CN212901594U - Closed-loop control system of compact pulverized coal distributor - Google Patents
Closed-loop control system of compact pulverized coal distributor Download PDFInfo
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- CN212901594U CN212901594U CN202021774875.4U CN202021774875U CN212901594U CN 212901594 U CN212901594 U CN 212901594U CN 202021774875 U CN202021774875 U CN 202021774875U CN 212901594 U CN212901594 U CN 212901594U
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Abstract
The utility model discloses a compact pulverized coal distributor closed-loop control system, which comprises a medium-speed coal mill, a coarse powder separator, a compact pulverized coal distributor, a DCS control system, a signal processor and a plurality of pulverized coal pipelines; the outlet of the medium-speed coal mill is communicated with the inlet of the coarse powder separator, the outlet of the coarse powder separator is communicated with the inlet of the compact pulverized coal distributor, the outlets of the compact pulverized coal distributor are respectively communicated with the inlets of pulverized coal pipelines, each pulverized coal pipeline is provided with an air-powder online measuring device, the output end of the air-powder online measuring device is connected with the inlet of the signal processor, the output end of the signal processor is connected with the DCS control system, the output end of the DCS control system is connected with the control end of the compact pulverized coal distributor, and the system can adjust the pulverized coal amount and the air volume deviation in each pulverized coal pipeline in real time.
Description
Technical Field
The utility model relates to a closed-loop control system, concretely relates to compact pulverized coal distributor closed-loop control system.
Background
Under the large background of deep peak shaving of a power station unit, the direct-current boiler of a large coal-fired unit is easy to have the safety production problems of large wall temperature deviation, local overtemperature of wall temperature, non-stop of pipe explosion and the like in the process of starting the boiler, long-term low-load operation and quick load lifting. The large coal-fired unit once-through boiler has the advantages that due to the design of a wide hearth and working medium once-through, the hydrodynamic rigidity in the starting process and under low load is weak, the boiler is very sensitive to the combustion uniformity in the boiler, and the combustion nonuniformity in the boiler is worse in the process of rapidly lifting the load. The combustion process in the furnace is a process that coal dust particles generate violent luminous heating chemical reaction, and the uniformity degree of the spatial distribution of the coal dust amount in the hearth directly influences the uniformity of the combustion in the furnace, so that the key for improving the deep peak regulation capability of the direct-flow boiler of the large coal-fired unit is to improve the distribution uniformity of the coal dust amount at the outlet of each combustor.
The device for improving the distribution uniformity of the coal powder quantity at the outlet of each combustor is a coal powder distributor, and the aim is to reduce the coal powder concentration and the wind speed deviation in each coal powder pipeline at the outlet of a coal mill. The compact pulverized coal distributor is worthy of promotion because the deviation of pulverized coal can be controlled within 10 percent and the deviation of wind speed can be controlled within 5 percent, and the compact pulverized coal distributor is also suitable for various compact and complex installation spaces on site. After the existing compact pulverized coal distributor is installed, a debugging worker adjusts the pulverized coal quantity and the wind speed deviation properly, the opening degree of the baffle is kept unchanged all the time in operation, but in the processes of variable coal quality, different working conditions and rapid load lifting, the pulverized coal quantity and the wind speed deviation have certain differences, and the fixed pulverized coal quantity and the opening degree of the wind volume adjusting baffle cannot ensure that the pulverized coal quantity in the furnace keeps distributed evenly all the time.
Therefore, a compact coal powder distributor closed-loop control system needs to be developed, which can adjust the coal powder amount and the air volume deviation in each coal powder pipeline in real time, and further improve the deep peak regulation capability, the refinement and the intelligent control level of the boiler.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome above-mentioned prior art's shortcoming, provide a compact buggy distributor closed-loop control system, this system can adjust buggy volume and the amount of wind deviation in each buggy pipeline in real time.
In order to achieve the purpose, the closed-loop control system of the compact pulverized coal distributor of the utility model comprises a medium-speed coal mill, a coarse powder separator, a compact pulverized coal distributor, a DCS control system, a signal processor and a plurality of pulverized coal pipelines;
the outlet of the medium-speed coal mill is communicated with the inlet of the coarse powder separator, the outlet of the coarse powder separator is communicated with the inlet of the compact coal powder distributor, the outlets of the compact coal powder distributor are respectively communicated with the inlets of the coal powder pipelines, each coal powder pipeline is provided with an air-powder online measuring device, the output end of the air-powder online measuring device is connected with the inlet of the signal processor, the output end of the signal processor is connected with the DCS control system, and the output end of the DCS control system is connected with the control end of the compact coal powder distributor.
The compact pulverized coal distributor comprises a plurality of bin bodies, wherein the bottom inlet of each bin body is communicated with the outlet of the coarse powder separator, one bin body corresponds to one pulverized coal pipeline, the top outlet of each bin body is communicated with the corresponding pulverized coal pipeline, a powder quantity adjusting device is arranged at the inlet of each bin body, an air quantity adjusting device is arranged between the outlet of each bin body and the inlet of the corresponding pulverized coal pipeline, and the output end of a DCS (distributed control system) is connected with the control end of the powder quantity adjusting device and the control end of the air quantity adjusting device.
The wind powder on-line measuring device is connected with the signal processor through a measuring signal transmission cable.
The output end of the DCS is connected with the control end of the powder amount adjusting device through a powder amount instruction control transmission cable.
The output end of the DCS control system is connected with the air volume adjusting device through an air volume instruction control transmission cable.
Each bin body is distributed along the circumferential direction.
The utility model discloses following beneficial effect has:
compact buggy distributor closed-loop control system when concrete operation, through wind speed in each buggy pipeline of wind powder on-line measuring device measurement, buggy concentration information, input into DCS control system after signal processor handles again, realize the closed-loop control to compact buggy volume adjusting device and air volume adjusting device, guarantee the wind speed of each combustor once, the real-time most balanced state of buggy volume distribution, the combustion effect in the stove has been improved, low nitrogen combustion potential has been excavated, the degree of depth peak regulation ability has been improved, the safe risk of wall temperature deviation and local overtemperature has been reduced.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
The system comprises a medium-speed coal mill 1, a coarse powder separator 2, a compact coal powder distributor 3, a bin body 4, a powder quantity adjusting device 5, an air quantity adjusting device 6, a coal powder pipeline 7, an air powder online measuring device 8, a signal processor 9, a DCS control system 10, a measuring signal transmission cable 11, a powder quantity instruction control transmission cable 12 and an air quantity instruction control transmission cable 13.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings:
referring to fig. 1, the closed-loop control system of the compact pulverized coal distributor of the present invention includes a medium speed coal mill 1, a coarse powder separator 2, a compact pulverized coal distributor 3, a DCS control system 10, a signal processor 9 and a plurality of pulverized coal pipelines 7; the outlet of the medium-speed coal mill 1 is communicated with the inlet of the coarse powder separator 2, the outlet of the coarse powder separator 2 is communicated with the inlet of the compact coal powder distributor 3, the outlets of the compact coal powder distributor 3 are respectively communicated with the inlets of the coal powder pipelines 7, an air powder online measuring device 8 is arranged on each coal powder pipeline 7, the output end of the air powder online measuring device 8 is connected with the inlet of the signal processor 9, the output end of the signal processor 9 is connected with the DCS control system 10, the output end of the DCS control system 10 is connected with the control end of the compact coal powder distributor 3, and the bin bodies 4 are distributed along the circumferential direction.
The compact coal powder distributor 3 comprises a plurality of bin bodies 4, wherein the bottom inlet of each bin body 4 is communicated with the outlet of the coarse powder separator 2, one bin body 4 corresponds to one coal powder pipeline 7, the top outlet of each bin body 4 is communicated with the corresponding coal powder pipeline 7, a powder quantity adjusting device 5 is arranged at the inlet of each bin body 4, an air quantity adjusting device 6 is arranged between the outlet of each bin body 4 and the inlet of the corresponding coal powder pipeline 7, and the output end of a DCS control system 10 is connected with the control end of the powder quantity adjusting device 5 and the control end of the air quantity adjusting device 6.
The wind powder on-line measuring device 8 is connected with the signal processor 9 through a measuring signal transmission cable 11; the output end of the DCS control system 10 is connected with the control end of the powder amount adjusting device 5 through a powder amount instruction control transmission cable 12; the output end of the DCS control system 10 is connected with the air volume adjusting device 6 through an air volume instruction control transmission cable 13.
The utility model discloses a concrete working process does:
after raw coal is dried and milled in a medium-speed coal mill 1, primary air carries the raw coal to enter a coarse powder separator 2, the raw coal is separated by the coarse powder separator 2, and a wind-powder mixture of coal powder with qualified fineness and the primary air enters a compact coal powder distributor 3; the compact coal powder distributor 3 comprises a plurality of bin bodies 4, each bin body 4 is directly communicated with an annular outlet of the coarse powder separator 2, the number of the bin bodies 4 is the same as that of the coal powder pipelines 7, the coal powder quantity is adjusted by adjusting the area of the inlets of the bin bodies 4 through a powder quantity adjusting device 5, an air quantity adjusting device 6 is arranged between the outlet of the bin body 4 and the inlets of the coal powder pipelines 7, and the air quantity is adjusted by adjusting resistance through the air quantity adjusting device 6.
The online wind-powder measuring device 8 measures wind speed and coal powder concentration signals in each coal powder pipeline 7 in real time, transmits the wind speed and coal powder concentration signals in each coal powder pipeline 7 to the signal processor 9 through the measuring signal transmission cable 11, the signal processor 9 filters the wind speed and coal powder concentration signals in each coal powder pipeline 7, then sends the processed wind speed and coal powder concentration signals in each coal powder pipeline 7 to the DCS control system 10, and the DCS control system 10 sends action instructions to the powder quantity regulating device 5 and the air quantity regulating device 6; that is, when the concentration of the pulverized coal in a certain pulverized coal pipeline 7 is higher, the opening degree of the baffle of the pulverized coal quantity adjusting device 5 corresponding to the pulverized coal pipeline 7 is reduced to reduce the pulverized coal quantity in the pulverized coal pipeline 7, and the principle of air quantity adjustment is the same.
Claims (6)
1. A closed-loop control system of a compact pulverized coal distributor is characterized by comprising a medium-speed coal mill (1), a coarse powder separator (2), the compact pulverized coal distributor (3), a DCS control system (10), a signal processor (9) and a plurality of pulverized coal pipelines (7);
the outlet of the medium-speed coal mill (1) is communicated with the inlet of the coarse powder separator (2), the outlet of the coarse powder separator (2) is communicated with the inlet of the compact coal powder distributor (3), each outlet of the compact coal powder distributor (3) is respectively communicated with the inlet of each coal powder pipeline (7), each coal powder pipeline (7) is provided with an air powder online measuring device (8), the output end of the air powder online measuring device (8) is connected with the inlet of the signal processor (9), the output end of the signal processor (9) is connected with the DCS control system (10), and the output end of the DCS control system (10) is connected with the control end of the compact coal powder distributor (3).
2. The closed-loop control system of the compact pulverized coal distributor according to claim 1, wherein the compact pulverized coal distributor (3) comprises a plurality of bin bodies (4), wherein a bottom inlet of each bin body (4) is communicated with an outlet of the coarse powder separator (2), one bin body (4) corresponds to one pulverized coal pipeline (7), wherein a top outlet of each bin body (4) is communicated with the corresponding pulverized coal pipeline (7), a powder quantity adjusting device (5) is arranged at an inlet of each bin body (4), an air quantity adjusting device (6) is arranged between an outlet of each bin body (4) and an inlet of the corresponding pulverized coal pipeline (7), and an output end of the DCS control system (10) is connected with a control end of the powder quantity adjusting device (5) and a control end of the air quantity adjusting device (6).
3. A closed loop control system for a compact pulverized coal dispenser as set forth in claim 2, characterized in that the on-line pulverized coal measuring device (8) is connected to the signal processor (9) via a measuring signal transmission cable (11).
4. A closed loop control system for a compact pulverized coal dispenser as set forth in claim 2, characterized in that the output of the DCS control system (10) is connected to the control end of the pulverized coal quantity adjusting device (5) via a pulverized coal quantity command control transmission cable (12).
5. The closed-loop control system for the compact pulverized coal distributor as set forth in claim 2, wherein the output end of the DCS control system (10) is connected to the air volume adjusting device (6) through an air volume command control transmission cable (13).
6. The closed-loop control system for a compact pulverized coal distributor according to claim 1, characterized in that each silo body (4) is distributed circumferentially.
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| CN202021774875.4U CN212901594U (en) | 2020-08-21 | 2020-08-21 | Closed-loop control system of compact pulverized coal distributor |
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| CN202021774875.4U CN212901594U (en) | 2020-08-21 | 2020-08-21 | Closed-loop control system of compact pulverized coal distributor |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113237056A (en) * | 2021-05-31 | 2021-08-10 | 西安热工研究院有限公司 | Primary air powder control system and method suitable for peak regulation |
| CN113477389A (en) * | 2021-06-11 | 2021-10-08 | 华能国际电力股份有限公司大连电厂 | Control method and device of powder making system |
| 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 |
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2020
- 2020-08-21 CN CN202021774875.4U patent/CN212901594U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113237056A (en) * | 2021-05-31 | 2021-08-10 | 西安热工研究院有限公司 | Primary air powder control system and method suitable for peak regulation |
| CN113477389A (en) * | 2021-06-11 | 2021-10-08 | 华能国际电力股份有限公司大连电厂 | Control method and device of powder making system |
| 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 |
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