CN114046534A - Boiler combustion pressure pulsation control system with triple redundancy function - Google Patents
Boiler combustion pressure pulsation control system with triple redundancy function Download PDFInfo
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- CN114046534A CN114046534A CN202111335554.3A CN202111335554A CN114046534A CN 114046534 A CN114046534 A CN 114046534A CN 202111335554 A CN202111335554 A CN 202111335554A CN 114046534 A CN114046534 A CN 114046534A
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- optical fiber
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- pressure pulsation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
- F23N5/02—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium
- F23N5/08—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using light-sensitive elements
- F23N5/082—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using light-sensitive elements using electronic means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2225/00—Measuring
- F23N2225/04—Measuring pressure
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
The invention discloses a boiler combustion pressure pulsation control system with triple redundancy functions, which comprises an optical fiber pressure pulsation sensor, a boiler, a light source and light signal conditioning module, an optical fiber bundle, a data acquisition analyzer, a combustion pressure pulsation monitoring and processing center and a feedback control unit, wherein the optical fiber pressure pulsation sensor is connected with the boiler; the inlet of the optical fiber pressure pulsation sensor is communicated with a pressure measuring port of a boiler, the output end of the optical fiber pressure pulsation sensor is connected with the input end of the optical signal conditioning module through an optical fiber bundle and a light source, the output end of the light source and the output end of the optical signal conditioning module are connected with the input end of a data acquisition analyzer, the output end of the data acquisition analyzer is connected with the input end of a combustion pressure pulsation monitoring and processing center, the output end of the combustion pressure pulsation monitoring and processing center is connected with the control end of a fuel quantity control valve and an air quantity regulating valve of the boiler through a feedback control unit, and the system can effectively avoid accidents of accidental shutdown caused by error triggering of alarm information when the sensor breaks down.
Description
Technical Field
The invention relates to a boiler combustion pressure pulsation control system, in particular to a boiler combustion pressure pulsation control system with triple redundancy functions.
Background
The combustion system of the power station boiler is an important link of thermal power production, the combustion state of fuel in the boiler is easily influenced by a plurality of operation and control conditions such as coal quality characteristics, load working condition change, air distribution adjustment and the like, when the combustion is unstable, thermoacoustic coupling oscillation occurs in a hearth, larger combustion pressure pulsation is generated, and the safe and stable operation of the boiler is influenced when the combustion is serious. The energy policy of China requires that the power station boiler burns inferior or low-grade coal as much as possible, so that the possibility and the harmfulness of the boiler combustion system are further increased.
In order to ensure the safe and stable operation of the boiler and reduce the occurrence of faults of a boiler combustion system, state parameters of combustion equipment are monitored and analyzed by using an advanced combustion monitoring and diagnosing technical means, whether the combustion system is in the optimal combustion state or not is judged, and a corresponding countermeasure scheme is provided for operating personnel, so that the aims of reducing the accident shutdown loss, improving the combustion efficiency and reducing the pollutant emission are fulfilled.
In view of the importance of the combustion stability state to the safe and stable operation of the boiler, the combustion monitoring and diagnosing technology with triple redundancy functions is adopted to monitor and diagnose the combustion state in the boiler hearth in real time, and the improvement of the operation safety and reliability of the boiler is facilitated.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a boiler combustion pressure pulsation control system with triple redundancy functions, which can improve the operation safety of a boiler and reduce the failure probability of a boiler combustion system.
In order to achieve the purpose, the boiler combustion pressure pulsation control system with triple redundancy function comprises an optical fiber pressure pulsation sensor, a boiler, a light source and light signal conditioning module, an optical fiber bundle, a data acquisition analyzer, a combustion pressure pulsation monitoring processing center and a feedback control unit;
the inlet of the optical fiber pressure pulsation sensor is communicated with the pressure measuring port of the boiler, the output end of the optical fiber pressure pulsation sensor is connected with the input end of the optical signal conditioning module through an optical fiber bundle and a light source, the output end of the light source and the output end of the optical signal conditioning module are connected with the input end of a data acquisition analyzer, the output end of the data acquisition analyzer is connected with the input end of a combustion pressure pulsation monitoring and processing center, and the output end of the combustion pressure pulsation monitoring and processing center is connected with the control end of a fuel quantity control valve and an air quantity regulating valve of the boiler through a feedback control unit.
The optical fiber pressure pulsation sensor comprises a first optical fiber probe, a second optical fiber probe, a third optical fiber probe, a sensor upper cover, an upper heat-insulating layer, a sensor lower cover, a lower heat-insulating layer and a transmission film;
an upper heat insulation layer is arranged between the bottom of the upper sensor cover and the top of the lower sensor cover, a lower heat insulation layer is arranged at the bottom of the lower sensor cover, a pressure measurement cavity is arranged at the bottom of the lower sensor cover, a first metal sensing diaphragm, a second metal sensing diaphragm and a third metal sensing diaphragm are arranged in the pressure measurement cavity, a first vacuum heat insulation cavity is formed between the first metal sensing diaphragm and one side wall of the pressure measurement cavity, a second vacuum heat insulation cavity is formed between the second metal sensing diaphragm and the top of the pressure measurement cavity, a third vacuum heat insulation cavity is formed between the third metal sensing diaphragm and the other side wall of the pressure measurement cavity, a first optical fiber probe penetrates through the upper sensor cover and the upper heat insulation layer and then penetrates through the side wall of the lower sensor cover to be inserted into the first vacuum heat insulation cavity and face the first metal sensing diaphragm, and a second optical fiber probe penetrates through the upper sensor cover and then is inserted into the second vacuum heat insulation cavity, the third optical fiber probe penetrates through the upper cover of the sensor and the upper heat insulation layer, penetrates through the side wall of the lower cover of the sensor, is inserted into the third vacuum heat insulation cavity and is opposite to the third metal sensing diaphragm;
the first optical fiber probe, the second optical fiber probe and the third optical fiber probe are connected with the optical signal conditioning module through an optical fiber bundle and a light source, a penetrating film is arranged at the bottom opening of the pressure measuring cavity, a plurality of air holes are formed in the penetrating film, and the pressure measuring cavity is communicated with a pressure measuring port of the boiler through the air holes.
The device also comprises a mounting nut; the mounting nut is sleeved on the peripheries of the upper sensor cover, the upper heat insulation layer and the lower sensor cover.
The axes of the upper sensor cover, the upper heat insulation layer, the lower sensor cover and the lower heat insulation layer are overlapped.
The sensor upper cover, the upper heat insulation layer, the sensor lower cover and the lower heat insulation layer are connected through diffusion welding.
The outer diameter of the upper cover of the sensor is 12mm, the length of the upper cover of the sensor is 15mm, the outer diameter of the upper heat insulation layer is 12mm, the thickness of the upper heat insulation layer is 2mm, the side length of the central square hole in the upper heat insulation layer is 2mm, the outer diameter of the upper heat insulation layer is 12mm, the length of the pressure measuring cavity is 6mm, the width of the pressure measuring cavity is 2mm, the height of the pressure measuring cavity is 2mm, the outer diameter of the lower heat insulation layer is 12mm, the thickness of the lower heat insulation layer is 5mm, and the side length of the central square hole in the lower heat insulation layer is 2 mm; the diameters of the first optical fiber probe, the second optical fiber probe and the third optical fiber probe are all 1 mm; the side lengths of the first metal sensing membrane, the second metal sensing membrane and the third metal sensing membrane are all 3mm, and the thickness of the first metal sensing membrane is 1 mm; the pore diameter of the air guide hole is 0.5 mm.
The invention has the following beneficial effects:
when the boiler combustion pressure pulsation control system with the triple redundancy function is specifically operated, based on the optical fiber pressure pulsation sensor with the triple redundancy function, 3 metal sensing diaphragms and 3 paths of optical fiber probes are arranged at the head of the sensor, a measured working medium enters a pressure measuring cavity and then simultaneously acts on the 3 metal sensing diaphragms, the 3 paths of optical fiber probes simultaneously measure the deformation of the metal sensing diaphragms, the pressure of the measured working medium is obtained in real time, 3 paths of pressure measurement signals can be obtained simultaneously only through one pressure measuring mounting hole, the 3 paths of pressure pulsation signals can be mutually verified, the reliability and the accuracy of boiler combustion state monitoring diagnosis are improved, the operation safety of a boiler is further improved, and the probability of the boiler combustion system failing is reduced.
Drawings
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is a schematic structural diagram of the optical fiber pressure pulsation sensor according to the present invention.
The system comprises an optical fiber pressure pulsation sensor 1, a light source and optical signal conditioning module 2, a data acquisition analyzer 3, a combustion pressure pulsation monitoring and processing center 4, a feedback control unit 5, an optical fiber bundle 6, a boiler 7, a first optical fiber probe 8, a second optical fiber probe 9, a third optical fiber probe 10, a sensor upper cover 11, an upper heat-insulating layer 12, a sensor lower cover 13, a lower heat-insulating layer 14, a third vacuum heat-insulating cavity 15, a third metal sensing diaphragm 16, a first vacuum heat-insulating cavity 17, a pressure measuring cavity 18, a transmission film 19, a first metal sensing diaphragm 20, a second metal sensing diaphragm 21, a second vacuum heat-insulating cavity 22 and a mounting nut 23.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments, and are not intended to limit the scope of the present disclosure. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present disclosure. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
There is shown in the drawings a schematic block diagram of a disclosed embodiment in accordance with the invention. The figures are not drawn to scale, wherein certain details are exaggerated and possibly omitted for clarity of presentation. The shapes of various regions, layers and their relative sizes and positional relationships shown in the drawings are merely exemplary, and deviations may occur in practice due to manufacturing tolerances or technical limitations, and a person skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions, according to actual needs.
Referring to fig. 1, the boiler combustion pressure pulsation control system with triple redundancy function according to the present invention includes an optical fiber pressure pulsation sensor 1, a boiler 7, a light source and optical signal conditioning module 2, an optical fiber bundle 6, a data acquisition analyzer 3, a combustion pressure pulsation monitoring processing center 4, and a feedback control unit 5;
the inlet of the optical fiber pressure pulsation sensor 1 is communicated with the pressure measuring port of the boiler 7, the output end of the optical fiber pressure pulsation sensor 1 is connected with the input end of the optical signal conditioning module 2 through the optical fiber bundle 6 and the light source, the output ends of the light source and the optical signal conditioning module 2 are connected with the input end of the data acquisition analyzer 3, the output end of the data acquisition analyzer 3 is connected with the input end of the combustion pressure pulsation monitoring and processing center 4, and the output end of the combustion pressure pulsation monitoring and processing center 4 is connected with the control end of the fuel quantity control valve and the air quantity regulating valve of the boiler 7 through the feedback control unit 5.
Referring to fig. 2, the optical fiber pressure pulsation sensor 1 includes a first optical fiber probe 8, a second optical fiber probe 9, a third optical fiber probe 10, a sensor upper cover 11, an upper heat insulation layer 12, a sensor lower cover 13, a lower heat insulation layer 14, a permeable membrane 19 and a mounting nut 23;
an upper heat insulation layer 12 is arranged between the bottom of the upper sensor cover 11 and the top of the lower sensor cover 13, a lower heat insulation layer 14 is arranged at the bottom of the lower sensor cover 13, a pressure measurement cavity 18 is arranged at the bottom of the lower sensor cover 13, wherein a first metal sensing diaphragm 20, a second metal sensing diaphragm 21 and a third metal sensing diaphragm 16 are arranged in the pressure measurement cavity 18, a first vacuum heat insulation cavity 17 is formed between the first metal sensing diaphragm 20 and one side wall of the pressure measurement cavity 18, a second vacuum heat insulation cavity 22 is formed between the second metal sensing diaphragm 21 and the top of the pressure measurement cavity 18, a third vacuum heat insulation cavity 15 is formed between the third metal sensing diaphragm 16 and the other side wall of the pressure measurement cavity 18, a first optical fiber probe 8 penetrates through the upper sensor cover 11 and the upper heat insulation layer 12, penetrates through the side wall of the lower sensor cover 13, is inserted into the first vacuum heat insulation cavity 17 and faces the first metal sensing diaphragm 20, the second optical fiber probe 9 passes through the sensor upper cover 11 and then is inserted into the second vacuum heat insulation cavity 22 and faces the second metal sensing diaphragm 21, and the third optical fiber probe 10 passes through the sensor upper cover 11 and the upper heat insulation layer 12 and then passes through the side wall of the sensor lower cover 13 and then is inserted into the third vacuum heat insulation cavity 15 and faces the third metal sensing diaphragm 16.
The first optical fiber probe 8, the second optical fiber probe 9 and the third optical fiber probe 10 are connected with the optical signal conditioning module 2 through an optical fiber bundle 6 and a light source, a permeable membrane 19 is arranged at the bottom opening of the pressure measurement cavity 18, wherein a plurality of air holes are arranged on the permeable membrane 19, and the pressure measurement cavity 18 is communicated with a pressure measurement port of the boiler 7 through the air holes.
The outer diameter of the upper cover 11 of the sensor is 12mm, the length of the upper cover is 15mm, the outer diameter of the upper heat-insulating layer 12 is 12mm, the thickness of the upper heat-insulating layer 12 is 2mm, the side length of a central square hole in the upper heat-insulating layer 12 is 2mm, the outer diameter of the upper heat-insulating layer 12 is 12mm, the length of the pressure measuring cavity 18 is 6mm, the width of the pressure measuring cavity is 2mm, the height of the pressure measuring cavity is 2mm, the outer diameter of the lower heat-insulating layer 14 is 12mm, the thickness of the lower heat-insulating layer is 5mm, and the side length of the central square hole in the lower heat-insulating layer 14 is 2 mm; the diameters of the first optical fiber probe 8, the second optical fiber probe 9 and the third optical fiber probe 10 are all 1 mm; the side lengths of the first metal sensing diaphragm 20, the second metal sensing diaphragm 21 and the third metal sensing diaphragm 16 are all 3mm, and the thickness is 1 mm; the pore diameter of the air guide hole is 0.5 mm.
The axes of the sensor upper cover 11, the upper heat insulation layer 12, the sensor lower cover 13 and the lower heat insulation layer 14 are overlapped, and the sensor upper cover 11, the upper heat insulation layer 12, the sensor lower cover 13 and the lower heat insulation layer 14 are connected through diffusion welding. The mounting nut 23 is sleeved on the peripheries of the sensor upper cover 11, the upper heat insulation layer 12 and the sensor lower cover 13.
The working process of the invention is as follows:
high-temperature flue gas in the boiler 7 enters a pressure measuring cavity 18 through a gas guiding hole, a first metal sensing diaphragm 20, a second metal sensing diaphragm 21 and a third metal sensing diaphragm 16 deform under the action of high-temperature flue gas pressure, a light source and optical signal conditioning module 2 emits measuring light beams, the measuring light beams are transmitted to the first metal sensing diaphragm 20, the second metal sensing diaphragm 21 and the third metal sensing diaphragm 16 through a first optical fiber probe 8, a second optical fiber probe 9 and a third optical fiber probe 10 respectively, the measuring light beams are reflected by the first metal sensing diaphragm 20, the second metal sensing diaphragm 21 and the third metal sensing diaphragm 16 and then return to the light source and optical signal conditioning module 2 through the first optical fiber probe 8, the second optical fiber probe 9 and the third optical fiber probe 10 respectively, and the light source and optical signal conditioning module 2 converts reflected light in three directions into voltage signals;
the data acquisition analyzer 3 acquires voltage signals output by the light source and the optical signal conditioning module 2 in real time according to the sampling frequency set by the combustion pressure pulsation monitoring processing center 4 and outputs the voltage signals to the combustion pressure pulsation monitoring processing center 4;
the combustion pressure pulsation monitoring processing center 4 converts the voltage signal into a real-time pressure, the combustion pressure pulsation monitoring processing center 4 generates a fuel and air amount adjustment command of the boiler 7 according to the real-time pressure, then sends the fuel and air amount adjustment command of the boiler 7 to the feedback control unit 5, and the feedback control unit 5 controls a fuel amount control valve and an air amount adjustment valve of the boiler 7 according to the fuel and air amount adjustment command of the boiler 7 so as to adjust the amount of fuel and the amount of air flowing into the boiler 7 in real time, so that the real-time pressure is within a preset range, the combustion stability of the boiler 7 is ensured, and the combustion pressure pulsation is always controlled in a safe and stable area.
Although the invention has been described in detail hereinabove with respect to a general description and specific embodiments thereof, it will be apparent to those skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (6)
1. A boiler combustion pressure pulsation control system with triple redundancy function is characterized by comprising an optical fiber pressure pulsation sensor (1), a boiler (7), a light source and light signal conditioning module (2), an optical fiber bundle (6), a data acquisition analyzer (3), a combustion pressure pulsation monitoring and processing center (4) and a feedback control unit (5);
the inlet of the optical fiber pressure pulsation sensor (1) is communicated with the pressure measuring port of the boiler (7), the output end of the optical fiber pressure pulsation sensor (1) is connected with the input end of the optical signal conditioning module (2) through an optical fiber bundle (6) and a light source, the output end of the light source and the output end of the optical signal conditioning module (2) are connected with the input end of the data acquisition analyzer (3), the output end of the data acquisition analyzer (3) is connected with the input end of the combustion pressure pulsation monitoring and processing center (4), and the output end of the combustion pressure pulsation monitoring and processing center (4) is connected with the control end of a fuel quantity control valve and an air quantity regulating valve of the boiler (7) through a feedback control unit (5).
2. The boiler combustion pressure pulsation control system with triple redundancy function according to claim 1, characterized in that the fiber optic pressure pulsation sensor (1) comprises a first fiber optic probe (8), a second fiber optic probe (9), a third fiber optic probe (10), a sensor upper cover (11), an upper thermal insulation layer (12), a sensor lower cover (13), a lower thermal insulation layer (14) and a permeable membrane (19);
an upper heat insulation layer (12) is arranged between the bottom of an upper sensor cover (11) and the top of a lower sensor cover (13), a lower heat insulation layer (14) is arranged at the bottom of the lower sensor cover (13), a pressure measurement cavity (18) is arranged at the bottom of the lower sensor cover (13), a first metal sensing diaphragm (20), a second metal sensing diaphragm (21) and a third metal sensing diaphragm (16) are arranged in the pressure measurement cavity (18), a first vacuum heat insulation cavity (17) is formed between the first metal sensing diaphragm (20) and one side wall of the pressure measurement cavity (18), a second vacuum heat insulation cavity (22) is formed between the second metal sensing diaphragm (21) and the top of the pressure measurement cavity (18), a third vacuum heat insulation cavity (15) is formed between the third metal sensing diaphragm (16) and the other side wall of the pressure measurement cavity (18), and a first optical fiber probe (8) penetrates through the side wall of the lower sensor cover (13) after penetrating through the upper sensor cover (11) and the upper heat insulation layer (12) and is inserted into the first vacuum heat insulation layer (12) The second optical fiber probe (9) penetrates through the upper sensor cover (11) and then is inserted into the second vacuum heat insulation cavity (22) and is opposite to the second metal sensing diaphragm (21), and the third optical fiber probe (10) penetrates through the upper sensor cover (11) and the upper heat insulation layer (12) and then penetrates through the side wall of the lower sensor cover (13) and then is inserted into the third vacuum heat insulation cavity (15) and is opposite to the third metal sensing diaphragm (16);
the first optical fiber probe (8), the second optical fiber probe (9) and the third optical fiber probe (10) are connected with the optical signal conditioning module (2) through an optical fiber bundle (6) and a light source, a penetrating film (19) is arranged at the bottom opening of the pressure measuring cavity (18), a plurality of air guide holes are formed in the penetrating film (19), and the pressure measuring cavity (18) is communicated with a pressure measuring port of the boiler (7) through the air guide holes.
3. Boiler combustion pressure pulsation control system with triple redundancy function according to claim 2, characterized by further comprising a mounting nut (23); the mounting nut (23) is sleeved on the peripheries of the sensor upper cover (11), the upper heat insulation layer (12) and the sensor lower cover (13).
4. Boiler combustion pressure pulsation control system with triple redundancy function according to claim 2, characterized in that the axes of the sensor upper cover (11), the upper insulation layer (12), the sensor lower cover (13) and the lower insulation layer (14) coincide.
5. The boiler combustion pressure pulsation control system with triple redundancy function according to claim 2, wherein the sensor upper cover (11), the upper heat insulating layer (12), the sensor lower cover (13) and the lower heat insulating layer (14) are connected by diffusion welding.
6. The boiler combustion pressure pulsation control system with triple redundancy function according to claim 2, characterized in that the outer diameter of the sensor upper cover (11) is 12mm, the length is 15mm, the outer diameter of the upper heat insulating layer (12) is 12mm, the thickness is 2mm, the side length of the central square hole on the upper heat insulating layer (12) is 2mm, the outer diameter of the upper heat insulating layer (12) is 12mm, the length of the pressure measuring chamber (18) is 6mm, the width is 2mm, the height is 2mm, the outer diameter of the lower heat insulating layer (14) is 12mm, the thickness is 5mm, the side length of the central square hole on the lower heat insulating layer (14) is 2 mm; the diameters of the first optical fiber probe (8), the second optical fiber probe (9) and the third optical fiber probe (10) are all 1 mm; the side lengths of the first metal sensing diaphragm (20), the second metal sensing diaphragm (21) and the third metal sensing diaphragm (16) are all 3mm, and the thickness of the first metal sensing diaphragm is 1 mm; the pore diameter of the air guide hole is 0.5 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111335554.3A CN114046534A (en) | 2021-11-11 | 2021-11-11 | Boiler combustion pressure pulsation control system with triple redundancy function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111335554.3A CN114046534A (en) | 2021-11-11 | 2021-11-11 | Boiler combustion pressure pulsation control system with triple redundancy function |
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| CN114046534A true CN114046534A (en) | 2022-02-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111335554.3A Pending CN114046534A (en) | 2021-11-11 | 2021-11-11 | Boiler combustion pressure pulsation control system with triple redundancy function |
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| CN (1) | CN114046534A (en) |
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2021
- 2021-11-11 CN CN202111335554.3A patent/CN114046534A/en active Pending
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