rise generating unit, an end difference generating unit, a flow regulating assembly, a backpressure generating unit, a coal consumption generating unit, an electricity consumption generating unit and a controller. The double-backpressure steam turbine condenser circulating water flow regulating system provided by the invention realizes automatic regulation of the circulating water flow of the steam turbine generator unit condenser, maintains the circulating water flow to operate at the optimal value, and simultaneously reduces the labor intensity of operators.
Description
Technical Field
The invention belongs to the technical field of energy conservation of a steam turbine, and particularly relates to a circulating water flow regulating system of a condenser of a double-backpressure steam turbine.
Background
The condenser is a heat exchanger for condensing the exhaust steam of the steam turbine into water, is one of important auxiliary machines of the steam turbine, and plays a role of a cold source in the steam turbine generator unit from the thermodynamic perspective. The condenser is divided into a water-cooled type and an air-cooled type, water is used as a cooling medium, namely circulating water is used as the cooling medium, exhaust steam of a turbine is condensed and latent heat of vaporization released during steam condensation is taken away, in order to enable the steam condensation process to be continuously carried out, the cooling water needs to continuously flow through a cooling pipe under the driving of a circulating pump (a circulating water pump) and absorb the latent heat of vaporization released by the steam condensation, and the circulating pump is of a variable frequency type. In the process, the cooling water consumption is large, the back pressure of the steam turbine is reduced, the heat consumption rate can be reduced, but the power consumption of the circulating water pump is increased, and the heat exchange effect is good; on the contrary, when the consumption of cooling water is reduced, the power consumption of the circulating water pump is reduced, but the heat exchange effect is poor. At present, cooling water flow is mostly adjusted by operators according to experience, an optimal value is difficult to find, cooling water or circulating water flow can not be guaranteed to operate at the optimal value all the time, and the energy-saving advantage of the variable-frequency circulating water pump can not be fully exerted.
Disclosure of Invention
The invention aims to provide a circulating water flow regulating system of a double-backpressure steam turbine condenser, which aims to realize automatic regulation of the circulating water flow of the steam turbine generator unit condenser, maintain the circulating water flow to operate at an optimal value and reduce the labor intensity of operators.
In order to achieve the purpose, the invention adopts the technical scheme that: the utility model provides a two backpressure steam turbine condenser circulating water flow governing systems, includes:
the temperature rise generating unit is arranged on the condenser and used for calculating the temperature rise of circulating water of the condenser under the heat load and calculating the temperature rise of the circulating water pump after the circulating water pump is increased or reduced;
the end difference generating unit is arranged on the condenser and used for calculating the end difference of the condenser under the heat load and calculating the end difference of the circulating water pump after the circulating water pump is increased or reduced;
the flow regulating assembly is arranged on the circulating water pump and used for increasing or reducing the circulating water flow of the circulating water pump, and after the flow regulating assembly regulates the circulating water pump flow, the temperature rise generating unit and the end difference generating unit calculate the temperature rise of the circulating water and the end difference of the condenser again;
the backpressure generating unit is used for calculating the backpressure variable quantity of the condenser after the flow of the circulating water is increased or reduced;
the coal consumption generating unit is used for calculating the coal consumption reduced or increased by the steam turbine after the circulating water flow is increased or reduced;
the power consumption generating unit is used for calculating the increased or decreased power consumption of the circulating water pump after the circulating water flow is increased or decreased; and
the controller is suitable for receiving the information of the temperature rise generating unit, the end difference generating unit, the back pressure generating unit, the coal consumption generating unit and the power consumption generating unit, comparing the coal consumption and the power consumption under the current rotating speed of the circulating water pump with the calculated coal consumption and the power consumption after being increased or reduced, determining the rotating speed of the circulating water pump after being increased or reduced, and controlling the flow regulating assembly to operate by a rotating speed regulating instruction; completing one calculation period, automatically entering the next calculation period, and forming a rotating speed control instruction of the circulating water pump by comparing the coal consumption and the power consumption in real time;
when the rotating speed instruction of the circulating water pump with adjustable rotating speed reaches more than 95%, the controller calculates whether the economy of starting one more circulating water pump is improved or not so as to determine whether one more circulating water pump is started or not, and information is pushed to an operator on duty; and if the rotating speed instruction of the circulating water pump reaches below 5%, calculating whether the economy of one circulating water pump is improved by the controller so as to determine whether the circulating water pump is stopped, and pushing information to an operator on duty.
In a possible implementation, the double back pressure turbine condenser circulating water flow regulating system further comprises:
the first curve generating unit is used for acquiring a function curve relation between the rotating speed and the flow of the circulating water pump and acquiring a function curve relation between the rotating speed and the power consumption of the circulating water pump through a test method, and the controller is used for controlling the flow regulating assembly to operate according to the curve generated by the first curve generating unit.
In one possible implementation, the system for regulating the flow of the circulating water of the condenser of the double back pressure turbine further comprises:
and the second curve generation unit is used for acquiring a functional relation between the backpressure variation of the condenser and the coal consumption variation of the steam turbine by a thermal test method, and the controller is used for controlling the flow regulation assembly to operate according to the curve generated by the second curve generation unit.
In a possible implementation manner, real-time performance calculation software is arranged in the controller, the influence of the increase or decrease of the circulating water flow on the coal consumption and the electricity consumption is calculated in real time through the real-time performance calculation software, the rotation speed of the circulating water pump is determined to be increased or decreased, and a rotation speed control instruction is output to the controller to serve as an instruction for automatically adjusting the circulating water flow.
In a possible implementation manner, the flow regulating assembly comprises a rotating speed regulator arranged on the circulating water pump, the rotating speed regulator is used for increasing or decreasing the rotating speed of the circulating water pump so as to control the flow rate of circulating water, and the rotating speed regulator is controlled by the controller;
the rotating speed regulator is provided with a limiting assembly for limiting the adjusting range of the circulating water flow, and the limiting flow range of the limiting assembly is adjustable.
In a possible implementation manner, the coal consumption generating unit is configured to obtain a functional relationship between a condenser backpressure variation and a turbine coal consumption variation through a thermodynamic test method, divide an obtained heat consumption-backpressure relationship curve into three curves including a 2-valve curve, a 3-valve curve and a 4-valve curve according to a turbine high throttle state, and select different curves for calculation according to different working conditions of the turbine high throttle state when calculating the coal consumption, so as to improve calculation accuracy.
In a possible implementation manner, the condenser is a double-backpressure condenser, the backpressure of the high-backpressure condenser and the backpressure of the low-backpressure condenser are respectively calculated, the calculation result of the backpressure generation unit is pushed to the coal consumption generation unit so as to respectively calculate the influence on the coal consumption, and the backpressure of the condenser after the flow of the circulating water is adjusted is obtained by calculating the temperature rise and the end difference generated by the temperature rise generation unit and the end difference generation unit.
In one possible implementation mode, the start-stop instruction of the circulating water pump is obtained by real-time calculation of the controller;
a circulating water pump starting and stopping instruction generating unit is arranged in the controller, when the rotating speed instruction of the circulating water pump with adjustable rotating speed reaches more than 95%, the controller calculates the temperature rise and the end difference change of circulating water after starting more circulating water pumps, calculates the back pressure and the pressure change of the condenser, obtains the change results of coal consumption and power consumption, determines whether the economical efficiency is improved or not, determines whether more circulating water pumps are started or not, and pushes information to a DCS system operator station to inform an operator on duty;
and if the rotating speed instruction of the circulating water pump reaches below 5%, calculating the temperature rise and the end difference change of the circulating water after one circulating water pump is stopped by the controller, calculating the backpressure change of the condenser, obtaining the change results of coal consumption and power consumption, determining whether the economy is improved, determining whether one circulating water pump should be stopped, and pushing information to a DCS operator station to inform an operator on duty.
In a possible implementation manner, the controller includes a DCS control system, and an analysis and judgment module is built in the DCS control system, and the analysis and judgment module is configured to analyze and judge the operation time, the frequency, and the adjustment amount of the circulating water pump controlled by the flow adjustment component.
The double-backpressure steam turbine condenser circulating water flow regulating system provided by the invention has the beneficial effects that: compared with the prior art, the circulating water flow regulating system of the double-backpressure steam turbine condenser calculates the temperature rise of circulating water of the condenser under heat load through the temperature rise generating unit, calculates the end difference of the condenser under heat load through the end difference generating unit, increases or reduces the circulating water flow of the circulating water pump through the flow regulating assembly, after the flow regulating assembly regulates the circulating water pump flow, the temperature rise generating unit and the end difference generating unit calculate the temperature rise of the circulating water and the end difference of the condenser again, calculates the back pressure variable quantity of the condenser after the circulating water flow is increased or reduced through the back pressure generating unit, calculates the coal consumption of the steam turbine after the circulating water flow is increased or reduced through the coal consumption generating unit, calculates the increased or reduced electricity consumption of the circulating water pump after the circulating water flow is increased or reduced through the electricity consumption generating unit, and receives the temperature rise generating unit, the back pressure generating unit, the circulating water pump, the temperature rise generating unit, the temperature difference generating unit, the back pressure generating unit, the temperature difference, The end difference generating unit, the backpressure generating unit, the coal consumption generating unit and the power consumption generating unit are used for controlling the flow regulating assembly to operate, so that the automatic regulation of the circulating water flow of the condenser of the turbo generator unit is realized, the circulating water flow is maintained to operate at the optimal value, and the labor intensity of operators is reduced.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a double back pressure turbine condenser circulating water flow rate regulating system provided in an embodiment of the present invention (dotted arrows in the diagram indicate a sequence or a direction);
FIG. 2 is a diagram of the corresponding function relationship between the rotating speed and the flow rate of the variable frequency circulating water pump obtained by field tests, wherein a double pump is adopted;
FIG. 3 is a functional relationship diagram of the rotating speed of the variable frequency circulating water pump and the power consumption of the variable frequency circulating water pump obtained through field tests;
FIG. 4 is a diagram showing the relationship between the variation (Kpa) of the back pressure of the condenser and the variation (Kpa) of the heat consumption of the turbine according to the present invention;
fig. 5a to 5d are setting modes of a circulating water flow regulating system of a double back pressure turbine condenser provided by an embodiment of the invention in a specific application process;
fig. 6a to 6c are start and stop logics of a circulating water pump of a circulating water flow regulating system of a double back pressure turbine condenser provided in an embodiment of the present invention;
fig. 7 is a flowchart of a circulating water flow rate regulating system of a double back pressure turbine condenser provided by an embodiment of the invention in a field practical application process.
Description of the reference numerals:
1. a temperature rise generating unit; 2. a terminal difference generation unit; 3. a flow regulating assembly; 4. a back pressure generating unit; 5. a coal consumption generating unit; 6. a power consumption generation unit; 7. a controller; 8. a first curve generation unit; 9. A second curve generation unit.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, a circulating water flow rate regulating system of a condenser of a double back pressure turbine according to the present invention will be described. The circulating water flow regulating system of the double-backpressure steam turbine condenser comprises a temperature rise generating unit 1, an end difference generating unit 2, a flow regulating assembly 3, a backpressure generating unit 4, a coal consumption generating unit 5, an electricity consumption generating unit 6 and a controller 7, wherein the temperature rise generating unit 1 is arranged on the condenser and used for calculating the temperature rise of circulating water of the condenser under heat load and calculating the temperature rise of a circulating water pump after the circulating water pump is increased or reduced; the end difference generating unit 2 is arranged on the condenser and used for calculating the end difference of the condenser under the heat load and calculating the end difference of the circulating water pump after the circulating water pump is increased or decreased; the flow regulating component 3 is arranged on the circulating water pump and used for increasing or reducing the circulating water flow of the circulating water pump, and after the flow regulating component 3 regulates the circulating water pump flow, the temperature rise generating unit 1 and the end difference generating unit 2 calculate the temperature rise of the circulating water and the end difference of the condenser again; the backpressure generating unit 4 is used for calculating the backpressure variable quantity of the condenser after the circulating water flow is regulated to be high or reduced; the coal consumption generating unit 5 is used for calculating the coal consumption reduced or increased by the turbine after the circulating water flow is adjusted to be high or reduced; the power consumption generating unit 6 is used for calculating the increased or decreased power consumption of the circulating water pump after the circulating water flow is increased or decreased; the controller 7 is suitable for receiving information of the temperature rise generating unit 1, the end difference generating unit 2, the back pressure generating unit 4, the coal consumption generating unit 5 and the power consumption generating unit 6, comparing the coal consumption and the power consumption under the current rotating speed of the circulating water pump with the calculated coal consumption and the power consumption after being increased or reduced, determining the rotating speed of the circulating water pump after being increased or reduced, and controlling the flow regulating assembly 3 to operate by a rotating speed regulating instruction; completing one calculation period, automatically entering the next calculation period, and forming a rotating speed control instruction of the circulating water pump by comparing the coal consumption and the power consumption in real time;
a circulating water pump starting and stopping instruction generating unit is arranged in the controller 7, when the rotating speed instruction of the circulating water pump with adjustable rotating speed reaches more than 95%, the controller 7 calculates whether the economy of starting more than one circulating water pump is improved or not so as to determine whether more than one circulating water pump is started or not, and information is pushed to an operator on duty; and if the rotating speed instruction of the circulating water pump reaches below 5%, calculating whether the economy of one circulating water pump is improved by the controller 7 so as to determine whether the circulating water pump is stopped, and pushing information to an operator on duty.
Compared with the prior art, the circulating water flow regulating system of the double-backpressure steam turbine condenser calculates the temperature rise of circulating water of the condenser under a heat load through the temperature rise generating unit 1, calculates the end difference of the condenser under the heat load through the end difference generating unit 2, increases or reduces the circulating water flow of the circulating water pump through the flow regulating component 3, after the flow regulating component 3 regulates the circulating water pump flow, the temperature rise generating unit 1 and the end difference generating unit 2 calculate the temperature rise of the circulating water and the end difference of the condenser again, calculates the backpressure variable quantity of the condenser after the circulating water flow is increased or reduced through the backpressure generating unit 4, calculates the coal consumption of the turbine after the circulating water flow is increased or reduced through the coal consumption generating unit 5, calculates the electricity consumption of the circulating water pump after the circulating water flow is increased or reduced through the electricity consumption generating unit 6, the controller 7 is used for receiving the information of the temperature rise generating unit 1, the end difference generating unit 2, the backpressure generating unit 4, the coal consumption generating unit 5 and the power consumption generating unit 6 and controlling the flow regulating component 3 to operate, so that the automatic regulation of the circulating water flow of the condenser of the turbo generator set is realized, the energy consumption of the unit is reduced, the economy is improved, the operation of the circulating water flow at the optimal value is maintained, the labor intensity of operators is reduced, and the workload of the manual regulation of the circulating water flow of the operators is reduced by more than 90%.
In some embodiments, referring to fig. 1, the double back pressure turbine condenser circulating water flow rate regulating system further includes a first curve generating unit 8, the first curve generating unit 8 is configured to obtain a functional curve relationship between a rotating speed and a flow rate of the circulating water pump and a functional curve relationship between a rotating speed and a power consumption of the circulating water pump through a test method, and the controller 7 is configured to control the flow rate regulating assembly 3 to operate according to a curve generated by the first curve generating unit 8.
In some embodiments, referring to fig. 1, the double back pressure turbine condenser circulating water flow rate adjusting system further includes a second curve generating unit 9, the second curve generating unit 9 is configured to obtain a functional relationship between a condenser back pressure variation and a turbine coal consumption variation through a thermodynamic test, and the controller 7 is configured to control the flow rate adjusting assembly 3 to operate according to a curve generated by the second curve generating unit 9. The above-mentioned passing test method and passing thermal test method are both obtained by means of tests, and particularly what kind of tests are available in the prior art, and are not described herein again.
The first curve generating unit 8 and the second curve generating unit 9 are both curve generating units in the prior art, and the optimal value of the circulating water flow of the circulating water pump can be judged through the produced curves, so that the coal consumption is low, the power consumption is low, the optimal range is maintained, and the cost is reduced.
In some embodiments, referring to fig. 1, real-time performance calculation software is embedded in the controller 7, the real-time performance calculation software calculates the influence on the coal consumption and the electricity consumption after the circulation water flow is increased or decreased in real time, determines to increase or decrease the rotation speed of the circulation water pump, and outputs a rotation speed control instruction to the controller 7 as an instruction for automatically adjusting the circulation water flow.
Specifically, the real-time performance calculation software is a real-time performance calculation software frequently used in the prior art, such as GPA, the usage steps and the operation principle of the real-time performance calculation software are not limited in this embodiment, and the real-time performance calculation software can be directly used after the prior art is selected, and the software can analyze and obtain the optimal value of the circulating water flow, so that the water flow of the circulating water pump is always maintained at the optimal value.
In some embodiments, referring to fig. 1, the flow rate adjusting assembly 3 includes a speed regulator disposed on the circulating water pump, the speed regulator is used for increasing or decreasing the speed of the circulating water pump to control the flow rate of the circulating water, and the speed regulator is controlled by the controller 7; the rotating speed regulator is provided with a limiting assembly for limiting the circulating water flow regulating range, and the limiting flow range of the limiting assembly is adjustable.
Specifically, the speed regulator is a power frequency regulating device, the frequency of the speed regulator can be regulated and controlled by a controller, a control button is arranged on the controller, the size of an output instruction of the speed regulator can be controlled by operating the control button, and then the effect of controlling the circulating water flow of the circulating water pump is achieved.
The limiting component is a water flow limiter, is a product in the prior art, and can limit water flow.
In some embodiments, referring to fig. 1, the coal consumption generating unit 5 is configured to obtain a functional relationship between a condenser back pressure variation and a turbine coal consumption variation by a thermal test method, divide an obtained heat consumption-back pressure relationship curve into three curves including a 2-valve curve, a 3-valve curve and a 4-valve curve according to a turbine high throttle state, and select different curves for calculation according to different working conditions of the turbine high throttle state when calculating the coal consumption, so as to improve calculation accuracy.
In some embodiments, referring to fig. 1, the condenser is a dual back pressure condenser, back pressures of the high back pressure condenser and the low back pressure condenser are respectively calculated, the calculation result of the back pressure generation unit 4 is pushed to the coal consumption generation unit 5 to respectively calculate the influence on the coal consumption, and the back pressure of the condenser after the flow rate of the circulating water is adjusted is obtained by calculating the temperature rise and the end difference generated by the temperature rise generation unit 1 and the end difference generation unit 2.
In some embodiments, referring to fig. 1, the start/stop instruction of the circulating water pump is obtained by real-time calculation of the controller 7;
a circulating water pump starting and stopping instruction generating unit is arranged in the controller 7, when the rotating speed instruction of the circulating water pump with adjustable rotating speed reaches more than 95%, the controller 7 calculates the temperature rise and the end difference change of circulating water after starting more circulating water pumps, calculates the back pressure and the pressure change of the condenser, obtains the change results of coal consumption and power consumption, determines whether the economy is improved or not, determines whether more circulating water pumps are started or not, and pushes information to a DCS system operator station to inform an operator on duty;
and if the rotating speed instruction of the circulating water pump reaches below 5%, calculating the temperature rise and the end difference change of the circulating water after one circulating water pump is stopped by the controller 7, calculating the backpressure change of the condenser, obtaining the change results of coal consumption and power consumption, determining whether the economy is improved, determining whether one circulating water pump is stopped to be operated, and pushing information to a DCS operator station to inform an operator on duty.
In some embodiments, referring to fig. 1, the controller 7 includes a DCS control system, and an analysis and judgment module is built in the DCS control system, and the analysis and judgment module is used to analyze and judge the operation time, frequency, and adjustment amount of the circulating water pump controlled by the flow adjustment component 3. The DCS control system is a common controller or control system in the prior art, and can directly adopt the prior art, wherein the DCS control system can be externally connected with a control module or a control unit so as to achieve the purpose of controlling simultaneously with the DCS control system. The heat loss may be referred to as coal loss.
In the double-backpressure steam turbine generator set, 3 circulating water pumps are provided, wherein 2 power frequencies and 1 frequency converter are adopted, and the frequency conversion range is as follows: 2 runs are at 346-493 rpm; the 3 runs were 361-. If the system is used for a single backpressure unit, 2 circulating water pumps are used, and the system can be realized through a simplified system. The start and stop judgment of the circulating water pump can also be used for a system using 2 circulating water pumps. The performance curve of the circulating water pump, the power consumption curve of the circulating water pump and the back pressure-heat consumption curve need to be obtained by tests or provided by equipment manufacturers. Fig. 5a to 5d are arrangement modes of the present invention in a specific application process, and the following circulating pump and variable frequency pump are both circulating water pumps. Fig. 6a to 6c show the start and stop logic of the circulating water pump of the present invention.
In the field practical application process, the following functional relationship is obtained through experiments:
1) the corresponding functional relation between the rotating speed and the flow of the variable-frequency circulating water pump is obtained through field tests and is shown in figure 2;
2) the functional relation between the rotating speed of the variable-frequency circulating water pump and the power consumption of the variable-frequency circulating water pump is obtained through field tests and is shown in figure 3;
3) the relationship between the variation (Kpa) of the back pressure of the condenser and the variation (unit%) of the heat consumption of the turbine is shown in FIG. 4;
triple valve: y-4.25335 e-04 x5+7.29772e-03x4-4.4339e-02x3+1.26714e-01x2+8.10876e-01x
Two valves: y-1.04049 e-03 x5+1.744452e-02x4-1.02405e-01x3+2.53099e-01x2+9.76015e-01x
4) Installing real-time performance calculation software GPA in the DCS control system, and carrying out logic configuration according to a flow chart.
1. The GPA obtains real-time data from DCS in an OPC mode, and mainly reads the inlet temperature t1a and the outlet temperature t2a of circulating water of the A condenser; the inlet temperature t1B and the outlet temperature t2B of the circulating water of the condenser B; the temperature of the discharged steam on the condenser side A, the temperature of the discharged steam on the condenser side B, the rotating speed of the variable-frequency circulating water pump and the current unit load.
2. And the GPA reads the real data of the DCS, and outputs the optimized rotating speed of a circulating water pump for automatic adjustment of the variable-frequency circulating water pump after logic operation. The output rotation speed command is output to the DCS through the OPC.
Fig. 7 is a flow chart of the field practical application process of the invention.
5) Alternatively, the GPA software may be programmed by VB, VC, C # and other programming software to implement the logic algorithm in the flowchart.
The OPC software must adopt software matched with the DCS, namely software carried by the DCS. Thus, stable and reliable data communication can be realized.
6) When the two pumps are operated and the rotating speed of the variable frequency pump reaches more than 493 through calculation, the third pump is prompted to be started when the three pumps are operated and the yield is positive when the rotating speed reaches 361 revolutions.
The benefit of the rotation speed 361 of the variable frequency pump is calculated, and tests show that when three variable frequency pumps run and the rotation speed of the variable frequency pump reaches over 361 revolutions, the flow of circulating water begins to rise compared with that when two variable frequency pumps run at full revolutions.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. Two backpressure steam turbine condenser circulating water flow governing system, its characterized in that includes:
the temperature rise generating unit is arranged on the condenser and used for calculating the temperature rise of circulating water of the condenser under the heat load and calculating the temperature rise of the circulating water pump after the circulating water pump is increased or reduced;
the end difference generating unit is arranged on the condenser and used for calculating the end difference of the condenser under the heat load and calculating the end difference of the circulating water pump after the circulating water pump is increased or reduced;
the flow regulating assembly is arranged on the circulating water pump and used for increasing or reducing the circulating water flow of the circulating water pump, and after the flow regulating assembly regulates the circulating water pump flow, the temperature rise generating unit and the end difference generating unit calculate the temperature rise of the circulating water and the end difference of the condenser again;
the back pressure generating unit is used for calculating the back pressure variable quantity of the condenser after the circulating water flow is increased or reduced;
the coal consumption generating unit is used for calculating the coal consumption reduced or increased by the steam turbine after the flow of the circulating water is increased or reduced;
the power consumption generating unit is used for calculating the increased or decreased power consumption of the circulating water pump after the circulating water flow is increased or decreased; and
the controller is suitable for receiving the information of the temperature rise generating unit, the end difference generating unit, the back pressure generating unit, the coal consumption generating unit and the power consumption generating unit, comparing the coal consumption and the power consumption under the current rotating speed of the circulating water pump with the calculated coal consumption and the power consumption after being increased or reduced, determining the rotating speed of the circulating water pump after being increased or reduced, and controlling the flow regulating assembly to operate by a rotating speed regulating instruction; completing one calculation period, automatically entering the next calculation period, and forming a rotating speed control instruction of the circulating water pump by comparing coal consumption and power consumption in real time;
the controller is internally provided with a circulating water pump starting and stopping instruction generating unit, when the rotating speed instruction of the circulating water pump with adjustable rotating speed reaches more than 95%, the controller calculates whether the economy of starting more than one circulating water pump is improved or not so as to determine whether more than one circulating water pump is started or not, and information is pushed to an operator on duty; and if the rotating speed instruction of the circulating water pump reaches below 5%, calculating whether the economy of one circulating water pump is improved by the controller so as to determine whether the circulating water pump is stopped, and pushing information to an operator on duty.
2. The system of claim 1, further comprising:
the first curve generating unit is used for acquiring a function curve relation between the rotating speed and the flow of the circulating water pump and acquiring a function curve relation between the rotating speed and the power consumption of the circulating water pump through a test method, and the controller is used for controlling the flow regulating assembly to operate according to the curve generated by the first curve generating unit.
3. The system of claim 1, further comprising:
and the second curve generation unit is used for acquiring a functional relation between the backpressure variation of the condenser and the coal consumption variation of the steam turbine by a thermal test method, and the controller is used for controlling the flow regulation assembly to operate according to the curve generated by the second curve generation unit.
4. The system for regulating the flow of circulating water of a condenser of a double back pressure turbine as claimed in claim 1, wherein a real-time performance calculating software is built in the controller, the real-time performance calculating software calculates the influence of the increase or decrease of the flow of circulating water on the coal consumption and the electricity consumption in real time, determines to increase or decrease the rotating speed of the circulating water pump, and outputs a rotating speed control command to the controller as a command for automatically regulating the flow of circulating water.
5. The system according to claim 1, wherein the flow regulating assembly comprises a speed regulator disposed on the circulating water pump, the speed regulator being configured to increase or decrease a speed of the circulating water pump to control a flow rate of the circulating water, the speed regulator being controlled by the controller;
the rotating speed regulator is provided with a limiting assembly for limiting the circulating water flow regulating range, and the limiting flow range of the limiting assembly is adjustable.
6. The system for regulating the flow of circulating water of a condenser of a dual back pressure turbine as claimed in claim 1, wherein the coal consumption generating unit is configured to obtain a functional relationship between the variation of the back pressure of the condenser and the variation of the coal consumption of the turbine by a thermodynamic test method, obtain a heat consumption-back pressure relationship curve which is divided into three curves including 2 valves, 3 valves and 4 valves according to the high throttle state of the turbine, and select different curves for calculation according to different conditions of the high throttle state of the turbine when calculating the coal consumption, so as to improve the calculation accuracy.
7. The system according to claim 1, wherein the condenser is a dual back pressure condenser, back pressures of the high back pressure condenser and the low back pressure condenser are calculated respectively, the back pressure generating unit sends the calculation result to the coal consumption generating unit to calculate the influence on the coal consumption respectively, and the back pressure of the condenser after the flow of the circulating water is adjusted is obtained by calculating the temperature rise and the end difference generated by the temperature rise generating unit and the end difference generating unit.
8. The system for regulating the flow of circulating water of a condenser of a double back pressure turbine as claimed in claim 1, wherein a circulating water pump start-stop instruction is obtained by real-time calculation of the controller;
a circulating water pump starting and stopping instruction generating unit is arranged in the controller, when the rotating speed instruction of the circulating water pump with adjustable rotating speed reaches more than 95%, the controller calculates the temperature rise and the end difference change of circulating water after starting more circulating water pumps, calculates the back pressure and the pressure change of the condenser, obtains the change results of coal consumption and power consumption, determines whether the economical efficiency is improved or not, determines whether more circulating water pumps are started or not, and pushes information to a DCS system operator station to inform an operator on duty;
and if the rotating speed instruction of the circulating water pump reaches below 5%, calculating the temperature rise and the end difference change of the circulating water after one circulating water pump is stopped by the controller, calculating the backpressure change of the condenser, obtaining the change results of coal consumption and power consumption, determining whether the economy is improved, determining whether one circulating water pump is stopped to be operated, and pushing information to a DCS operator station to inform an operator on duty.
9. The system of claim 1, wherein the controller comprises a DCS control system with an analysis and judgment module built therein, and the analysis and judgment module is used for analyzing and judging the operation time, frequency and regulation amount of the circulating water pump controlled by the flow regulation component.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111316041.8A CN114440655B (en) | 2021-11-08 | 2021-11-08 | Circulating water flow regulating system of condenser of double back pressure turbine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111316041.8A CN114440655B (en) | 2021-11-08 | 2021-11-08 | Circulating water flow regulating system of condenser of double back pressure turbine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114440655A true CN114440655A (en) | 2022-05-06 |
| CN114440655B CN114440655B (en) | 2024-02-27 |
Family
ID=81363196
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111316041.8A Active CN114440655B (en) | 2021-11-08 | 2021-11-08 | Circulating water flow regulating system of condenser of double back pressure turbine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114440655B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103063354A (en) * | 2012-12-28 | 2013-04-24 | 安徽省电力科学研究院 | Confirming method for turbine standard backpressure in thermal power generating unit energy consumption assessment and coal consumption check test |
| CN103216282A (en) * | 2013-04-24 | 2013-07-24 | 华北电力大学 | Thermal power generating unit loading control system and method based on continuously adjustable back pressure |
| CN105569748A (en) * | 2014-10-31 | 2016-05-11 | 王砧 | Operation back pressure continuous optimized control method and system for wet cooling steam turbine |
| CN105865220A (en) * | 2016-05-26 | 2016-08-17 | 中国大唐集团科学技术研究院有限公司华东分公司 | Double backpressure condenser optimized operation device and operation method thereof |
| CN206269616U (en) * | 2016-11-23 | 2017-06-20 | 山东电力研究院 | A kind of system for controlling the double pressure condenser circulating water flows of steam turbine |
| KR20170076060A (en) * | 2015-12-24 | 2017-07-04 | 김선조 | Coolant flow rate control method for the optimum operation of the vacuum condenser |
| CN110032155A (en) * | 2019-04-12 | 2019-07-19 | 华能国际电力股份有限公司 | Seawater direct current cooling water system operation optimization guidance system of thermal power plant |
-
2021
- 2021-11-08 CN CN202111316041.8A patent/CN114440655B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103063354A (en) * | 2012-12-28 | 2013-04-24 | 安徽省电力科学研究院 | Confirming method for turbine standard backpressure in thermal power generating unit energy consumption assessment and coal consumption check test |
| CN103216282A (en) * | 2013-04-24 | 2013-07-24 | 华北电力大学 | Thermal power generating unit loading control system and method based on continuously adjustable back pressure |
| CN105569748A (en) * | 2014-10-31 | 2016-05-11 | 王砧 | Operation back pressure continuous optimized control method and system for wet cooling steam turbine |
| KR20170076060A (en) * | 2015-12-24 | 2017-07-04 | 김선조 | Coolant flow rate control method for the optimum operation of the vacuum condenser |
| CN105865220A (en) * | 2016-05-26 | 2016-08-17 | 中国大唐集团科学技术研究院有限公司华东分公司 | Double backpressure condenser optimized operation device and operation method thereof |
| CN206269616U (en) * | 2016-11-23 | 2017-06-20 | 山东电力研究院 | A kind of system for controlling the double pressure condenser circulating water flows of steam turbine |
| CN110032155A (en) * | 2019-04-12 | 2019-07-19 | 华能国际电力股份有限公司 | Seawater direct current cooling water system operation optimization guidance system of thermal power plant |
Non-Patent Citations (5)
| Title |
|---|
| 吴玉华;: "水环泵工作水温对双背压机组的影响", no. 04 * |
| 张玉;邵睿;李凌;: "发电机组凝汽器背压的优化计算", 上海理工大学学报, no. 05 * |
| 成渫畏;王学栋;郝玉振;: "高背压供热机组凝汽器高低背压运行的经济指标分析", 山东电力技术, no. 06 * |
| 潘继真;魏海涛;肖国振;: "某沿海电厂600MW机组循环水***运行方式优化试验研究", no. 05 * |
| 赵文升等: "双压凝汽器循环水***优化", vol. 59, no. 59, pages 146 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114440655B (en) | 2024-02-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108091903B (en) | Fuel cell stack thermal management device, system and method | |
| CN102003229B (en) | Control system and method for generating power by waste heat of diesel engine | |
| CN108412558B (en) | Intelligent economic operation system of steam turbine generator unit | |
| CN109539380A (en) | A kind of Teat pump boiler compressor frequency control method | |
| CN109779891B (en) | Method for optimizing backpressure and circulating water quantity of steam turbine generator unit | |
| CN109654887A (en) | A kind of circulating water cooling system and its autocontrol method | |
| CN111397077B (en) | Temperature control method and device, storage medium and air conditioner | |
| CN115823706A (en) | Primary pump self-adaptive variable pressure difference energy-saving control system and method | |
| CN114068985A (en) | Proton exchange membrane fuel cell combined cooling, heating and power system | |
| CN114440655B (en) | Circulating water flow regulating system of condenser of double back pressure turbine | |
| CN115013101B (en) | Coordinated control system of supercritical carbon dioxide generator set | |
| JPH0721362B2 (en) | Waste heat recovery power generator | |
| CN106894854A (en) | The solidifying formula indirect air cooling generating set cold end system running optimizatin method of table | |
| CN110173357A (en) | A kind of cooling heating and power generation system and method | |
| CN216213594U (en) | Proton exchange membrane fuel cell combined cooling, heating and power system | |
| CN210568773U (en) | Energy-saving secondary station heat pump set based on internet | |
| CN211230570U (en) | Generating set backpressure control circulating water system based on circulating water temperature | |
| CN209655821U (en) | A kind of circulating water cooling system | |
| CN113921946A (en) | New energy automobile battery pack heat dissipation control method and system and new energy automobile | |
| CN110821588B (en) | Back pressure control method of generator set based on circulating water temperature and circulating water system | |
| CN112909308A (en) | Temperature control method of fuel cell | |
| CN107942771B (en) | Data center energy supply control system and method | |
| CN111636937A (en) | ORC power generation device with automatic liquid level adjustment function and adjusting method thereof | |
| CN214891511U (en) | Flow regulating device of heat supply unit | |
| CN117053618B (en) | Variable-frequency water chilling unit control system and method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |