CN102352780A - Optimal control method of cold end of thermal power generating unit - Google Patents
Optimal control method of cold end of thermal power generating unit Download PDFInfo
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- CN102352780A CN102352780A CN201110182546XA CN201110182546A CN102352780A CN 102352780 A CN102352780 A CN 102352780A CN 201110182546X A CN201110182546X A CN 201110182546XA CN 201110182546 A CN201110182546 A CN 201110182546A CN 102352780 A CN102352780 A CN 102352780A
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Abstract
The invention discloses an optimal control method of the cold end of a thermal power generating unit. The method comprises the following steps: S1, acquriing the inlet temperature of circulation water of a condenser and the load rate of a generator; S2, calculating the optimal operation mode of a circulation water pump according to the inlet temperature of the circulation water of the condenser and the load rate of the generator under the initial property and given operation mode of the circulation water pump; S3, comparing the current operation mode of the circulation water pump with the optimal operation mode of the circulation water pump, continuing the current operation mode if the current operation mode is same as the optimal operation mode, otherwise executing S4 if the current operation mode is not same as the optimal operation mode; and S4, starting up a driving instruction, and switching the operation mode of the circulation water pump to the optimal operation mode. According to the invention, no matter how the circulation water temperature and the load of the generator vary, the operation mode of the circulation water pump is always in an optimal state, so that the real-time optimal control of the cold end under the environment at the time is realized, and the energy-saving potentiality of the thermal power generating unit can be developed maximally.
Description
Technical field
The invention belongs to the thermal power generation field, be specifically related to a kind of fired power generating unit cold junction optimal control method.
Background technique
The efficient of fired power generating unit is subjected to the cold junction parameter influence, and wherein there is adjusting condition sometimes in quantity of circulating water, and can make the cold junction operation be in optimum state.Control but just press at present the circulating water temperature rise simply, still can not make cold junction reach the level of optimization of prevailing circumstances condition, be unfavorable for excavating to greatest extent the energy-saving potential of fired power generating unit.
Summary of the invention
(1) technical problem that will solve
The objective of the invention is deficiency, a kind of level of optimization that can make cold junction reach the prevailing circumstances condition is provided, when generated energy is big, reduce the fired power generating unit cold junction optimal control method of power consumption to present fired power generating unit energy-saving potential excavation.
(2) technological scheme
In order to solve the problems of the technologies described above, the present invention provides a kind of fired power generating unit cold junction optimal control method, may further comprise the steps:
S1 obtains vapour condenser circulating water intake temperature and generator load rate;
S2 is under the initial characteristic and the given method of operation of circulating water pump, according to the optimized operation mode of said vapour condenser circulating water intake temperature and generator load rate computation cycles water pump;
S3 is with the current method of operation and the comparison of said optimized operation mode of circulating water pump; If identical, then continue the current method of operation; If different, then change step S4 over to;
S4 starts drive instruction, and the method for operation of switching circulating water pump is to said optimized operation mode.
Preferably, the method for calculating circulating water pump optimized operation mode comprises step among the said step S2:
S21 under the initial characteristic and the given method of operation of circulating water pump, according to vapour condenser circulating water intake temperature, generator load rate, obtains the working state of circulating water pump operation point;
S22 is according to the working state difference calculating generator generating increment and the circulating water pump power consumption of circulating water pump operation point;
S23 deducts circulating water pump power consumption with said generator for electricity generation increment and obtains having a net increase of generated energy;
S24 regulates the quantity of circulating water of circulating water pump, makes the said generated energy that has a net increase of maximum and in the possible quantity of circulating water scope of circulating water pump, thereby obtains the optimized operation mode of circulating water pump.
Preferably, the computational methods of generator for electricity generation increment comprise step among the said step S22:
S221 obtains given turbine back pressure according to the working state of circulating water pump operation point;
S222 obtains steam turbine according to turbine discharge amount and steam discharge mass dryness fraction and iterates back pressure;
S223, more said given back pressure with iterate back pressure; If equate then calculating generator generating increment, if unequal then regulate turbine back pressure up to iterate back pressure and equate.
(3) beneficial effect
The present invention is through vapour condenser circulating water inlet temperature and generator power on-line measurement signal, computation cycles water pump optimized operation mode, again with the current method of operation relatively, if difference then start drive instruction, the method for operation of switching circulating water pump.No matter how circulating water temperature and generator load change, make the circulating water pump method of operation be in optimum all the time, realize the real-time cold junction optimal control under the prevailing circumstances condition, excavate the energy-saving potential of fired power generating unit to greatest extent.
Description of drawings
Fig. 1 is the flow chart of fired power generating unit cold junction optimal control method of the present invention;
Fig. 2 is fired power generating unit cold junction optimal control method one an embodiment's of the present invention flow chart.
Embodiment
Below in conjunction with accompanying drawing and embodiment, specific embodiments of the invention describes in further detail.Following examples are used to illustrate the present invention, but are not restriction scopes of the present invention.
Like Fig. 1～shown in Figure 2, fired power generating unit cold junction optimal control method of the present invention may further comprise the steps:
S1 obtains vapour condenser circulating water intake temperature and generator load rate;
S2 is under the initial characteristic and the given method of operation of circulating water pump, according to the optimized operation mode of said vapour condenser circulating water intake temperature and generator load rate computation cycles water pump;
S3 is with the current method of operation and the comparison of said optimized operation mode of circulating water pump; If identical, then continue the current method of operation; If different, then change step S4 over to;
S4 starts drive instruction, and the method for operation of switching circulating water pump is to said optimized operation mode.
Wherein, the method for calculating circulating water pump optimized operation mode comprises step among the said step S2:
S21 under the initial characteristic and the given method of operation of circulating water pump, according to vapour condenser circulating water intake temperature, generator load rate, obtains the working state of circulating water pump operation point;
S22 is according to the working state difference calculating generator generating increment and the circulating water pump power consumption of circulating water pump operation point;
S23 deducts circulating water pump power consumption with said generator for electricity generation increment and obtains having a net increase of generated energy;
S24 regulates the quantity of circulating water of circulating water pump, makes the said generated energy that has a net increase of maximum and in the possible quantity of circulating water scope of circulating water pump, thereby obtains the optimized operation mode of circulating water pump.
Further, the computational methods of generator for electricity generation increment comprise step among the said step S22:
S221 obtains given turbine back pressure according to the working state of circulating water pump operation point;
S222 obtains steam turbine according to turbine discharge amount and steam discharge mass dryness fraction and iterates back pressure;
S223, more said given back pressure with iterate back pressure; If equate then calculating generator generating increment, if unequal then regulate turbine back pressure up to iterate back pressure and equate.
As stated above; In one embodiment; Calculate the optimum circulating ratio of the variable-speed operation of one, one and half and two circulating water pump in the specified water yield scope of water pump, back pressure, generated output increment and the power consumption sum of circulating water pump, the power consumption of circulating water pump according to certain power plant's average month by month circulating water inlet temperature, generator load rate and hours run of calendar year 2001; And then the economic well-being of workers and staff of calculated for given cost of electricity-generating and with current operating mode relatively, visual effects.Energy-saving effect is relevant with circulating water inlet temperature and generator load.
In the present embodiment, use seawater, can obtain ocean temperature, can obtain generator power through on-line measurement at the condenser water inlet as vapour condenser circulating water; The circulating water pump method of operation is a circulating water pump operation platform number, when initial, is given; The circulating water pump initial characteristic comprises circulating water pump maximum volume flow, circulating water pump biggest quality flow and circulating water pump rated revolution.The circulating water pump operation point comprises operation point and single pump work point of every pump when two pumps are arranged side by side: through circulating water pump operation point difference calculating generator generating increment and circulating water pump power consumption; The generator for electricity generation increment obtains given turbine back pressure according to the working state of circulating water pump operation point, obtains steam turbine according to turbine discharge amount and steam discharge mass dryness fraction and iterates back pressure; More said given back pressure with iterate back pressure; If equate then calculating generator generating increment, if unequal then regulate turbine back pressure up to iterate back pressure and equate.The back pressure of steam turbine is the function of unit generation load, circulating water temperature, circulating water flow when operation.When the steam turbine back pressure was higher or lower than the specified back pressure of design, for the input of same parameter, the generated energy of steam turbine reduced to some extent or increases in the time of will be than specified back pressure.When changing the circulating water method of operation, not only changed quantity of circulating water, also changed the power consumption of circulating water pump.Therefore, in the possible water supply coverage of circulating pump system, have the water yield an of the best, what the generated energy increment that the operation back pressure that should the water yield makes steam turbine is formed deducted recycle pump power consumption has a net increase of the generated energy maximum.The combination of different water pump operation state will have different water outputs and the different above-mentioned generated energy that has a net increase of, and relatively these have a net increase of generated energy and can find the method for operation for above-mentioned optimum target.
The circulating water pump method of operation of table 1 under different generator load rates and circulating water inlet temperature, adopting.
Table 1
No matter how circulating water temperature and generator load change, make the platform number of circulating water pump be in optimum all the time, realize the real-time cold junction optimal control under the prevailing circumstances condition, excavate the energy-saving potential of fired power generating unit to greatest extent.
The above only is a preferred implementation of the present invention; Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from know-why of the present invention; Can also make some improvement and replacement, these improvement and replacement also should be considered as protection scope of the present invention.
Claims (3)
1. a fired power generating unit cold junction optimal control method is characterized in that, may further comprise the steps:
S1 obtains vapour condenser circulating water intake temperature and generator load rate;
S2 is under the initial characteristic and the given method of operation of circulating water pump, according to the optimized operation mode of said vapour condenser circulating water intake temperature and generator load rate computation cycles water pump;
S3 is with the current method of operation and the comparison of said optimized operation mode of circulating water pump; If identical, then continue the current method of operation; If different, then change step S4 over to;
S4 starts drive instruction, and the method for operation of switching circulating water pump is to said optimized operation mode.
2. controlling method as claimed in claim 1 is characterized in that, the method for calculating circulating water pump optimized operation mode among the said step S2 comprises step:
S21 under the initial characteristic and the given method of operation of circulating water pump, according to vapour condenser circulating water intake temperature, generator load rate, obtains the working state of circulating water pump operation point;
S22 is according to the working state difference calculating generator generating increment and the circulating water pump power consumption of circulating water pump operation point;
S23 deducts circulating water pump power consumption with said generator for electricity generation increment and obtains having a net increase of generated energy;
S24 regulates the quantity of circulating water of circulating water pump, makes the said generated energy that has a net increase of maximum and in the possible quantity of circulating water scope of circulating water pump, thereby obtains the optimized operation mode of circulating water pump.
3. controlling method as claimed in claim 2 is characterized in that, the computational methods of generator for electricity generation increment comprise step among the said step S22:
S221 obtains given turbine back pressure according to the working state of circulating water pump operation point;
S222 obtains steam turbine according to turbine discharge amount and steam discharge mass dryness fraction and iterates back pressure;
S223, more said given back pressure with iterate back pressure; If equate then calculating generator generating increment, if unequal then regulate turbine back pressure up to iterate back pressure and equate.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104749999A (en) * | 2015-03-20 | 2015-07-01 | 国电科学技术研究院 | Accurate guidance system for optimizing operation of turbo generator group cold end system of assembly wet-type cooling tower |
| CN105569748A (en) * | 2014-10-31 | 2016-05-11 | 王砧 | Operation back pressure continuous optimized control method and system for wet cooling steam turbine |
| CN106894854A (en) * | 2017-02-23 | 2017-06-27 | 西安西热节能技术有限公司 | The solidifying formula indirect air cooling generating set cold end system running optimizatin method of table |
| CN113513746A (en) * | 2021-04-26 | 2021-10-19 | 中国大唐集团科学技术研究院有限公司华东电力试验研究院 | Method for determining optimized operation mode of closed circulating water system of thermal power plant |
| CN113671830A (en) * | 2021-08-10 | 2021-11-19 | 浙江浙能技术研究院有限公司 | Thermal power generating unit cold end optimization closed-loop control method based on intelligent scoring |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105569748A (en) * | 2014-10-31 | 2016-05-11 | 王砧 | Operation back pressure continuous optimized control method and system for wet cooling steam turbine |
| CN105571343A (en) * | 2014-10-31 | 2016-05-11 | 王砧 | Operation back pressure continuous optimized control method and system for air-cooled generator unit steam turbine |
| CN105569748B (en) * | 2014-10-31 | 2017-03-15 | 王砧 | A kind of wet cooling gas turbine operation back pressure Filled function control method and system |
| CN105571343B (en) * | 2014-10-31 | 2017-10-10 | 王砧 | Air cooling turbo-generator steam turbine operation back pressure Filled function control method and system |
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| CN104749999B (en) * | 2015-03-20 | 2018-06-26 | 国电科学技术研究院有限公司 | The Turbo-generator Set cold end system optimization operation of assembling wet cooling tower accurately instructs system |
| CN106894854A (en) * | 2017-02-23 | 2017-06-27 | 西安西热节能技术有限公司 | The solidifying formula indirect air cooling generating set cold end system running optimizatin method of table |
| CN106894854B (en) * | 2017-02-23 | 2018-07-10 | 西安西热节能技术有限公司 | Table coagulates formula indirect air cooling generating set cold end system running optimizatin method |
| CN113513746A (en) * | 2021-04-26 | 2021-10-19 | 中国大唐集团科学技术研究院有限公司华东电力试验研究院 | Method for determining optimized operation mode of closed circulating water system of thermal power plant |
| CN113513746B (en) * | 2021-04-26 | 2023-02-28 | 中国大唐集团科学技术研究院有限公司华东电力试验研究院 | Method for determining optimized operation mode of closed circulating water system of thermal power plant |
| CN113671830A (en) * | 2021-08-10 | 2021-11-19 | 浙江浙能技术研究院有限公司 | Thermal power generating unit cold end optimization closed-loop control method based on intelligent scoring |
| CN113671830B (en) * | 2021-08-10 | 2024-04-02 | 浙江浙能数字科技有限公司 | Cold end optimization closed-loop control method for thermal power generating unit based on intelligent scoring |
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