CN116816466A - Main steam temperature optimization adjustment method for gas-steam combined cycle unit - Google Patents
Main steam temperature optimization adjustment method for gas-steam combined cycle unit Download PDFInfo
- Publication number
- CN116816466A CN116816466A CN202310839821.3A CN202310839821A CN116816466A CN 116816466 A CN116816466 A CN 116816466A CN 202310839821 A CN202310839821 A CN 202310839821A CN 116816466 A CN116816466 A CN 116816466A
- Authority
- CN
- China
- Prior art keywords
- main steam
- steam temperature
- water flow
- combined cycle
- optimization
- 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.)
- Pending
Links
- 238000005457 optimization Methods 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title claims abstract description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 47
- 230000009467 reduction Effects 0.000 claims abstract description 20
- 230000000694 effects Effects 0.000 claims abstract description 9
- 239000002918 waste heat Substances 0.000 claims description 38
- 101100059652 Mus musculus Cetn1 gene Proteins 0.000 claims description 3
- 101100059655 Mus musculus Cetn2 gene Proteins 0.000 claims description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000011946 reduction process Methods 0.000 description 1
- 238000010977 unit operation Methods 0.000 description 1
Landscapes
- Control Of Turbines (AREA)
Abstract
A main steam temperature optimization adjustment method of a gas-steam combined cycle unit comprises the following steps: step 1, obtaining a target value of main steam temperature optimization; step 2, presetting the primary steam temperature reduction water flow initial value to be 0t/h; step 3, performing unit thermodynamic calculation to obtain main steam temperature and turbine power; step 4: when the temperature reduction water flow is 0t/h, if the calculated main steam temperature in the step 3 is smaller than the target value, the optimal temperature reduction water flow is 0t/h, the calculated main steam temperature is the optimal value, and the difference between the calculated turbine power and the turbine power before optimization is the efficiency influence caused by optimization; if the calculated main steam temperature is larger than the target value, gradually increasing the temperature reduction water flow, and repeating the step 3 until the deviation between the main steam temperature and the target value is smaller than 0.1 ℃, so as to obtain the optimal temperature reduction water flow, wherein the target value is the realizable optimal main steam temperature, and the difference between the calculated turbine power and the turbine power before optimization is the effect of the optimization.
Description
Technical Field
The invention belongs to the field of gas-steam combined cycle units, and particularly relates to a main steam temperature optimization adjustment method of a gas-steam combined cycle unit.
Background
The main steam temperature of the outlet of the high-pressure superheater of the waste heat boiler of the gas-steam combined cycle unit of the power plant is mainly controlled by operators through a mode of manually setting a main steam temperature target value of the outlet of the final-stage high-pressure superheater.
In the actual process, if the main steam temperature target value of the outlet of the high-pressure final-stage superheater of the waste heat boiler is unreasonably set, or the high-pressure superheater of the waste heat boiler is excessively cooled and not timely adjusted due to factors such as poor control of the main steam temperature reduction process, the main steam temperature of the combined cycle unit deviates from the operation optimal value, loss is brought to the operation efficiency of the waste heat boiler, the output of the combined cycle unit is reduced, and the thermal efficiency of the unit is reduced.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: in order to accurately guide the optimal adjustment of the main steam temperature of the combined cycle unit, the invention provides the optimal adjustment method of the main steam temperature of the gas-steam combined cycle unit, so that power plant operators intuitively know the effect of the main steam temperature deviation, and the optimal main steam temperature reduction water flow to be adjusted is provided, so that the power plant operators are guided to attach importance to and develop the optimal adjustment of the main steam temperature, and the method has remarkable beneficial effects on improving the operation effect of the combined cycle unit.
The invention is realized by adopting the following technical scheme:
a main steam temperature optimization adjustment method of a gas-steam combined cycle unit comprises the following steps:
step 1, acquiring the highest value of the main steam temperature of the waste heat boiler on the premise of ensuring safe and stable operation of the unit based on historical operation data of the combined cycle unit, and taking the main steam temperature as a target value for optimizing and adjusting the main steam temperature of the waste heat boiler;
step 2, presetting the primary steam desuperheating water flow initial value of a high-pressure superheater of a waste heat boiler of the combined cycle unit to be 0t/h;
step 3, carrying out heat calculation of steam circulation at the bottom layer of the combined cycle unit based on the preset main steam attemperation water flow, and calculating to obtain the main steam temperature and the steam turbine power under the main steam attemperation water flow of the high-pressure superheater of the waste heat boiler;
step 4: and when the main steam temperature reduction water flow is 0t/h, comparing the main steam temperature calculated in the step 3 with the target value of the main steam temperature optimization adjustment of the waste heat boiler selected in the step 1, and determining the effectiveness influence caused by the main steam temperature optimization.
In the step 1, the highest value of the main steam temperature of the waste heat boiler in the set time of the stable operation of the unit is taken, and the main steam temperature is taken as the target value of the main steam temperature optimization adjustment of the waste heat boiler, and the method comprises the following steps:
T w2,sh,hrsg,target ＝MAX(T w2,sh,hrsg )
wherein: t (T) w2,sh,hrsg,target Optimizing the adjusted target value for the main steam temperature;
T w2,sh,hrsg is the historical operating data of the main steam temperature, DEG C.
In the step 1, the highest value of the main steam temperature of the waste heat boiler, which is operated stably for more than 1 hour, is taken.
The invention is further improved in that in the step 3, the main steam temperature and the turbine power under the main steam temperature reduction water flow of the high-pressure superheater of the current waste heat boiler are calculated, namely
(Power ST,cal ,T w2,sh,hrsg,cal )＝f ccpp (m desuper,sh )
Wherein: f (f) ccpp A steam circulation thermodynamic calculation model for the bottom layer of the combined cycle unit;
POWER ST,cal for the calculated turbine power, kW;
T w2,sh,hrsg,calt for the calculated main steam temperature, DEG C;
m desuper,shg the flow of the heat-reducing water is t/h for the main steam of the waste heat boiler.
In the step 4, if the calculated main steam temperature is smaller than the target value of main steam temperature optimization adjustment, the optimal main steam temperature reduction water flow under the current working condition is 0t/h, the main steam temperature calculated in the step 3 when the main steam temperature reduction water flow is 0t/h is the optimal main steam temperature which can be realized, and the difference between the turbine power calculated in the step 3 when the main steam temperature reduction water flow is 0t/h and the turbine power before the main steam temperature optimization is the effect of the main steam temperature optimization.
The invention is further improved in that in the step 4, the difference between the turbine power calculated in the step 3 when the main steam temperature reduction water flow is 0t/h and the turbine power before the main steam temperature optimization is the effect brought by the main steam temperature optimization, namely
Power benefits ＝Power ST,cal -Power ST,bo
Wherein: power of ST,benefits The power gain of the steam turbine brought by the optimization of the temperature of the main steam is kW;
POWER ST,cal for the calculated turbine power, kW;
POWER ST,bo the power of the turbine, kW, before optimizing for the main steam temperature.
In the step 4, if the calculated main steam temperature is greater than the target value of main steam temperature optimization adjustment in the step 4, the main steam attemperation water flow of the high-pressure superheater of the waste heat boiler is gradually increased, and the step 3 is repeated to perform the bottom steam circulation thermodynamic calculation of the combined cycle unit until the deviation between the main steam temperature and the target value of main steam temperature optimization adjustment is less than 0.1 ℃, at this time, the main steam attemperation water flow is the optimal main steam temperature attemperation water flow, the target value of main steam temperature optimization adjustment of the waste heat boiler determined in the step 1 is the optimal main steam temperature which can be realized, and the difference between the calculated turbine power and the turbine power before the main steam temperature optimization under the optimal main steam temperature attemperation is the effect of the main steam temperature optimization.
In the step 4, the step 3 is repeated to develop the bottom steam cycle thermodynamic calculation of the combined cycle unit until the deviation between the main steam temperature and the target value optimally adjusted by the main steam temperature is less than 0.1 ℃, namely
abs(T w2,sh,hrsg -T w2,sh,hrsg,target )≤0.1。
The invention has at least the following beneficial technical effects:
the invention provides a main steam temperature optimization adjustment method of a gas-steam combined cycle unit, in particular to a method for calculating and analyzing the actual influence of main steam temperature change on the efficiency of the combined cycle unit when the main steam temperature of the combined cycle unit deviates from an operation optimal value, calculating and obtaining the optimal main steam temperature reducing water flow, guiding power plant operators to perform the optimization adjustment on the main steam temperature, and solving the problems that the main steam temperature of the combined cycle unit deviates from the operation optimal value due to excessive temperature reduction and untimely adjustment of a high-pressure superheater of a waste heat boiler, and further the output of the combined cycle unit is reduced and the thermal efficiency of the unit is reduced.
Drawings
FIG. 1 is a flow chart of a method for optimizing and adjusting the temperature of main steam of a gas-steam combined cycle unit.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other. The invention will be described in detail below with reference to the drawings in connection with embodiments.
As shown in fig. 1, the method for optimizing and adjusting the main steam temperature of the gas-steam combined cycle unit provided by the invention comprises the following steps:
based on historical operation data of the combined cycle unit, the highest value of the main steam temperature of the waste heat boiler, which is used for more than 1 hour in stable operation of the unit, is obtained on the premise of ensuring safe and stable operation of the unit, and the main steam temperature is used as a target value for optimizing and adjusting the main steam temperature of the waste heat boiler, and the method comprises the following steps:
T w2,sh,hrsg,target ＝MAX(T w2,sh,hrsg )
wherein: t (T) w2,sh,hrsg,target Optimizing the adjusted target value for the main steam temperature;
T w2,sh,hrsg is the historical operating data of the main steam temperature, DEG C.
Presetting the primary steam desuperheating water flow initial value of the high-pressure superheater of the waste heat boiler of the combined cycle unit as 0t/h, developing the steam cycle thermodynamic calculation of the bottom layer of the combined cycle unit, and calculating to obtain the primary steam temperature and the turbine power under the primary steam desuperheating water flow of the high-pressure superheater of the current waste heat boiler, namely
(Power ST,cal ,T w2,sh,hrsg,cal )＝f ccpp (m desuper,sh )
Wherein: f (f) ccpp A steam circulation thermodynamic calculation model for the bottom layer of the combined cycle unit;
POWER ST,cal for the calculated turbine power, kW;
T w2,sh,hrsg,calt for the calculated main steam temperature, DEG C;
m desuper,shg the flow of the heat-reducing water is t/h for the main steam of the waste heat boiler.
When the main steam temperature reduction water flow is 0t/h, comparing the calculated main steam temperature with the main steam temperature optimization and adjustment target value of the waste heat boiler, and if the calculated main steam temperature is smaller than the main steam temperature optimization and adjustment target value, the optimal main steam temperature reduction water flow under the current working condition is 0t/h.
When the main steam temperature reduction water flow is 0t/h, the calculated main steam temperature is the optimal main steam temperature which can be realized, and the difference (steam turbine power gain) between the calculated steam turbine power and the steam turbine power before the main steam temperature is optimized is the effectiveness influence caused by the main steam temperature optimization, namely
Power benefits ＝Power ST,cal -Power ST,bo
Wherein: power of ST,benefits The power gain of the steam turbine brought by the optimization of the temperature of the main steam is kW;
POWER ST,cal for the calculated turbine power, kW;
POWER ST,bo the power of the turbine, kW, before optimizing for the main steam temperature.
When the main steam temperature reduction water flow is 0t/h, if the calculated main steam temperature is greater than the main steam temperature optimization adjustment target value, gradually increasing the main steam temperature reduction water flow of the high-pressure superheater of the waste heat boiler until the deviation between the main steam temperature and the main steam temperature optimization adjustment target value is less than 0.1 ℃, namely
abs(T w2,sh,hrsg- T w2,sh,hrsg,target )≤0.1
At this time, the main steam temperature reducing water flow is the optimal main steam temperature reducing water flow, and the difference (turbine power gain) between the turbine power at the optimal main steam temperature reducing water flow and the turbine power before the main steam temperature optimization obtained by carrying out the thermal calculation of the steam cycle at the bottom layer of the combined cycle unit is the effectiveness influence brought by the main steam temperature optimization.
Examples:
by analyzing the historical operation data of a gas-steam combined cycle unit of a certain power plant No. 1, the higher value of the outlet main steam temperature of the high-pressure final-stage superheater, which appears in the historical operation data, is 567.5 ℃ (the operation requirement that the outlet main steam temperature of the high-pressure final-stage superheater of the waste heat boiler specified in the unit operation regulation is not higher than 573.9 ℃) is met), the outlet steam temperature of the high-pressure final-stage superheater of the waste heat boiler fluctuates from about 560 ℃ to 564 ℃ within 17 to 22 days, and the flow rate of the water for reducing the temperature of the high-pressure superheater fluctuates within the range of 15.6 t/h to 15.9 t/h; if the main steam temperature is optimally adjusted, the flow rate of the desuperheating water is reduced to 10-13.5t/h, the main steam temperature at the outlet of the high-pressure final stage superheater can be increased to about 567.4 ℃, the power gain of the steam turbine can reach about 530kW, and the specific results are shown in the table 1 below.
TABLE 1 Main steam temperature optimization adjustment condition of combined cycle unit under typical working condition
While the invention has been described in detail in the foregoing general description and with reference to specific embodiments thereof, it will be apparent to one skilled in the art that modifications and improvements can be made thereto. Accordingly, such modifications or improvements may be made without departing from the spirit of the invention and are intended to be within the scope of the invention as claimed.
Claims (8)
1. The main steam temperature optimization adjustment method of the gas-steam combined cycle unit is characterized by comprising the following steps of:
step 1, acquiring the highest value of the main steam temperature of the waste heat boiler on the premise of ensuring safe and stable operation of the unit based on historical operation data of the combined cycle unit, and taking the main steam temperature as a target value for optimizing and adjusting the main steam temperature of the waste heat boiler;
step 2, presetting the primary steam desuperheating water flow initial value of a high-pressure superheater of a waste heat boiler of the combined cycle unit to be 0t/h;
step 3, carrying out heat calculation of steam circulation at the bottom layer of the combined cycle unit based on the preset main steam attemperation water flow, and calculating to obtain the main steam temperature and the steam turbine power under the main steam attemperation water flow of the high-pressure superheater of the waste heat boiler;
step 4: and when the main steam temperature reduction water flow is 0t/h, comparing the main steam temperature calculated in the step 3 with the target value of the main steam temperature optimization adjustment of the waste heat boiler selected in the step 1, and determining the effectiveness influence caused by the main steam temperature optimization.
2. The method for optimizing and adjusting the main steam temperature of a gas-steam combined cycle unit according to claim 1, wherein in step 1, the highest value of the main steam temperature of the waste heat boiler in the set time for steady operation of the unit is taken, and the main steam temperature is taken as a target value for optimizing and adjusting the main steam temperature of the waste heat boiler, and the method is as follows:
T w2,sh,hrsg,target ＝MAX(T w2,sh,hrsg )
wherein: t (T) w2,sh,hrsg,target Optimizing the adjusted target value for the main steam temperature;
T w2,sh,hrsg is the historical operating data of the main steam temperature, DEG C.
3. The method for optimizing and adjusting the main steam temperature of a gas-steam combined cycle unit according to claim 2, wherein in the step 1, the highest value of the main steam temperature of the waste heat boiler in which the unit stably operates for more than 1 hour is taken.
4. The method for optimizing and adjusting the main steam temperature of a gas-steam combined cycle unit according to claim 2, wherein in step 3, the main steam temperature and the turbine power under the main steam desuperheating water flow of the high-pressure superheater of the current waste heat boiler are calculated, namely
(Power ST,cal ，T w2,sh,hrsg,cal )＝f ccpp (m de sup er,sh )
Wherein: f (f) ccpp A steam circulation thermodynamic calculation model for the bottom layer of the combined cycle unit;
POWER ST,cal for the calculated turbine power, kW;
T w2,sh,hrsg,calt for the calculated main steam temperature, DEG C;
m desuper,shg the flow of the heat-reducing water is t/h for the main steam of the waste heat boiler.
5. The method for optimizing and adjusting the main steam temperature of a gas-steam combined cycle unit according to claim 4, wherein in the step 4, if the calculated main steam temperature is smaller than the target value of main steam temperature optimization adjustment, the optimal main steam attemperation water flow under the current working condition is 0t/h, the main steam temperature calculated in the step 3 when the main steam attemperation water flow is 0t/h is the optimal main steam temperature which can be realized, and the difference between the turbine power calculated in the step 3 when the main steam attemperation water flow is 0t/h and the turbine power before the main steam temperature optimization is the efficiency influence caused by the main steam temperature optimization.
6. The method for optimizing and adjusting main steam temperature of a gas-steam combined cycle unit according to claim 5, wherein in step 4, the difference between the turbine power calculated in step 3 when the main steam temperature reduction water flow is 0t/h and the turbine power before the main steam temperature optimization is the effect of the main steam temperature optimization, namely
Power benefits ＝Power ST,cal -Power ST,bo
Wherein: power of ST,benefits The power gain of the steam turbine brought by the optimization of the temperature of the main steam is kW;
POWER ST,cal for the calculated turbine power, kW;
POWER ST,bo the power of the turbine, kW, before optimizing for the main steam temperature.
7. The method for optimizing and adjusting the main steam temperature of a gas-steam combined cycle unit according to claim 4, wherein in step 4, if the calculated main steam temperature is greater than the target value of main steam temperature optimization adjustment in step 4, the main steam attemperation water flow of the high-pressure superheater of the waste heat boiler is gradually increased, and the step 3 is repeated to perform the thermal calculation of the steam cycle of the bottom layer of the combined cycle unit until the deviation between the main steam temperature and the target value of main steam temperature optimization adjustment is less than 0.1 ℃, at this time, the main steam attemperation water flow is the optimal main steam temperature attemperation water flow, the target value of main steam temperature optimization adjustment of the waste heat boiler determined in step 1 is the achievable optimal main steam temperature, and the difference between the turbine power calculated under the optimal main steam attemperation water flow and the turbine power before the main steam temperature optimization is the effect of the main steam temperature optimization.
8. The method for optimizing and adjusting main steam temperature of a gas-steam combined cycle unit according to claim 7, wherein in step 4, the step 3 is repeated to perform the thermodynamic calculation of the bottom steam cycle of the combined cycle unit until the deviation between the main steam temperature and the target value of the main steam temperature optimization and adjustment is less than 0.1 ℃, namely
abs(T w2，sh，hrsg -T w2，sh，hrsg，target )≤0.1。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310839821.3A CN116816466A (en) | 2023-07-10 | 2023-07-10 | Main steam temperature optimization adjustment method for gas-steam combined cycle unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310839821.3A CN116816466A (en) | 2023-07-10 | 2023-07-10 | Main steam temperature optimization adjustment method for gas-steam combined cycle unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116816466A true CN116816466A (en) | 2023-09-29 |
Family
ID=88127432
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310839821.3A Pending CN116816466A (en) | 2023-07-10 | 2023-07-10 | Main steam temperature optimization adjustment method for gas-steam combined cycle unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116816466A (en) |
-
2023
- 2023-07-10 CN CN202310839821.3A patent/CN116816466A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101864994B (en) | Correction method for optimization of sliding pressure of large steam turbine | |
| CN107780982B (en) | Back pressure control system and method for online indirect air cooling high back pressure heat supply unit | |
| JPS58501866A (en) | Damper control device for heat recovery steam generator | |
| CN106368750B (en) | Method and apparatus for optimizing steam header mixing and gas turbine load in a combined cycle power plant | |
| CN100385092C (en) | Rapid power producing system and method for steam turbine | |
| CN111596546B (en) | Disturbance rejection prediction control method for combined heat and power system of micro gas turbine | |
| CN110735668A (en) | indirect method steam distribution function setting value simplification realization method | |
| JP6608324B2 (en) | Power plant output control apparatus and method | |
| CN111256204B (en) | Heat supply optimization method of coupling absorption heat pump of thermal power plant | |
| JP4818391B2 (en) | Steam turbine plant and operation method thereof | |
| CN106451569A (en) | Daily on-off type peak load operation method of gas engine set | |
| CN116816466A (en) | Main steam temperature optimization adjustment method for gas-steam combined cycle unit | |
| CN109033724A (en) | Stream temperature degree applied to steam turbine sliding pressure operation consumes poor fair curve optimization method | |
| GB2166198A (en) | Improved steam turbine load control in a combined cycle electrical power plant | |
| CN108005735B (en) | A kind of real-time dynamic correcting method of best first pressing of Steam Turbine | |
| CN112855297B (en) | Heat source shunting type waste heat power generation system and optimization control method thereof | |
| JPH08233989A (en) | Reactor power plant and operation method | |
| JP3797953B2 (en) | Thermal power plant control device, operation support system, and operation support service method | |
| CN111507011A (en) | Method for correcting influence quantity of heat supply extraction steam on sliding pressure operation of steam turbine | |
| CN117375006A (en) | Thermoelectric load distribution method for multi-capacity-containing unit and multi-section steam extraction heat supply thermal power plant | |
| CN113158444B (en) | Correction calculation method for influence of low-temperature economizer operation on steam turbine heat consumption | |
| JP6775070B1 (en) | Power plant control device, power plant, and power plant control method | |
| CN112799447B (en) | Control method of high-pressure heater | |
| CN109196189B (en) | Method for heating a valve | |
| CN117386511A (en) | TCA cooling water control method and system |
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 |