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WO2025156512A1 - Appareil d'élimination de poussière pour bac à scories de séchoir à scories pour centrale thermique et procédé d'élimination de poussière associé - Google Patents

Appareil d'élimination de poussière pour bac à scories de séchoir à scories pour centrale thermique et procédé d'élimination de poussière associé

Info

Publication number
WO2025156512A1
WO2025156512A1 PCT/CN2024/093242 CN2024093242W WO2025156512A1 WO 2025156512 A1 WO2025156512 A1 WO 2025156512A1 CN 2024093242 W CN2024093242 W CN 2024093242W WO 2025156512 A1 WO2025156512 A1 WO 2025156512A1
Authority
WO
WIPO (PCT)
Prior art keywords
slag
dust
dust collecting
air
collecting hood
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/CN2024/093242
Other languages
English (en)
Chinese (zh)
Inventor
王晓乾
张海龙
王东培
乔越
党小建
杨明强
张志博
骆贵兵
任建永
马东森
蔺建波
孙式洋
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Xian Thermal Power Research Institute Co Ltd
Huaneng Laiwu Power Generation Co Ltd
Original Assignee
Xian Thermal Power Research Institute Co Ltd
Huaneng Laiwu Power Generation Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Xian Thermal Power Research Institute Co Ltd, Huaneng Laiwu Power Generation Co Ltd filed Critical Xian Thermal Power Research Institute Co Ltd
Publication of WO2025156512A1 publication Critical patent/WO2025156512A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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

Definitions

  • the present application belongs to the technical field of pollutant treatment in thermal power plants, and specifically relates to a dust removal device for a slag bin of a dry slag machine in a thermal power plant and a dust removal method thereof.
  • slag removal is mostly done using air-cooled dry slag removal.
  • Each boiler is typically equipped with a dry slag removal system consisting of an air-cooled steel belt conveyor, a slag crusher, and two bucket elevators, which convey the slag directly to a slag bin.
  • Two slag discharge ports are located at the bottom of the slag bin, allowing for either dry or wet slag discharge, depending on the application.
  • the main method is to add negative pressure dust suction at the slag discharge port and send the dust-laden gas to the bag dust collector. The dust is collected by the bag dust collector and then disposed of in a unified manner.
  • the purpose of this application is to address the problems in the above-mentioned prior art and provide a slag bin dust removal device and a dust removal method for a thermal power plant dry slag machine, which utilizes the negative pressure of the furnace to absorb dust and can adapt to the working conditions of discharging dry slag and wet slag from the slag bin at the same time. It has strong adaptability to seasons and regions and has a better dust removal effect.
  • a dust removal device for a slag bin of a slag dryer in a thermal power plant comprising a dust collecting hood mounted on a slag discharge port of the slag bin, the dust collecting hood being connected to a horizontal section of an air-cooled slag dryer via a pipeline, and utilizing the negative pressure generated by the horizontal section of the air-cooled slag dryer to provide the dust collecting hood with the suction force required for dust collection;
  • the dust-laden gas collected by the dust hood is used as cooling air for the air-cooled slag dryer and is sent into the furnace after cooling the slag on the conveyor belt.
  • a pipe regulating valve is installed on the pipe. When unloading slag from the slag bin, the air volume of the dust hood is adjusted by adjusting the opening of the pipe regulating valve according to the unloading amount and dust situation.
  • the dust hood is a gradually expanding umbrella-shaped structure, and the end of the dust hood with a smaller diameter is connected to the slag discharge port of the slag bin; the pipe is inserted into the interior of the dust hood from the side of the dust hood and connected to the horizontal section of the air-cooled dry slag machine.
  • the dust hood is respectively provided with a first dust hood exhaust port, a second dust hood exhaust port, a slag bin dry exhaust port and a slag bin wet exhaust port on the end face connected to the slag bin discharge port; the first dust hood exhaust port and the second dust hood exhaust port are symmetrically arranged on both sides of the line connecting the slag bin dry exhaust port and the slag bin wet exhaust port.
  • an electric telescopic opening is provided at one end of the dust collecting hood with a larger diameter, and the distance between the dust collecting hood outlet and the slag transport vehicle is adjusted by the electric telescopic opening.
  • the inner walls of the dust collecting hood and the pipeline are sprayed with ceramic materials that are wear-resistant and corrosion-resistant.
  • the air-cooled slag dryer is provided with a head air volume regulating door at the head of the conveyor belt.
  • a thermal logic interlock is provided between the head air volume regulating door and the pipeline regulating door. The thermal logic interlock is used to achieve:
  • the head air volume regulating valve is adjusted according to the total air volume required by the air-cooled dry slag machine including the air volume required by the dust collecting hood, so that the total air volume required by the air-cooled dry slag machine including the air volume required by the dust collecting hood does not exceed 1% of the total air volume of the boiler combustion.
  • a method for removing dust from a slag bin of a slag dryer in a thermal power plant comprises the following steps:
  • a dust collecting hood is installed on the slag discharge port of the slag bin, and the dust collecting hood is connected to the horizontal section of the air-cooled slag dryer through a pipeline.
  • the horizontal section of the air-cooled slag dryer is used to provide negative pressure for the dust collecting hood, and the dust collecting hood collects dust under the action of the negative pressure;
  • the dust-laden gas collected by the dust hood is used as cooling air for the air-cooled slag dryer and is sent into the furnace after cooling the slag on the conveyor belt.
  • the head air volume regulating door of the air-cooled slag dryer is linked to the pipe regulating door through thermal logic interlocking.
  • the air volume required by the dust collector is deducted from the total air volume required by the air-cooled slag dryer to obtain the air volume required by the air-cooled slag dryer at the head of the conveyor belt.
  • the opening control instruction of the head air volume regulating door to control the opening of the head air volume regulating door so that the air volume required by the air-cooled slag dryer at the head of the conveyor belt is equal to the total air volume required by the air-cooled slag dryer minus the air volume required by the dust collection hood, so that the total air volume required by the air-cooled slag dryer including the air volume required by the dust collection hood does not exceed 1% of the total air volume of the boiler combustion.
  • the dust hood By installing a dust hood on the slag discharge port of the slag bin, connecting the dust hood to the horizontal section of the air-cooled dry slag machine through a pipe, and utilizing the negative pressure generated by the horizontal section of the air-cooled dry slag machine, the dust hood is provided with the suction force required for dust collection. At the same time, the dust-laden gas collected by the dust hood is used as cooling air for the air-cooled dry slag machine, and is sent into the furnace after cooling the slag on the conveyor belt.
  • the dust removal device proposed in this application utilizes the negative pressure of the furnace itself to complete the dust removal of the slag bin of the dry slag machine, without the need to increase the amount of cold air entering the furnace, and is therefore more energy-efficient.
  • the dust removal device of this application does not require a traditional filter surface such as a bag.
  • the generation of water vapor in the slag bin and the low ambient temperature have no effect on the dust removal process. It can adapt to the working conditions of discharging dry slag and wet slag from the slag bin at the same time, has strong seasonal and regional adaptability, and has a more stable dust removal effect.
  • the structure and dust removal process flow of the dust removal device for the slag bin of the thermal power plant dry slag machine proposed in this application are simple, do not require additional excessive equipment, have low investment costs, and occupy a small area, and have broad application prospects.
  • the air-cooled slag dryer of the present application is provided with a head air volume adjustment door at the head of the conveyor belt, and a thermal logic interlock is provided between the head air volume adjustment door and the pipeline adjustment door.
  • the head air volume adjustment door of the slag dryer can be interlocked and adjusted according to the air supply volume of the dust hood. Through the interlock adjustment, the total air volume required by the air-cooled slag dryer, including the air volume required by the dust hood, is ensured to be no more than 1% of the total air volume of the boiler combustion, thereby avoiding excessive cold air from entering the furnace and affecting the thermal efficiency of the boiler.
  • FIG1 is a schematic structural diagram of a slag bin dust removal device for a thermal power plant dry slag machine according to an embodiment of the present application
  • FIG2 is a schematic diagram of a top view of the dust collecting hood according to an embodiment of the present application.
  • FIG3 is a schematic side view of the dust collecting hood according to an embodiment of the present application.
  • 1-slag pit 2-air-cooled slag dryer; 3-slag bin; 4-dust hood; 5-head air volume adjustment door; 6-pipe adjustment door; 41-first dust hood exhaust outlet; 42-second dust hood exhaust outlet; 43-slag bin dry outlet; 44-slag bin wet outlet.
  • this embodiment of the present application provides a dust removal device for a slag bin of a thermal power plant slag dryer.
  • the device comprises a dust hood 4 mounted on the slag discharge port of the slag bin 3.
  • the hood 4 has a gradually expanding, umbrella-like structure, and the smaller end of the hood 4 is connected to the slag discharge port of the slag bin 3.
  • the hood 4 is connected to the horizontal section of the air-cooled slag dryer 2 via a pipe.
  • a pipe is inserted from the side of the hood 4 into the interior of the hood 4 and connected to the horizontal section of the air-cooled slag dryer 2.
  • the negative pressure generated by the horizontal section of the air-cooled slag dryer 2 provides the suction force required for dust collection in the hood 4.
  • the dust-laden gas collected by the hood 4 serves as cooling air for the air-cooled slag dryer 2 and is delivered to the furnace after cooling the slag on the conveyor belt.
  • a pipe damper 6 is installed on the pipe. When the slag bin 3 is unloaded, the air volume of the hood 4 is adjusted by adjusting the opening of the pipe damper 6 according to the amount of slag discharged and the level of dust emission.
  • the air-cooled slag dryer 2 of the embodiment of the present application is provided with a head air volume adjustment door 5 at the head of the conveyor belt, and a thermal logic interlock is provided between the head air volume adjustment door 5 and the pipeline adjustment door 6.
  • the thermal logic interlock is used to achieve: when the pipeline adjustment door 6 is adjusted to the required air volume according to the dust collecting hood 4, the head air volume adjustment door 5 is adjusted according to the total air volume required by the air-cooled slag dryer 2 including the air volume required by the dust collecting hood 4, so that the total air volume required by the air-cooled slag dryer 2 including the air volume required by the dust collecting hood 4 does not exceed 1% of the total air volume of the boiler combustion, thereby avoiding excessive cold air entering the furnace and affecting the thermal efficiency of the boiler.
  • the dust hood 4 of the present embodiment is provided with a first dust hood exhaust port 41, a second dust hood exhaust port 42, a slag bin dry outlet 43, and a slag bin wet outlet 44 on the end surface thereof connected to the slag bin 3. Furthermore, the first dust hood exhaust port 41 and the second dust hood exhaust port 42 are symmetrically arranged on either side of a line connecting the slag bin dry outlet 43 and the slag bin wet outlet 44.
  • the dust collecting hood 4 of the embodiment of the present application is provided with an electric telescopic opening at one end with a larger diameter, as shown in FIG3 , and the distance between the dust collecting hood outlet and the slag transport vehicle is adjusted by the electric telescopic opening to improve the dust collection efficiency.
  • the dust collecting hood 4 and the inner wall of the pipeline are sprayed with a ceramic material that is wear-resistant and corrosion-resistant to achieve the effect of wear and corrosion resistance.
  • the dust removal device for the slag bin of the thermal power plant dry slag machine proposed in the embodiment of the present application has a simple structure and does not require additional equipment, thus saving investment and space.
  • the dust removal device of the embodiment of the application does not require additional equipment such as Roots blowers, which is more energy-efficient. Since the dust removal device of the embodiment of the application does not have a filter surface in the form of a bag, the generation of water vapor in the slag bin and the low ambient temperature have no effect on the dust removal process, and it has strong adaptability to seasons and regions.
  • the air volume adjustment valve at the head of the dry slag machine of the dust removal device of the embodiment of the application can be interlocked and adjusted according to the air supply volume of the dust collection hood, without increasing the amount of cold air entering the furnace and without affecting the efficiency of the boiler.
  • Another embodiment of the present application further provides a method for removing dust from a slag bin of a dry slag machine in a thermal power plant, comprising the following steps:
  • a dust collecting hood 4 is installed on the slag discharge port of the slag bin 3, and the dust collecting hood 4 is connected to the horizontal section of the air-cooled slag dryer 2 through a pipeline.
  • the horizontal section of the air-cooled slag dryer 2 is used to provide negative pressure for the dust collecting hood 4, and the dust collecting hood 4 collects dust under the action of the negative pressure;
  • the dust-laden gas collected by the dust collecting hood 4 is used as cooling air for the air-cooled slag dryer 2 and is sent into the furnace after cooling the slag on the conveyor belt.
  • the embodiment of the present application associates the head air volume regulating door 5 of the air-cooled slag dryer 2 with the pipeline regulating door 6 through a thermal logic interlock. According to the air volume value obtained by subtracting the air volume required by the dust hood 4 from the total air volume required by the air-cooled slag dryer 2, the air volume value required by the air-cooled slag dryer 2 at the head of the conveyor belt is obtained.
  • the opening control instruction of the head air volume regulating door 5 is output to control the opening of the head air volume regulating door 5 so that the air volume value required by the air-cooled slag dryer 2 at the head of the conveyor belt is equal to the air volume value obtained by subtracting the air volume required by the dust hood 4 from the total air volume required by the air-cooled slag dryer 2, so that the total air volume required by the air-cooled slag dryer 2 including the air volume required by the dust hood 4 does not exceed 1% of the total air volume of the boiler combustion.
  • the dust removal method for the slag bin of a thermal power plant dry slag machine utilizes negative pressure from the furnace to remove dust.
  • This method can accommodate both dry and wet slag discharge from the slag bin. It features a simple process flow, low investment costs, and a small footprint. Dust removal from the dry slag bin is accomplished by utilizing the furnace's own negative pressure, without increasing the amount of cold air entering the furnace, resulting in greater energy savings. Furthermore, the generation of water vapor in the slag bin and low ambient temperatures have no impact on the dust removal process.
  • the method is highly adaptable to seasonal and regional conditions and has broad application prospects.

Landscapes

  • 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)

Abstract

La présente demande divulgue un appareil d'élimination de poussière pour un bac à scories d'un séchoir à scories pour une centrale thermique et un procédé d'élimination de poussière associé. L'appareil d'élimination de poussière comprend un couvercle de collecte de poussière monté sur un orifice d'évacuation de scories d'un bac à scories. Le couvercle de collecte de poussière est relié à une section horizontale d'un séchoir à scories refroidi par air au moyen d'un tuyau, et une pression négative générée au niveau de la section horizontale du séchoir à scories refroidi par air est utilisée pour fournir une aspiration requise par le couvercle de collecte de poussière pour la collecte de poussière. Un gaz contenant de la poussière collecté par le couvercle de collecte de poussière est utilisé en tant qu'air de refroidissement du séchoir à scories refroidi par air, et est distribué à un four après refroidissement de scories sur une bande transporteuse. Une porte de réglage de tuyau est montée sur le tuyau. Pendant le déchargement de scories à partir du bac à scories, le degré d'ouverture de la porte de réglage de tuyau est ajusté sur la base du volume de déchargement de scories et des conditions de poussière volante pour ajuster le volume d'air du couvercle de collecte de poussière. Selon la présente invention, l'élimination de poussière du bac à scories du séchoir à scories est achevée en utilisant la pression négative dans le four sans augmenter en outre la quantité d'air froid entrant dans le four, ce qui permet d'économiser davantage d'énergie. De plus, une surface de filtre sous la forme d'un sac en tissu classique ou similaire n'est pas nécessaire, et la génération de vapeur dans le bac à scories et une basse température ambiante n'ont pas d'impact sur le processus d'élimination de poussière, de telle sorte que les conditions de fonctionnement de déchargement de scories sèches et de scories humides à partir du bac à scories peuvent toutes deux être adaptées, de telle sorte que la présente invention présente une forte adaptabilité aux saisons et aux régions.
PCT/CN2024/093242 2024-01-22 2024-05-15 Appareil d'élimination de poussière pour bac à scories de séchoir à scories pour centrale thermique et procédé d'élimination de poussière associé Pending WO2025156512A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202410088530.XA CN117927958A (zh) 2024-01-22 2024-01-22 一种火电厂干渣机渣仓除尘装置及其除尘方法
CN202410088530.X 2024-01-22

Publications (1)

Publication Number Publication Date
WO2025156512A1 true WO2025156512A1 (fr) 2025-07-31

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Family Applications (1)

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PCT/CN2024/093242 Pending WO2025156512A1 (fr) 2024-01-22 2024-05-15 Appareil d'élimination de poussière pour bac à scories de séchoir à scories pour centrale thermique et procédé d'élimination de poussière associé

Country Status (2)

Country Link
CN (1) CN117927958A (fr)
WO (1) WO2025156512A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117927958A (zh) * 2024-01-22 2024-04-26 西安热工研究院有限公司 一种火电厂干渣机渣仓除尘装置及其除尘方法

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JP2011195357A (ja) * 2010-03-18 2011-10-06 Pan Pacific Copper Co Ltd スラグ水砕設備の局所排ガス集塵装置
CN203549861U (zh) * 2013-08-28 2014-04-16 河北省电力勘测设计研究院 火力发电厂干式除渣系统
CN206001493U (zh) * 2016-08-24 2017-03-08 百色百矿发电有限公司 一种火力发电厂锅炉除渣系统
CN107062280A (zh) * 2017-06-03 2017-08-18 青岛达能环保设备股份有限公司 燃煤锅炉侧吸式全方位自抑尘与回收系统
CN211119430U (zh) * 2019-11-25 2020-07-28 内蒙古京宁热电有限责任公司 一种干渣机冷却系统
CN212245416U (zh) * 2020-05-27 2020-12-29 国家能源集团泰州发电有限公司 一种干排渣系统渣仓收尘装置
CN213362513U (zh) * 2020-06-19 2021-06-04 德阳劲达节能科技有限责任公司 一种除渣系统
CN216203421U (zh) * 2021-11-05 2022-04-05 田瑞庭 一种燃煤机组干式排渣的治理系统
CN218619260U (zh) * 2022-10-25 2023-03-14 邱杰 排渣扬尘控制装置
CN117927958A (zh) * 2024-01-22 2024-04-26 西安热工研究院有限公司 一种火电厂干渣机渣仓除尘装置及其除尘方法

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011195357A (ja) * 2010-03-18 2011-10-06 Pan Pacific Copper Co Ltd スラグ水砕設備の局所排ガス集塵装置
CN203549861U (zh) * 2013-08-28 2014-04-16 河北省电力勘测设计研究院 火力发电厂干式除渣系统
CN206001493U (zh) * 2016-08-24 2017-03-08 百色百矿发电有限公司 一种火力发电厂锅炉除渣系统
CN107062280A (zh) * 2017-06-03 2017-08-18 青岛达能环保设备股份有限公司 燃煤锅炉侧吸式全方位自抑尘与回收系统
CN211119430U (zh) * 2019-11-25 2020-07-28 内蒙古京宁热电有限责任公司 一种干渣机冷却系统
CN212245416U (zh) * 2020-05-27 2020-12-29 国家能源集团泰州发电有限公司 一种干排渣系统渣仓收尘装置
CN213362513U (zh) * 2020-06-19 2021-06-04 德阳劲达节能科技有限责任公司 一种除渣系统
CN216203421U (zh) * 2021-11-05 2022-04-05 田瑞庭 一种燃煤机组干式排渣的治理系统
CN218619260U (zh) * 2022-10-25 2023-03-14 邱杰 排渣扬尘控制装置
CN117927958A (zh) * 2024-01-22 2024-04-26 西安热工研究院有限公司 一种火电厂干渣机渣仓除尘装置及其除尘方法

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