CN116085774A - Boiler water level control method - Google Patents
Boiler water level control method Download PDFInfo
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- CN116085774A CN116085774A CN202211575423.7A CN202211575423A CN116085774A CN 116085774 A CN116085774 A CN 116085774A CN 202211575423 A CN202211575423 A CN 202211575423A CN 116085774 A CN116085774 A CN 116085774A
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- water level
- boiler
- value
- boiler water
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/42—Applications, arrangements, or dispositions of alarm or automatic safety devices
- F22B37/46—Applications, arrangements, or dispositions of alarm or automatic safety devices responsive to low or high water level, e.g. for checking, suppressing, extinguishing combustion in boilers
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- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
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- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
Abstract
The invention aims to provide a boiler water level control method, which is used for determining a boiler water level range and a target value according to boiler water level historical data; 2 boiler water level monitoring sensors are adopted to obtain a boiler water level value at the moment t; averaging 2 boiler water level values at the moment t to obtain an average value of the boiler water level; taking an absolute value after the average value of the boiler water level at the moment t is differed from the target value to obtain an offset value; converting the deviation value into a proportional coefficient through linearization; acquiring a boiler steam pressure value at the moment t, and converting the boiler steam pressure value into an integral coefficient through linearization; the opening degree of the boiler water supply regulating valve is controlled in real time, so that the water level of the boiler is controlled. According to the invention, 2 boiler water level monitoring sensors are adopted to monitor the boiler water level, so that the measurement error can be reduced; the steam pressure of the boiler is converted into an integral coefficient, so that the control precision can be improved; the invention has simple operation and convenient realization.
Description
Technical Field
The invention relates to a boiler control method, in particular to a water level control method.
Background
Boiler plants have become an important component of industrial thermodynamic systems and play a vital role in industrial production. The control of the water level is one of the particularly important parameters during normal operation of the boiler. The main purpose of controlling the water supply of the boiler drum is to ensure the water level of the drum to be in an allowable range, so that the safe and stable operation of the boiler can be ensured. If the boiler water level control is not good, safety accidents are easy to happen. Therefore, a reasonable control method is necessary to control the boiler water level rapidly and accurately.
Disclosure of Invention
The invention aims to provide a boiler water level control method capable of solving the problems of boiler water level control and the like.
The purpose of the invention is realized in the following way:
the invention relates to a boiler water level control method, which is characterized by comprising the following steps:
(1) Determining the water level range and target value S of the boiler according to the historical data of the water level of the boiler P ；
(2) 2 boiler water level monitoring sensors are adopted to obtain a boiler water level value L of the 2 boiler water level monitoring sensors at the moment t 1 (t) and L 2 (t)；
(3) The boiler water level value L at the moment t 1 (t) and L 2 (t) taking an average value to obtain an average value L of the water level of the boiler V (t)：
(4) Average value L of water level of boiler at t moment V (t) and the target value S P Taking absolute value after making difference to obtain a deviation value E (t):
E(t)＝|L V (t)-S P |；
(5) Converting the deviation value E (t) into a proportionality coefficient C through linearization P (t)：
(6) The boiler steam pressure value P (t) at the moment t is obtained and converted into an integral coefficient C through linearization B (t)：
| Steam pressure value P (t) | Integral coefficient C B (t) |
| P(1) | C B (1) |
| P(2) | C B (2) |
| … | … |
| P(n) | C B (n) |
；
(7) The opening degree of the boiler water supply regulating valve is controlled in real time, so that the water level of the boiler is controlled.
The invention may further include:
1. when the average value L of the water level of the boiler V (t) is smaller than the target value S P When the boiler feed water regulating valve opening K (t) is opened according to the following steps:
when the average value L of the water level of the boiler V (t) is greater than the target value S P When the boiler water supply regulating valve opening K (t) is closed according to the above mode;
wherein C is P (t)、C B And (t) and E (t) are proportional coefficient, integral coefficient and deviation value respectively at the moment t.
The invention has the advantages that:
1. the invention adopts 2 boiler water level monitoring sensors to monitor the boiler water level, and can reduce measurement errors.
2. The invention converts the steam pressure of the boiler into the integral coefficient, and can improve the control precision.
3. 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 method for controlling the water level of a boiler according to the present invention comprises the steps of:
(1) Determining the water level range and target value S of the boiler according to the historical data of the water level of the boiler P 。
(2) 2 boiler water level monitoring sensors are adopted to obtain a boiler water level value L at the moment t 1 (t) and L 2 (t)。
(3) The boiler water level value L at the moment t 1 (t) and L 2 (t) taking an average value to obtain an average value L of the water level of the boiler V (t)。
(4) Average value L of water level of boiler at t moment V (t) and the target value S P Taking absolute value after making difference to obtain deviation value E (t).
E(t)＝|L V (t)-S P | (2)
(5) Converting the deviation value E (t) into a proportionality 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) |
(6) The boiler steam pressure value P (t) at the moment t is obtained and converted into an integral coefficient C through linearization B (t)。
| Steam pressure value P (t) | Integral coefficient C B (t) |
| P(1) | C B (1) |
| P(2) | C B (2) |
| … | … |
| P(n) | C B (n) |
(7) The opening degree of the boiler water supply regulating valve is controlled in real time, so that the water level of the boiler is controlled.
a) When the average value L of the water level of the boiler V (t) is smaller than the target value S P When the boiler feed water regulating valve opening K (t) is opened according to the following method.
b) When the average value L of the water level of the boiler V (t) is greater than the target value S P And (3) closing the opening K (t) of the boiler feed water regulating valve according to the formula.
Wherein C is P (t)、C B And (t) and E (t) are proportional coefficient, integral coefficient and deviation value respectively at the moment t.
Examples:
it is assumed that a boiler system is available for controlling the water level of the boiler.
(1) According to the boiler water level history data, determining the boiler water level measuring range to be 0-600 mm and the target value S P 300mm.
(2) 2 boiler water level monitoring sensors are adopted to obtain a boiler water level value L at the moment t 1 (t) 240mm and L 2 (t) was 244mm.
(3) The boiler water level value L at the moment t 1 (t) and L 2 (t) taking an average value to obtain an average value L of the water level of the boiler V (t)。
(4) Will be at tAverage value L of water level of carved boiler V (t) and the target value S P Taking absolute value after making difference to obtain deviation value E (t).
E(t)＝|242-300|＝58mm
(5) Converting the deviation value E (t) into a proportionality coefficient C through linearization P (t)。
| Deviation value E (t) | Scaling factor C P (t) |
| 0 | 0 |
| … | … |
| 300 | 0.1 |
The proportion coefficient C is obtained by comparing the table P (t) was 0.02.
(6) The boiler steam pressure value P (t) at the moment t is obtained to be 3.5MPa, and is converted into an integral coefficient C through linearization B (t)。
| Steam pressure value P (t) | Integral coefficient C B (t) |
| 0 | 0 |
| … | … |
| 7 | 0.06 |
The integral coefficient C is obtained by comparing the table B (t) was 0.03.
(7) The opening degree of the boiler water supply regulating valve is controlled in real time, so that the water level of the boiler is controlled. Due to the average value L of the water level of the boiler V (t) is smaller than the target value S P And opening the boiler feed water regulating valve K (t) according to the formula (3).
K(t)＝0.02×58+0.03×58＝2.9。
Claims (2)
1. A boiler water level control method is characterized in that:
(1) Determining the water level range and target value S of the boiler according to the historical data of the water level of the boiler P ；
(2) 2 boiler water level monitoring sensors are adopted to obtain a boiler water level value L of the 2 boiler water level monitoring sensors at the moment t 1 (t) and L 2 (t)；
(3) The boiler water level value L at the moment t 1 (t) and L 2 (t) taking an average value to obtain an average value L of the water level of the boiler V (t)：
(4) Average value L of water level of boiler at t moment V (t) and the target value S P Taking absolute value after making difference to obtain a deviation value E (t):
E(t)＝|L V (t)-S P |；
(5) Converting the deviation value E (t) into a proportionality coefficient C through linearization P (t)：
；
(6) The boiler steam pressure value P (t) at the moment t is obtained and converted into an integral coefficient C through linearization B (t)：
；
(7) The opening degree of the boiler water supply regulating valve is controlled in real time, so that the water level of the boiler is controlled.
2. The boiler water level control method according to claim 1, characterized in that:
when the average value L of the water level of the boiler V (t) is smaller than the target value S P When the boiler feed water regulating valve opening K (t) is opened according to the following steps:
when the average value L of the water level of the boiler V (t) is greater than the target value S P When the boiler water supply regulating valve opening K (t) is closed according to the above mode;
wherein C is P (t)、C B And (t) and E (t) are proportional coefficient, integral coefficient and deviation value respectively at the moment t.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211575423.7A CN116085774A (en) | 2022-12-08 | 2022-12-08 | Boiler water level control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211575423.7A CN116085774A (en) | 2022-12-08 | 2022-12-08 | Boiler water level control method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116085774A true CN116085774A (en) | 2023-05-09 |
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ID=86212800
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211575423.7A Pending CN116085774A (en) | 2022-12-08 | 2022-12-08 | Boiler water level control method |
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| Country | Link |
|---|---|
| CN (1) | CN116085774A (en) |
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- 2022-12-08 CN CN202211575423.7A patent/CN116085774A/en active Pending
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