CN213686911U - Primary air monitoring system capable of achieving online monitoring - Google Patents
Primary air monitoring system capable of achieving online monitoring Download PDFInfo
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- CN213686911U CN213686911U CN202022645864.2U CN202022645864U CN213686911U CN 213686911 U CN213686911 U CN 213686911U CN 202022645864 U CN202022645864 U CN 202022645864U CN 213686911 U CN213686911 U CN 213686911U
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Abstract
The utility model discloses a primary air monitoring system capable of realizing on-line monitoring, which comprises a coal mill, a coal powder separator, a coal powder distributor, an on-line 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 utility model relates to a coal fired boiler wind powder control system specifically is a can realize wind monitored control system once of on-line monitoring.
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, the combustion condition and the load condition cannot be obtained in time, and the adjustment is delayed, so that the safety and the economical efficiency of the unit operation are influenced.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem that exists among the prior art, the utility model provides a can realize wind monitored control system once of on-line monitoring helps realizing that pulverized coal furnace burns the optimization distribution of entry boundary condition and optimizing regulation to reach higher combustion efficiency and environmental protection benefit.
In order to realize the purpose, the utility model discloses a technical scheme is: the system can realize on-line monitoring of a primary air monitoring system, a coal mill, a coal powder separator, a coal powder distributor, an on-line 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.
Compared with the prior art, the utility model discloses following beneficial effect has at least:
the system can participate in the most critical three boundary condition of burning to getting into the combustor: the air flow velocity, the coal powder concentration and the coal powder fineness are monitored on line, and the data are fed back to the data control unit, so that accurate data support can be provided for adjusting the coal mill, the coal powder separator and the coal powder distributor in time, accurate data reference is provided for realizing optimal distribution and optimal adjustment of boundary conditions of a coal powder furnace combustion inlet, and the improvement of the combustion efficiency and the environmental protection benefit of a coal-fired unit is facilitated.
Drawings
Fig. 1 is a schematic view of the system flow 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 system can realize on-line monitoring of the primary air, and comprises a coal mill 1, a coal powder separator 2, a coal powder distributor 3, an on-line 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 1 is also provided with a temperature sensor, and the temperature sensor is connected with the input end of the data control unit.
The pulverized coal stream at the outlet of the coal mill 1 firstly enters a pulverized coal separator 2 to screen the fineness of the pulverized coal, the stream 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 stream into a plurality of equal streams 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 utility model discloses a coal pulverizer 1, buggy separator 2, buggy distributor 3, on-line monitoring device 4, 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 monitoring system capable of realizing online monitoring 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 (7)
1. The primary air monitoring system capable of realizing online monitoring 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 monitoring system capable of realizing online monitoring 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 monitoring system capable of realizing online monitoring 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 monitoring system capable of realizing online monitoring 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 flow velocity sensor and a pulverized coal concentration sensor.
5. The primary air monitoring system capable of realizing online monitoring 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 monitoring system capable of realizing online monitoring according to claim 1, wherein the pulverized coal distributor (3) adopts a double-adjustable pulverized coal distributor.
7. The primary air monitoring system capable of realizing online monitoring according to claim 1, characterized in that a temperature sensor is further arranged at the outlet of the coal mill, and the temperature sensor is connected with the input end of the data control unit (6).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022645864.2U CN213686911U (en) | 2020-11-16 | 2020-11-16 | Primary air monitoring system capable of achieving online monitoring |
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| CN202022645864.2U CN213686911U (en) | 2020-11-16 | 2020-11-16 | Primary air monitoring system capable of achieving online monitoring |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112268296A (en) * | 2020-11-16 | 2021-01-26 | 西安热工研究院有限公司 | Primary air control system capable of realizing online monitoring and intelligent adjustment and operation method |
| 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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2020
- 2020-11-16 CN CN202022645864.2U patent/CN213686911U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112268296A (en) * | 2020-11-16 | 2021-01-26 | 西安热工研究院有限公司 | Primary air control system capable of realizing online monitoring and intelligent adjustment and operation method |
| 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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