CN112607429A - Pneumatic ash conveying energy-saving control method for coal-fired power plant - Google Patents
Pneumatic ash conveying energy-saving control method for coal-fired power plant Download PDFInfo
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- CN112607429A CN112607429A CN202011388490.9A CN202011388490A CN112607429A CN 112607429 A CN112607429 A CN 112607429A CN 202011388490 A CN202011388490 A CN 202011388490A CN 112607429 A CN112607429 A CN 112607429A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
- B65G53/34—Details
- B65G53/40—Feeding or discharging devices
- B65G53/46—Gates or sluices, e.g. rotary wheels
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
- B65G53/04—Conveying materials in bulk pneumatically through pipes or tubes; Air slides
- B65G53/16—Gas pressure systems operating with fluidisation of the materials
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
- B65G53/34—Details
- B65G53/40—Feeding or discharging devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
- B65G53/34—Details
- B65G53/66—Use of indicator or control devices, e.g. for controlling gas pressure, for controlling proportions of material and gas, for indicating or preventing jamming of material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G2201/00—Indexing codes relating to handling devices, e.g. conveyors, characterised by the type of product or load being conveyed or handled
- B65G2201/04—Bulk
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Air Transport Of Granular Materials (AREA)
Abstract
The invention provides a pneumatic ash conveying energy-saving control method for a coal-fired power plant. According to the invention, the feeding ash loading time and the cycle period can be automatically adjusted according to the conveying difficulty of fly ash generated by a power plant boiler, so that the dynamic regulation of the ash-gas ratio is realized, and the self-adaptive high-efficiency ash conveying function is achieved; the mismatching caused by manual parameter adjustment is effectively avoided; the unit energy consumption of the fly ash is greatly reduced, the ash-gas ratio can be controlled within a proper design range, the scouring abrasion of the pipeline valve caused by overhigh flow rate of the fly ash is reduced, the service life of equipment is prolonged, and the maintenance cost is reduced; the control method starts from a self-adaptive ash conveying control mode, effectively solves the outstanding problems of the system on the premise of not changing the design of a process system and increasing the investment, and improves the reliability and the economy of equipment.
Description
Technical Field
The invention belongs to the technical field of energy conservation, and particularly relates to a pneumatic ash conveying energy-saving control method for a coal-fired power plant.
Background
The thermal generator set has large change of ash content of fire coal, the adaptability of an ash conveying control system is not strong, phenomena of pipe blockage, high material level of an ash hopper, excessive abrasion of an ash pipe elbow and the like occur frequently, and the normal operation of an electric dust removal and ash conveying system is seriously influenced. The ash conveying control system mainly controls the ash feeding amount in a mode of presetting fixed time, and parameters cannot be properly adjusted in time according to working condition changes, so that the ash conveying ratio fluctuates in a large range. When the ash amount is large, the conveying output is insufficient, and pipe blockage occurs; the ash amount is small, the time for conveying is too long, the air consumption is large, and the equipment is excessively worn.
Currently, coal-fired power plants are generally mixed with economic coal types due to the pressure of operating cost; due to the change of the load of the power grid, the power grid often participates in deep peak regulation; because of environmental protection management and control upgrading, the ultra-clean emission of flue gas has basically been implemented. Due to the change of the factors, the existing ash conveying control mode of the power plant cannot be fully adapted to the wide change of coal blending ash content and unit load, and the economical efficiency and reliability of the system are influenced.
At present, the ash conveying control mode of domestic thermal power coal-fired units basically adopts a current 'time control and material level priority' mode. Under the dual pressure of the operation cost and the electric quantity, the load of the unit and the coal blending type change frequently, and the setting of each parameter of the ash conveying system has the common problems of mismatching following performance and insufficient timeliness. The control of the feeding time of the ash conveying bin pump based on the material level often causes malfunction or failure due to insufficient stability of a bin pump material level meter, the failure rate is high, and the maintenance workload is large. In the control mode, the difficult transportation of the fly ash and the easy pipe blockage often occur; the operation intensity is high, and the ash conveying step sequence is required to be frequently and manually operated to manually remove the ash blockage of the system.
As mentioned above, the traditional ash conveying control mode can not adapt to the current situations of wide load adjustment of a unit and large ash change of economic coal types, and the unit ash conveying energy consumption is overlarge. When the ash is low in load and ash content, the air delivery time is long, the flow rate is high, the equipment wear is aggravated, the ash storehouse is frequently positively pressurized, and the ash leaks outwards. When high load is high in ash content, ash frequently occurs to block the pipe, the material level of the ash hopper is high, and the safety of the dust remover is influenced.
Therefore, it is an urgent problem for those skilled in the art to develop a method capable of optimizing the existing ash conveying control system.
Disclosure of Invention
In order to solve the problems, the invention discloses a pneumatic ash conveying energy-saving control method for a coal-fired power plant.
In order to achieve the purpose, the invention provides the following technical scheme:
a coal-fired power plant pneumatic ash conveying energy-saving control method comprises the following steps: and judging the current ash feeding amount according to the conveying pressure and the conveying time of the current conveying cycle, and automatically adjusting the feeding ash loading time and the cycle period time of the next conveying cycle according to the change of the ash feeding amount. And further, the conveying pressure is measured by a pressure transmitter arranged behind the discharge valve on each conveying pipeline, and the conveying pressure and the duration time are recorded and transmitted by an automatic conveying pressure judgment loop.
Further, the conveying time is the time length for each conveying unit to stop conveying ash after the discharge valve is opened to meet the ash conveying condition in the automatic conveying mode and then is closed.
Further, the specific control method is as follows:
s1, taking the fly ash conveying of each time by the bin pump set as a working cycle, and dividing the working cycle into four stages respectively comprising: a feeding ash-loading stage, a fluidization stage, a conveying stage and a purging stage;
s2, recording the actual time consumption of the conveying stage in the current working cycle as conveying time, establishing a functional relation by taking the feeding ash loading time as an independent variable and the conveying time as a dependent variable, and establishing a control model;
and S3, judging the current ash feeding amount according to the control model, feeding back and adjusting the feeding ash loading time of the next working cycle of the bin pump, and dynamically controlling the ash-air ratio within a reasonable range.
Further, in step S2, the actual elapsed time of the conveying phase in the current working cycle is recorded by the DCS system.
Compared with the prior art, the invention has the following beneficial effects:
1. the feeding ash loading time and the cycle period can be automatically adjusted according to the conveying difficulty of the fly ash generated by the power plant boiler, the dynamic adjustment of the ash-gas ratio is realized, and the self-adaptive high-efficiency ash conveying function is achieved;
2. the mismatching caused by manual parameter adjustment is effectively avoided;
3. the unit energy consumption of the fly ash is greatly reduced, the ash-gas ratio can be controlled within a proper design range, the scouring abrasion of the pipeline valve caused by overhigh flow rate of the fly ash is reduced, the service life of equipment is prolonged, and the maintenance cost is reduced;
4. the control method starts from a self-adaptive ash conveying control mode, effectively solves the outstanding problems of the system on the premise of not changing the design of a process system and increasing the investment, and improves the reliability and the economy of equipment.
Drawings
FIG. 1, a flow chart of the present invention;
fig. 2 is a control schematic block diagram of an embodiment of the present invention.
Detailed Description
The technical solutions provided by the present invention will be described in detail below with reference to specific examples, and it should be understood that the following specific embodiments are only illustrative of the present invention and are not intended to limit the scope of the present invention.
The invention provides a pneumatic ash conveying energy-saving control method for a coal-fired power plant, which comprises the following steps: and judging the current ash feeding amount according to the conveying pressure and the conveying time of the current conveying cycle, and automatically adjusting the feeding ash loading time and the cycle period time of the next conveying cycle according to the change of the ash feeding amount. The conveying pressure is measured by a pressure transmitter arranged behind the discharge valve on each conveying pipeline, and the conveying pressure and the duration time are recorded and transmitted by an automatic conveying pressure judging loop.
The conveying pressure is measured by a pressure transmitter arranged on the upper part of the last bin pump of each conveying unit, and the conveying pressure and the duration time are recorded and transmitted by an automatic conveying pressure judging loop.
The conveying time is the time length of stopping conveying ash when the discharge valve of each conveying unit is opened to meet the conveying condition in the automatic conveying mode and then is closed. As shown in fig. 1, the specific control method is as follows:
s1, taking the fly ash conveying of each time by the bin pump set as a working cycle, and dividing the working cycle into four stages respectively comprising: a feeding ash-loading stage, a fluidization stage, a conveying stage and a purging stage;
s2, recording the actual time consumption of the conveying stage in the current working cycle as conveying time, establishing a functional relation by taking the feeding ash loading time as an independent variable and the conveying time as a dependent variable, and establishing a control model;
specifically, in the step, the actual time consumption of the conveying stage in the current working cycle is recorded through the DCS system;
and S3, judging the current ash feeding amount according to the control model, feeding back and adjusting the feeding ash loading time of the next working cycle of the bin pump, and dynamically controlling the ash-air ratio within a reasonable range.
The following embodiment is based on an ultra-supercritical unit ash conveying system of a Huanengyanling power plant (2 x 1030 MW), and performs pneumatic ash conveying energy-saving optimization, wherein the ash conveying system adopts a turbulent flow double-sleeve multi-bin pump series pneumatic ash removal technology, each furnace is provided with 2 three-chamber four-electric-field electric dust collectors, 24 independent electric fields are provided, and each electric field is provided with 2 ash hoppers.
The specific energy-saving control principle is shown in fig. 2:
when the current working cycle of the bin-pump set starts, the conveying pressure and the conveying time of the current conveying cycle are obtained; if the conveying pressure is greater than 0.07MPa, judging the ash amount according to whether the conveying time is greater than 200s, if the conveying time is greater than 200s, judging that the ash amount is large at the moment, otherwise, judging that the ash amount is small at the moment; if the conveying pressure is not more than 0.07MPa, judging the ash amount according to whether the conveying time is more than 250s, if the conveying time is more than 250s, judging that the ash amount is larger at the moment, and if not, judging that the ash amount is smaller at the moment.
When the ash amount in the current conveying cycle is judged to be smaller, if the conveying time does not exceed 120s, the feeding and ash loading time of the next working cycle is increased by 20 s; if the conveying time is more than 120s, further judging according to the cycle period, if the cycle period does not exceed 620s, increasing the cycle period of the next working cycle by 30s, and if not, keeping the current working cycle to be ended; and if the conveying time is more than 120s, keeping the current work cycle till the end.
When the ash amount in the current conveying cycle is judged to be large, if the conveying time is not less than 250s, the feeding and ash loading time of the next working cycle is reduced by 20s, meanwhile, the judgment is carried out according to the cycle period, if the cycle period is not less than 420s, the cycle period of the next working cycle is reduced by 30s, and otherwise, the working cycle of the retainer ring is kept to the end; and if the conveying time is less than 250s, keeping the current work cycle till the end.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the technical solutions, and those skilled in the art should understand that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all the modifications and equivalent substitutions should be covered by the claims of the present invention.
Claims (5)
1. A coal-fired power plant pneumatic ash conveying energy-saving control method is characterized by comprising the following steps: the control method comprises the following steps: and judging the current ash feeding amount according to the conveying pressure and the conveying time of the current conveying cycle, and automatically adjusting the feeding ash loading time and the cycle period time of the next conveying cycle according to the change of the ash feeding amount.
2. The pneumatic ash conveying energy-saving control method for the coal-fired power plant according to claim 1, characterized in that: the conveying pressure is measured by a pressure transmitter arranged behind the discharge valve on each conveying pipeline, and the conveying pressure and the duration time are recorded and transmitted by an automatic conveying pressure judging loop.
3. The pneumatic ash conveying energy-saving control method for the coal-fired power plant according to claim 2, characterized in that: the conveying time is the time length for each conveying unit to stop conveying ash after the discharge valve is opened to meet the conveying condition in the automatic conveying mode and then is closed.
4. The pneumatic ash conveying energy-saving control method for the coal-fired power plant according to claim 1, characterized in that: the specific control method comprises the following steps:
s1, taking the fly ash conveying of each time by the bin pump set as a working cycle, and dividing the working cycle into four stages respectively comprising: a feeding ash-loading stage, a fluidization stage, a conveying stage and a purging stage;
s2, recording the actual time consumption of the conveying stage in the current working cycle as conveying time, establishing a functional relation by taking the feeding ash loading time as an independent variable and the conveying time as a dependent variable, and establishing a control model;
and S3, feeding back and adjusting the feeding ash loading time of the next working cycle of the bin pump set according to the control model, and dynamically controlling the ash-gas ratio within a reasonable range.
5. The pneumatic ash conveying energy-saving control method for the coal-fired power plant according to claim 4, characterized in that: in step S2, the actual elapsed time of the conveying phase in the current work cycle is recorded by the DCS system.
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| CN202011388490.9A CN112607429A (en) | 2020-12-02 | 2020-12-02 | Pneumatic ash conveying energy-saving control method for coal-fired power plant |
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| CN202011388490.9A CN112607429A (en) | 2020-12-02 | 2020-12-02 | Pneumatic ash conveying energy-saving control method for coal-fired power plant |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114701863A (en) * | 2022-04-22 | 2022-07-05 | 北京中电博天科技有限公司 | Visual intelligent energy-saving method and device for pneumatic conveying system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5071289A (en) * | 1989-12-27 | 1991-12-10 | Alpheus Cleaning Technologies Corp. | Particulate delivery system |
| CN202414800U (en) * | 2012-01-05 | 2012-09-05 | 华能国际电力股份有限公司玉环电厂 | Energy-saving dry ash removing intelligent conveying device of coal-fired power plant |
| CN109733891A (en) * | 2018-12-04 | 2019-05-10 | 江苏微优软件科技有限公司 | A kind of storehouse pump is energy saving to detect control instrument and its working method |
| CN111722611A (en) * | 2020-05-15 | 2020-09-29 | 北京国电富通科技发展有限责任公司 | Intelligent ash removal adjusting system and method based on big data of unit parameters |
| CN111807060A (en) * | 2020-07-01 | 2020-10-23 | 广东粤电靖海发电有限公司 | Positive-pressure concentrated-phase pneumatic ash conveying method and system for energy-saving coal-fired power plant |
-
2020
- 2020-12-02 CN CN202011388490.9A patent/CN112607429A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5071289A (en) * | 1989-12-27 | 1991-12-10 | Alpheus Cleaning Technologies Corp. | Particulate delivery system |
| CN202414800U (en) * | 2012-01-05 | 2012-09-05 | 华能国际电力股份有限公司玉环电厂 | Energy-saving dry ash removing intelligent conveying device of coal-fired power plant |
| CN109733891A (en) * | 2018-12-04 | 2019-05-10 | 江苏微优软件科技有限公司 | A kind of storehouse pump is energy saving to detect control instrument and its working method |
| CN111722611A (en) * | 2020-05-15 | 2020-09-29 | 北京国电富通科技发展有限责任公司 | Intelligent ash removal adjusting system and method based on big data of unit parameters |
| CN111807060A (en) * | 2020-07-01 | 2020-10-23 | 广东粤电靖海发电有限公司 | Positive-pressure concentrated-phase pneumatic ash conveying method and system for energy-saving coal-fired power plant |
Non-Patent Citations (2)
| Title |
|---|
| 刘磊: "火力发电厂紊流双套管气力除灰技术与单管气力输灰技术浅析", 《科技创新导报》 * |
| 周斌等: "某600MW燃煤机组干除灰系统程序优化改造", 《山东工业技术》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114701863A (en) * | 2022-04-22 | 2022-07-05 | 北京中电博天科技有限公司 | Visual intelligent energy-saving method and device for pneumatic conveying system |
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Application publication date: 20210406 |
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