CN114234172A - Deaerator water level control method - Google Patents
Deaerator water level control method Download PDFInfo
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- CN114234172A CN114234172A CN202111467430.0A CN202111467430A CN114234172A CN 114234172 A CN114234172 A CN 114234172A CN 202111467430 A CN202111467430 A CN 202111467430A CN 114234172 A CN114234172 A CN 114234172A
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- deaerator
- water
- water level
- value
- target value
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 152
- 238000000034 method Methods 0.000 title claims abstract description 12
- 230000001502 supplementing effect Effects 0.000 claims abstract description 16
- 238000012544 monitoring process Methods 0.000 claims abstract description 7
- 238000012935 Averaging Methods 0.000 claims abstract description 5
- 238000007599 discharging Methods 0.000 claims abstract description 4
- 239000013256 coordination polymer Substances 0.000 claims description 11
- 230000001105 regulatory effect Effects 0.000 claims description 10
- 239000013589 supplement Substances 0.000 claims description 7
- 230000001276 controlling effect Effects 0.000 claims description 6
- 230000003020 moisturizing effect Effects 0.000 claims description 2
- 238000005259 measurement Methods 0.000 abstract description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
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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
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Non-Electrical Variables (AREA)
Abstract
The invention aims to provide a deaerator water level control method, which is used for determining a deaerator water level range, a water supplementing target value and a water discharging target value; acquiring the water level value of the deaerator at the moment t by adopting 2 deaerator water level monitoring sensors; averaging the water level values of 2 deaerators at the time t to obtain an average water level value of the deaerators; and comparing the average value of the water level of the deaerator at the moment t with the water supplementing target value and the water discharging target value to obtain a water supplementing deviation value, and further realizing the water level control of the deaerator. The invention adopts 2 deaerator water level monitoring sensors to monitor the deaerator water level, and can reduce deaerator water level measurement errors; the invention can quickly and accurately control the water level of the deaerator through real-time operation.
Description
Technical Field
The invention relates to a control method of an industrial boiler, in particular to a control method of a deaerator.
Background
The deaerator is the core thermodynamic equipment of an industrial boiler system, and has the main functions of removing oxygen and other gases in boiler feed water, ensuring the quality of the feed water and reducing corrosion. Meanwhile, the deaerator also plays a role in heating the feed water and increasing the temperature of the feed water. The effect of oxygen-eliminating device water tank is the storage feedwater, and the difference of the oxygen-eliminating device water yield is sent into to the water supply volume of boiler and condensate pump to balanced feed-water pump, when the condensate water yield and water supply volume inconsistent, can satisfy the needs of boiler water supply volume through the height change regulation of the water level of oxygen-eliminating device water tank. If the water level of the deaerator is not well controlled, the boiler is easy to have safety accidents. Therefore, the deaerator water level control is an important link for ensuring the safe and stable operation of a boiler system, and is very necessary for quickly and accurately controlling the deaerator water level.
Disclosure of Invention
The invention aims to provide a deaerator water level control method for solving the deaerator water level control problem.
The purpose of the invention is realized as follows:
the invention discloses a deaerator water level control method, which is characterized by comprising the following steps:
(1) determining the range of the water level of the deaerator and a water supplementing target value S according to the historical data of the water level of the deaeratorBAnd a target value S of drainageP；
(2) Acquiring the water level value L of the deaerator at the moment of t by adopting 2 deaerator water level monitoring sensors1(t) and L2(t)；
(3) The water level value L of the deaerator at the time of t1(t) and L2(t) averaging to obtain the average value L of the deaerator water levelV(t)：
(4) And comparing the average water level LV (t) of the deaerator at the time t with the water supplementing target value SB and the water discharging target value SP so as to control the water level of the deaerator.
The present invention may further comprise:
1. if the average water level LV (t) of the deaerator at the time t is smaller than the water supplementing target value SB:
and (3) subtracting the average water level LV (t) of the deaerator at the time t from the water supplementing target value SB, and then taking an absolute value to obtain a water supplementing deviation value EB (t):
EB(t)＝|LV(t)-SB|；
deviation value E of water supplementB(t) converting the water into a water-replenishing integral coefficient C by linearizationB(t)：
| Water supplement deviation value EB(t) | Integral coefficient of water supply CB(t) |
| EB(1) | CB(1) |
| EB(2) | CB(2) |
| … | … |
| EB(n) | CB(n) |
The opening K of a water replenishing regulating valve of the deaerator is output according to the following formulaB(t), control the oxygen-eliminating device moisturizing governing valve in real time, and then realize the control to the oxygen-eliminating device water level:
wherein, CB(t)、EBAnd (t) is an integral coefficient at the moment t and a water replenishing deviation value respectively.
2. If t moment deaerator water level average value LV(t) is greater than the target value SPAnd then:
average value L of water level of deaerator at t momentV(t) and a target value S for drainagePTaking an absolute value after difference is made to obtain a drainage deviation value EP(t)：
EP(t)＝|LV(t)-SP|；
Deviation value E of water dischargeP(t) converting the water into a water discharge integral coefficient C by linearizationP(t)：
| Deviation value of drainage EP(t) | Integral coefficient of drainage CP(t) |
| EP(1) | CP(1) |
| EP(2) | CP(2) |
| … | … |
| EP(n) | CP(n) |
The opening K of the water discharge regulating valve of the deaerator is output according to the following formulaP(t), control the deaerator drainage governing valve in real time, and then realize the control to deaerator water level:
wherein, CP(t)、EP(t) integration at time tCoefficient, drainage deviation value.
The invention has the advantages that:
1. the invention adopts 2 deaerator water level monitoring sensors to monitor the deaerator water level, and can reduce deaerator water level measurement errors.
2. The invention can improve the control precision through integral control.
3. The invention can quickly and accurately control the water level 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) determining the range of the water level of the deaerator and a water supplementing target value S according to the historical data of the water level of the deaeratorBAnd a target value S of drainageP。
(2) Acquiring the water level value L of the deaerator at the moment of t by adopting 2 deaerator water level monitoring sensors1(t) and L2(t)。
(3) The water level value L of the deaerator at the time of t1(t) and L2(t) averaging to obtain the average value L of the deaerator water levelV(t)。
(4) Average value L of water level of deaerator at t momentV(t) and a target value S for water supplyBTarget value S of drainageP
And (3) comparison:
1) if t moment deaerator water level average value LV(t) is less than the target value SBThen, then
a) Average value L of water level of deaerator at t momentV(t) and a target value S for water supplyBTaking an absolute value after difference is made to obtain a water replenishing deviation valueEB(t)。
EB(t)＝|LV(t)-SB| (2)
b) Deviation value E of water supplementB(t) converting the water into a water-replenishing integral coefficient C by linearizationB(t)。
c) The opening K of a water replenishing regulating valve of the deaerator is output according to the following formulaBAnd (t) controlling a water replenishing regulating valve of the deaerator in real time, and further realizing water level control of the deaerator.
Wherein, CB(t)、EBAnd (t) is an integral coefficient at the moment t and a water replenishing deviation value respectively.
2) If t moment deaerator water level average value LV(t) is greater than the target value SPThen, then
a) Average value L of water level of deaerator at t momentV(t) and a target value S for drainagePTaking an absolute value after difference is made to obtain a drainage deviation value EP(t)。
EP(t)＝|LV(t)-SP| (4)
b) Deviation value E of water dischargeP(t) converting the water into a water discharge integral coefficient C by linearizationP(t)。
c) The opening K of the water discharge regulating valve of the deaerator is output according to the following formulaPAnd (t) controlling the deaerator drainage regulating valve in real time so as to realize the water level control of the deaerator.
Wherein, CP(t)、EPAnd (t) is an integral coefficient at the time t and a drainage deviation value.
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 water level of a deaerator of the boiler system.
(1) According to the water level historical data of the deaerator, determining the water level range of the deaerator to be 1000mm and a water supplementing target value SBIs 500mm and a target value S of water dischargePIs 700 mm.
(2) Acquiring the water level value L of the deaerator at the moment of t by adopting 2 deaerator water level monitoring sensors1(t) is 327mm and L2(t) 329 mm.
(3) And averaging the water level values L1(t) and L2(t) of the deaerator at the time t to obtain an average water level value LV (t) of the deaerator.
(4) Average value L of water level of deaerator at t momentV(t) and a target value S for water supplyBTarget value S of drainagePAnd (3) comparison:
comparing, if the average value 328mm of the water level of the deaerator at the time t is smaller than the water supplementing target value 500mm, then
a) Average value L of water level of deaerator at t momentV(t) and a target value S for water supplyBTaking an absolute value after difference is made to obtain a water replenishing deviation value EB(t)。
EB(t)＝|328-500|＝172mm
b) Deviation value E of water supplementB(t) is converted into an integral coefficient C by linearizationB(t)。
According to the table, the water supplement deviation value is converted into an integral coefficient of 0.118 through linearization treatment.
c) The opening K of a water replenishing regulating valve of the deaerator is output according to the following formulaBAnd (t) controlling a water replenishing regulating valve of the deaerator in real time, and further realizing water level control of the deaerator.
KB(t)＝0.118×172＝20.3。
Claims (3)
1. A deaerator water level control method is characterized by comprising the following steps:
(1) determining the range of the water level of the deaerator and a water supplementing target value S according to the historical data of the water level of the deaeratorBAnd a target value S of drainageP；
(2) Acquiring the water level value L of the deaerator at the moment of t by adopting 2 deaerator water level monitoring sensors1(t) and L2(t)；
(3) The water level value L of the deaerator at the time of t1(t) and L2(t) averaging to obtain the average value L of the deaerator water levelV(t)：
(4) And comparing the average water level LV (t) of the deaerator at the time t with the water supplementing target value SB and the water discharging target value SP so as to control the water level of the deaerator.
2. The method for controlling the water level of the deaerator as claimed in claim 1, wherein the method comprises the following steps:
if the average water level LV (t) of the deaerator at the time t is smaller than the water supplementing target value SB:
and (3) subtracting the average water level LV (t) of the deaerator at the time t from the water supplementing target value SB, and then taking an absolute value to obtain a water supplementing deviation value EB (t):
EB(t)＝|LV(t)-SB|；
deviation value E of water supplementB(t) converting the water into a water-replenishing integral coefficient C by linearizationB(t)：
The opening K of a water replenishing regulating valve of the deaerator is output according to the following formulaB(t), control the oxygen-eliminating device moisturizing governing valve in real time, and then realize the control to the oxygen-eliminating device water level:
wherein, CB(t)、EBAnd (t) is an integral coefficient at the moment t and a water replenishing deviation value respectively.
3. The method for controlling the water level of the deaerator as claimed in claim 1, wherein the method comprises the following steps:
if t moment deaerator water level average value LV(t) is greater than the target value SPAnd then:
average value L of water level of deaerator at t momentV(t) and a target value S for drainagePTaking an absolute value after difference is made to obtain a drainage deviation value EP(t)：
EP(t)＝|LV(t)-SP|；
Deviation value E of water dischargeP(t) converting the water into a water discharge integral coefficient C by linearizationP(t)：
The opening K of the water discharge regulating valve of the deaerator is output according to the following formulaP(t), control the deaerator drainage governing valve in real time, and then realize the control to deaerator water level:
wherein, CP(t)、EPAnd (t) is an integral coefficient at the time t and a drainage deviation value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111467430.0A CN114234172A (en) | 2021-12-02 | 2021-12-02 | Deaerator water level control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111467430.0A CN114234172A (en) | 2021-12-02 | 2021-12-02 | Deaerator water level control method |
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| Publication Number | Publication Date |
|---|---|
| CN114234172A true CN114234172A (en) | 2022-03-25 |
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| CN202111467430.0A Pending CN114234172A (en) | 2021-12-02 | 2021-12-02 | Deaerator water level control method |
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Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07269950A (en) * | 1994-03-29 | 1995-10-20 | Noritz Corp | Hot water supplying apparatus |
| JPH11287405A (en) * | 1998-04-01 | 1999-10-19 | Meidensha Corp | Water level control device for boiler |
| JP2010216731A (en) * | 2009-03-17 | 2010-09-30 | Chugoku Electric Power Co Inc:The | Power generation unit |
| CN103116367A (en) * | 2013-01-29 | 2013-05-22 | 中国水利水电科学研究院 | Automatic control method and system for tail gate water level in river model |
| CN203573174U (en) * | 2013-11-04 | 2014-04-30 | 大唐华银电力股份有限公司金竹山火力发电分公司 | Deoxygenator water level automatic control system |
| CN103811089A (en) * | 2012-11-13 | 2014-05-21 | 中国广东核电集团有限公司 | Nuclear power station secondary circuit deaerator and liquid level control method thereof |
| CN204287991U (en) * | 2014-12-24 | 2015-04-22 | 大唐贵州发耳发电有限公司 | A kind of deaerator level automatic control system |
| CN104656688A (en) * | 2014-12-24 | 2015-05-27 | 大唐贵州发耳发电有限公司 | Novel deaerator water level control system |
| CN104714566A (en) * | 2015-01-08 | 2015-06-17 | 华北电力大学 | Condensation water throttle control system and safety control method thereof |
| CN110703827A (en) * | 2019-11-12 | 2020-01-17 | 深圳市英威腾电气股份有限公司 | Edge sealing adhesive temperature control system and temperature control method thereof |
| CN111399556A (en) * | 2020-03-26 | 2020-07-10 | 华润电力技术研究院有限公司 | Control method and control system for deaerator water level and computer storage medium |
| JP2021063619A (en) * | 2019-10-16 | 2021-04-22 | 三浦工業株式会社 | Control device for boiler |
| CN113483319A (en) * | 2021-07-08 | 2021-10-08 | 西安热工研究院有限公司 | Variable-frequency energy-saving optimization control system and method for condensate pump of thermal power generating unit |
-
2021
- 2021-12-02 CN CN202111467430.0A patent/CN114234172A/en active Pending
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07269950A (en) * | 1994-03-29 | 1995-10-20 | Noritz Corp | Hot water supplying apparatus |
| JPH11287405A (en) * | 1998-04-01 | 1999-10-19 | Meidensha Corp | Water level control device for boiler |
| JP2010216731A (en) * | 2009-03-17 | 2010-09-30 | Chugoku Electric Power Co Inc:The | Power generation unit |
| CN103811089A (en) * | 2012-11-13 | 2014-05-21 | 中国广东核电集团有限公司 | Nuclear power station secondary circuit deaerator and liquid level control method thereof |
| CN103116367A (en) * | 2013-01-29 | 2013-05-22 | 中国水利水电科学研究院 | Automatic control method and system for tail gate water level in river model |
| CN203573174U (en) * | 2013-11-04 | 2014-04-30 | 大唐华银电力股份有限公司金竹山火力发电分公司 | Deoxygenator water level automatic control system |
| CN204287991U (en) * | 2014-12-24 | 2015-04-22 | 大唐贵州发耳发电有限公司 | A kind of deaerator level automatic control system |
| CN104656688A (en) * | 2014-12-24 | 2015-05-27 | 大唐贵州发耳发电有限公司 | Novel deaerator water level control system |
| CN104714566A (en) * | 2015-01-08 | 2015-06-17 | 华北电力大学 | Condensation water throttle control system and safety control method thereof |
| JP2021063619A (en) * | 2019-10-16 | 2021-04-22 | 三浦工業株式会社 | Control device for boiler |
| CN110703827A (en) * | 2019-11-12 | 2020-01-17 | 深圳市英威腾电气股份有限公司 | Edge sealing adhesive temperature control system and temperature control method thereof |
| CN111399556A (en) * | 2020-03-26 | 2020-07-10 | 华润电力技术研究院有限公司 | Control method and control system for deaerator water level and computer storage medium |
| CN113483319A (en) * | 2021-07-08 | 2021-10-08 | 西安热工研究院有限公司 | Variable-frequency energy-saving optimization control system and method for condensate pump of thermal power generating unit |
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Application publication date: 20220325 |
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