CN110986021A - Boiler overpressure protection system and control method thereof - Google Patents
Boiler overpressure protection system and control method thereof Download PDFInfo
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- CN110986021A CN110986021A CN201911367564.8A CN201911367564A CN110986021A CN 110986021 A CN110986021 A CN 110986021A CN 201911367564 A CN201911367564 A CN 201911367564A CN 110986021 A CN110986021 A CN 110986021A
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- temperature
- boiler
- overpressure
- protection valve
- overpressure protection
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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
- F22B37/44—Applications, arrangements, or dispositions of alarm or automatic safety devices of safety valves
- F22B37/446—Safety devices responsive to overpressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B35/00—Control systems for steam boilers
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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
- F22B37/47—Applications, arrangements, or dispositions of alarm or automatic safety devices responsive to abnormal temperature, e.g. actuated by fusible plugs
Abstract
The invention discloses a boiler overpressure protection system, which comprises a boiler temperature detection module, a pressure sensor and a pressure sensor, wherein the boiler temperature detection module is used for detecting the real-time boiler temperature; the boiler pressure detection module is used for detecting the real-time boiler pressure; the historical data integration module is used for integrating the boiler temperature and the boiler pressure data; the low-temperature overpressure protection valve and the high-temperature overpressure protection valve are used for carrying out pressure relief protection on the boiler; and the control module is used for controlling the low-temperature overpressure protection valve and the high-temperature overpressure protection valve. The invention can improve the defects of the prior art and reduce the interference of the pressure relief process of the boiler on the pressure of the boiler.
Description
Technical Field
The invention relates to the technical field of operation of thermal power plants, in particular to a boiler overpressure protection system and a control method thereof.
Background
The steam boiler has the characteristics of large working pressure and high working temperature. When the pressure in the boiler exceeds the maximum allowable pressure during the operation of the boiler, it is called boiler overpressure. Boiler overpressure is a very dangerous abnormal condition, which easily causes boiler explosion. The existing boiler overpressure protection system easily causes the too large pressure fluctuation amplitude of the boiler in the pressure relief process of the boiler.
Disclosure of Invention
The invention aims to provide a boiler overpressure protection system and a control method thereof, which can solve the defects of the prior art and reduce the interference of the boiler pressure relief process on the boiler pressure.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows.
A boiler overpressure protection system, comprising,
the boiler temperature detection module is used for detecting the real-time boiler temperature;
the boiler pressure detection module is used for detecting the real-time boiler pressure;
the historical data integration module is used for integrating the boiler temperature and the boiler pressure data;
the low-temperature overpressure protection valve and the high-temperature overpressure protection valve are used for carrying out pressure relief protection on the boiler;
and the control module is used for controlling the low-temperature overpressure protection valve and the high-temperature overpressure protection valve.
A control method of the boiler overpressure protection system comprises the following steps:
A. the boiler temperature detection module and the boiler pressure detection module respectively acquire boiler temperature data and boiler pressure data and then send the boiler temperature data and the boiler pressure data to the historical data integration module for historical data integration;
B. the control module judges the state of the boiler according to the data integration result, if the boiler is in a low-temperature overpressure state, the low-temperature overpressure protection valve is started to perform pressure relief protection on the boiler, if the boiler is in an unstable high-temperature overpressure state, the low-temperature overpressure protection valve and the high-temperature overpressure protection valve are started simultaneously to perform pressure relief protection on the boiler, and if the boiler is in a stable high-temperature overpressure state, the high-temperature overpressure protection valve is started to perform pressure relief protection on the boiler.
Preferably, in the step a, the integrating the history data includes the steps of,
a1, drawing a data curve by the temperature data and the pressure data;
a2, marking a low-temperature interval and a high-temperature interval on a temperature data curve, and marking an overpressure interval on a pressure data curve;
a3, marking the marked low-temperature interval and the marked overlapping time region of the high-temperature interval and the overpressure interval as a low-temperature overpressure region and a high-temperature overpressure region;
a4, setting a minimum time interval and a minimum interval, if a low-temperature overpressure area and a high-temperature overpressure area exist in the minimum time interval at the same time, defining the minimum time interval as a target interval, and merging all continuous target intervals of which the interval between adjacent target intervals is smaller than the minimum interval into an unstable high-temperature overpressure interval.
Preferably, in step B, when the boiler is in a low-temperature overpressure state, the control method of the low-temperature overpressure protection valve is as follows,
b11, the opening ratio of the low-temperature overpressure protection valve is in direct proportion to the boiler pressure.
Preferably, in step B, when the boiler is in an unstable high temperature and overpressure condition, the control method of the low temperature and overpressure protection valve and the high temperature and overpressure protection valve is as follows,
b21, simultaneously opening a low-temperature overpressure protection valve and a high-temperature overpressure protection valve, wherein the total pressure relief flow of the low-temperature overpressure protection valve and the high-temperature overpressure protection valve is lower than the upper limit value of the boiler pressure relief;
b22, determining the opening of the high-temperature overpressure protection valve according to the average pressure of the unstable high-temperature overpressure state, and performing closed-loop control on the opening of the low-temperature overpressure protection valve by using an advanced correction link according to the real-time pressure of the unstable high-temperature overpressure state.
Preferably, in the step B, when the boiler is in a stable high-temperature overpressure state, the control method of the high-temperature overpressure protection valve comprises the following steps,
b31, opening the high-temperature overpressure protection valve to the maximum opening;
b32, after the temperature or the pressure in the high-temperature overpressure state begins to drop, reducing the opening of the high-temperature overpressure protection valve, then observing whether the pressure of the boiler rises, if the pressure of the boiler rises, increasing the opening of the high-temperature overpressure protection valve, and if the pressure of the boiler drops or keeps unchanged, continuously reducing the opening of the high-temperature overpressure protection valve until the boiler exits the high-temperature overpressure state; the adjustment amount of the opening of the high-temperature overpressure protection valve is less than 10% each time.
Adopt the beneficial effect that above-mentioned technical scheme brought to lie in: according to the invention, the low-temperature overpressure protection valve and the high-temperature overpressure protection valve are arranged, and the special optimized control strategy is utilized to realize accurate pressure relief control on different states of the boiler, so that the pressure fluctuation of the boiler is effectively reduced.
Drawings
FIG. 1 is a schematic diagram of one embodiment of the present invention.
In the figure: 1. a boiler temperature detection module; 2. a boiler pressure detection module; 3. a historical data integration module; 4. a low temperature overpressure protection valve; 5. a high temperature overpressure protection valve; 6. and a control module.
Detailed Description
Referring to fig. 1, the present embodiment includes,
the boiler temperature detection module 1 is used for detecting the real-time boiler temperature;
the boiler pressure detection module 2 is used for detecting the real-time boiler pressure;
the historical data integration module 3 is used for integrating the boiler temperature and the boiler pressure data;
the low-temperature overpressure protection valve 4 and the high-temperature overpressure protection valve 5 are used for carrying out pressure relief protection on the boiler;
and the control module 6 is used for controlling the low-temperature overpressure protection valve 4 and the high-temperature overpressure protection valve 5.
A control method of the boiler overpressure protection system comprises the following steps:
A. the boiler temperature detection module 1 and the boiler pressure detection module 2 respectively acquire boiler temperature data and boiler pressure data and then send the boiler temperature data and the boiler pressure data to the historical data integration module 3 for historical data integration;
B. the control module 6 judges the state of the boiler according to the data integration result, if the boiler is in a low-temperature overpressure state, the low-temperature overpressure protection valve 4 is started to perform pressure relief protection on the boiler, if the boiler is in an unstable high-temperature overpressure state, the low-temperature overpressure protection valve 4 and the high-temperature overpressure protection valve 5 are started simultaneously to perform pressure relief protection on the boiler, and if the boiler is in a stable high-temperature overpressure state, the high-temperature overpressure protection valve 5 is started to perform pressure relief protection on the boiler.
In the step A, the step of integrating the historical data comprises the following steps,
a1, drawing a data curve by the temperature data and the pressure data;
a2, marking a low-temperature interval and a high-temperature interval on a temperature data curve, and marking an overpressure interval on a pressure data curve;
a3, marking the marked low-temperature interval and the marked overlapping time region of the high-temperature interval and the overpressure interval as a low-temperature overpressure region and a high-temperature overpressure region;
a4, setting a minimum time interval and a minimum interval, if a low-temperature overpressure area and a high-temperature overpressure area exist in the minimum time interval at the same time, defining the minimum time interval as a target interval, and merging all continuous target intervals of which the interval between adjacent target intervals is smaller than the minimum interval into an unstable high-temperature overpressure interval.
In the step B, when the boiler is in a low-temperature overpressure state, the control method of the low-temperature overpressure protection valve 4 is as follows,
b11, the opening ratio of the low temperature overpressure protection valve 4 is proportional to the boiler pressure.
In the step B, when the boiler is in an unstable high-temperature overpressure state, the control method of the low-temperature overpressure protection valve 4 and the high-temperature overpressure protection valve 5 is that,
b21, simultaneously opening the low-temperature overpressure protection valve 4 and the high-temperature overpressure protection valve 5, wherein the total pressure relief flow of the low-temperature overpressure protection valve 4 and the high-temperature overpressure protection valve 5 is lower than the upper limit of the pressure relief of the boiler;
b22, determining the opening of the high-temperature overpressure protection valve 5 according to the average pressure of the unstable high-temperature overpressure state, and performing closed-loop control on the opening of the low-temperature overpressure protection valve 4 by using an advanced correction link according to the real-time pressure of the unstable high-temperature overpressure state.
In the step B, when the boiler is in a stable high-temperature overpressure state, the control method of the high-temperature overpressure protection valve 5 is as follows,
b31, opening the high-temperature overpressure protection valve 5 to the maximum opening;
b32, after the temperature or the pressure in the high-temperature overpressure state begins to drop, reducing the opening degree of the high-temperature overpressure protection valve 5, then observing whether the pressure of the boiler rises, if the pressure of the boiler rises, increasing the opening degree of the high-temperature overpressure protection valve 5, and if the pressure of the boiler drops or keeps unchanged, continuously reducing the opening degree of the high-temperature overpressure protection valve 5 until the boiler exits from the high-temperature overpressure state; the regulating quantity of the opening degree of the high-temperature overpressure protection valve 5 is less than 10% each time.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (6)
1. A boiler overpressure protection system characterized by: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
the boiler temperature detection module (1) is used for detecting the real-time boiler temperature;
the boiler pressure detection module (2) is used for detecting the real-time boiler pressure;
the historical data integration module (3) is used for integrating the boiler temperature and the boiler pressure data;
the low-temperature overpressure protection valve (4) and the high-temperature overpressure protection valve (5) are used for carrying out pressure relief protection on the boiler;
and the control module (6) is used for controlling the low-temperature overpressure protection valve (4) and the high-temperature overpressure protection valve (5).
2. A method of controlling a boiler overpressure protection system of claim 1, characterized by the steps of:
A. the boiler temperature detection module (1) and the boiler pressure detection module (2) respectively acquire boiler temperature data and boiler pressure data and then send the boiler temperature data and the boiler pressure data to the historical data integration module (3) for historical data integration;
B. the control module (6) judges the state of the boiler according to the data integration result, if the boiler is in a low-temperature overpressure state, the low-temperature overpressure protection valve (4) is started to perform pressure relief protection on the boiler, if the boiler is in an unstable high-temperature overpressure state, the low-temperature overpressure protection valve (4) and the high-temperature overpressure protection valve (5) are started simultaneously to perform pressure relief protection on the boiler, and if the boiler is in a stable high-temperature overpressure state, the high-temperature overpressure protection valve (5) is started to perform pressure relief protection on the boiler.
3. The control method of a boiler overpressure protection system, according to claim 2, characterized by: in the step A, the step of integrating the historical data comprises the following steps,
a1, drawing a data curve by the temperature data and the pressure data;
a2, marking a low-temperature interval and a high-temperature interval on a temperature data curve, and marking an overpressure interval on a pressure data curve;
a3, marking the marked low-temperature interval and the marked overlapping time region of the high-temperature interval and the overpressure interval as a low-temperature overpressure region and a high-temperature overpressure region;
a4, setting a minimum time interval and a minimum interval, if a low-temperature overpressure area and a high-temperature overpressure area exist in the minimum time interval at the same time, defining the minimum time interval as a target interval, and merging all continuous target intervals of which the interval between adjacent target intervals is smaller than the minimum interval into an unstable high-temperature overpressure interval.
4. The control method of a boiler overpressure protection system of claim 3, wherein: in the step B, when the boiler is in a low-temperature overpressure state, the control method of the low-temperature overpressure protection valve (4) is as follows,
b11, the opening ratio of the low-temperature overpressure protection valve (4) is in direct proportion to the boiler pressure.
5. The control method of a boiler overpressure protection system of claim 3, wherein: in the step B, when the boiler is in an unstable high-temperature overpressure state, the control method of the low-temperature overpressure protection valve (4) and the high-temperature overpressure protection valve (5) is as follows,
b21, simultaneously opening the low-temperature overpressure protection valve (4) and the high-temperature overpressure protection valve (5), wherein the total pressure relief flow of the low-temperature overpressure protection valve (4) and the high-temperature overpressure protection valve (5) is lower than the upper limit value of the boiler pressure relief;
b22, determining the opening degree of the high-temperature overpressure protection valve (5) according to the average pressure of the unstable high-temperature overpressure state, and performing closed-loop control on the opening degree of the low-temperature overpressure protection valve (4) by using an advance correction link according to the real-time pressure of the unstable high-temperature overpressure state.
6. The control method of a boiler overpressure protection system of claim 3, wherein: in the step B, when the boiler is in a stable high-temperature overpressure state, the control method of the high-temperature overpressure protection valve (5) is as follows,
b31, opening the high-temperature overpressure protection valve (5) to the maximum opening;
b32, after the temperature or the pressure in the high-temperature overpressure state begins to drop, reducing the opening degree of the high-temperature overpressure protection valve (5), then observing whether the pressure of the boiler rises, if the pressure of the boiler rises, increasing the opening degree of the high-temperature overpressure protection valve (5), and if the pressure of the boiler falls or keeps unchanged, continuously reducing the opening degree of the high-temperature overpressure protection valve (5) until the boiler exits from the high-temperature overpressure state; the regulating quantity of the opening degree of the high-temperature overpressure protection valve (5) is less than 10% each time.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112343553A (en) * | 2020-10-28 | 2021-02-09 | 中海石油(中国)有限公司 | Offshore thick oil steam injection overpressure protection system |
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| CN2083689U (en) * | 1990-11-19 | 1991-08-28 | 李福祚 | Boiler series all-automatic protecting alarm controlled device |
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| CN106195989A (en) * | 2016-08-25 | 2016-12-07 | 梧州市自动化技术研究开发院 | A kind of boiler controlling method |
| CN207148626U (en) * | 2017-08-29 | 2018-03-27 | 杭州法恩电气自动化有限公司 | A kind of miniature boiler specific PLC control system |
| CN208186310U (en) * | 2018-05-04 | 2018-12-04 | 广州贝龙环保热力设备股份有限公司 | Gas fired-boiler equipped with overpressure protection apparatus |
| CN209706849U (en) * | 2019-09-27 | 2019-11-29 | 大唐东营发电有限公司 | Boiler combustion site intelligent monitoring for protection system |
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2019
- 2019-12-26 CN CN201911367564.8A patent/CN110986021B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2083689U (en) * | 1990-11-19 | 1991-08-28 | 李福祚 | Boiler series all-automatic protecting alarm controlled device |
| CN103017134A (en) * | 2012-12-25 | 2013-04-03 | 潘慧敏 | Intelligent boiler control system |
| CN106195989A (en) * | 2016-08-25 | 2016-12-07 | 梧州市自动化技术研究开发院 | A kind of boiler controlling method |
| CN207148626U (en) * | 2017-08-29 | 2018-03-27 | 杭州法恩电气自动化有限公司 | A kind of miniature boiler specific PLC control system |
| CN208186310U (en) * | 2018-05-04 | 2018-12-04 | 广州贝龙环保热力设备股份有限公司 | Gas fired-boiler equipped with overpressure protection apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112343553A (en) * | 2020-10-28 | 2021-02-09 | 中海石油(中国)有限公司 | Offshore thick oil steam injection overpressure protection system |
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