CN115264485A - Water level automatic control system for water storage tank of supercritical boiler - Google Patents
Water level automatic control system for water storage tank of supercritical boiler Download PDFInfo
- Publication number
- CN115264485A CN115264485A CN202211178349.5A CN202211178349A CN115264485A CN 115264485 A CN115264485 A CN 115264485A CN 202211178349 A CN202211178349 A CN 202211178349A CN 115264485 A CN115264485 A CN 115264485A
- Authority
- CN
- China
- Prior art keywords
- module
- output
- electrically connected
- input
- storage tank
- 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.)
- Granted
Links
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
- F22D5/00—Controlling water feed or water level; Automatic water feeding or water-level regulators
- F22D5/26—Automatic feed-control systems
- F22D5/34—Applications of valves
Abstract
The invention provides a water level automatic control system of a water storage tank of a supercritical boiler, belonging to the technical field of water level automatic control of the water storage tank of the boiler; the technical problem to be solved is as follows: the improvement of the water level automatic control system structure of the water storage tank of the supercritical boiler is provided; the technical scheme for solving the technical problem is as follows: the output end of the water level transmitter of the water storage tank is electrically connected with the input end of the differential module, the input end of the high selection module and the first input end of the subtracter module; the output end of the differential module is electrically connected with the input end of the low-selection module and the input end of the high-selection module, the output end of the high-selection module is respectively electrically connected with the input end of the negation module and the first input end of the phase-and-module, the output end of the negation module is electrically connected with the first input end of the phase-and-module, and the output end of the low-selection module is electrically connected with the second input end of the phase-and-module; the output end of the negation module is also electrically connected with the first input end of the phase and module; the invention is applied to the water level control place of the water storage tank of the supercritical boiler.
Description
Technical Field
The invention discloses a water level automatic control system of a water storage tank of a supercritical boiler, belonging to the technical field of water level automatic control of the water storage tank of the boiler.
Background
At present, supercritical boilers are widely applied to thermal power plants, in order to provide the water supply quantity required by safety for the supercritical boilers in the starting stage, the boilers must be provided with corresponding starting systems at the control end, and good water supply quality conditions are obtained based on the systems so as to achieve the purposes of quick ignition, temperature rise and pressure rise.
At present, two water level regulating valves are arranged on a pipeline of a supercritical boiler starting system, the opening degree of a water level control valve of a water storage tank needs to be controlled in real time according to different water level pressure difference values, and during the operation of a unit, the water level of the water storage tank needs to be controlled rapidly according to different operation working conditions due to frequent water level changes of the water storage tank so as to ensure the safe and stable operation of the unit, and most of the existing water level control methods adopt manual control, so that the working strength of personnel is high; or adopt conventional PID automatic control, but the water level control quality is poor, response time is slow, in addition because the steam-water expansion phenomenon in the boiler start-up process leads to the water storage tank water level to fluctuate by a wide margin, the water level fluctuation can also lead to the problem that water level control valve equipment frequently carries out the operation of little aperture and damages, causes the water storage tank full water or zero water level phenomenon simultaneously easily, brings great hidden danger to supercritical boiler's safety and stability, consequently needs to improve current water level control system structure.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to solve the technical problems that: provides an improvement of a water level automatic control system structure of a water storage tank of a supercritical boiler.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: the utility model provides a supercritical boiler water storage tank water level automatic control system, includes water storage tank water level changer PT1 and boiler load changer PT2, its characterized in that: the automatic control system also comprises a differential module M1, a high selection module M2, a low selection module M3, an negation module M4, a high selection module M5, a phase and module M6, a phase and module M7, a memory generator module M8, a set value module M9, a set value module M10, a switching module M11, a function generator module M12, a subtracter module M13, a function generator module M14, a function generator module M15, an adder module M16 and an adder module M17, and the automatic control system has the structure that:
the output end of the water storage tank water level transmitter PT1 is respectively connected with the input end of the differential module M1
Input end of high-selection module M2
A first input end of the subtracter module M13
Electrically connecting; the output end O of the differential module M1 1 Respectively with the input of the low selection module M3
Input end of high-selection module M5
Electrically connected, the output O of the high selection module M2 2 Respectively connected with the input end of the negation module M4
First input terminal of AND module M6
Electrically connected, the output O of the negating module M4 4 First input terminal of AND module M6
Electrically connected, the output O of the low selection module M3 3 Second input terminal of AND module M6
Electrically connecting;
output end O of the negating module M4 4 And also with the first input of the module M7
Electrically connected, the output O of the high selection module M5 5 Second input terminal of AND module M7
Electrically connecting;
output O of the AND module M6 6 The setting end S of the memory generator module M8 is electrically connected;
output O of the AND module M7 7 Is electrically connected with the reset terminal R of the memory generator module M8;
output O of the memory generator module M8 8 A switching end S electrically connected with the switching module M11, an output end O of the set value module M9 9 And a first input terminal of the switching module M11
Electrical connection, the output O of the setpoint module M10 10 And a second input terminal of the switching module M11
Electrically connecting;
the output end of the boiler load transmitter PT2 and the input end of the function generator module M12
Electrically connected, the output O of the function generator module M12 12 And a second input terminal of the subtractor module M13
Electrically connected to the output O of the subtractor module M13 13 Respectively connected with the input end of the function generator module M14
Input end of function generator module M15
Electrically connecting;
the output end O of the function generator module M14 14 And a first input of the adder module M17
Electrically connected, output O of the adder module M17 17 Is electrically connected with the valve control unit of the water storage tank A;
output end O of function generator module M15 15 And a first input of the adder module M16
Electrically connected to the output O of the adder module M16 16 Is electrically connected with the valve control unit of the water storage tank B;
output end O of the switching module M11 11 Respectively connected to second inputs of adder modules M17
A second input of the adder module M16
And (6) electrically connecting.
Compared with the prior art, the invention has the following beneficial effects: the water level control system of the water storage tank of the supercritical boiler solves the problem of water level control of the water storage tank of the supercritical boiler, avoids the problem that a water level control valve is damaged due to frequent small-opening operation caused by large fluctuation of the water level, additionally acquires a feedforward signal based on the water level change rate in order to prevent the water level of the water storage tank from fluctuating greatly due to steam-water expansion in the starting process of the boiler, and can realize automatic control in the whole process, has good operation effect, reduces the workload of operators, and better ensures the safe and stable operation of a unit during the operation of the unit aiming at different stages of cold water feeding, ignition, load carrying, dry-wet state conversion and the like of the water storage tank.
Drawings
The invention is further described below with reference to the accompanying drawings:
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a functional diagram of the main control module according to the present invention.
Detailed Description
As shown in fig. 1 and 2, the present invention specifically provides an automatic control system for the water level of a water storage tank of a supercritical boiler, which perfects an automatic control strategy for the water level of the water storage tank, and solves the problem that the valve is damaged due to frequent small-opening operation of the water level control valve caused by the fluctuation of the water level.
The invention provides an automatic control system for the water level of a water storage tank of a supercritical boiler, which mainly comprises a water storage tank water level transmitter, a set value module, an inverting module, a switching module, a phase and phase module, an adder module, a subtracter module, a memory generator module, a differential module, a high selection module, a low selection module, a function generator and other control modules.
Wherein, the output end of the water level transmitter PT1 of the water storage tank and the input end of the differential module M1
Connected to, and simultaneously connected to, the input of the high selection module M2
Connected to the output O of the differential module M1 1 And the input end of the low selection module M3
Connected to the output O of the differential module M1 1 And the input end of the high selection module M5
Output O of connected, high-selection module M2 2 And the input end of the negation module M4
Output end O of connecting and negating module M4 4 First input terminal of AND module M6
Output O of connecting, low-selection module M3 3 Second input terminal of AND module M6
Output end O of connecting and negating module M4 4 First input terminal of AND module M7
Output O of connecting, high-selecting module M5 5 Second input terminal of AND module M7
Output O of connecting, AND module M6 6 Output terminal O of AND module M7 connected to set terminal S of memory generator module M8 7 Connected with the reset terminal R of the memory generator module M8, the output terminal O of the memory generator module M8 8 An output terminal O of a setting value module M9 connected with a switching terminal S of a switching module M11 9 And a first input terminal of the switching module M11
Output O of connection, setpoint module M10 10 And a second input terminal of the switching module M11
The output end of the water level transmitter PT1 of the water storage tank is connected with the first input end of the subtracter module M13
The output of the boiler load transmitter PT2 is connected to the input of the function generator module M12
Output O of the connection function generator module M12 12 And a second input terminal of the subtractor module M13
Connected, the output end O of the subtracter module M13 13 Input end of function generator module M14
Connected to the input of the function generator module M15
Output O of connection function generator module M14 14 And a first input of the adder module M17
Output terminal O of connection and switching module M11 11 And a second input of the adder module M17
Output O of the connection adder module M17 17 The output end O of the function generator module M15 is connected with the valve control unit of the water storage tank A 15 And a first input of the adder module M16
Output terminal O of connection and switching module M11 11 And a second input of the adder module M16
Output O of the connection adder module M16 16 Is connected with a valve control unit of the water storage tank B.
Furthermore, when the device is used, the actual water level value of the water storage tank is calculated mainly by collecting pressure of the water storage tank and differential pressure signals of a balance container, the corrected water level signals are sent to two prefabricated function devices, the low water level deviation program and the high water level deviation program correspond to each other respectively, and the function device of the valve A of the water storage tank outputs the common opening instruction of the water level control valve of the water storage tank.
For example, when the water level is lowered from the high level, if the lowering rate is greater than the preset value (-0.02), a negative bias is added to the water level signal, and when the water level is raised from the low level, if the raising rate is greater than the preset value (+ 0.02), the bias is reset.
In actual setting, the high-selection module M2 in the system is a high-selection module with a constant value of 8.5M, when the input value is greater than or equal to 8.5M, the output is 1, and when the input value is less than 8.5M, the output is 0;
the high-selection module M5 in the system is a high-selection module with a constant value of +0.02, when the input value is more than or equal to +0.02, the output is 1, and when the input value is less than +0.02, the output is 0;
the low selection module M3 in the system is a high selection module with a constant value of-0.02, when the input value is less than or equal to-0.02, the output is 1, and when the input value is greater than-0.02, the output is 0;
the A/B valve of the water storage tank is a continuous control valve and can be controlled from 0-100% of opening and closing, 0% represents that the valve is completely closed, 100% represents that the valve is completely opened, and 3% represents that the valve has 3% of opening;
the setting value module M9 in the system is a setting value module with a setting value of 3 percent;
the set value module M10 in the system is a set value module with a set value of 0 percent;
when the function generator module M12 is set, the functional relationship that is met is shown in the following table:
during the unit operation, different boiler load stages correspond different water storage tank water levels, and are a continuous function:
when the function generator module M14 (the valve of the water storage tank A) is arranged, the function relationship which is met is shown as the following table:
the valve of the water storage tank A is controlled from 0% to 100% according to the water level deviation value, and is a continuous function:
when the function generator module M15 (the valve of the water storage tank B) is arranged, the function relationship which is met is shown as the following table:
the valve of the water storage tank B is controlled from 0 percent to 100 percent according to the water level deviation value, and is a continuous function:
finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and these modifications or substitutions do not depart from the spirit of the corresponding technical solutions of the embodiments of the present invention.
Claims (1)
1. The utility model provides a supercritical boiler water storage tank water level automatic control system, includes water storage tank water level changer PT1 and boiler load changer PT2, its characterized in that: the automatic control system further comprises a differential module M1, a high-selection module M2, a low-selection module M3, an negation module M4, a high-selection module M5, a phase and module M6, a phase and module M7, a memory generator module M8, a set value module M9, a set value module M10, a switching module M11, a function generator module M12, a subtracter module M13, a function generator module M14, a function generator module M15, an adder module M16 and an adder module M17, and the automatic control system is structurally characterized in that:
the output end of the water storage tank water level transmitter PT1 is respectively connected with the input end of the differential module M1
Input end of high-selection module M2
A first input end of the subtracter module M13
Electrically connecting; the output end O of the differential module M1 1 Respectively with the input of the low selection module M3
Input end of high selection module M5
Electrically connected, the output O of the high selection module M2 2 Respectively connected with the input end of the negation module M4
First input terminal of AND module M6
Electrically connected, the output O of the negating module M4 4 First input terminal of AND module M6
Electrically connected, the output O of the low selection module M3 3 Second input terminal of AND module M6
Electrically connecting;
output end O of the negating module M4 4 And also with the first input of module M7
Electrically connected, the output O of the high selection module M5 5 Second input terminal of AND module M7
Electrically connecting;
output O of the AND module M6 6 The setting end S of the memory generator module M8 is electrically connected;
output O of the AND module M7 7 Is electrically connected with the reset terminal R of the memory generator module M8;
output O of the memory generator module M8 8 A switching end S electrically connected with the switching module M11, an output end O of the set value module M9 9 And a first input terminal of the switching module M11
Electrically connected to the output O of the setpoint module M10 10 And a second input terminal of the switching module M11
Electrically connecting;
the output end of the boiler load transmitter PT2 and the input end of the function generator module M12
Electrical connection, the output O of the function generator module M12 12 And a second input terminal of the subtractor module M13
Electrically connected to the output O of the subtractor module M13 13 Respectively connected with the input end of the function generator module M14
Input end of function generator module M15
Electrically connecting;
the output end O of the function generator module M14 14 And a first input of the adder module M17
Electrically connected, the output O of the adder module M17 17 Is electrically connected with the valve control unit of the water storage tank A;
output end O of function generator module M15 15 And a first input of the adder module M16
Electrically connected to the output O of the adder module M16 16 Is electrically connected with the valve control unit of the water storage tank B;
output end O of the switching module M11 11 Respectively connected to a second input of the adder module M17
A second input terminal of the adder module M16
And (6) electrically connecting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211178349.5A CN115264485B (en) | 2022-09-27 | 2022-09-27 | Water level automatic control system for water storage tank of supercritical boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211178349.5A CN115264485B (en) | 2022-09-27 | 2022-09-27 | Water level automatic control system for water storage tank of supercritical boiler |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115264485A true CN115264485A (en) | 2022-11-01 |
| CN115264485B CN115264485B (en) | 2023-01-13 |
Family
ID=83757126
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211178349.5A Active CN115264485B (en) | 2022-09-27 | 2022-09-27 | Water level automatic control system for water storage tank of supercritical boiler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115264485B (en) |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4242989A (en) * | 1979-05-14 | 1981-01-06 | General Electric Company | Boiler level control system |
| US4275447A (en) * | 1978-05-25 | 1981-06-23 | Framatome | Method of regulation of the water level in boilers or steam generators |
| JPH02192501A (en) * | 1989-01-19 | 1990-07-30 | Babcock Hitachi Kk | Water feed control device during fcb of drum boiler |
| JPH04148101A (en) * | 1990-10-12 | 1992-05-21 | Power Reactor & Nuclear Fuel Dev Corp | Controlling method for steam drum water level at time of switching of feed water control valve |
| JPH0989206A (en) * | 1995-09-20 | 1997-04-04 | Mitsubishi Heavy Ind Ltd | Recirculation control device for pump |
| JPH1163410A (en) * | 1997-08-25 | 1999-03-05 | Ishikawajima Harima Heavy Ind Co Ltd | Feedwater control unit of auxiliary boiler |
| JP2009186055A (en) * | 2008-02-04 | 2009-08-20 | Babcock Hitachi Kk | Switch control method and device of water level control and superheat degree control in once-through heat recovery boiler |
| CN103807847A (en) * | 2014-02-16 | 2014-05-21 | 国家电网公司 | Large-capacity boiler whole-course water feeing control system |
| CN205227285U (en) * | 2015-12-25 | 2016-05-11 | 华北电力科学研究院有限责任公司 | Whole control system of boiler drum level |
| CN112628721A (en) * | 2021-01-04 | 2021-04-09 | 国家能源集团国源电力有限公司 | Boiler wet-state operation water supply control method and device and storage medium |
| CN114992623A (en) * | 2022-04-29 | 2022-09-02 | 华能巢湖发电有限责任公司 | Water level control method and system for water storage tank of boiler circulating pump |
-
2022
- 2022-09-27 CN CN202211178349.5A patent/CN115264485B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4275447A (en) * | 1978-05-25 | 1981-06-23 | Framatome | Method of regulation of the water level in boilers or steam generators |
| US4242989A (en) * | 1979-05-14 | 1981-01-06 | General Electric Company | Boiler level control system |
| JPH02192501A (en) * | 1989-01-19 | 1990-07-30 | Babcock Hitachi Kk | Water feed control device during fcb of drum boiler |
| JPH04148101A (en) * | 1990-10-12 | 1992-05-21 | Power Reactor & Nuclear Fuel Dev Corp | Controlling method for steam drum water level at time of switching of feed water control valve |
| JPH0989206A (en) * | 1995-09-20 | 1997-04-04 | Mitsubishi Heavy Ind Ltd | Recirculation control device for pump |
| JPH1163410A (en) * | 1997-08-25 | 1999-03-05 | Ishikawajima Harima Heavy Ind Co Ltd | Feedwater control unit of auxiliary boiler |
| JP2009186055A (en) * | 2008-02-04 | 2009-08-20 | Babcock Hitachi Kk | Switch control method and device of water level control and superheat degree control in once-through heat recovery boiler |
| CN103807847A (en) * | 2014-02-16 | 2014-05-21 | 国家电网公司 | Large-capacity boiler whole-course water feeing control system |
| CN205227285U (en) * | 2015-12-25 | 2016-05-11 | 华北电力科学研究院有限责任公司 | Whole control system of boiler drum level |
| CN112628721A (en) * | 2021-01-04 | 2021-04-09 | 国家能源集团国源电力有限公司 | Boiler wet-state operation water supply control method and device and storage medium |
| CN114992623A (en) * | 2022-04-29 | 2022-09-02 | 华能巢湖发电有限责任公司 | Water level control method and system for water storage tank of boiler circulating pump |
Non-Patent Citations (2)
| Title |
|---|
| 卢斗等: "超临界直流锅炉汽水分离器储水罐水位的控制", 《发电设备》 * |
| 王会会: "渭河三期汽包水位自动控制系统的投入", 《陕西电力》 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115264485B (en) | 2023-01-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107420874B (en) | Ultra-supercritical thermal generator set coordination control system | |
| CN110360540B (en) | Boiler main steam temperature control method for power grid AGC load instruction frequent fluctuation | |
| CN110260356B (en) | Energy-saving control method of fluidized bed boiler | |
| CN101338892A (en) | Thermal power unit reheated steam temperature control method | |
| CN204302776U (en) | A kind of fired power generating unit overheating steam temperature Dynamic matrix control optimization device | |
| CN105135409B (en) | Supercritical unit boiler master controller control method based on primary frequency modulation action amplitude | |
| CN112648029B (en) | Coordinated control optimization method for deep peak regulation working condition of thermal power plant | |
| CN110879620A (en) | Liquid level control method and system for vertical steam generator of nuclear power station | |
| CN109378833B (en) | Method for realizing rapid frequency modulation of unit by controlling steam extraction amount of steam turbine | |
| CN112039091B (en) | Primary frequency modulation control method based on zero number high-order addition | |
| CN108361683B (en) | Full load section reheat temperature intelligent control system | |
| CN113669717A (en) | Method, device and storage medium for automatically controlling water supply | |
| CN115264485B (en) | Water level automatic control system for water storage tank of supercritical boiler | |
| KR101093032B1 (en) | Controlling method for fast and linear load control by using compensating models and optimization for turbine and boiler response delays in power plants | |
| CN110631002A (en) | Control method for main air temperature of thermal power generating unit | |
| CN113791587B (en) | Coordination control method, system, storage medium and device of fluidized bed generator set | |
| CN215006401U (en) | Main steam temperature control device of thermal power generating unit | |
| CN113359428B (en) | Supercritical unit fuel calorific value correction control method based on dynamic work coal ratio | |
| CN110296387B (en) | Automatic optimization control method for liquid level of heater | |
| CN109441559B (en) | Balance tracking control method of flexible coordination control system | |
| CN111878796A (en) | Supercritical once-through boiler unit intermediate point temperature four-quadrant control method and control loop thereof | |
| CN104791757A (en) | Coal-fired chain-grate boiler control system and control method thereof | |
| CN111472852B (en) | Intermediate point enthalpy value frequency modulation based logical optimization method for generator set | |
| CN114776397B (en) | Automatic control method for main steam pressure of small steam turbine generator unit | |
| KR102432715B1 (en) | Pure Variable Pressure Operating System for Substitution of 500MW Generator Operating Reserve |
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 | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |