WO2022016712A1 - 一种改进型分体式紧凑型煤粉分配器 - Google Patents

一种改进型分体式紧凑型煤粉分配器 Download PDF

Info

Publication number
WO2022016712A1
WO2022016712A1 PCT/CN2020/122157 CN2020122157W WO2022016712A1 WO 2022016712 A1 WO2022016712 A1 WO 2022016712A1 CN 2020122157 W CN2020122157 W CN 2020122157W WO 2022016712 A1 WO2022016712 A1 WO 2022016712A1
Authority
WO
WIPO (PCT)
Prior art keywords
split
type
pulverized coal
square
bottom inlet
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.)
Ceased
Application number
PCT/CN2020/122157
Other languages
English (en)
French (fr)
Inventor
员盼锋
杨培军
刘定坡
晋中华
周虹光
王岩
刘洋
赵卫东
时勇强
赵军旗
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
Xian Xire Boiler Environmental Protection Engineering Co Ltd
Original Assignee
Xian Thermal Power Research Institute Co Ltd
Xian Xire Boiler Environmental Protection Engineering 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, Xian Xire Boiler Environmental Protection Engineering Co Ltd filed Critical Xian Thermal Power Research Institute Co Ltd
Publication of WO2022016712A1 publication Critical patent/WO2022016712A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K3/00—Feeding or distributing of lump or pulverulent fuel to combustion apparatus
    • F23K3/02—Pneumatic feeding arrangements, i.e. by air blast
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N3/00—Regulating air supply or draught
    • F23N3/007—Regulating air supply or draught using mechanical means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K2203/00—Feeding arrangements
    • F23K2203/006—Fuel distribution and transport systems for pulverulent fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K2203/00—Feeding arrangements
    • F23K2203/20—Feeding/conveying devices
    • F23K2203/201—Feeding/conveying devices using pneumatic means

Definitions

  • the invention belongs to the field of gas-solid two-phase flow conveying, and relates to an improved split-type compact pulverized coal distributor.
  • the advanced types that can control the pulverized coal distribution deviation within 10% and the wind speed deviation within 5% mainly include dual adjustable pulverized coal distributors and compact pulverized coal distributors.
  • the double adjustable pulverized coal distributor can even be The deviation of pulverized coal distribution is controlled within 5%, but the compact pulverized coal distributor has low requirements for on-site renovation space due to its small size and low cost, and has a wider application range.
  • the compact pulverized coal distributor still has some shortcomings, such as the influence of the non-uniformity of the incoming flow at the inlet, which makes it difficult to further reduce the pulverized coal distribution deviation, and the problem that the annular pulverized coal distribution box cannot be installed when the dynamic separator is arranged on the motor side.
  • the purpose of the present invention is to overcome the above-mentioned shortcomings of the prior art, and to provide an improved split-type compact pulverized coal distributor, which can further effectively reduce the deviation of pulverized coal distribution and is more convenient to install.
  • the improved split-type compact pulverized coal distributor includes a venturi-type diffusion section, a number of split-type silo bodies, a number of resistance adjustment boxes, a number of square and circular reducing pipes and a number of powder outlet pipes;
  • the top outlet of the separator of the coal mill is connected with the bottom inlet of the Venturi diffuser, the bottom inlet of each split silo is connected with the top outlet of the Venturi diffuser, and one split bin corresponds to one resistance adjustment box.
  • a square-circle reducing pipe and a powder outlet pipe the bottom inlet of the resistance adjustment box is connected with the top outlet of the corresponding split silo body, the bottom inlet of the square-circle reducing pipe is connected with the top outlet of the corresponding resistance adjustment box, and the powder is discharged.
  • the bottom inlet of the pipe is communicated with the top inlet of the corresponding square-circle reducing pipe.
  • the split silo body is provided with a powder volume adjusting baffle.
  • the resistance adjustment box is provided with an air volume adjustment baffle.
  • the cross section of the resistance adjustment box is a square structure.
  • the split silo body is a cuboid box body.
  • the split silo bodies are distributed in sequence along the circumferential direction.
  • the improved split-type compact pulverized coal distributor of the present invention replaces the existing conical diffuser section with a venturi diffuser section during specific operation, so as to improve the uniformity of the radial distribution of pulverized coal particles in the annular section at the outlet of the diffuser section , the airflow velocity in the venturi structure changes greatly, which is conducive to the full mixing of the air powder, reduces the distribution deviation of the original pulverized coal at the entrance of the silo, and can further reduce the distribution deviation of the pulverized coal amount between the pulverized coal pipes; at the same time, the invention
  • the use of a split silo body makes the on-site layout more flexible, solves the difficult installation problem under the arrangement of the motor on the side of the dynamic separator, and the split silo body is easier to process, transport and install.
  • Fig. 1 is the structural representation of the present invention
  • FIG. 2 is a cross-sectional view at A-A in FIG. 1 .
  • 1 is the venturi type diffusion section
  • 2 is the split silo body
  • 3 is the resistance adjustment box
  • 4 is the square-circle reducing pipe
  • 5 is the powder outlet pipe
  • 6 is the powder volume adjustment baffle
  • 7 is the air volume adjustment baffle .
  • the improved split-type compact pulverized coal distributor includes a venturi-type diffusion section 1, a number of split-type silo bodies 2, a number of resistance adjustment boxes 3, a number of square-circle reducing pipes 4 and A number of powder outlet pipes 5; the top outlet of the coal mill separator is communicated with the bottom inlet of the Venturi type diffusion section 1, the bottom inlet of each split-type silo 2 is communicated with the top outlet of the Venturi type diffusion section 1, and a
  • the split silo body 2 corresponds to a resistance adjustment box 3, a square-circle reducing pipe 4 and a powder outlet pipe 5.
  • the bottom inlet of the resistance adjusting box 3 is communicated with the top outlet of the corresponding split silo body 2, and the square-circle reducing pipe 4
  • the bottom inlet of 1 is communicated with the top outlet of the corresponding resistance adjustment box 3
  • the bottom inlet of the powder outlet pipe 5 is communicated with the top inlet of the corresponding square-circle reducing pipe 4 .
  • the split silo body 2 is provided with a powder volume adjustment baffle 6; the resistance adjustment box 3 is provided with an air volume adjustment baffle 7; the cross section of the resistance adjustment box 3 is a square structure; the split silo body 2 is a cuboid box; The split-type silo bodies 2 are sequentially distributed along the circumferential direction.
  • the working principle of the present invention is:
  • the primary air powder separated by the coal mill separator enters the Venturi diffuser section 1.
  • the Venturi structure increases the aspect ratio of the diffuser section, so that the inner edge of the inlet ring expands outward, and the coal powder particles move at the inlet.
  • the change of direction makes it easier to spread evenly in the radial direction of the entire space, so as to reduce the particle phase distribution deviation on the inlet section of the split silo body 2, and further reduce the pulverized coal amount distribution deviation between each pulverized coal pipeline; Venturi type
  • the primary air powder output from the diffusion section 1 enters into each split-type bin body 2.
  • the user can adjust the size of the bottom inlet of the split-type bin body 2 through the powder volume adjustment baffle 6 to realize the adjustment of the distribution deviation of the pulverized coal amount.
  • the primary air powder output from the body 2 enters the resistance adjustment box 3, and the air flow resistance is adjusted by adjusting the opening of the air volume adjustment baffle 7 to achieve the leveling of the wind speed deviation.
  • the primary air powder output from the resistance adjustment box 3 passes through the square circle in turn
  • the reducing tube 4 and the powder outlet tube 5 are discharged afterward.
  • the split silo 2 is an independent cuboid box, the number of which is the same as that of the resistance adjustment box 3 and the quantity of the powder outlet pipe 5.
  • the inlet of the split silo 2 is a rectangular section, and the outlet of the split silo 2 is a square. Section, the adjustment range of the powder volume adjusting baffle 6 to the inlet area of the split silo body 2 is the area of the square section to the area of the rectangular section. It is easier to process, transport, and install, and has a wider range of applications and lower costs.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combined Means For Separation Of Solids (AREA)

Abstract

一种改进型分体式紧凑型煤粉分配器，包括文丘里式扩散段（1）、若干分体式仓体（2）、若干阻力调整箱（3）、若干方圆变径管（4）及若干出粉管（5），磨煤机分离器的顶部出口与文丘里式扩散段（1）的底部入口相连通，各分体式仓体（2）沿周向依次分布，各分体式仓体（2）的底部入口与文丘里式扩散段（1）的顶部出口相连通，一个分体式仓体（2）对应一个阻力调整箱（3）、一个方圆变径管（4）及一个出粉管（5），该分配器能够进一步有效降低煤粉分配的偏差。

Description

一种改进型分体式紧凑型煤粉分配器 技术领域
本发明属于气固两相流输送领域，涉及一种改进型分体式紧凑型煤粉分配器。
背景技术
大型电站燃煤锅炉一般采用中速磨直吹式制粉系统，与仓储式制粉系统相比，中速磨煤机出口的各煤粉管道内的一次风粉直接向各燃烧器实时供应，磨煤机出口各煤粉管道内的煤粉量及风量分配均匀与否直接影响到炉内的燃烧强度分布。在燃煤机组向更高的安全性、经济性、环保性、灵活性发展的大背景下，对炉内各燃烧器出口的风粉分配均匀性提出了更高的要求，煤粉分配器作为解决上述问题的装置，经历了数代技术发展，目标是兼顾阻力、安装空间、可调性的前提下，不断的降低各煤粉管道之间的煤粉量、风量偏差。
目前可做到煤粉分配偏差控制在10％以内、风速偏差控制在5％以内的先进型式主要有双可调煤粉分配器和紧凑型煤粉分配器，双可调煤粉分配器甚至可以将煤粉分配偏差控制在5％以内，但紧凑型煤粉分配器因体积小、成本低，对现场改造空间要求低，应用范围更广。紧凑型煤粉分配器仍存在一些缺点，如受入口来流不均匀性的影响导致煤粉分配偏差难以进一步降低、环形煤粉分配箱遇到动态分离器电机侧布置时无法安装的问题。
发明内容
本发明的目的在于克服上述现有技术的缺点，提供了一种改进型分体式紧凑型煤粉分配器，该分配器能够进一步有效降低煤粉分配的偏差，同时安装较为方便。
为达到上述目的，本发明所述的改进型分体式紧凑型煤粉分配器包括文丘里式扩散段、若干分体式仓体、若干阻力调整箱、若干方圆变径管及若干出粉管；
磨煤机分离器的顶部出口与文丘里式扩散段的底部入口相连通，各分体式仓体的底部入口与文丘里式扩散段的顶部出口相连通，一个分体式仓体对应一个阻力调整箱、一个方圆变径管及一个出粉管，阻力调整箱的底部入口与对应分体式仓体的顶部出口相连通，方圆变径管的底部入口与对应阻力调整箱的顶部出口相连通，出粉管的底部入口与对应方圆变径管的顶部入口相连通。
分体式仓体上设置有粉量调节挡板。
阻力调整箱上设置有风量调节挡板。
阻力调整箱的横截面为正方形结构。
分体式仓体为长方体箱体。
各分体式仓体沿周向依次分布。
本发明具有以下有益效果：
本发明所述的改进型分体式紧凑型煤粉分配器在具体操作时，通过文丘里式扩散段取代现有圆锥式扩散段，以提高扩散段出口环形截面煤粉颗粒径向分布的均匀性，文丘里结构内气流速度变化较大，有利于风粉的充分混合，降低了仓体入口的原始煤粉分配偏差，可进一步降低各 煤粉管道之间的煤粉量分配偏差；同时本发明采用分体式仓体，使得现场布置更加灵活，解决了动态分离器侧电机布置下难以安装的难题，且分体式仓体加工、运输及安装都更容易。
附图说明
图1为本发明的结构示意图；
图2为图1中A-A处的截面图。
其中，1为文丘里式扩散段、2为分体式仓体、3为阻力调整箱、4为方圆变径管、5为出粉管、6为粉量调节挡板、7为风量调节挡板。
具体实施方式
下面结合附图对本发明做进一步详细描述：
参考图1及图2，本发明所述的改进型分体式紧凑型煤粉分配器包括文丘里式扩散段1、若干分体式仓体2、若干阻力调整箱3、若干方圆变径管4及若干出粉管5；磨煤机分离器的顶部出口与文丘里式扩散段1的底部入口相连通，各分体式仓体2的底部入口与文丘里式扩散段1的顶部出口相连通，一个分体式仓体2对应一个阻力调整箱3、一个方圆变径管4及一个出粉管5，阻力调整箱3的底部入口与对应分体式仓体2的顶部出口相连通，方圆变径管4的底部入口与对应阻力调整箱3的顶部出口相连通，出粉管5的底部入口与对应方圆变径管4的顶部入口相连通。
分体式仓体2上设置有粉量调节挡板6；阻力调整箱3上设置有风量调节挡板7；阻力调整箱3的横截面为正方形结构；分体式仓体2为长方体箱体；各分体式仓体2沿周向依次分布。
本发明的工作原理为：
经磨煤机分离器分离出来的一次风粉进入到文丘里式扩散段1中，文丘里结构增加了扩散段的高宽比，使得入口环形的内边缘外扩，煤粉颗粒在入口处速度方向的改变使其更容易在整个空间的径向均匀扩散，以减少分体式仓体2入口截面上的颗粒相分布偏差，进一步降低各煤粉管道之间的煤粉量分配偏差；文丘里式扩散段1输出的一次风粉进入各分体式仓体2中，用户可以通过粉量调节挡板6调节分体式仓体2底部入口的大小，实现煤粉量的分配偏差调整，从分体式仓体2输出的一次风粉进入阻力调整箱3中，通过调节风量调节挡板7的开度来调整气流的阻力，实现风速偏差的调平，阻力调整箱3输出的一次风粉再依次经方圆变径管4及出粉管5后排出。
分体式仓体2为各自独立的长方体箱体，数量与阻力调整箱3的数量及出粉管5的数量相同，分体式仓体2的入口为长方形截面，分体式仓体2的出口为正方形截面，粉量调节挡板6对分体式仓体2入口面积的调整范围为所述正方形截面的面积～所述长方形截面的面积，分体式仓体2的设计现场布置更加灵活，长方体仓体的加工、运输、安装都更容易，应用范围更广，成本更低。

Claims (6)

  1. 一种改进型分体式紧凑型煤粉分配器，其特征在于，包括文丘里式扩散段(1)、若干分体式仓体(2)、若干阻力调整箱(3)、若干方圆变径管(4)及若干出粉管(5)；
    磨煤机分离器的顶部出口与文丘里式扩散段(1)的底部入口相连通，各分体式仓体(2)的底部入口与文丘里式扩散段(1)的顶部出口相连通，一个分体式仓体(2)对应一个阻力调整箱(3)、一个方圆变径管(4)及一个出粉管(5)，阻力调整箱(3)的底部入口与对应分体式仓体(2)的顶部出口相连通，方圆变径管(4)的底部入口与对应阻力调整箱(3)的顶部出口相连通，出粉管(5)的底部入口与对应方圆变径管(4)的顶部入口相连通。
  2. 根据权利要求1所述的改进型分体式紧凑型煤粉分配器，其特征在于，分体式仓体(2)上设置有粉量调节挡板(6)。
  3. 根据权利要求1所述的改进型分体式紧凑型煤粉分配器，其特征在于，阻力调整箱(3)上设置有风量调节挡板(7)。
  4. 根据权利要求1所述的改进型分体式紧凑型煤粉分配器，其特征在于，阻力调整箱(3)的横截面为正方形结构。
  5. 根据权利要求1所述的改进型分体式紧凑型煤粉分配器，其特征在于，分体式仓体(2)为长方体箱体。
  6. 根据权利要求1所述的改进型分体式紧凑型煤粉分配器，其特征在于，各分体式仓体(2)沿周向依次分布。
PCT/CN2020/122157 2020-07-21 2020-10-20 一种改进型分体式紧凑型煤粉分配器 Ceased WO2022016712A1 (zh)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202010707239.8A CN111750374A (zh) 2020-07-21 2020-07-21 一种改进型分体式紧凑型煤粉分配器
CN202010707239.8 2020-07-21

Publications (1)

Publication Number Publication Date
WO2022016712A1 true WO2022016712A1 (zh) 2022-01-27

Family

ID=72711191

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2020/122157 Ceased WO2022016712A1 (zh) 2020-07-21 2020-10-20 一种改进型分体式紧凑型煤粉分配器

Country Status (2)

Country Link
CN (1) CN111750374A (zh)
WO (1) WO2022016712A1 (zh)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN119879228A (zh) * 2025-02-25 2025-04-25 西安热工研究院有限公司 一种耦合外置粉仓的制粉系统、制粉方法及锅炉

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111750374A (zh) * 2020-07-21 2020-10-09 西安西热锅炉环保工程有限公司 一种改进型分体式紧凑型煤粉分配器
CN114659133A (zh) * 2022-03-29 2022-06-24 西安热工研究院有限公司 一种带有混合集箱和扩散锥的煤粉分配器
CN114659135A (zh) * 2022-03-29 2022-06-24 西安热工研究院有限公司 一种一体式煤粉量分配调节装置
CN116518408A (zh) * 2023-03-17 2023-08-01 广东红海湾发电有限公司 气固两相二分导流混合均衡调节装置

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101575057A (zh) * 2009-06-10 2009-11-11 煤炭科学研究总院 一种组合式煤粉储供系统
CN101575053A (zh) * 2009-06-10 2009-11-11 煤炭科学研究总院 一种无脉动煤粉供给装置
US20110133009A1 (en) * 2009-12-04 2011-06-09 Wark Rickey E Method and Apparatus for Converting Coal Classifier Outlet to Turret Adapted for Diffusion Technology
CN205261610U (zh) * 2015-11-27 2016-05-25 哈尔滨理工大学 一种新型的风粉混合器
CN205560820U (zh) * 2016-04-07 2016-09-07 山东中科洁能科技有限公司 一种新型煤粉供应装置
CN106196139A (zh) * 2016-08-29 2016-12-07 江苏双良锅炉有限公司 一种带有回转式输送管的煤粉供料系统
CN106185368A (zh) * 2016-08-29 2016-12-07 江苏双良锅炉有限公司 一种煤粉供料装置
CN107191960A (zh) * 2017-06-09 2017-09-22 西安热工研究院有限公司 一种紧凑型煤粉分配器
CN111750374A (zh) * 2020-07-21 2020-10-09 西安西热锅炉环保工程有限公司 一种改进型分体式紧凑型煤粉分配器

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3746642B2 (ja) * 1999-09-06 2006-02-15 三菱重工業株式会社 微粉炭濃度調整装置
CN204388109U (zh) * 2014-12-05 2015-06-10 苏州西热节能环保技术有限公司 一种风粉分配器
CN212408720U (zh) * 2020-07-21 2021-01-26 西安西热锅炉环保工程有限公司 一种改进型分体式紧凑型煤粉分配器

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101575057A (zh) * 2009-06-10 2009-11-11 煤炭科学研究总院 一种组合式煤粉储供系统
CN101575053A (zh) * 2009-06-10 2009-11-11 煤炭科学研究总院 一种无脉动煤粉供给装置
US20110133009A1 (en) * 2009-12-04 2011-06-09 Wark Rickey E Method and Apparatus for Converting Coal Classifier Outlet to Turret Adapted for Diffusion Technology
CN205261610U (zh) * 2015-11-27 2016-05-25 哈尔滨理工大学 一种新型的风粉混合器
CN205560820U (zh) * 2016-04-07 2016-09-07 山东中科洁能科技有限公司 一种新型煤粉供应装置
CN106196139A (zh) * 2016-08-29 2016-12-07 江苏双良锅炉有限公司 一种带有回转式输送管的煤粉供料系统
CN106185368A (zh) * 2016-08-29 2016-12-07 江苏双良锅炉有限公司 一种煤粉供料装置
CN107191960A (zh) * 2017-06-09 2017-09-22 西安热工研究院有限公司 一种紧凑型煤粉分配器
CN111750374A (zh) * 2020-07-21 2020-10-09 西安西热锅炉环保工程有限公司 一种改进型分体式紧凑型煤粉分配器

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN119879228A (zh) * 2025-02-25 2025-04-25 西安热工研究院有限公司 一种耦合外置粉仓的制粉系统、制粉方法及锅炉

Also Published As

Publication number Publication date
CN111750374A (zh) 2020-10-09

Similar Documents

Publication Publication Date Title
WO2022016712A1 (zh) 一种改进型分体式紧凑型煤粉分配器
CN102189024B (zh) 基于磨煤机的复合式制粉系统
CN212901594U (zh) 一种紧凑型煤粉分配器闭环控制系统
GB665247A (en) Improvements in or relating to combustion apparatus
CN105042585B (zh) 煤粉燃烧器
CN107238101A (zh) 一种风粉混合温度和流速二次调节系统
CN203744284U (zh) 一种交替导流式煤粉分配器
CN2529083Y (zh) 回转窑五风道煤粉燃烧器
CN212408720U (zh) 一种改进型分体式紧凑型煤粉分配器
CN105485709A (zh) 一种可调节式煤粉分配器
CN204460265U (zh) 一种锅炉制粉系统中煤粉分离系统
CN111515129A (zh) 一种新型调节粗粉分离器及工作方法
CN107537335B (zh) 一种喷嘴、混合器及供料系统
CN206831550U (zh) 一种紧凑型煤粉分配器
CN203036634U (zh) 一种分级燃烧的低氮氧化物旋流燃烧器
CN211502754U (zh) Cfb锅炉均匀给煤装置
CN109681899A (zh) 一种电站锅炉可调节煤粉均分器及其使用方法
CN203517857U (zh) 一种变转速旋转式煤粉分配器
CN218510891U (zh) 一种用于水泥熟料生产的双旋流燃烧器
CN218455234U (zh) 用于燃煤机组大比例掺烧生物质的燃料分配调节闭环控制系统
CN201357109Y (zh) 磨煤机分离器挡板异步调整装置
CN107191960A (zh) 一种紧凑型煤粉分配器
CN217635722U (zh) 一种用于燃煤机组大比例掺烧生物质的来料均分系统
CN111425880A (zh) 一种风粉两相可调节煤粉分配器和调节煤粉输送的方法
CN115090379A (zh) 一种中速磨煤机气道喷嘴结构

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 20945887

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 20945887

Country of ref document: EP

Kind code of ref document: A1