CN114234171B - Deaerator pressure control method - Google Patents
Deaerator pressure control method Download PDFInfo
- Publication number
- CN114234171B CN114234171B CN202111467427.9A CN202111467427A CN114234171B CN 114234171 B CN114234171 B CN 114234171B CN 202111467427 A CN202111467427 A CN 202111467427A CN 114234171 B CN114234171 B CN 114234171B
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- Prior art keywords
- deaerator
- pressure
- value
- regulating valve
- moment
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- 238000000034 method Methods 0.000 title claims abstract description 8
- 238000012937 correction Methods 0.000 claims abstract description 17
- 230000001105 regulatory effect Effects 0.000 claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 12
- 238000012544 monitoring process Methods 0.000 claims abstract description 7
- 238000012935 Averaging Methods 0.000 claims abstract description 5
- 238000004064 recycling Methods 0.000 claims abstract description 4
- 230000001276 controlling effect Effects 0.000 claims description 4
- 238000009530 blood pressure measurement Methods 0.000 abstract description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000010438 heat treatment Methods 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
- 231100001010 corrosive Toxicity 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000007789 gas Substances 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
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
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physical Water Treatments (AREA)
Abstract
The invention aims to provide a deaerator pressure control method, which is used for determining the deaerator pressure range and target value according to deaerator pressure history data; 2 deaerator pressure monitoring sensors are adopted to obtain deaerator pressure values at the moment t; averaging the pressure values of the 2 deaerators at the time t to obtain an average pressure value of the deaerators; acquiring the opening of a condenser water level recycling 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 difference between the pressure average value of the deaerator at the moment t and the target value to obtain an offset value; converting the deviation value into a proportional coefficient through linearization; and the opening of the deaerator pressure regulating valve is calculated and output, so that the deaerator pressure regulating valve is controlled in real time, and further the deaerator pressure is controlled. The deaerator pressure measurement error can be reduced; the opening degree of the condenser water level recycling regulating valve is converted into a correction value, so that the control precision can be improved, and the pressure of the deaerator can be rapidly 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 the key devices of the boiler control system, and has the function of heating the 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 the corrosion of boiler feed water pipes, economizers and other accessory devices. If the deaerator is improperly controlled in pressure, poor deaeration capacity is caused, and corrosion is caused to boiler water supply pipelines, economizers and other accessory equipment. Corrosives can enter the boiler and deposit or attach on the wall and heating surface of the boiler to form indissolvable iron scale with poor heat transfer, and when the pipeline is severely corroded, pipeline explosion accidents are easy to occur. Therefore, a rapid and accurate control of deaerator pressure is necessary.
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 in the following way:
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) 2 deaerator pressure monitoring sensors are adopted to obtain deaerator pressure value P at t moment 1 (t) and P 2 (t)；
(3) The pressure value P of the deaerator at the moment t 1 (t) and P 2 (t) averaging to obtain an average pressure P of the deaerator V (t)：
(4) The opening K (t) of the condenser water level recycling regulating valve at the moment t is obtained, and is multiplied by a correction coefficient A to be converted into a correction value Q (t):
Q(t)＝A×K(t)；
(5) Average pressure P of deaerator at t moment V And (t) obtaining a deviation value E (t) after the deviation is made from the target value SP:
E(t)＝P V (t)-SP；
(6) The absolute value of the deviation value E (t) is converted into a proportional coefficient C through linearization P (t)：
| Deviation value E (t) | Scaling factor C P (t) |
| |E(1)| | C P (1) |
| |E(2)| | C P (2) |
| … | … |
| |E(n)| | C P (n) |
(7) Outputting the opening Ky (t) of the deaerator pressure regulating valve according to the following operation, and controlling the deaerator pressure regulating valve in real time, thereby realizing the control of deaerator pressure:
Ky(t)＝C P (t)×E(t)+Q(t)，
wherein C is P And (t), E (t) and Q (t) are respectively proportional coefficient, offset value and correction value at time t.
The invention has the advantages that:
1. according to the deaerator pressure monitoring system, 2 deaerator pressure monitoring sensors are adopted to monitor deaerator pressure, so that deaerator pressure measurement errors can be reduced.
2. The invention converts the opening of the condenser water level recirculation regulating valve into the correction value, thereby improving the control precision.
3. The pressure of the deaerator can be rapidly and accurately controlled 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 is described in more detail below, by way of example, with reference to the accompanying drawings:
referring to fig. 1, the present invention includes the steps of:
(1) And determining the pressure range and the target value SP of the deaerator according to the deaerator pressure history data.
(2) 2 deaerator pressure monitoring sensors are adopted to obtain deaerator pressure value P at t moment 1 (t) and P 2 (t)。
(3) The pressure value P of the deaerator at the moment t 1 (t) and P 2 (t) averaging to obtain an average pressure P of the deaerator V (t)。
(4) The condenser water level recirculation regulating valve opening degree K (t) at time t is obtained and multiplied by the correction coefficient a to be converted into a correction value Q (t).
Q(t)＝A×K(t) (2)
(5) Average pressure P of deaerator at t moment V And (t) obtaining a deviation value E (t) after the deviation is made from the target value SP:
E(t)＝P V (t)-SP； (3)
(6) The absolute value of the deviation value E (t) is converted into a proportional coefficient C through linearization P (t)：
| Deviation value E (t) | Scaling factor C P (t) |
| |E(1)| | C P (1) |
| |E(2)| | C P (2) |
| … | … |
| |E(n)| | C P (n) |
(7) And outputting the opening Ky (t) of the deaerator pressure regulating valve according to the following operation, and controlling the deaerator pressure regulating valve in real time so as to realize deaerator pressure control.
Ky(t)＝C P (t)×E(t)+Q(t) (4)
Wherein C is P And (t), E (t) and Q (t) are respectively proportional coefficient, offset value and correction value at time t.
In order to more clearly describe the embodiments of the present invention, the present invention will be described in detail by way of a specific example.
The existing boiler system controls the pressure of the deaerator.
(1) And determining that the pressure range of the deaerator is 0.0-60.0 KPa according to the deaerator pressure history data, and the target value SP is 30.0KPa.
(2) 2 deaerator pressure monitoring sensors are adopted to obtain deaerator pressure value P at t moment 1 (t) is 32.8KPa, P 2 (t) was 32.6KPa.
(3) The pressure value P of the deaerator at the moment t 1 (t) and P 2 (t) averaging to obtain an average pressure P of the deaerator V (t)。
(4) The condenser water level recirculation regulating valve opening degree K (t) at time t is obtained and multiplied by the correction coefficient a to be converted into a correction value Q (t).
When the condenser water level recirculation control valve opening K (t) is 50% and the correction coefficient a is 10, the correction value Q (t) is 5.
(5) Average pressure P of deaerator at t moment V And (t) obtaining a deviation value E (t) after the deviation is made from the target value SP:
E(t)＝P V (t)-SP＝32.7-30＝2.7KPa
(6) The absolute value of the deviation value E (t) is converted into a proportional coefficient C through linearization P (t)：。
| Deviation value E (t) | Scaling factor C P (t) |
| |0.0| | 0.0 |
| … | … |
| |30.0| | 3.0 |
The proportion coefficient C is obtained by comparing the table P (t) is 0.27.
(7) And (3) calculating and outputting the opening Ky (t) of the deaerator pressure regulating valve according to the formula (4), and controlling the deaerator pressure regulating valve in real time so as to realize the control of deaerator pressure.
Claims (1)
1. A deaerator pressure control method is characterized in that:
(1) Determining a deaerator pressure range and a target value SP according to deaerator pressure historical data;
(2) 2 deaerator pressure monitoring sensors are adopted to obtain deaerator pressure value P at t moment 1 (t) and P 2 (t)；
(3) The pressure value P of the deaerator at the moment t 1 (t) and P 2 (t) averaging to obtain an average pressure P of the deaerator V (t)：
(4) The opening K (t) of the condenser water level recycling regulating valve at the moment t is obtained, and is multiplied by a correction coefficient A to be converted into a correction value Q (t):
Q(t)＝A×K(t)；
(5) Average pressure P of deaerator at t moment V And (t) obtaining a deviation value E (t) after the deviation is made from the target value SP:
E(t)＝P V (t)-SP；
(6) The absolute value of the deviation value E (t) is converted into a proportional coefficient C through linearization P (t)：
(7) Outputting the opening Ky (t) of the deaerator pressure regulating valve according to the following operation, and controlling the deaerator pressure regulating valve in real time, thereby realizing the control of deaerator pressure:
Ky(t)＝C P (t)×E(t)+Q(t)，
wherein C is P And (t), E (t) and Q (t) are respectively proportional coefficient, offset value and 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 |
Applications Claiming Priority (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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| Publication Number | Publication Date |
|---|---|
| CN114234171A CN114234171A (en) | 2022-03-25 |
| CN114234171B true CN114234171B (en) | 2023-12-05 |
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Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN103292311A (en) * | 2013-05-31 | 2013-09-11 | 际华三五三九制鞋有限公司 | Heat filler type deaerator with stable deaerating function and atomizing function |
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