CN112268296A - Primary air control system capable of realizing online monitoring and intelligent adjustment and operation method - Google Patents
Primary air control system capable of realizing online monitoring and intelligent adjustment and operation method Download PDFInfo
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- CN112268296A CN112268296A CN202011280829.3A CN202011280829A CN112268296A CN 112268296 A CN112268296 A CN 112268296A CN 202011280829 A CN202011280829 A CN 202011280829A CN 112268296 A CN112268296 A CN 112268296A
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- coal
- pulverized coal
- coal powder
- distributor
- fineness
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N3/00—Regulating air supply or draught
- F23N3/002—Regulating air supply or draught using electronic means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N1/00—Regulating fuel supply
- F23N1/02—Regulating fuel supply conjointly with air supply
- F23N1/022—Regulating fuel supply conjointly with air supply using electronic means
Abstract
The invention discloses a primary air control system capable of realizing online monitoring and intelligent adjustment and an operation method thereof, wherein the system comprises a coal mill, a coal powder separator, a coal powder distributor, an online monitoring device and a data control unit; the coal mill, the coal powder separator, the coal powder distributor and the boiler are sequentially connected; the on-line monitoring device is connected with the input end of the data control unit, monitors the fineness of coal powder, the flow rate of the coal powder and the concentration of the coal powder in the coal powder pipeline on line, and feeds monitoring data back to the data control unit, and the data control unit is connected with the control input ends of the adjusting devices of the coal powder separator and the coal powder distributor; according to a preset coal powder fineness threshold, the coal powder separator is adjusted to realize reasonable control of the coal powder fineness, online monitoring and adjustment of three key boundary conditions are realized to realize closed loop, the three key boundary conditions are always in an optimal range, optimal distribution and optimal adjustment of the boundary conditions at the combustion inlet of the coal powder furnace are realized, and higher combustion efficiency and environmental protection benefits are achieved.
Description
Technical Field
The invention relates to a primary air-powder control system of a coal-fired boiler, in particular to a primary air control system capable of realizing online monitoring and intelligent adjustment and an operation method.
Background
Most of the existing power station boilers are pulverized coal boilers, the combustion of the pulverized coal boilers is organized by primary air, secondary air, tertiary air and the like, wherein the primary air carries pulverized coal to initially combust, and the secondary air and the tertiary air supplement oxygen required in the later combustion stage. The primary air carries pulverized coal to be sprayed into a hearth in a jet flow mode through a combustor, high-temperature flue gas around the mat combustor is diffused and reflowed through turbulence, and meanwhile, the high-temperature flue gas is heated to reach a certain temperature by radiation of the periphery of the hearth and high-temperature flame and then is ignited and combusted, so that the influence of the primary air on the combustion condition is very important.
The uniform distribution of the primary wind speed (flow) and the coal powder concentration of each powder pipe plays a vital role in improving the combustion condition in the furnace, optimizing the aerodynamic field and the temperature field, and has positive significance in inhibiting the generation of pollutants such as nitrogen oxides. The guide rule of the model selection of the coal mill and the pulverizing system of the power station (DL/T466-2017) recommends that the flow distribution deviation of the outlet powder pipe of the coal mill is generally controlled within +/-5 percent. The reasonably adjustable coal powder fineness is also beneficial to improving the combustion economy and stability of each load section of the boiler.
However, no matter in tangential firing, opposed firing or W flame firing, one coal mill generally corresponds to 4-6 burners (powder pipes), and the problems of uneven distribution of air volume and coal powder concentration generally exist among the burners, so that the problems of uneven combustion, deviation of furnace chamber thermal load, slag bonding in the furnace, deviation of steam temperature and the like can be caused. Meanwhile, due to the lack of reliable monitoring means for the fineness of the pulverized coal, intelligent adjustment cannot be performed in real time according to the combustion condition and the load condition, and the safety and the economical efficiency of unit operation are also influenced.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a primary air control system capable of realizing online monitoring and intelligent adjustment and an operation method thereof, so that the optimal distribution and optimal adjustment of boundary conditions of a pulverized coal furnace combustion inlet are realized, and higher combustion efficiency and environmental protection benefits are achieved.
In order to achieve the purpose, the invention adopts the technical scheme that: the system comprises a primary air control system capable of realizing online monitoring and intelligent adjustment, a coal mill, a coal powder separator, a coal powder distributor, an online monitoring device and a data control unit; the outlet of the coal mill is connected with the inlet of the coal powder separator, the outlet of the coal powder separator is connected with the inlet of the coal powder distributor, and the coal powder is conveyed to the combustor of the boiler through the coal powder distributor; the on-line monitoring device is connected with the input end of the data control unit and is used for on-line monitoring the coal powder fineness, the air flow velocity and the coal powder concentration of the coal powder air flow in the coal powder pipeline and feeding back the monitoring data to the data control unit, and the output end of the data control unit is connected with the control input ends of the adjusting devices of the coal powder separator and the coal powder distributor.
The on-line monitoring device comprises a coal powder fineness monitoring sensor, an air flow velocity sensor and a coal powder concentration sensor.
The outlet of the coal powder separator is provided with a coal powder fineness detection sensor and a coal powder concentration sensor.
The output of the coal powder distributor comprises a plurality of branches, and each branch is internally provided with a coal powder fineness sensor, an airflow flow velocity sensor and a coal powder concentration sensor.
The pulverized coal distributor is divided into a concentrated phase branch and a dilute phase branch, and the concentrated phase branch and the dilute phase branch are provided with 2-4 paths.
The coal powder distributor adopts double adjustable coal powder distributors.
And the outlet of the coal mill is also provided with a temperature sensor which is connected with the input end of the data control unit.
Based on the operation method of the boiler primary air control system, pulverized coal airflow at the outlet of a coal mill firstly enters a pulverized coal separator to screen the fineness of pulverized coal, the airflow carrying the pulverized coal with qualified fineness enters a pulverized coal distributor through a pulverized coal pipeline, and the pulverized coal distributor divides the pulverized coal airflow into a plurality of equal airflows which are then conveyed to a burner of a boiler through the pulverized coal pipeline; the on-line monitoring device measures the fineness of the pulverized coal, the flow velocity of the pulverized coal and the concentration of the pulverized coal on a pulverized coal pipeline, the measurement result is sent to the data control unit, the data control unit sends an adjusting instruction to the adjusting devices of the pulverized coal separator and the pulverized coal distributor, and the pulverized coal separator and the pulverized coal distributor change the operation parameters to control the fineness of the pulverized coal and the concentration of the pulverized coal within a preset range.
Setting the threshold values of the fineness of the coal powder, the flow velocity of the air flow and the concentration of the coal powder for each branch pipeline at the outlet of the coal powder distributor, comparing the data acquired in real time with the threshold values of the flow velocity of the air flow and the concentration of the coal powder by the data control unit, and if the data acquired in real time exceed the threshold values, sending an adjusting instruction to the coal powder separator and the adjusting device of the coal powder distributor by the data control unit until the data acquired in real time are within the threshold value range.
The threshold values of the coal powder fineness, the airflow velocity and the coal powder concentration are correspondingly set according to the boundary conditions of the coal powder fineness, the airflow velocity and the coal powder concentration.
Compared with the prior art, the invention has at least the following beneficial effects:
the system of the invention can realize three most critical boundary conditions for entering the combustor to participate in combustion: the method comprises the following steps of monitoring the air flow velocity, the coal powder concentration and the coal powder fineness on line, feeding data back to a data control unit, and adjusting a coal powder distributor to realize reasonable distribution of flow and concentration by the data control unit according to preset primary air flow velocity and coal powder concentration deviation logic; and adjusting the coal powder separator to realize reasonable control of the coal powder fineness according to preset coal powder fineness control logic.
Based on the system, the airflow velocity and the pulverized coal concentration threshold are set according to the airflow velocity, the pulverized coal concentration and the pulverized coal fineness, and the pulverized coal concentration and the airflow velocity are adjusted according to real-time monitoring data, so that the online monitoring and adjustment of the airflow velocity, the pulverized coal concentration and the pulverized coal fineness are closed, the closed loop is always in the optimal range, the optimal distribution and the optimal adjustment of the boundary conditions of the combustion inlet of the pulverized coal furnace are realized, and the higher combustion efficiency and the environmental protection benefit are achieved.
Drawings
FIG. 1 is a schematic flow chart of the system of the present invention.
In the figure: the system comprises a coal mill 1, a coal powder separator 2, a coal powder distributor 3, an online monitoring device 4, a boiler 5 and a data control unit 6.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
The primary air control system can realize online monitoring and intelligent adjustment, and comprises a coal mill 1, a coal powder separator 2, a coal powder distributor 3, an online monitoring device 4 and a data control unit 6; the outlet of the coal mill 1 is connected with the inlet of the coal powder separator 2, the outlet of the coal powder separator 2 is connected with the inlet of the coal powder distributor 3, and the coal powder is conveyed to the combustor of the boiler 5 through the coal powder distributor 3; the on-line monitoring device 4 is connected with the input end of the data control unit 6, the on-line monitoring device 4 is used for on-line monitoring the coal powder fineness, the air flow velocity and the coal powder concentration of the coal powder air flow in the coal powder pipeline, meanwhile, monitoring data are fed back to the data control unit 6, and the output end of the data control unit 6 is connected with the control input ends of the adjusting devices of the coal powder separator 2 and the coal powder distributor 3.
The on-line monitoring device 4 comprises a coal powder fineness monitoring sensor, an air flow velocity sensor and a coal powder concentration sensor.
And a coal powder fineness detection sensor and a coal powder concentration sensor are arranged at the outlet of the coal powder separator 2.
The output of the coal powder distributor 3 comprises a plurality of branches, and each branch is provided with a coal powder fineness sensor, an airflow flow velocity sensor and a coal powder concentration sensor.
The coal powder distributor 3 is divided into a concentrated phase branch and a dilute phase branch, and the concentrated phase branch and the dilute phase branch are provided with 2-4 paths.
The coal powder distributor 3 adopts double adjustable coal powder distributors.
And the outlet of the coal mill is also provided with a temperature sensor which is connected with the input end of the data control unit.
Based on the operation method of the boiler primary air control system, pulverized coal airflow at the outlet of a coal mill 1 firstly enters a pulverized coal separator 2 to screen the fineness of pulverized coal, the airflow carrying the pulverized coal with qualified fineness enters a pulverized coal distributor 3 through a pulverized coal pipeline, and the pulverized coal distributor 3 divides the pulverized coal airflow into a plurality of equal airflows which are then conveyed to a burner of a boiler 5 through the pulverized coal pipeline; the on-line monitoring device 4 measures the fineness of the pulverized coal, the flow velocity of the pulverized coal and the concentration of the pulverized coal in the pulverized coal pipeline, the measurement result is sent to the data control unit 6, the data control unit 6 sends an adjusting instruction to the adjusting devices of the pulverized coal separator 2 and the pulverized coal distributor 3, and the pulverized coal separator 2 and the pulverized coal distributor 3 change the operation parameters to control the fineness of the pulverized coal and the concentration of the pulverized coal in a preset range.
Setting thresholds of coal powder fineness, airflow flow rate and coal powder concentration for each pipeline at the outlet of the coal powder distributor 3, comparing data acquired in real time with the thresholds of the airflow flow rate and the coal powder concentration by the data control unit 6, and if the data acquired in real time exceed the thresholds, sending an adjusting instruction to the adjusting devices of the coal powder separator 2 and the coal powder distributor 3 by the data control unit 6 until the data acquired in real time are within the threshold range.
The threshold values of the coal powder fineness, the airflow velocity and the coal powder concentration are correspondingly set according to the boundary conditions of the coal powder fineness, the airflow velocity and the coal powder concentration.
Referring to fig. 1, the coal pulverizer of the present invention includes a coal pulverizer 1, a coal dust separator 2, a coal dust distributor 3, an online monitoring device 4, and a data control unit 6. The coal pulverizer 1 is characterized in that coal dust airflow at an outlet of the coal pulverizer 1 firstly enters a coal dust separator 2 to screen the fineness of coal dust, the airflow carrying coal dust with qualified fineness continuously enters a coal dust pipeline and a coal dust distributor 3, and the coal dust distributor 3 divides the coal dust airflow into 4-6 equal airflows which are then conveyed to a burner of a boiler 5 through the coal dust pipeline. The on-line monitoring device 4 measures the fineness of the pulverized coal, the flow velocity of the pulverized coal and the concentration of the pulverized coal in the pulverized coal pipeline, and sends the measurement results to the data control unit 6. The data control unit 6 controls the adjusting devices of the coal powder separator 2 and the coal powder distributor 3 according to the preset calculation logic, so that the fineness of the coal powder is controlled in the most economic range, and the flow velocity and the concentration of the coal powder airflow are uniformly distributed among the powder pipes, thereby achieving the best combustion effect and improving the safety, the economy and the environmental protection of the unit operation.
Specifically, the pulverized coal concentration sensor comprises a pulverized coal concentration sensor for monitoring a dilute phase and a pulverized coal concentration sensor for monitoring a concentrated phase.
A primary air control system capable of realizing online monitoring and intelligent adjustment is characterized in that three boundary conditions which are most critical to entering a combustor to participate in combustion are as follows: the flow velocity of pulverized coal airflow, the concentration of pulverized coal and the fineness of pulverized coal are monitored on line, data are fed back to a data control unit, and the data control unit adjusts a pulverized coal distributor to realize reasonable distribution of flow and concentration according to preset primary air flow velocity and pulverized coal concentration deviation logic; and adjusting the coal powder separator to realize reasonable control of the coal powder fineness according to preset coal powder fineness control logic. Therefore, the online monitoring and adjustment of the three key boundary conditions are closed-loop, the three key boundary conditions are always in the optimal range, the optimal distribution and the optimal adjustment of the boundary conditions of the pulverized coal furnace combustion inlet are realized, and the higher combustion efficiency and the environmental protection benefit are achieved.
Claims (10)
1. The primary air control system capable of realizing online monitoring and intelligent adjustment is characterized by comprising a coal mill (1), a coal powder separator (2), a coal powder distributor (3), an online monitoring device (4) and a data control unit (6); the outlet of the coal mill (1) is connected with the inlet of the coal powder separator (2), the outlet of the coal powder separator (2) is connected with the inlet of the coal powder distributor (3), and the coal powder is conveyed to the combustor of the boiler (5) through the coal powder distributor (3); the on-line monitoring device (4) is connected with the input end of the data control unit (6), the on-line monitoring device (4) is used for monitoring the coal powder fineness, the air flow velocity and the coal powder concentration of the coal powder air flow in the coal powder pipeline on line, monitoring data are fed back to the data control unit (6) simultaneously, and the output end of the data control unit (6) is connected with the control input end of the adjusting device of the coal powder separator (2) and the coal powder distributor (3).
2. The primary air control system capable of realizing online monitoring and intelligent adjustment according to claim 1, wherein the online monitoring device (4) comprises a pulverized coal fineness monitoring sensor, an airflow flow velocity sensor and a pulverized coal concentration sensor.
3. The primary air control system capable of realizing online monitoring and intelligent adjustment according to claim 1, wherein a pulverized coal fineness detection sensor and a pulverized coal concentration sensor are arranged at an outlet of the pulverized coal separator (2).
4. The primary air control system capable of realizing online monitoring and intelligent adjustment according to claim 1, wherein the output of the pulverized coal distributor (3) comprises a plurality of branches, and each branch is provided with a pulverized coal fineness sensor, an airflow velocity sensor and a pulverized coal concentration sensor.
5. The primary air control system capable of realizing online monitoring and intelligent adjustment according to claim 1, wherein the pulverized coal distributor (3) is divided into a concentrated phase branch and a dilute phase branch, and the concentrated phase branch and the dilute phase branch are provided with 2-4 paths.
6. The primary air control system capable of realizing online monitoring and intelligent adjustment according to claim 1, wherein the pulverized coal distributor (3) adopts a double-adjustable pulverized coal distributor.
7. The primary air control system capable of realizing online monitoring and intelligent adjustment according to claim 1, wherein a temperature sensor is further arranged at an outlet of the coal mill, and the temperature sensor is connected with an input end of the data control unit (6).
8. The operation method of the primary air control system of the boiler based on the claim 1 is characterized in that a pulverized coal airflow at an outlet of a coal mill (1) firstly enters a pulverized coal separator (2) to screen the fineness of the pulverized coal, the airflow carrying the pulverized coal with qualified fineness enters a pulverized coal distributor (3) through a pulverized coal pipeline, and the pulverized coal distributor (3) divides the pulverized coal airflow into a plurality of equal airflows which are then conveyed to a burner of the boiler (5) through the pulverized coal pipeline; the on-line monitoring device (4) measures the fineness of the pulverized coal, the flow velocity of the pulverized coal and the concentration of the pulverized coal on a pulverized coal pipeline, the measurement result is sent to the data control unit (6), the data control unit (6) sends an adjusting instruction to adjusting devices of the pulverized coal separator (2) and the pulverized coal distributor (3), and the pulverized coal separator (2) and the pulverized coal distributor (3) change operation parameters to control the fineness of the pulverized coal and the concentration of the pulverized coal within a preset range.
9. The operation method according to claim 8, characterized in that threshold values of coal dust fineness, air flow velocity and coal dust concentration are set for each branch pipeline at the outlet of the coal dust distributor (3), the data control unit (6) compares the data collected in real time with the threshold values of the air flow velocity and the coal dust concentration, and if the data collected in real time exceeds the threshold values, the data control unit (6) sends an adjusting instruction to the adjusting devices of the coal dust separator (2) and the coal dust distributor (3) until the data collected in real time is within the threshold value range.
10. The operation method according to claim 8, wherein the thresholds for the fineness of the pulverized coal, the flow rate of the air stream, and the concentration of the pulverized coal are set in correspondence to boundary conditions according to the fineness of the pulverized coal, the flow rate of the air stream, and the concentration of the pulverized coal, respectively.
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| CN202011280829.3A CN112268296A (en) | 2020-11-16 | 2020-11-16 | Primary air control system capable of realizing online monitoring and intelligent adjustment and operation method |
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| CN202011280829.3A CN112268296A (en) | 2020-11-16 | 2020-11-16 | Primary air control system capable of realizing online monitoring and intelligent adjustment and operation method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112902158A (en) * | 2021-03-01 | 2021-06-04 | 中国大唐集团科学技术研究院有限公司华中电力试验研究院 | Coal-fired power plant pulverized coal airflow deviation adjusting device and adjusting method |
| CN113551946A (en) * | 2021-06-26 | 2021-10-26 | 中国大唐集团科学技术研究院有限公司中南电力试验研究院 | Device and method for intelligently measuring fineness of pulverized coal |
| CN113578503A (en) * | 2021-07-13 | 2021-11-02 | 苏州西热节能环保技术有限公司 | Coal mill maintenance method and system, storage medium and terminal thereof |
| CN113834093A (en) * | 2021-11-01 | 2021-12-24 | 西安热工研究院有限公司 | Boiler oxygen content wide load optimization control system |
-
2020
- 2020-11-16 CN CN202011280829.3A patent/CN112268296A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112902158A (en) * | 2021-03-01 | 2021-06-04 | 中国大唐集团科学技术研究院有限公司华中电力试验研究院 | Coal-fired power plant pulverized coal airflow deviation adjusting device and adjusting method |
| CN112902158B (en) * | 2021-03-01 | 2023-10-20 | 中国大唐集团科学技术研究院有限公司华中电力试验研究院 | Coal-fired power plant pulverized coal airflow deviation adjusting device and adjusting method |
| CN113551946A (en) * | 2021-06-26 | 2021-10-26 | 中国大唐集团科学技术研究院有限公司中南电力试验研究院 | Device and method for intelligently measuring fineness of pulverized coal |
| CN113578503A (en) * | 2021-07-13 | 2021-11-02 | 苏州西热节能环保技术有限公司 | Coal mill maintenance method and system, storage medium and terminal thereof |
| CN113834093A (en) * | 2021-11-01 | 2021-12-24 | 西安热工研究院有限公司 | Boiler oxygen content wide load optimization control system |
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