CN107420142B - A kind of Turbine Cold Junction optimization progress control method following pump based on frequency conversion - Google Patents
A kind of Turbine Cold Junction optimization progress control method following pump based on frequency conversion Download PDFInfo
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- CN107420142B CN107420142B CN201710339532.1A CN201710339532A CN107420142B CN 107420142 B CN107420142 B CN 107420142B CN 201710339532 A CN201710339532 A CN 201710339532A CN 107420142 B CN107420142 B CN 107420142B
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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
- F01K13/00—General layout or general methods of operation of complete plants
- F01K13/02—Controlling, e.g. stopping or starting
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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
- F01K11/00—Plants characterised by the engines being structurally combined with boilers or condensers
- F01K11/02—Plants characterised by the engines being structurally combined with boilers or condensers the engines being turbines
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Abstract
The invention discloses a kind of Turbine Cold Junctions for following pump based on frequency conversion to optimize progress control method, its step: a, frequency conversion follow revolution speed, voltage, electric current, recirculated water into condenser inlet temperature, steamer electric power as control system input variable and be filtered；B, frequency conversion follows pump voltage and is multiplied to obtain power with electric current, and steamer electric power and its difference are current micro- increasing power；C, the initial value of history library prediction model is calculated using design value, and the model is updated according to the current micro- increasing power of unit；D, the pre- micrometer followed when revolution speed changes is calculated using history library prediction model increases power；E, setting observation window increases power to current and pre- micrometer and exercises supervision；F, setting comparator activates current and pre- micrometer to increase corresponding to the maximum value in power and follows revolution speed, the as output of control system；The present invention can real-time optimization frequency conversion follow the revolving speed of pump so that condenser operates in optimum vacuum always, so that the difference that steamer electric power and frequency conversion follow pump wasted work is maximum.
Description
Technical field
The present invention relates to steam turbine power generation technical field more particularly to a kind of Turbine Cold Junction optimizations that pump is followed based on frequency conversion
Progress control method
Background technique
Promotion with power grid to new energy electric power digestion capability, opposite high energy consumption, the fired power generating unit of maximum discharge must faces
Current demand to depth peak regulation, and the long-term variable load operation of high-power fired power generating unit is also by normalization.To respond national " electric power
Develop " 13 " planning " policy, reaching fired power generating unit coal consumption reduces target, currently, some newly-built fired power generating unit application frequency conversions
Pump or fan is instead of the biggish constant speed pump or fan of power consumption, the especially biggish water circulating pump of power consumption.Although initial cost is higher,
Be frequency conversion follow pump in sub-load power be greatly reduced so that unit energy-saving effect is more outstanding at part load, certain
Accelerate to have recycled initial cost in degree.
Turbo-generator Set run when, for condenser vacuum closer to design value, unit output is bigger, but vacuum raising be with
It is cost that water circulating pump power output, which increases, and especially under summer operating mode, accordingly, there exist optimum vacuums to make steamer electric power
It is maximum with the power difference of water circulating pump consumption.Pump is followed relative to constant speed, frequency conversion follows pump continuously adjustable revolving speed, according to similar fixed
Rule follows the m that pump wasted work reduces to rated power when revolving speed is reduced to the m/mono- of rated speed3/ mono-, thus in part
Energy-saving potential is huge under load.It designs Turbine Cold Junction and optimizes operation control system, it is therefore an objective to adjust follow revolution speed in real time, continuously
Circulating water flow is adjusted, so that condenser is run in optimum vacuum always, so that steamer electric power and water circulating pump consume it
It is poor maximum.
Summary of the invention
It is of the invention it is required solve the problems, such as, be to provide a kind of Turbine Cold Junction optimization operation control that pump is followed based on frequency conversion
Method processed can be realized real-time optimization water circulating pump revolving speed, obtain the optimum vacuum of condenser operation.
To achieve the above object, the technical solution adopted by the present invention is that:
A kind of Turbine Cold Junction optimization progress control method following pump based on frequency conversion, comprising the following steps:
A, acquisition frequency conversion follows revolution speed, frequency conversion follows pump voltage, frequency conversion follow pump electric current, recirculated water into condenser inlet temperature,
Input variable of five variables of steamer electric power as control system, and input variable have passed through filtering, the filtering method: vapour
Taking turns electric power fluctuation to be no more than the mean value of 15MW and maintenance 5 minutes or more all input variables within the period is filtering knot
Fruit enters step B；
B, ignore frequency conversion and follow the variation that pump power factor follows pump wasted work with frequency conversion, pump voltage is followed by frequency conversion and frequency conversion follows pump electricity
Stream multiplication obtains frequency conversion and follows pump wasted work, and steamer electric power and frequency conversion follow the difference of pump wasted work, then divided by steamer electric power and vapour
The ratio of turbine electric rating is current micro- increasing power, enters step C；
C, history library prediction model is set, which is to follow revolution speed and recirculated water into solidifying in input frequency conversion
The model that pre- micrometer increases power is calculated and exported when vapour device inlet temperature；The algorithm of history library prediction model is in 63 nodes
Two-dimensional interpolation is carried out in set, these nodes are to follow revolution speed, recirculated water in frequency conversion to increase function into condenser inlet temperature, pre- micrometer
Known numeric value point in the three-dimensional system of coordinate of rate；The initial value of node follows pump characteristic curve according to the frequency conversion that device manufacturer provides, coagulates
These three design curves calculate to the fair curve of power for vapour device characteristic curve, back pressure；Unit in the process of running, by defeated
The frequency conversion for entering control system follows revolution speed, recirculated water into condenser inlet temperature and by current micro- increasing power of step B calculating
The node for carrying out real-time update history library prediction model, enters step D；
D, it is followed on revolution speed variable value plus the circulation of 1 rev/min and input control system in the frequency conversion of input control system
Water is into condenser inlet temperature variable as independent variable, and interpolation calculation obtains pre- micrometer increasing power ﹢ in history library prediction model；
It is followed on revolution speed variable value in the frequency conversion of input control system and subtracts 1 rev/min and the recirculated water of input control system is into condenser
Inlet temperature variable is as independent variable, and interpolation calculation obtains pre- micrometer increasing power ﹣ in history library prediction model, enters step E；
E, observation window is set, which can store the history library prediction model before more new node each time, and
Power ﹢ is increased to current micro- increasing power, pre- micrometer and pre- micrometer increases this three groups of parameters of power ﹣ and exercises supervision: when pre- micrometer increases power ﹢
When being greater than the 3% of current micro- increasing power with the absolute value that pre- micrometer increases the difference of power ﹣, then the history of observation window storage is utilized
Library prediction model recalculates pre- micrometer according to the method in step D and increases power ﹢ and pre- micrometer increasing power ﹣, enters step F；
F, be arranged comparator, the comparator to after being supervised by observation window current micro- increasings power, pre- micrometer increasing power ﹢,
Pre- micrometer increases this three groups of parameters of power ﹣ and is compared, and activates the corresponding frequency conversion of maximum value in this three groups of parameters to follow revolution speed, through limiting
After width and speed limit, the as output of control system.
In the step C, the initial value carculation method of node: selection 5 DEG C, 10 DEG C, 15 DEG C, 20 DEG C, 25 DEG C, 30 DEG C, 35
DEG C this 7 parameters as node recirculated water into condenser inlet temperature variable, select 40%, 50%, 60%, 70%, 80%,
90%, 100%, 110%, 120% specified frequency conversion follows revolution speed this 9 parameters as the frequency conversion of node and follows revolution speed variable, with
The combination of two of upper two variable-values is the independent variable of node, thus totally 7 × 9=63 is a for node；Pump characteristics is followed in frequency conversion
On curve, revolution speed calculating 9 different circulating water flows of acquisition are followed by 9 different frequency conversions and frequency conversion follows pump wasted work；Not by 9
With circulating water flow and 7 different recirculated waters into combination of two between condenser inlet temperature parameter, condenser spy
It is calculated on linearity curve and obtains 63 condenser vacuums, and calculated and obtained under 63 different vacuum by fair curve of the back pressure to power
Steamer electric power, subtract the frequency conversion under same circulating water flow follow pump wasted work be 63 nodes pre- micrometer increase power because
Variable.
In the step C, the update rule of the node of history library prediction model: the frequency conversion of input control system follows pump and turns
Fast n, recirculated water are calculated into condenser inlet temperature T and by step B the current micro- increasing power P obtained, replacement history library prediction
A node in model, the frequency conversion of the node follow revolution speed n0, recirculated water is into condenser inlet temperature T0, pre- micrometer increase power
P0Minimum in the Euclidean distance of all nodes and (n, T, P), the calculation formula of Euclidean distance L with the Euclidean distance of (n, T, P)
It is as follows:
The node real-time update of history library prediction model, enables history library prediction model that equipment running status is followed to become
Change and changes.
In the step E, the history library prediction model that observation window stores each time, what all the covering last time stored is gone through
History library prediction model.
In the step F, clipping is that 40% to 120% specified frequency conversion follows revolution speed, and speed limit is that variation does not surpass per minute
It crosses 1% specified frequency conversion and follows revolution speed.
Compared to the prior art compared with the present invention has following advantage:
The Turbine Cold Junction of the power station factory of Most current mostly uses height constant speed to follow pump collocation operation, selectable operation side
Formula is simple, can not achieve continuously adjusting for circulating water flow, and unit energy-saving effect is caused to be not obvious.Currently, the newly-built electricity in part
Factory has started to use frequency conversion to follow pump to follow pump to replace constant speed, to obtain energy-saving effect more outstanding.The present invention is based on frequency conversions
The Turbine Cold Junction optimization progress control method for following pump, follows the continuous tune that revolution speed realizes circulating water flow by changing frequency conversion
Section, and exported according to the real-time adjustment control system of unit current operating conditions, so that condenser operates in optimum vacuum always, from
And the difference that steamer electric power and frequency conversion follow pump wasted work is maximum.
Detailed description of the invention
Fig. 1 is control method flow diagram of the present invention.
Fig. 2 is history library prediction model initial value calculating process schematic diagram.
Specific embodiment
As shown in Figure 1, it is a kind of based on frequency conversion follow pump Turbine Cold Junction optimization progress control method the following steps are included:
A, acquisition frequency conversion follows revolution speed, frequency conversion follows pump voltage, frequency conversion follow pump electric current, recirculated water into condenser inlet temperature,
Input variable of five variables of steamer electric power as control system, and input variable have passed through filtering, the filtering method: vapour
Taking turns electric power fluctuation to be no more than the mean value of 15MW and maintenance 5 minutes or more all input variables within the period is filtering knot
Fruit enters step B.
B, ignore frequency conversion and follow the variation that pump power factor follows pump wasted work with frequency conversion, pump voltage is followed by frequency conversion and frequency conversion follows pump electricity
Stream multiplication obtains frequency conversion and follows pump wasted work, and steamer electric power and frequency conversion follow the difference of pump wasted work, then divided by steamer electric power and vapour
The ratio of turbine electric rating is current micro- increasing power, enters step C.
C, history library prediction model is set, which is to follow revolution speed and recirculated water into solidifying in input frequency conversion
The model that pre- micrometer increases power is calculated and exported when vapour device inlet temperature；The algorithm of history library prediction model is in 63 nodes
Two-dimensional interpolation is carried out in set, these nodes are to follow revolution speed, recirculated water in frequency conversion to increase function into condenser inlet temperature, pre- micrometer
Known numeric value point in the three-dimensional system of coordinate of rate；The initial value of node follows pump characteristic curve according to the frequency conversion that device manufacturer provides, coagulates
These three design curves calculate to the fair curve of power for vapour device characteristic curve, back pressure；Unit in the process of running, by defeated
The frequency conversion for entering control system follows revolution speed, recirculated water into condenser inlet temperature and by current micro- increasing power of step B calculating
The node for carrying out real-time update history library prediction model, enters step D.
D, it is followed on revolution speed variable value plus the circulation of 1 rev/min and input control system in the frequency conversion of input control system
Water is into condenser inlet temperature variable as independent variable, and interpolation calculation obtains pre- micrometer increasing power ﹢ in history library prediction model；
It is followed on revolution speed variable value in the frequency conversion of input control system and subtracts 1 rev/min and the recirculated water of input control system is into condenser
Inlet temperature variable is as independent variable, and interpolation calculation obtains pre- micrometer increasing power ﹣ in history library prediction model, enters step E.
E, observation window is set, which can store the history library prediction model before more new node each time, and
Power ﹢ is increased to current micro- increasing power, pre- micrometer and pre- micrometer increases this three groups of parameters of power ﹣ and exercises supervision: when pre- micrometer increases power ﹢
When being greater than the 3% of current micro- increasing power with the absolute value that pre- micrometer increases the difference of power ﹣, then the history of observation window storage is utilized
Library prediction model recalculates pre- micrometer according to the method in step D and increases power ﹢ and pre- micrometer increasing power ﹣, enters step F.
F, be arranged comparator, the comparator to after being supervised by observation window current micro- increasings power, pre- micrometer increasing power ﹢,
Pre- micrometer increases this three groups of parameters of power ﹣ and is compared, and activates the corresponding frequency conversion of maximum value in this three groups of parameters to follow revolution speed, through limiting
After width and speed limit, the as output of control system.
In the step C, two-dimensional interpolation method: found in history library prediction model and input history library prediction model
Frequency conversion follow revolution speed ncWith recirculated water into condenser inlet temperature TcFour nearest node (n of distance1,T1,P1)、(n2,T2,
P2)、(n3,T3,P3)、(n4,T4,P4), apart from nearest measurement condition: the frequency conversion without other nodes follows revolution speed and recirculated water
Into condenser inlet temperature variable value by (n1,T1)、(n2,T2)、(n3,T3)、(n4,T4) constitute square range in,
And meet formula (2):
Pre- micrometer then, which is calculated, using two-dimensional interpolation increases power PcFormula:
In the step C, the initial value carculation method of node: selection 5 DEG C, 10 DEG C, 15 DEG C, 20 DEG C, 25 DEG C, 30 DEG C, 35
DEG C this 7 parameters as node recirculated water into condenser inlet temperature variable, select 40%, 50%, 60%, 70%, 80%,
90%, 100%, 110%, 120% specified frequency conversion follows revolution speed this 9 parameters as the frequency conversion of node and follows revolution speed variable, with
The combination of two of upper two variable-values is the independent variable of node, thus totally 7 × 9=63 is a for node；Pump characteristics is followed in frequency conversion
On curve, revolution speed calculating 9 different circulating water flows of acquisition are followed by 9 different frequency conversions and frequency conversion follows pump wasted work；Not by 9
With circulating water flow and 7 different recirculated waters into combination of two between condenser inlet temperature parameter, condenser spy
It is calculated on linearity curve and obtains 63 condenser vacuums, and calculated and obtained under 63 different vacuum by fair curve of the back pressure to power
Steamer electric power, subtract the frequency conversion under same circulating water flow follow pump wasted work be 63 nodes pre- micrometer increase power because
Variable；The parameter process of the above calculating process is as shown in Figure 2.
In the step C, the update rule of the node of history library prediction model: the frequency conversion of input control system follows pump and turns
Fast n, recirculated water are calculated into condenser inlet temperature T and by step B the current micro- increasing power P obtained, replacement history library prediction
A node in model, the frequency conversion of the node follow revolution speed n0, recirculated water is into condenser inlet temperature T0, pre- micrometer increase power
P0Minimum in the Euclidean distance of all nodes and (n, T, P), the calculation formula of Euclidean distance L with the Euclidean distance of (n, T, P)
It is as follows:
The node real-time update of history library prediction model, enables history library prediction model that equipment running status is followed to become
Change and changes；
In the step E, the history library prediction model that observation window stores each time, what all the covering last time stored is gone through
History library prediction model.
In the step F, clipping is that 40% to 120% specified frequency conversion follows revolution speed, and speed limit is that variation does not surpass per minute
It crosses 1% specified frequency conversion and follows revolution speed.
Listed above is only specific implementation sample of the invention, and the present invention is not limited to the above sample, can also be had all
Shape changeable.All deformations for directly exporting or associating from the disclosure of invention are considered as protection model of the invention
It encloses.
Claims (5)
1. a kind of Turbine Cold Junction for following pump based on frequency conversion optimizes progress control method, which comprises the following steps:
A, frequency conversion follows revolution speed, frequency conversion follows pump voltage, frequency conversion follows pump electric current, recirculated water into condenser inlet temperature, steamer for acquisition
Input variable of five variables of electric power as control system, and input variable have passed through filtering, the method for the filtering: steamer
Electric power fluctuation is no more than the mean value of 15MW and maintenance 5 minutes or more all input variables in holding time for filtering knot
Fruit enters step B；
B, ignore frequency conversion and follow the variation that pump power factor follows pump wasted work with frequency conversion, pump voltage is followed by frequency conversion and frequency conversion follows pump electric current phase
Multiplied to follow pump wasted work to frequency conversion, steamer electric power and frequency conversion follow the difference of pump wasted work, then divided by steamer electric power and steam turbine
The ratio of electric rating is current micro- increasing power, enters step C；
C, history library prediction model is set, which is to follow revolution speed and recirculated water into condenser in input frequency conversion
The model that pre- micrometer increases power is calculated and exported when inlet temperature；The algorithm of history library prediction model is the set in 63 nodes
Middle carry out two-dimensional interpolation, these nodes are to follow revolution speed, recirculated water in frequency conversion to increase power into condenser inlet temperature, pre- micrometer
Known numeric value point in three-dimensional system of coordinate；The initial value of node follows pump characteristic curve, condenser according to the frequency conversion that device manufacturer provides
These three design curves calculate to the fair curve of power for characteristic curve, back pressure；Unit in the process of running, is controlled by input
It is real into condenser inlet temperature and by current micro- increasing power of step B calculating that the frequency conversion of system processed follows revolution speed, recirculated water
The node of Shi Gengxin history library prediction model, enters step D；
D, the frequency conversion of input control system follow on revolution speed variable value plus the recirculated water of 1 rev/min and input control system into
Condenser inlet temperature variable is as independent variable, and interpolation calculation obtains pre- micrometer increasing power ﹢ in history library prediction model；Defeated
The frequency conversion for entering control system, which follows on revolution speed variable value, subtracts 1 rev/min and the recirculated water of input control system is into condenser entrance
Temperature variable is as independent variable, and interpolation calculation obtains pre- micrometer increasing power ﹣ in history library prediction model, enters step E；
E, observation window is set, which can store the history library prediction model before more new node each time, and to working as
Preceding micro- increasing power, pre- micrometer increase power ﹢ and pre- micrometer increases this three groups of parameters of power ﹣ and exercises supervision: as pre- micrometer increasing power ﹢ and in advance
When the absolute value that micrometer increases the difference of power ﹣ is greater than the 3% of current micro- increasing power, then the history library using observation window storage is pre-
Model is surveyed, pre- micrometer is recalculated according to the method in step D and increases power ﹢ and pre- micrometer increasing power ﹣, enter step F；
F, comparator is set, which increases power ﹢, prediction to current micro- increasing power after being supervised by observation window, pre- micrometer
This three groups of parameters of micro- increasing power ﹣ are compared, and the corresponding frequency conversion of maximum value in this three groups of parameters is activated to follow revolution speed, through clipping and
After speed limit, the as output of control system.
2. a kind of Turbine Cold Junction for following pump based on frequency conversion as described in claim 1 optimizes progress control method, feature exists
In: in the step C, the initial value carculation method of node: selection 5 DEG C, 10 DEG C, 15 DEG C, 20 DEG C, 25 DEG C, 30 DEG C, 35 DEG C this 7
A parameter as node recirculated water into condenser inlet temperature variable, select 40%, 50%, 60%, 70%, 80%, 90%,
100%, 110%, 120% specified frequency conversion follows revolution speed this 9 parameters as the frequency conversion of node and follows revolution speed variable, two above
The combination of two of variable-value is the independent variable of node, thus totally 7 × 9=63 is a for node；It is followed on pump characteristic curve in frequency conversion,
Revolution speed calculating 9 different circulating water flows of acquisition are followed by 9 different frequency conversions and frequency conversion follows pump wasted work；It different is followed by 9
Ring water flow and 7 different recirculated waters into combination of two between condenser inlet temperature parameter, in condenser performance curve
Upper calculating obtains 63 condenser vacuums, and calculates the steamer obtained under 63 different vacuum by fair curve of the back pressure to power
Electric power subtracts the frequency conversion under same circulating water flow and follows the pre- micrometer increasing power dependent variable that pump wasted work is 63 nodes.
3. a kind of Turbine Cold Junction for following pump based on frequency conversion as described in claim 1 optimizes progress control method, feature exists
In: in the step C, the update of the node of history library prediction model rule: the frequency conversion of input control system follow revolution speed n,
Recirculated water is into condenser inlet temperature T and the current micro- increasing power P obtained is calculated by step B, replaces history library prediction model
In a node, the frequency conversion of the node follows revolution speed n0, recirculated water is into condenser inlet temperature T0, pre- micrometer increase power P0With
The Euclidean distance of (n, T, P) is minimum in the Euclidean distance of all nodes and (n, T, P), and the calculation formula of Euclidean distance L is as follows:
The node real-time update of history library prediction model, enable history library prediction model follow equipment running status change and
Variation.
4. a kind of Turbine Cold Junction for following pump based on frequency conversion as described in claim 1 optimizes progress control method, feature exists
In: in the step E, the history library of the last storage of the history library prediction model that observation window stores each time, all covering
Prediction model.
5. a kind of Turbine Cold Junction for following pump based on frequency conversion as described in claim 1 optimizes progress control method, feature exists
In: in the step F, clipping is that 40% to 120% specified frequency conversion follows revolution speed, and speed limit is that variation is no more than 1% per minute
Specified frequency conversion follows revolution speed.
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| CN109814641B (en) * | 2018-11-27 | 2021-03-30 | 大唐七台河发电有限责任公司 | Economic adjustment method for cold end of wet cooling unit of thermal power plant |
| CN110185604B (en) * | 2019-05-16 | 2020-05-08 | 国家能源(山东)工程技术有限公司 | Variable frequency control method and system for circulating water pump motor of thermal power plant |
| CN110966170B (en) * | 2019-11-27 | 2021-01-15 | 河北涿州京源热电有限责任公司 | Real-time control method for cold end back pressure of indirect air cooling generator set |
| CN112228329A (en) * | 2020-10-22 | 2021-01-15 | 西安热工研究院有限公司 | System, device and method for automatically optimizing and adjusting running frequency of circulating water pump |
| CN113686170B (en) * | 2021-08-30 | 2023-10-27 | 深圳众诚新技术有限公司 | Cold end follow-up tracking adjustment method and system for short-period steam turbine |
| CN113864013B (en) * | 2021-10-09 | 2023-07-14 | 中国大唐集团科学技术研究院有限公司西北电力试验研究院 | Cold end optimization method for all-condition of wet-cooling thermal power unit |
| CN114017150B (en) * | 2021-11-05 | 2023-03-17 | 西安热工研究院有限公司 | Multi-circulating-pump coordinated dispatching control system and method for gas-steam combined cycle unit |
| CN118170076A (en) * | 2024-05-14 | 2024-06-11 | 中国电力工程顾问集团西南电力设计院有限公司 | Cold end optimizing operation system of unit |
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| CN102735382A (en) * | 2012-07-09 | 2012-10-17 | 中国石油大学(北京) | Energy efficiency test method and device of variable frequency oil pump unit |
| JP2016044577A (en) * | 2014-08-21 | 2016-04-04 | 株式会社Ihi | Waste heat generating device |
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| CN102735382A (en) * | 2012-07-09 | 2012-10-17 | 中国石油大学(北京) | Energy efficiency test method and device of variable frequency oil pump unit |
| JP2016044577A (en) * | 2014-08-21 | 2016-04-04 | 株式会社Ihi | Waste heat generating device |
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Application publication date: 20171201 Assignee: Huaneng Longdong Energy Co.,Ltd. Zhengning Power Plant Assignor: Xi'an Thermal Power Research Institute Co.,Ltd. Contract record no.: X2023980052171 Denomination of invention: A Control Method for Optimizing Cold End Operation of Steam Turbine Based on Variable Frequency Circulating Pump Granted publication date: 20190319 License type: Common License Record date: 20231213 |
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