CN114234171A - Deaerator pressure control method - Google Patents
Deaerator pressure control method Download PDFInfo
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- CN114234171A CN114234171A CN202111467427.9A CN202111467427A CN114234171A CN 114234171 A CN114234171 A CN 114234171A CN 202111467427 A CN202111467427 A CN 202111467427A CN 114234171 A CN114234171 A CN 114234171A
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- Prior art keywords
- deaerator
- pressure
- value
- opening
- regulating valve
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- 238000000034 method Methods 0.000 title claims abstract description 8
- 238000012937 correction Methods 0.000 claims abstract description 20
- 230000001105 regulatory effect Effects 0.000 claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 12
- 238000012544 monitoring process Methods 0.000 claims abstract description 6
- 238000012935 Averaging Methods 0.000 claims abstract description 5
- 238000012545 processing Methods 0.000 claims abstract description 4
- 239000013256 coordination polymer Substances 0.000 claims description 20
- 238000009530 blood pressure measurement Methods 0.000 abstract description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000003518 caustics Substances 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/50—Feed-water heaters, i.e. economisers or like preheaters incorporating thermal de-aeration of feed-water
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D5/00—Controlling water feed or water level; Automatic water feeding or water-level regulators
- F22D5/26—Automatic feed-control systems
Abstract
The invention aims to provide a deaerator pressure control method, which comprises the steps of determining a deaerator pressure measuring range and a target value according to deaerator pressure historical data; acquiring a pressure value of the deaerator at the moment t by adopting 2 deaerator pressure monitoring sensors; averaging the pressure values of 2 deaerators at the time t to obtain an average deaerator pressure value; acquiring the opening of a condenser water level recirculation regulating valve at the moment t, and multiplying the opening by a correction coefficient to convert the opening into a correction value; taking an absolute value after the average value of the deaerator pressure at the time t is different from the target value to obtain a deviation value; converting the deviation value into a proportionality coefficient through linearization processing; the opening degree of the deaerator pressure regulating valve is output through operation, the deaerator pressure regulating valve is controlled in real time, and then the deaerator pressure is controlled. The invention can reduce the pressure measurement error of the deaerator; the opening of the condenser water level recirculation regulating valve is converted into a correction value, so that the control precision can be improved, and the pressure of the deaerator can be quickly and accurately controlled.
Description
Technical Field
The invention relates to a boiler control method, in particular to a deaerator control method.
Background
The deaerator is one of key devices of a boiler control system, and has the functions of heating feed water to the saturation temperature corresponding to the working pressure of the deaerator, removing oxygen and other gases dissolved in the feed water, and preventing and reducing corrosion of a boiler feed water pipe, an economizer and other accessory devices. If the deaerator is controlled improperly, the deaerator has poor deaerating capability, and can cause corrosion to boiler feed water pipelines, economizers and other accessory equipment. Corrosive substances can enter the boiler and deposit or attach on the wall and the heated surface of the boiler to form indissolvable and poor heat transfer iron scale, and when the pipeline is seriously corroded, the pipeline explosion accident is easy to happen. Therefore, it is necessary to control the deaerator pressure quickly and accurately.
Disclosure of Invention
The invention aims to provide a deaerator pressure control method for solving the deaerator pressure control problem.
The purpose of the invention is realized as follows:
the invention relates to a deaerator pressure control method, which is characterized by comprising the following steps:
(1) determining a deaerator pressure range and a target value SP according to deaerator pressure historical data;
(2) acquiring a pressure value P of the deaerator at the moment t by adopting 2 deaerator pressure monitoring sensors1(t) and P2(t)；
(3) The pressure value P of the deaerator at the moment t1(t) and P2(t) averaging to obtain the average value P of the deaerator pressureV(t)：
(4) And acquiring the opening K (t) of the condenser water level recirculation regulating valve at the time t, multiplying the opening K (t) by a correction coefficient A, and converting the opening K (t) into a correction value Q (t):
Q(t)＝A×K(t)；
(5) average value P of deaerator pressure at t momentV(t) obtaining an absolute value after the difference between the target value SP and the value SP, and obtaining a deviation value E (t):
E(t)＝|PV(t)-SP|；
(6) converting the deviation value E (t) into a proportionality coefficient C through linearization processingP(t)：
| Deviation value E (t) | Coefficient of proportionality CP(t) |
| E(1) | CP(1) |
| E(2) | CP(2) |
| … | … |
| E(n) | CP(n) |
；
(7) The deaerator pressure regulating valve opening degree Ky (t) is output according to the following formula operation, the deaerator pressure regulating valve is controlled in real time, and then the deaerator pressure is controlled:
Ky(t)＝CP(t)×E(t)+Q(t)，
wherein, CP(t), E (t), Q (t) and the correction value are respectively the proportional coefficient, the deviation value and the correction value at time t.
The invention has the advantages that:
1. the invention adopts 2 deaerator pressure monitoring sensors to monitor the deaerator pressure, and can reduce the deaerator pressure measurement error.
2. The invention converts the opening of the water level recirculation regulating valve of the condenser into a correction value, and can improve the control precision.
3. The invention can rapidly and accurately control the pressure of the deaerator through real-time operation.
4. The invention has simple operation and convenient realization.
Drawings
FIG. 1 is a flow chart of the present invention.
Detailed Description
The invention will now be described in more detail by way of example with reference to the accompanying drawings in which:
with reference to fig. 1, the present invention comprises the following steps:
(1) and determining the pressure range and the target value SP of the deaerator according to the deaerator pressure historical data.
(2) Acquiring a pressure value P of the deaerator at the moment t by adopting 2 deaerator pressure monitoring sensors1(t) and P2(t)。
(3) The pressure value P of the deaerator at the moment t1(t) and P2(t) averaging to obtain the average value P of the deaerator pressureV(t)。
(4) And acquiring the opening K (t) of the condenser water level recirculation regulating valve at the time t, and multiplying the opening K (t) by the correction coefficient A to convert the opening K (t) into a correction value Q (t).
Q(t)＝A×K(t) (2)
(5) Average value P of deaerator pressure at t momentV(t) taking the absolute value after the difference between the target value SP and the value SP to obtain a deviation value E (t).
E(t)＝|PV(t)-SP| (3)
(6) Converting the deviation value E (t) into a proportionality coefficient C through linearization processingP(t)。
| Deviation value E (t) | Coefficient of proportionality CP(t) |
| E(1) | CP(1) |
| E(2) | CP(2) |
| … | … |
| E(n) | CP(n) |
(7) And (4) outputting the opening degree ky (t) of the deaerator pressure regulating valve according to the following formula operation, and controlling the deaerator pressure regulating valve in real time so as to realize the pressure control of the deaerator.
Ky(t)＝CP(t)×E(t)+Q(t) (4)
Wherein, CP(t), E (t), Q (t) and the correction value are respectively the proportional coefficient, the deviation value and the correction value at time t.
In order to more clearly describe the embodiments of the present invention, the present invention is explained in detail below by a specific example.
The existing boiler system controls the pressure of a deaerator of the boiler system.
(1) And determining the pressure range of the deaerator to be 0.0-60.0 KPa and the target value SP to be 30.0KPa according to the pressure historical data of the deaerator.
(2) Acquiring a pressure value P of the deaerator at the moment t by adopting 2 deaerator pressure monitoring sensors1(t) 32.8KPa, P2(t) was 32.6 KPa.
(3) The pressure value P of the deaerator at the moment t1(t) and P2(t) averaging to obtain the average value P of the deaerator pressureV(t)。
(4) And acquiring the opening K (t) of the condenser water level recirculation regulating valve at the time t, and multiplying the opening K (t) by the correction coefficient A to convert the opening K (t) into a correction value Q (t).
When the condenser water level recirculation regulating valve opening degree K (t) is 50% at the time t and the correction coefficient A is 10, a correction value Q (t) is 5.
(5) Average value P of deaerator pressure at t momentV(t) taking the absolute value after the difference between the target value SP and the value SP to obtain a deviation value E (t).
E(t)＝|PV(t)-SP|＝|32.7-30|＝2.7KPa
(6) Obtaining a proportionality coefficient C by linearizing the deviation value E (t)P(t)。
| Deviation value E (t) | Coefficient of proportionality CP(t) |
| 0.0 | 0.0 |
| … | … |
| 30.0 | 3.0 |
The table is compared to obtain the proportionality coefficient CP(t) was 0.27.
(7) And (4) calculating and outputting the opening degree Ky (t) of the deaerator pressure regulating valve according to a formula (4), and controlling the deaerator pressure regulating valve in real time so as to control the deaerator pressure.
Claims (1)
1. A deaerator pressure control method is characterized by comprising the following steps:
(1) determining a deaerator pressure range and a target value SP according to deaerator pressure historical data;
(2) acquiring a pressure value P of the deaerator at the moment t by adopting 2 deaerator pressure monitoring sensors1(t) and P2(t)；
(3) The pressure value P of the deaerator at the moment t1(t) and P2(t) averaging to obtain the average value P of the deaerator pressureV(t)：
(4) And acquiring the opening K (t) of the condenser water level recirculation regulating valve at the time t, multiplying the opening K (t) by a correction coefficient A, and converting the opening K (t) into a correction value Q (t):
Q(t)＝A×K(t)；
(5) average value P of deaerator pressure at t momentV(t) obtaining an absolute value after the difference between the target value SP and the value SP, and obtaining a deviation value E (t):
E(t)＝|PV(t)-SP|；
(6) converting the deviation value E (t) into a proportionality coefficient C through linearization processingP(t)：
；
(7) The deaerator pressure regulating valve opening degree Ky (t) is output according to the following formula operation, the deaerator pressure regulating valve is controlled in real time, and then the deaerator pressure is controlled:
Ky(t)＝CP(t)×E(t)+Q(t)，
wherein, CP(t), E (t), Q (t) and the correction value are respectively the proportional coefficient, the deviation value and the correction value at time t.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111467427.9A CN114234171B (en) | 2021-12-02 | 2021-12-02 | Deaerator pressure control method |
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|---|---|---|---|
| CN202111467427.9A CN114234171B (en) | 2021-12-02 | 2021-12-02 | Deaerator pressure control method |
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| CN114234171A true CN114234171A (en) | 2022-03-25 |
| CN114234171B CN114234171B (en) | 2023-12-05 |
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Citations (13)
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|---|---|---|---|---|
| US4555906A (en) * | 1984-10-25 | 1985-12-03 | Westinghouse Electric Corp. | Deaerator pressure control system for a combined cycle steam generator power plant |
| US4819436A (en) * | 1988-05-26 | 1989-04-11 | General Electric Company | Deaerator pressure control system |
| CN102736640A (en) * | 2012-07-16 | 2012-10-17 | 中国神华能源股份有限公司 | System and method for controlling water level of deaerator |
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