CN114704845A - Dry slag discharging automatic control system and method with high-efficiency heat exchange and low air leakage rate - Google Patents
Dry slag discharging automatic control system and method with high-efficiency heat exchange and low air leakage rate Download PDFInfo
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- CN114704845A CN114704845A CN202210302860.5A CN202210302860A CN114704845A CN 114704845 A CN114704845 A CN 114704845A CN 202210302860 A CN202210302860 A CN 202210302860A CN 114704845 A CN114704845 A CN 114704845A
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- slag
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- temperature sensor
- air leakage
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- 239000002893 slag Substances 0.000 title claims abstract description 104
- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000007599 discharging Methods 0.000 title claims description 13
- 230000005540 biological transmission Effects 0.000 claims abstract description 30
- 238000001035 drying Methods 0.000 claims abstract description 24
- 238000001816 cooling Methods 0.000 claims abstract description 21
- 238000012545 processing Methods 0.000 claims abstract description 14
- 230000007246 mechanism Effects 0.000 claims abstract description 13
- 239000013049 sediment Substances 0.000 description 11
- 238000013461 design Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J1/00—Removing ash, clinker, or slag from combustion chambers
- F23J1/02—Apparatus for removing ash, clinker, or slag from ash-pits, e.g. by employing trucks or conveyors, by employing suction devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J1/00—Removing ash, clinker, or slag from combustion chambers
- F23J1/06—Mechanically-operated devices, e.g. clinker pushers
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
- Gasification And Melting Of Waste (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a high-efficiency heat exchange low-air-leakage-rate automatic dry slag discharge control system and a method, wherein each guide device is respectively arranged on an upper top cover of a dry slag machine, each guide device is provided with a guide device baffle, and all guide devices are divided into a plurality of groups, wherein one group of guide devices correspond to one set of link mechanism and one set of transmission device, and each guide device in each group of guide devices is connected with the corresponding transmission device through the corresponding link mechanism; the inlet temperature sensor, the outlet temperature sensor and the transmission device are connected with the central processing unit, and the system and the method can solve the problem of poor heat exchange capability caused by long distance between a large amount of cooling air and hot slag on the upper part of the slag drying machine.
Description
Technical Field
The invention relates to an automatic control system and method for dry slag discharge, in particular to an automatic control system and method for dry slag discharge with high-efficiency heat exchange and low air leakage rate.
Background
Too high air leakage rate of the slag drying machine can reduce the combustion economy and stable combustion characteristic of the boiler. On the one hand, limited by dry sediment machine slag discharge ability and dry sediment machine structural feature, the upper portion circulation of air space of dry sediment machine design is great usually, in order to satisfy cooling slag temperature needs simultaneously, must improve certain dry sediment machine air leakage rate, and the cooling air is more the circulation of pasting dry sediment machine upper portion, and is far away relatively with hot row sediment distance, can't realize more high-efficient heat transfer, and this just leads to present dry sediment machine air leakage rate big, and heat transfer performance is poor. On the other hand, the design of the slag drying machine is designed according to the highest output of the boiler, the lowest load and the highest load of the boiler frequently fluctuate in the actual operation process of the boiler, but the operation state of the slag drying machine is basically kept unchanged, especially under the working condition of medium and low load, the air leakage rate of the slag drying machine is higher, the proportion of cold air discharged into the boiler is higher, the distance between a large amount of cooling air at the upper part and hot slag is farther, and the heat exchange performance is poorer. In order to reduce the air leakage rate of the dry slag machine, the traditional approach can only be realized by simply reducing the air leakage rate of the dry slag machine, the method has limited air leakage rate of dry slag discharge, and does not fundamentally solve the fundamental problem that the heat exchange capacity of a large amount of cooling air at the upper part of the dry slag machine is poor due to a long distance between the cooling air and hot slag.
At present, the automatic control system for the dry slag discharging with high-efficiency heat exchange and low air leakage rate has no popularization significance.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an automatic dry slag discharge control system and method with high heat exchange efficiency and low air leakage rate, and the system and method can solve the problem of poor heat exchange capability caused by long distance between a large amount of cooling air and hot slag on the upper part of a slag dryer.
In order to achieve the aim, the automatic dry slag discharge control system with high heat exchange efficiency and low air leakage rate comprises a central processing unit, a plurality of guide devices, a plurality of link mechanisms, a plurality of transmission devices, an inlet temperature sensor for detecting the initial temperature of hot slag and an outlet temperature sensor for detecting the outlet temperature of the hot slag;
each guiding device is arranged on the top cover of the slag drying machine, each guiding device is provided with a guiding device baffle, and all guiding devices are divided into a plurality of groups, wherein one group of guiding devices corresponds to one set of link mechanism and one set of transmission device, and each guiding device in each group of guiding devices is connected with the corresponding transmission device through the corresponding link mechanism;
the inlet temperature sensor, the outlet temperature sensor and the transmission device are connected with the central processing unit.
The inlet temperature sensor is positioned between the top cover of the slag drying machine at the outlet of the cold ash bucket and the upper edge of the slag conveying belt.
The outlet temperature sensor is positioned between the upper top cover of the slag drying machine at the outlet of the slag drying machine and the upper edge of the slag conveying belt.
The central processor is connected with the inlet temperature sensor, the outlet temperature sensor and the transmission device through data transmission lines.
The bottom surface of the baffle of the guiding device is of an inwards concave rectangular structure.
The invention relates to a dry slag discharging automatic control method with high-efficiency heat exchange and low air leakage rate, which comprises the following steps:
the central processing unit detects the initial temperature of the hot slag through the inlet temperature sensor, detects the outlet temperature of the hot slag through the outlet temperature sensor, simultaneously acquires the boiler load information, evaluates the cooling demand of the current slag drying machine according to the initial temperature of the hot slag, the outlet temperature of the hot slag and the boiler load information, determines the adjusting scheme of the guide device baffle according to the cooling demand of the current slag drying machine and the preset locating point relation curve of the guide device baffle, adjusts the guide device baffle through the transmission device according to the adjusting scheme of the guide device baffle, and realizes the positioning of the locating points of the guide device baffle.
In the automatic mode, the central processor automatically adjusts the baffle of the guiding device through the transmission device according to the adjustment scheme of the baffle of the guiding device.
In the manual mode, the central processing unit supplies the adjustment scheme of the baffle of the guiding device to an operator for reference of the operator, and then adjusts the baffle of the guiding device through the transmission device according to an instruction manually input by the operator.
The invention has the following beneficial effects:
according to the automatic dry slag discharging control system and method with high-efficiency heat exchange and low air leakage rate, during specific operation, the plurality of guide device baffles are added in the original dry slag discharging system, so that cold air is guided to be close to hot slag on the premise of not influencing normal slag discharging, cooling is more efficient, the required cooling air quantity is less, and the problem of poor heat exchange capacity caused by the fact that a large amount of cooling air at the upper part of the dry slag machine is far away from the hot slag is solved. It should be noted that, on the premise of not influencing the output of the original slag dryer, the invention can realize the automatic control and adjustment of the slag dryer with more efficient heat exchange and lower air leakage rate, and can position the baffle of the guiding device in real time according to the parameters such as boiler load, slag discharge quantity, slag discharge inlet and outlet temperature, and the like, wherein, the positioning angle determines the air leakage quantity and the cooling effect of the slag dryer, the cooling effect is the worst in the horizontal position, the air leakage rate is the highest, the performance is equal to that of the original slag dryer system, the cooling effect is the best in the vertical position, and the air leakage rate is the lowest.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Wherein, 1 is a cold ash bucket, 2 is an inlet temperature sensor, 3 is a central processing unit, 4 is an upper top cover of a slag drying machine, 5 is a data transmission line, 6 is a link mechanism, 7 is an upper edge of a slag conveying belt, 8 is a guide device, 9 is a transmission device, 10 is an outlet temperature sensor, and 11 is a guide device baffle plate.
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 automatic control system for dry slag removal with high heat exchange efficiency and low air leakage rate comprises a central processing unit 3, a plurality of guiding devices 8, a plurality of link mechanisms 6, a plurality of transmission devices 9, an inlet temperature sensor 2 for detecting the initial temperature of hot slag, and an outlet temperature sensor 10 for detecting the outlet temperature of hot slag;
the inlet temperature sensor 2 is positioned between the upper top cover 4 of the slag drying machine at the outlet of the cold ash bucket 1 and the upper edge 7 of the slag conveying belt, and the outlet temperature sensor 10 is positioned between the upper top cover 4 of the slag drying machine at the outlet of the slag drying machine and the upper edge 7 of the slag conveying belt.
Each guiding device 8 is respectively arranged on the upper top cover 4 of the slag drying machine, each guiding device 8 is provided with a guiding device baffle 11, all guiding devices 8 are divided into a plurality of groups, wherein each guiding device 8 in the same group is adjacent, and one group of guiding devices 8 correspond to one set of link mechanism 6 and one set of transmission device 9, each guiding device 8 in each group of guiding devices 8 is connected with the corresponding transmission device 9 through the corresponding link mechanism 6, and one group of guiding devices 8, the corresponding link mechanism 6 and the corresponding transmission device 9 form an adjusting unit;
the guide device baffle 11 can be flexibly overturned between the positioning point and the horizontal position along the one-way direction of the slag conveying direction, meanwhile, the guide device baffle 11 cannot be overturned towards the reverse direction behind the positioning point, the guide device baffle 11 is designed into a rectangular structure with an inwards concave bottom edge according to the structure of a slag drying machine, the thickness and the material are designed according to the internal cooling air speed and the maximum slag amount of a boiler, the guide device baffle 11 can maintain certain stability through self weight, and meanwhile, the guide device baffle 11 can be smoothly pushed away by large-sized slag blocks.
The inlet temperature sensor 2, the outlet temperature sensor 10, the guiding device 8 and the transmission device 9 are all connected with the central processor 3 through data transmission lines 5.
The invention relates to a high-efficiency heat exchange low-air-leakage-rate dry slag discharging automatic control method which comprises the following steps:
the central processing unit 3 collects the boiler load and the data acquired by the inlet temperature sensor 2 and the outlet temperature sensor 10 in real time, evaluates the cooling demand of the current slag drying machine, and controls the transmission device 9 in each adjusting unit according to the cooling demand of the current slag drying machine and the preset positioning point relation curve of the guide device baffle plates 11 in each adjusting unit so as to adjust the guide device baffle plates 11 in each adjusting unit and realize the positioning of the positioning points of the guide device baffle plates 11.
Wherein, the positioning point of the baffle 11 of the guiding device is positioned and adjusted by the guiding device 8.
After 11 locating points of guider baffle are positioned, when no slag block contacts the guider baffle 11, then the relative position of the guider baffle 11 is fixed, when a large slag block contacts the guider baffle 11, the contacted guider baffle 11 is flexibly overturned towards the slag conveying direction under the pushing of the large slag block, after the large slag block passes through the guider baffle 11, the guider baffle 11 is restored to the locating point by self weight and cooling air, thereby ensuring normal slag discharge.
In addition, it should be noted that, when the present invention works, an automatic mode or a manual mode may be selected, wherein, in the automatic mode, when the data of the boiler load, the inlet temperature sensor 2, and the outlet temperature sensor 10 collected by the central processing unit 3 in real time are not changed, the system maintains the current state, when the collected data are changed, the system automatically performs real-time adjustment according to the adjustment scheme recommended by the expert system, in the automatic mode, the system has manual intervention capability, and an operator may perform ± offset setting on the adjustment scheme recommended by the expert system according to the data collected by the central processing unit 3 in real time. In the manual mode, the central processing unit 3 collects data of the boiler load, the inlet temperature sensor 2 and the outlet temperature sensor 10 in real time, an adjustment scheme recommended by an expert system is automatically provided for manual adjustment reference of an operator, and the system carries out real-time adjustment according to an instruction input by the operator.
The invention can effectively reduce the air leakage rate of the dry slag machine, improve the actual heat exchange performance of the dry slag machine and simultaneously realize the real-time optimal mode operation of the dry slag machine in the full output range. Under the prerequisite that satisfies dry sediment machine demand of exerting oneself, effectively improve the heat transfer performance of dry sediment machine, reduce the cold wind volume that leaks into cold ash bucket from dry sediment machine, and the system is simple, reform transform low cost, can directly reform transform on the basis of the current dry slag discharging system of power plant, do not have any influence to former dry sediment machine ability of exerting oneself, the transformation cost is lower, is fit for extensively promoting in dry slag discharging system.
Claims (8)
1. A dry slag discharging automatic control system with high-efficiency heat exchange and low air leakage rate is characterized by comprising a central processing unit (3), a plurality of guide devices (8), a plurality of link mechanisms (6), a plurality of transmission devices (9), an inlet temperature sensor (2) for detecting the initial temperature of hot slag and an outlet temperature sensor (10) for detecting the outlet temperature of the hot slag;
each guiding device (8) is respectively arranged on an upper top cover (4) of the slag drying machine, each guiding device (8) is provided with a guiding device baffle (11), all guiding devices (8) are divided into a plurality of groups, wherein one group of guiding devices (8) correspond to one set of link mechanism (6) and one set of transmission device (9), and each guiding device (8) in each group of guiding devices (8) is connected with the corresponding transmission device (9) through the corresponding link mechanism (6);
the inlet temperature sensor (2), the outlet temperature sensor (10) and the transmission device (9) are connected with the central processing unit (3).
2. The automatic dry slag discharge control system with high heat exchange efficiency and low air leakage rate according to claim 1 is characterized in that the inlet temperature sensor (2) is positioned between the upper top cover (4) of the dry slag machine at the outlet of the cold ash hopper (1) and the upper edge (7) of the slag conveying belt.
3. The automatic dry slag discharge control system with high heat exchange efficiency and low air leakage rate according to claim 1, characterized in that the outlet temperature sensor (10) is positioned between the upper top cover (4) of the slag drying machine at the outlet of the slag drying machine and the upper edge (7) of the slag conveying belt.
4. The automatic dry slag discharge control system with high heat exchange efficiency and low air leakage rate as claimed in claim 1, characterized in that the central processor (3) is connected with the inlet temperature sensor (2), the outlet temperature sensor (10) and the transmission device (9) through data transmission lines (5).
5. The automatic dry slag discharge control system with high heat exchange efficiency and low air leakage rate as claimed in claim 1, characterized in that the bottom surface of the baffle (11) of the guide device is of an inwards concave rectangular structure.
6. The automatic control method of the dry slag discharging with high heat exchange efficiency and low air leakage rate is characterized in that the automatic control system of the dry slag discharging with high heat exchange efficiency and low air leakage rate based on the claim 1 comprises the following steps:
the central processing unit (3) detects the initial temperature of the hot slag through the inlet temperature sensor (2), detects the outlet temperature of the hot slag through the outlet temperature sensor (10), simultaneously acquires the boiler load information, evaluates the cooling demand of the current slag drying machine according to the initial temperature of the hot slag, the outlet temperature of the hot slag and the boiler load information, determines the adjusting scheme of the guide device baffle (11) according to the cooling demand of the current slag drying machine and the locating point relation curve of the preset guide device baffle (11), adjusts the guide device baffle (11) through the transmission device (9) according to the adjusting scheme of the guide device baffle (11), and realizes the locating point positioning of each guide device baffle (11).
7. The automatic control method of dry slag discharge with high heat exchange efficiency and low air leakage rate according to claim 6, characterized in that, in the automatic mode, the CPU (3) automatically adjusts the baffle (11) of the guiding device through the transmission device (9) according to the adjustment scheme of the baffle (11) of the guiding device.
8. The automatic control method for dry slag discharge with low air leakage rate and high efficiency in heat exchange according to claim 6 is characterized in that in manual mode, the CPU (3) provides the operator with the adjustment scheme of the baffle (11) of the guide device for reference, and then adjusts the baffle (11) of the guide device through the transmission device (9) according to the instruction manually input by the operator.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210302860.5A CN114704845A (en) | 2022-03-25 | 2022-03-25 | Dry slag discharging automatic control system and method with high-efficiency heat exchange and low air leakage rate |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210302860.5A CN114704845A (en) | 2022-03-25 | 2022-03-25 | Dry slag discharging automatic control system and method with high-efficiency heat exchange and low air leakage rate |
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| CN114704845A true CN114704845A (en) | 2022-07-05 |
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| CN202210302860.5A Pending CN114704845A (en) | 2022-03-25 | 2022-03-25 | Dry slag discharging automatic control system and method with high-efficiency heat exchange and low air leakage rate |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116398898A (en) * | 2023-03-09 | 2023-07-07 | 国家能源集团科学技术研究院有限公司 | Method and device for adjusting air inlet quantity of boiler bottom |
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| EP0931981A2 (en) * | 1998-01-15 | 1999-07-28 | Magaldi Ricerche E Brevetti S.R.L. | Apparatus and method for postcombustion of heavy ash with high contents of unburnt matter |
| AU2006203642A1 (en) * | 2006-01-24 | 2007-08-09 | Beijing Guodian Futong Science And Technology Development Co. Ltd | Dry slag discharge device for coal-fired boiler |
| US20110308435A1 (en) * | 2010-06-16 | 2011-12-22 | Clyde Bergemann Drycon Gmbh | Conveying means and method for conveying hot material |
| CN202792059U (en) * | 2012-07-28 | 2013-03-13 | 青岛达能环保设备股份有限公司 | Multilevel air-cooled dry slag device |
| CN103939924A (en) * | 2014-03-05 | 2014-07-23 | 北京国电富通科技发展有限责任公司 | Intelligent control system for dry slag cooling air amount |
| CN210035543U (en) * | 2019-05-13 | 2020-02-07 | 东源曲靖能源有限公司 | Slag dragging machine provided with large slag switch device |
-
2022
- 2022-03-25 CN CN202210302860.5A patent/CN114704845A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0931981A2 (en) * | 1998-01-15 | 1999-07-28 | Magaldi Ricerche E Brevetti S.R.L. | Apparatus and method for postcombustion of heavy ash with high contents of unburnt matter |
| AU2006203642A1 (en) * | 2006-01-24 | 2007-08-09 | Beijing Guodian Futong Science And Technology Development Co. Ltd | Dry slag discharge device for coal-fired boiler |
| US20110308435A1 (en) * | 2010-06-16 | 2011-12-22 | Clyde Bergemann Drycon Gmbh | Conveying means and method for conveying hot material |
| CN202792059U (en) * | 2012-07-28 | 2013-03-13 | 青岛达能环保设备股份有限公司 | Multilevel air-cooled dry slag device |
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| CN210035543U (en) * | 2019-05-13 | 2020-02-07 | 东源曲靖能源有限公司 | Slag dragging machine provided with large slag switch device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116398898A (en) * | 2023-03-09 | 2023-07-07 | 国家能源集团科学技术研究院有限公司 | Method and device for adjusting air inlet quantity of boiler bottom |
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