CN112325280B - CFB boiler feed inlet anti-coking device - Google Patents
CFB boiler feed inlet anti-coking device Download PDFInfo
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- CN112325280B CN112325280B CN202011179842.XA CN202011179842A CN112325280B CN 112325280 B CN112325280 B CN 112325280B CN 202011179842 A CN202011179842 A CN 202011179842A CN 112325280 B CN112325280 B CN 112325280B
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- air
- temperature
- pipeline
- heat exchange
- control valve
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C10/00—Fluidised bed combustion apparatus
- F23C10/18—Details; Accessories
- F23C10/22—Fuel feeders specially adapted for fluidised bed combustion apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C10/00—Fluidised bed combustion apparatus
- F23C10/18—Details; Accessories
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C10/00—Fluidised bed combustion apparatus
- F23C10/18—Details; Accessories
- F23C10/28—Control devices specially adapted for fluidised bed, combustion apparatus
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Abstract
The invention discloses a CFB boiler feed inlet anti-coking device, which comprises: the feeding port is arranged on the hearth wall of the CFB boiler and is used for feeding fuel; the air box is arranged below the feeding port and used for cooling the feeding port, the air box comprises an air inlet and an air outlet, the air outlet is communicated with the outer wall of the hearth, the air box is further connected with two pipelines of cold air and hot air controlled by an electric butterfly valve, the temperature of a corresponding area is collected and selected by a temperature numerical selector, and the PID operation regulating system controls the electromagnetic valve according to the selected temperature, so that the switching function of cold air and hot air is realized, and the temperature can be kept within a certain range. The invention can avoid the aggregation of particles near the feeding port, realize the coking prevention effect near the feeding port and improve the combustion condition of the dense-phase region of the hearth.
Description
Technical Field
The invention relates to the technical field of combustion boilers, in particular to an anti-coking device for a feed inlet of a CFB boiler.
Background
The circulating fluidized bed technology is an efficient and clean combustion technology developed in the last decades, is widely used in the fields of power station boilers, industrial boilers, waste treatment and utilization and the like with excellent load performance and wide fuel adaptability, and is utilized in the energy structure of China to occupy a considerable proportion. In the prior art, a CFB boiler adopts a wall-attached feeding port (CFB: circulating fluidized bed, circulating fluidized bed), but the feeding of the feeding port is concentrated at the furnace wall part to form a first coking zone, so that the concentrated temperature of the front material of the side of the feeding port is higher, and coking is easy. Later, people stretch into the feed inlet and put than the intermediate position in the stove, although solved the higher problem of first coking zone temperature, but because this kind of feed inlet can send into the intermediate position in the stove with the material, make the material distribute more even, but because of the intermediate temperature of stove is high, the easy coking of feed inlet itself forms the second coking zone.
Disclosure of Invention
The invention aims to provide an anti-coking device for a boiler, which can prevent the boiler from coking at the corresponding position of a feeding port accessory when the boiler is fed, thereby ensuring the normal work of feeding.
In order to achieve the above purpose, the invention provides a CFB boiler feed inlet anti-coking device, comprising:
the feeding port is arranged on the hearth wall of the CFB boiler and is used for feeding furnace fuel;
the air box is arranged below the feeding port and used for cooling the feeding port;
the air box comprises an air inlet and an air outlet, and the air outlet is communicated with the outer wall of the hearth.
Preferably, the air box is divided into an air inlet cavity and a heat exchange cavity through a flow equalizing plate, the upper heat exchange surface of the heat exchange cavity is the lower surface of the feeding port, the front heat exchange surface of the heat exchange cavity is a heat exchange furnace wall, the heat exchange furnace wall is a part of a hearth wall, and a plurality of through holes are formed in the heat exchange furnace wall.
Preferably, the flow equalizing plate is provided with a plurality of flow guiding holes, and the inner diameters of the flow guiding holes are sequentially increased from top to bottom along the vertical direction of the flow equalizing plate.
The air inlet of the air box is communicated with the air outlet of the fan through a first pipeline, a first control valve is further arranged between the air box and the fan, and the first control valve is used for controlling the flow of the first pipeline gas.
The air inlet of the bellows is further provided with a second pipeline, the second pipeline is communicated with the air inlet of the bellows through a second control valve, and the second electric valve is used for controlling the flow of second pipeline gas.
The first pipeline is a cold air pipeline, the second pipeline is a hot secondary air pipeline, and the first pipeline is arranged above the second pipeline.
The feeding port is provided with a first temperature sensor, the inner side of the heat exchange furnace wall is provided with a second temperature sensor, the first temperature sensor and the second temperature sensor are respectively connected with the input end of a temperature numerical value selector, the output end of the temperature numerical value selector is connected with the input end of a PID controller, the first control end of the PID controller is connected with the first electric valve, and the second control end of the PID controller is connected with the second electric valve; the first temperature sensor and the second temperature sensor respectively output collected temperatures T1 and T2 to the temperature value selector, the temperature value selector selects the maximum temperature and outputs the maximum temperature to the PID controller, and the PID controller calculates the maximum temperature and adjusts the first electric valve and/or the second electric valve.
Preferably, the temperature sensor, the first temperature sensor and the second temperature sensor are all thermocouple temperature measuring devices. The temperature numerical value selector is a temperature selector.
Preferably, the first control valve and the second control valve are electric butterfly valves, and sealing filler is filled at the rotating shaft of each electric butterfly valve.
Compared with the prior art, the invention has the following technical effects:
according to the CFB boiler feed port anti-coking device, the feed port and the boiler dense-phase area can be monitored in real time according to the first temperature sensor and the second temperature sensor, and the two electric butterfly valves are regulated by controlling the temperature in real time through the PID operation regulator and the temperature numerical value selector, so that the anti-coking effect of the feed port is realized, the aggregation of particles near the feed port can be avoided, the combustion condition of the hearth dense-phase area is improved, and the accuracy of the whole anti-coking control is ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a block diagram of an anti-coking and combustion improving device of a circulating fluidized bed boiler according to an embodiment of the present invention;
FIG. 2 is an enlarged schematic view of portion A of FIG. 1;
FIG. 3 is a schematic cross-sectional view of B-B in FIG. 2;
FIG. 4 is a schematic diagram of a temperature control structure;
the device comprises a 1-feeding port, a 2-bellows, a 3-hot secondary air channel, a 4-flow equalizing plate, a 5-second electric butterfly valve, a 6-first electric butterfly valve, a 7-cold air channel, an 8-fan, a 9-first thermocouple temperature measuring device, a 10-second thermocouple temperature measuring device, a 11-temperature value selector, a 12-PID operation regulating system, a 13-hearth wall, a 14-hearth, a 15-hearth outlet, a 16-cyclone separator and a 17-feed back port.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention aims to provide an anti-coking device for a boiler, which solves the problem of coking at the corresponding position of a feeding port in the prior art, avoids the phenomenon of accumulation and aggregation of combustion particles near the feeding port, and is beneficial to improving combustion of a combustion object in a dense-phase region of a hearth.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
As shown in fig. 1 to 4, the present embodiment provides a CFB boiler feed port anti-coking device, including: the device comprises a feeding port 1, a wind box 2, a hot secondary wind channel 3, a flow equalizing plate 4, a second electric butterfly valve 5, a first electric butterfly valve 6, a cold wind pipeline 7, a fan 8, a first thermocouple temperature measuring device 9, a second thermocouple temperature measuring device 10, a temperature value selector 11, a PID operation regulating system 12, a furnace wall 13, a furnace 14, a furnace outlet 15, a cyclone separator 16 and a feed back port 17.
The feeding port 1 of the embodiment is arranged on a hearth wall 13 of the CFB boiler and is used for feeding fuel; a bellows 2 disposed below the feed port 1 for cooling the feed port 1; the bellows 2 further comprises an air inlet and an air outlet, the air outlet of the bellows being in communication with the furnace 14. The bellows 2 is also internally provided with a flow equalizing plate 4, the flow equalizing plate 4 is provided with a plurality of flow guide holes, the inner diameters of the flow guide holes are sequentially increased from top to bottom along the vertical direction, and the bellows 2 is divided into an air inlet cavity and a heat exchange cavity by the flow equalizing plate 4. The upper heat exchange surface of the heat exchange cavity is the lower surface of the feeding port 1, the front heat exchange surface of the heat exchange cavity is a part of a hearth wall 13, which is called a heat exchange furnace wall, and a plurality of through holes are formed in the heat exchange furnace wall.
The two pipelines comprise two pipelines, wherein the first pipeline is a cold air pipeline 7, the second pipeline is a hot secondary air pipeline 3, and the cold air pipeline 7 is arranged above the hot secondary air pipeline 3. The air intake of bellows 2 passes through cold air duct 7 and the air outlet intercommunication of fan 8, bellows 2 with still be provided with first electric butterfly valve 6 between the fan 8, first electric butterfly valve 6 is used for controlling the gaseous flow of cold air duct 7. The hot secondary air channel 3 is communicated with the air box 2 through a second electric butterfly valve 5, and the second electric butterfly valve 5 is used for controlling the flow of gas in the hot secondary air channel 3.
The feeding port 1 is also provided with a first thermocouple temperature measuring device 9, and the inner side of the heat exchange furnace wall is also provided with a second thermocouple temperature measuring device 10, and the second thermocouple temperature measuring devices are respectively connected with the input end of the temperature value selector 11. The temperature value selector in this embodiment is optional, as long as it has an automatic high selection function, and specifically, the model of the temperature value selector in this embodiment is a signal selector of YR 9033A. The output end of the temperature value selector 11 is connected with the input end of the PID operation adjusting system 11, a first control end of the PID operation adjusting system 11 is connected with the first electric butterfly valve 6, and a second control end of the PID operation adjusting system 11 is connected with the second electric butterfly valve 5. The first thermocouple temperature measuring device 9 and the second thermocouple temperature measuring device 10 output the collected temperatures T1 and T2 to the temperature value selector 11, respectively, the temperature value selector 11 selects the maximum temperature and outputs the maximum temperature to the PID operation adjusting system 12, and the PID operation adjusting system 11 calculates and adjusts the first electric butterfly valve 6 and/or the second electric butterfly valve 5 by calculating the inputted maximum temperature. And the actuating mechanisms of the first electric butterfly valve 6 and the second electric butterfly valve 5 and the first thermocouple temperature measuring device and the second thermocouple temperature measuring device form a linkage arrangement.
When the boiler is operating normally, the first thermocouple temperature measuring device 9 and the second thermocouple temperature measuring device 10 will monitor in real time and input the measured temperature signals into the temperature value selector 11. At this time, the temperature value selector 11 outputs the highest temperature T value selected to the PID operation adjustment system 12, and the PID operation adjustment system 12 starts to operate the input temperature T value and 300 ℃ and 600 ℃ set in the PID operation adjustment system 12 and adjusts the first electric butterfly valve 6 and the second electric butterfly valve 5. When the input temperature T is higher than 600 ℃, the control end of the PID operation regulating system 12 controls the second electric butterfly valve 5 to perform closing operation, and simultaneously the first electric butterfly valve 6 performs opening operation. At this time, the blower 8 is operated, and the wind pressure is controlled to be 7000 to 10000pa, so that the wind speed of the wind box 2 is maintained at 10m/s. This realizes the cooling operation of the feed port 1. When the input temperature T is less than 300 ℃, the control end of the PID operation regulator 12 controls the first electric butterfly valve 6 to perform the closing operation, and simultaneously the second electric butterfly valve 5 performs the opening operation. At this time, the hot secondary air duct 3 was blown with hot air, and the wind speed of the wind box 2 was maintained at 10m/s. This achieves a dense phase zone heating operation for the boiler.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the system disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.
The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to assist in understanding the methods of the present invention and the core ideas thereof; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.
Claims (6)
1. A CFB boiler feed port anti-coking device, comprising:
the feeding port is arranged on the hearth wall of the CFB boiler and is used for feeding furnace fuel;
the air box is arranged below the feeding port and used for cooling the feeding port;
the air box comprises an air inlet and an air outlet, and the air outlet is communicated with the outer wall of the hearth;
the air inlet of the air box is communicated with the air outlet of the fan through a first pipeline, a first control valve is further arranged between the air box and the fan, and the first control valve is used for controlling the flow of the first pipeline gas;
the air inlet of the air box is also provided with a second pipeline, the second pipeline is communicated with the air inlet of the air box through a second control valve, and the second control valve is used for controlling the flow of second pipeline gas;
the first pipeline is a cold air pipeline, and the second pipeline is a hot secondary air pipeline;
the air box is divided into an air inlet cavity and a heat exchange cavity through a flow equalizing plate, the upper heat exchange surface of the heat exchange cavity is the lower surface of the feeding port, the front heat exchange surface of the heat exchange cavity is a heat exchange furnace wall, and the heat exchange furnace wall is a part of the hearth wall;
the feeding port is provided with a first temperature sensor, the inner side of the heat exchange furnace wall is provided with a second temperature sensor, the first temperature sensor and the second temperature sensor are respectively connected with the input end of a temperature numerical value selector, the output end of the temperature numerical value selector is connected with the input end of a PID controller, the first control end of the PID controller is connected with the first control valve, and the second control end of the PID controller is connected with the second control valve;
the first temperature sensor and the second temperature sensor respectively output collected temperatures T1 and T2 to the temperature value selector, the temperature value selector selects the maximum temperature and outputs the maximum temperature to the PID controller, and the PID controller calculates the maximum temperature and adjusts the first control valve and/or the second control valve.
2. The CFB boiler feed port anti-coking device of claim 1, wherein the heat exchange furnace wall is provided with a plurality of through holes.
3. The CFB boiler feed port anti-coking device according to claim 2, wherein the flow equalizing plate is provided with a plurality of flow guide holes, and the inner diameters of the flow guide holes are sequentially increased from top to bottom along the vertical direction of the flow equalizing plate.
4. The CFB boiler feed port coking-preventing apparatus of claim 1,
the first pipeline is arranged above the second pipeline.
5. The CFB boiler feed port anti-coking device of claim 4, wherein the first temperature sensor and the second temperature sensor are thermocouple temperature measuring devices.
6. The CFB boiler feed port anti-coking device of claim 5, wherein the first control valve and the second control valve are electric butterfly valves, and sealing filler is filled at the rotating shaft of the electric butterfly valves.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011179842.XA CN112325280B (en) | 2020-10-29 | 2020-10-29 | CFB boiler feed inlet anti-coking device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011179842.XA CN112325280B (en) | 2020-10-29 | 2020-10-29 | CFB boiler feed inlet anti-coking device |
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| CN112325280A CN112325280A (en) | 2021-02-05 |
| CN112325280B true CN112325280B (en) | 2023-06-16 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5567919A (en) * | 1993-12-22 | 1996-10-22 | Combustion Engineering, Inc. | Gravimetric feeding system for boiler fuel and sorbent |
| CN205447719U (en) * | 2015-12-14 | 2016-08-10 | 广东龙正节能环保科技有限公司 | Biomass boiler of anti -coking |
| CN208418708U (en) * | 2018-07-05 | 2019-01-22 | 中国电力工程顾问集团华北电力设计院有限公司 | Hot-flow flue banking fire explosion protection system of CFB boiler |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3106531A1 (en) * | 2015-06-15 | 2016-12-21 | Improbed AB | Use of pre-oxidized ilmenite in fluidized bed boilers |
| CN205174352U (en) * | 2015-11-23 | 2016-04-20 | 浙江春晖环保能源有限公司 | Prevention coking device of circulating fluidized bed boiler |
| CN205782887U (en) * | 2016-06-07 | 2016-12-07 | 郑州锅炉股份有限公司 | A kind of air-cushion type coal sorting feeder |
| CN205957163U (en) * | 2016-07-05 | 2017-02-15 | 太原锅炉集团有限公司 | Abrasionproof coal feeding device of circulating fluidized bed boiler |
| CN205939115U (en) * | 2016-08-30 | 2017-02-08 | 福建省联盛纸业有限责任公司 | High -efficient circulating fluidized bed boiler of papermaking |
| CN107906533A (en) * | 2017-12-22 | 2018-04-13 | 杭州海陆重工有限公司 | Fluidisation charging gear for fluidized-bed combustion boiler |
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2020
- 2020-10-29 CN CN202011179842.XA patent/CN112325280B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5567919A (en) * | 1993-12-22 | 1996-10-22 | Combustion Engineering, Inc. | Gravimetric feeding system for boiler fuel and sorbent |
| CN205447719U (en) * | 2015-12-14 | 2016-08-10 | 广东龙正节能环保科技有限公司 | Biomass boiler of anti -coking |
| CN208418708U (en) * | 2018-07-05 | 2019-01-22 | 中国电力工程顾问集团华北电力设计院有限公司 | Hot-flow flue banking fire explosion protection system of CFB boiler |
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