WO2010108386A1 - 煤粉浓缩装置和包含该煤粉浓缩装置的煤粉燃烧器 - Google Patents

煤粉浓缩装置和包含该煤粉浓缩装置的煤粉燃烧器 Download PDF

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Publication number
WO2010108386A1
WO2010108386A1 PCT/CN2010/000354 CN2010000354W WO2010108386A1 WO 2010108386 A1 WO2010108386 A1 WO 2010108386A1 CN 2010000354 W CN2010000354 W CN 2010000354W WO 2010108386 A1 WO2010108386 A1 WO 2010108386A1
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WO
WIPO (PCT)
Prior art keywords
pulverized coal
bowl
concentrating device
rear portion
front portion
Prior art date
Application number
PCT/CN2010/000354
Other languages
English (en)
French (fr)
Inventor
程昌业
杨家驹
李毅
崔星源
张超群
龚泽儒
张广全
张玉斌
刘鹏
Original Assignee
烟台龙源电力技术股份有限公司
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 烟台龙源电力技术股份有限公司 filed Critical 烟台龙源电力技术股份有限公司
Priority to RU2011142737/06A priority Critical patent/RU2490544C2/ru
Priority to US13/257,584 priority patent/US8555795B2/en
Publication of WO2010108386A1 publication Critical patent/WO2010108386A1/zh

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23DBURNERS
    • F23D1/00Burners for combustion of pulverulent fuel
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23DBURNERS
    • F23D2201/00Burners adapted for particulate solid or pulverulent fuels
    • F23D2201/20Fuel flow guiding devices
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23KFEEDING FUEL TO COMBUSTION APPARATUS
    • F23K3/00Feeding or distributing of lump or pulverulent fuel to combustion apparatus
    • F23K3/02Pneumatic feeding arrangements, i.e. by air blast

Definitions

  • Pulverized coal concentrating device and pulverized coal burner comprising the pulverized coal concentrating device
  • the present invention relates to a pulverized coal concentrating device for a coal-fired boiler pulverized coal burner, particularly an internal combustion pulverized coal burner, and a pulverized coal burner including the pulverized coal concentrating device.
  • the pulverized coal is ignited in the central combustion cylinder 1 by the ignition source, and the lower combustion cylinder is ignited by the ignited pulverized coal flame in the central combustion cylinder 1.
  • the pulverized coal of 2 the pulverized coal in the lower combustion cylinder 3 is ignited step by step, and the pulverized coal in the last combustion cylinder 4 is burned into the furnace.
  • FIG. 13 discloses a plasma burner, as shown in Fig. 13, which comprises at least two stages of combustion cylinders 14, 16 and for igniting the first stage combustion cylinder 14 of the at least two stage combustion cylinders a plasma generator 31 of pulverized coal, wherein the combustion flame of the upper combustion cylinder 14 ignites the pulverized coal in the lower combustion cylinder 16 or is further burned in the lower combustion cylinder 16 with the supplemental air, wherein the plasma
  • the axial direction of the generator is parallel to the direction in which the pulverized coal air stream 32 enters the first stage combustion cylinder 14, while being parallel to the axis of the combustion cylinders 14,16.
  • the plasma pulverized coal burner disclosed in the above patent is a multi-stage cylinder structure, and exists The following disadvantages: The plasma pulverized coal burner is not adaptable to coal quality, wind speed and pulverized coal concentration, and the ignition stability and reliability are insufficient.
  • the object of the present invention is to provide a pulverized coal concentrating device and a pulverized coal burner using the pulverized coal concentrating device, which is particularly suitable for an internal combustion type igniting and igniting pulverized coal burner to improve the pulverized coal burner to coal quality , wind speed and adaptability of pulverized coal concentration.
  • a pulverized coal concentrating device which is fixedly disposed inside a pulverized coal burner and includes a front portion and a rear portion, wherein the front portion is designed as a bowl-like structure for guiding and concentrating coal
  • a gas-solid two-phase flow composed of powder and air hereinafter referred to as "wind powder flow”
  • the rear portion is designed as a cylindrical structure for maintaining a moderate extension of the dense phase of the wind powder flow.
  • the pulverized coal concentrating device of the present invention is designed in one piece, that is, the front portion and the rear portion are integrally formed and the front portion and/or the rear portion are fixedly disposed; or, the pulverized coal concentrating device is designed In the case of a split type, the front portion and the rear portion are separately formed, wherein the front portion is connected to the rear portion and the front portion and/or the rear portion are fixedly disposed, or the front portion The portion is spaced apart from the rear portion by a distance and the front portion and the rear portion are fixedly disposed, respectively.
  • the above distance may be specifically determined according to factors such as coal quality, structural size of each component, pulverized coal ignition and stable combustion requirements, and aerodynamic field characteristics in the furnace.
  • the pulverized coal concentrating device of the present invention the pulverized coal is separated by concentration in the front part of the bowl-like structure, a part of the higher concentration of the air powder flows into the bowl-like structure, and the lower concentration of the air-powder flow enters the lower combustion tube. , so that the pulverized coal gas flow in the bowl structure is concentrated to a concentration level suitable for ignition; at the same time, due to the diversion of the bowl structure, the coal powder is forcibly introduced into the plasma flame zone (or other ignition heat source) to generate high temperature ignition.
  • the pulverized coal volatiles and the coke particles are simultaneously ignited to achieve the initial ignition process.
  • the heterogeneous combustion the pulverized coal particles are quickly ignited.
  • the concentrated phase of pulverized coal can be maintained (divided into a dense phase zone and a light phase zone for the concentration of coal powder, and a region with a large proportion of coal powder in the wind powder flow is called a dense phase zone)
  • the moderate extension of the rest of the area acts as a heat collector to control the effective source of ignition in a narrow area, preventing heat from dissipating from the fire source, and facilitating the formation of a stable flame before igniting the external pulverized coal particles of the concentrating device.
  • the front portion has a bowl opening and a bowl bottom opening
  • the inlet of the rear portion is connected to the bowl mouth or the bowl bottom opening
  • the inlet of the rear portion is connected to the front portion
  • the mouth of the bowl is on the wall between the bowl and the bottom of the bowl.
  • the bowl bottom of an additional bowl member is attached to the outlet of the cylindrical rear portion, and the bowl opening of the bowl front portion and the bowl opening of the additional bowl member are facing away from each other.
  • a vortex zone can be formed in the vicinity of the additional bowl-like structure to enhance the combustion of the pulverized coal flame.
  • the size of the bowl is larger than the size of the bowl bottom.
  • a through hole is formed in the wall of the bowl-shaped structure of the front part, in particular near the bottom of the bowl.
  • the axial length of the front portion is smaller than the axial length of the rear portion.
  • the bowl-shaped structure of the front portion is formed by connecting a plurality of planes to each other or by a curved surface or a combination of both.
  • the bowl-like structure of the front portion is preferably constituted by a curved surface.
  • the tubular structure of the rear portion is formed by connecting a plurality of planes to each other or by a curved surface or a combination of both.
  • the cylindrical structure of the rear portion is preferably constituted by a circular curved surface.
  • the tubular structure is horizontal straight, gradually Expanding or shrinking cylinders, or a combination of them.
  • the divergent structure of the rear part is preferable, which can reduce the flow velocity of the wind powder flow and increase the residence time of the coal powder in the fire stage.
  • a tapered structure can be used to enhance the fire collecting ability. Therefore, the rear portion preferably includes at least one diverging cylinder and/or a tapered cylinder.
  • the bowl wall of the bowl-shaped structure of the front portion is provided with a through hole.
  • a through hole is formed in the vicinity of the bowl bottom of the bowl portion of the front portion.
  • the outlet edge of the rear portion is provided with a toothed structure or a petal-like structure.
  • the angle of the tooth structure or the petal-like structure is 0 degrees to 90 degrees (ie, the teeth or petals are 90 degrees perpendicular to the axis of the cylinder, and the teeth or petals are 0 degrees parallel to the axis of the barrel) .
  • the wall of the tubular portion of the rear portion is also provided with a through hole. Through these holes, the equilibrium pressure difference can be achieved, the wind speed in the rear part structure can be reduced, and ignition can be promoted.
  • the number, shape and size of the holes are set as needed.
  • the holes here may be inclined holes and/or straight holes, wherein the inclined hole concentration effect and the split flow effect are superior to those of the straight holes.
  • the inlet portion of the bowl-shaped structure of the front portion has a square, circular or angular tooth-like or petal-like structure (similar to the tooth structure of the outlet/spout of the rear portion) Or petal-like structure).
  • an additional cylinder is provided on the inside or outside of the rear portion, and an interlayer is formed between the additional cylinder and the cylindrical structure of the rear portion.
  • the additional cylinder is disposed such that a hole in the wall of the front portion is covered by the interlayer to have a flow of air in the interlayer, or is disposed such that a hole in the wall of the front portion is not sandwiched by the interlayer
  • the cover is inside so that there is no air flow in the interlayer.
  • a multi-stage combination of a front portion and a rear portion is provided, the rear portion of the front stage structure and the front portion of the rear stage structure being sequentially nested together.
  • the front and rear portions are arranged coaxially.
  • the pulverized coal burner according to the present invention especially the internal combustion type burner (the conventional burner is pulverized by the pulverized coal injected into the furnace, and is gradually burned by the convection heat of the furnace radiant heat and the high temperature flue gas, and the internal combustion type
  • the burner ignites part of the pulverized coal with an ignition source inside the burner, has started to burn and is then sent to the furnace for combustion, and includes the above-mentioned pulverized coal concentrating device.
  • the pulverized coal burner further comprises at least a primary combustion cylinder and an ignition source.
  • the pulverized coal concentrating device is disposed between the ignition source and the first stage combustion cylinder, the ignition source extending into the bowl structure of the pulverized coal concentrating device and/or
  • the outlet of the pulverized coal concentrating device that is, the outlet of the cylindrical portion of the rear portion, projects into the first stage combustion cylinder.
  • the ignition source, the pulverized coal concentrating device and the combustion cylinder are coaxial with each other.
  • the ignition source is a plasma generator or a small oil gun or high temperature air.
  • the distance between the plasma generator and the bottom of the bowl of the front portion is 10 to 100 mm.
  • the pulverized coal particles are forcibly introduced into the concentrating device of the present invention, and the pulverized coal is separated by concentration in the bowl structure, and the pulverized coal having a higher concentration and a lower velocity enters the bowl structure.
  • the lower concentration of pulverized coal flows into the lower combustion cylinder, so that the pulverized coal gas flow in the bowl structure is concentrated to a concentration level suitable for ignition of different coal types.
  • a small hole is formed in the bowl-shaped structure, and a part of the airflow passes through the small hole in the bowl structure to the outside of the concentrating device, and the dense phase airflow remains in the concentrating device, thereby reducing the wind speed in the concentrating device and reducing
  • the increase in flow rate is not conducive to the impact of fire.
  • the cylindrical structure behind the concentrating device maintains a moderate extension of the pulverized coal dense phase zone, avoiding the pulverized coal entering the bowl structure from contacting the external cold gas flow prematurely in the early stage of the fire without full combustion, and then igniting the outside after a stable flame is formed.
  • Coal powder The hot flame is rapidly expanding at the outlet of the concentrating device and strongly pulverizing with the pulverized coal of the outer cylinder, generating more energy than the ignition source to ignite the next pulverized coal.
  • the pulverized coal is separated by concentration in the bowl structure, the higher concentration of the wind powder flows into the bowl structure, and the lower concentration of the air powder flows into the remaining combustion cylinder, so that the pulverized coal gas flow in the bowl structure is concentrated.
  • concentration level suitable for ignition To a concentration level suitable for ignition;
  • Pulverized coal is in full contact with the ignition source to promote rapid combustion of pulverized coal
  • FIG. 1 is a front elevational view showing a first embodiment of a pulverized coal concentrating device of the present invention
  • Fig. 2 is a perspective view showing a second embodiment of the pulverized coal concentrating device of the present invention
  • Fig. 3 is a view showing the pulverized coal of the present invention.
  • 4 is an isometric view of a third embodiment of the pulverized coal concentrating device of the present invention.
  • FIG. 5 is a perspective view showing a fourth embodiment of the pulverized coal concentrating device of the present invention
  • Figure 6 is a perspective view showing a sixth embodiment of the pulverized coal concentrating device of the present invention
  • Figure 7 is a perspective view showing a seventh embodiment of the pulverized coal concentrating device of the present invention
  • FIG. 9 is a perspective view showing a ninth embodiment of the pulverized coal concentrating device of the present invention
  • FIG. 10 is a perspective view showing a pulverized coal concentrating device of the present invention; a front view of one embodiment of a powder burner;
  • Figure 11 is a longitudinal sectional view showing another embodiment of a pulverized coal burner including the pulverized coal concentrating device of the present invention.
  • Figures 11 and 12 show a prior art pulverized coal burner.
  • Fig. 1 shows a first embodiment of a pulverized coal concentrating device of the present invention, wherein Fig. 1 shows a front view.
  • the pulverized coal concentrating device of the present embodiment includes a cylindrical rear portion 101 and a bowl-shaped front portion 102 composed of a curved surface, the front portion 102 having a bowl opening 109 and a bowl bottom opening 103, the bowl bottom opening 103 and the rear portion 101 The entrance is connected.
  • the pulverized coal air mixed gas stream also referred to as the air powder flow
  • the concentration level after being ignited in the bottom portion 103 of the bowl, continues to be guided into the rear portion 101, and finally the hot flame rapidly expands at the outlet of the concentrating device and strongly blends with the pulverized coal of the next stage, promoting the flame. Coal-coal heat transfer It is easier to form the ignition transfer process of the coal flame.
  • the size D1 of the bowl 109 is greater than the size 1) 2 of the bowl bottom 103.
  • the axial length of the front portion is less than the axial length of the rear portion.
  • the pulverized coal concentrating device may be designed in one piece, that is, the front portion 102 and the rear portion 101 are integrally formed, for example, by casting or injection molding; or the pulverized coal concentrating device may be designed as a split type, Wherein, the front portion 102 and the rear portion 101 are separately formed, and the front portion and the rear portion may be connected together or disposed at a spaced apart distance.
  • Fig. 2 is a perspective view showing a second embodiment of the pulverized coal concentrating device of the present invention.
  • the present embodiment differs from the first embodiment in that the cylindrical rear portion 101 is composed of four or more flat plates and the bowl-shaped front portion 102 is also composed of four or more flat plates.
  • bowl-shaped front portion 102 of the curved surface of Fig. 1 is combined with the cylindrical rear portion 101 of a plurality of planes of Fig. 2, or vice versa, not shown here.
  • Fig. 3 is a front elevational view showing a third embodiment of the pulverized coal concentrating device of the present invention.
  • This embodiment differs from the first embodiment in that a cylindrical rear portion 101 extends from the bowl opening 109 of the bowl-shaped front portion 102. It is also possible that the inlet of the cylindrical rear portion 101 is joined to the wall between the bowl opening 109 of the bowl-shaped front portion 102 and the bowl bottom opening 103.
  • Fig. 4 is a perspective view showing a fourth embodiment of the pulverized coal concentrating device of the present invention.
  • the present embodiment differs from the first embodiment in that a tapered barrel 104 is connected at the outlet of the cylindrical rear portion 101.
  • the tubular structure of the rear portion may also be designed as a straight cylinder, a diverging cylinder or a tapered cylinder, or a combination of different forms thereof. In the sense of the present invention, such a combination can also be regarded as a "post-part" as a whole.
  • the axial length of the overall "rear portion" is preferably greater than the axial length of the bowl-shaped front portion.
  • FIG. 5 is a front elevational view showing a fifth embodiment of the pulverized coal concentrating device of the present invention, in which an additional bowl portion is connected to the outlet of the cylindrical rear portion 101.
  • the bowl bottom 103 of the piece 104, and the bowl opening 109 of the bowl-shaped front portion 102 and the bowl opening 110 of the additional bowl member 104 face away from each other.
  • the size D1 of the bowl opening 109 is greater than the size D2 of the bowl bottom opening 103.
  • the size of the bowl opening 111 is greater than the size of the bowl bottom opening 112.
  • the combination of such an intermediate straight cylinder with the additional bowl member 104 can also be viewed as a "rear portion" as a whole.
  • the axial length of such a "back portion” as a whole is preferably greater than the axial length of the bowl-shaped front portion.
  • Fig. 6 is a perspective view showing a sixth embodiment of the pulverized coal concentrating device according to the present invention.
  • a plurality of holes 105 are distributed in the peripheral wall of the front portion 102. These holes are preferably provided on the peripheral wall of the front portion 102 at a position close to the bowl bottom 103.
  • the number, shape and size of the holes are set according to actual needs.
  • the shape of the hole may be a slanted hole or a straight hole. Alternatively or additionally, such a hole may be distributed on the peripheral wall of the rear portion 101.
  • Fig. 7 is a perspective view showing a seventh embodiment of the pulverized coal concentrating device of the present invention.
  • the present embodiment differs from the first embodiment in that an angular tooth-like structure 106 is provided on the spout of the cylindrical rear portion 101, i.e., the periphery of the outlet.
  • the angle of the toothed structure is from 0 to 90 degrees (the toothed structure is 90 degrees perpendicular to the axis of the cylinder and the toothed structure is 0 degrees parallel to the axis of the barrel).
  • the spout 106 on the spout of the cylindrical rear portion 101, i.e., the exit periphery, it may also be designed as an angled petal structure.
  • Fig. 8 is a front elevational view showing an eighth embodiment of the pulverized coal concentrating device of the present invention.
  • the bowl-shaped front portion 102 is connected to the inlet of the cylindrical rear portion 101 through its bowl bottom.
  • An additional cylinder 108 is provided on the outside of the rear portion 101, the additional cylinder being attached to the wall of the front portion 102 such that a sandwich 110 is formed between the additional cylinder and the tubular structure of the rear portion.
  • the additional cylinder 108 is disposed such that the interlayer 110 formed by the rear partial inner cylinder and the additional cylinder 108 will have the front portion A hole 105 in the wall of 102 is covered inside. It is also possible that the additional cylinder 108 is disposed such that the interlayer 110 formed by the inner cylinder of the rear portion 101 and the additional cylinder 108 does not cover the hole 105 in the wall of the front portion 102.
  • Fig. 9 is a perspective view showing a ninth embodiment of the pulverized coal concentrating device of the present invention.
  • a two-stage combination structure including a front portion 102, 102, and a rear portion 101, 101 is provided, and a rear portion 101 of the first-stage structure is nested inside the front portion 102 of the second-stage structure.
  • the extension can be extended as such.
  • FIG 10 is a longitudinal cross-sectional view showing an embodiment of a pulverized coal burner of the present invention comprising the pulverized coal concentrating device of the present invention.
  • the pulverized coal burner comprises a two-stage combustion cylinder (a first-stage combustion cylinder 201, a second-stage combustion cylinder 202, that is, a burner outer cylinder), a rear portion 101, a front portion 102, and a hole 105 disposed inside the pulverized coal burner a pulverized coal concentrating device, and a plasma generator 301, the rear portion 101 is fixed to the pulverized coal burner (may also be, the front portion 102 is fixed to the pulverized coal burner, or the front portion 102 and the rear portion 101 are simultaneously Is fixed on the pulverized coal burner).
  • the connecting member may be used to connect the pulverized coal concentrating device to the combustion cylinder wall of the pulverized coal burner, thereby fixing the pulverized coal concentrating device inside the combustion cylinder, preferably the axis of the pulverized coal concentrating device and the axis of the burner Coincidence; It is also possible to fix the pulverized coal concentrating device to the plasma generator through the connecting member, or to adopt other fixing methods.
  • the pulverized coal concentrating device is disposed between the plasma generator 301 and the first stage combustion cylinder 201.
  • the plasma generator 301 extends into the bowl-like structure of the front portion 102 of the pulverized coal concentrating device and the outlet of the pulverized coal concentrating device, that is, the outlet of the cylindrical structure of the rear portion 101, projects into the first stage combustion tube 201 in.
  • the distance L3 between the plasma generator and the bottom portion of the front portion of the bowl is 10 to 100 mm.
  • a plasma generator a small oil gun or other suitable ignition source can also be used.
  • the plasma generator, pulverized coal Preferably, the shrinking device and the combustion cylinder are coaxial with each other.
  • the pulverized coal burner of the present invention is divided into several stages. After the concentrated structure is adopted, the heat accumulation ability is enhanced and the combustion flame intensity is increased.
  • Fig. 11 is a longitudinal sectional view showing another embodiment of the pulverized coal burner of the present invention comprising the pulverized coal concentrating device of the present invention.
  • the other embodiment differs from the embodiment shown in Fig. 10 in that the front portion 102 and the rear portion 101 are spaced apart by a certain distance and are respectively fixed to the pulverized coal burner.
  • the size of the bowl bottom 103 of the front portion 102 is preferably smaller than or equal to the size of the inlet of the rear portion 101, whereby the rearward portion of the wind can be complemented to optimize combustion and formation of coking on the wall of the rear portion can be avoided.
  • the distance between the partitions can be determined according to factors such as the structural size of each component and the ignition condition.
  • the plasma generator 301 is activated to generate a high temperature, high enthalpy plasma flame, and the pulverized coal air stream (also referred to as the air powder flow) enters the front portion of the concentrating device from the bowl 109. 102, a part of the airflow passes through the small hole 105 in the bowl structure to the outside of the concentrating device, and the dense phase airflow remains in the concentrating device, thereby reducing the wind speed in the concentrating device; the small hole 105 can reduce the wind speed and reduce The increase in flow rate is not conducive to the impact of fire.
  • the pulverized coal particles are forcibly introduced into the central arc region where the plasma flame temperature is high, and the airflow of the wind powder is concentrated to a concentration level suitable for ignition.
  • the pulverized coal was quickly ignited at an early stage.
  • the airflow from the bowl bottom 103 enters the rear portion 101 and continues to be guided.
  • the hot flame expands rapidly at the outlet of the concentrating device, and is strongly mixed with the pulverized coal of the next stage, generating more energy than the ignition source.
  • the pulverized coal entering the first stage sleeve 201 is ignited.
  • the second-stage sleeve 202 that is, the pulverized coal in the outer cylinder of the burner, is ignited and finally injected into the furnace for combustion.
  • the invention has been described in detail above based on embodiments of the invention, but It is the invention that is not limited thereto.
  • the key point of the concentrating device of the present invention is that the front portion of the concentrating device is designed as a bowl-like structure for guiding and concentrating the gas-solid two-phase flow composed of pulverized coal and air, and the latter portion is designed as a cylindrical structure for Maintaining a moderate extension of the dense phase of the wind powder stream, the combination of the two achieves the objectives of the present invention.
  • the front portion and the rear portion are relative to the flow direction of the wind powder flow, with the front portion being the front portion along the flow direction and the rear portion being the rear portion.
  • the pulverized coal concentrating device of the present invention can fully apply to other related technical fields, such as industrial kilns, without the need for creative labor, as needed.
  • the pulverized coal concentrating device of the present invention can also be used to concentrate other fluids, such as other gas-solid two-phase flows.

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Description

煤粉浓縮装置和包含该煤粉浓縮装置的煤粉燃烧器 技术领域
本发明涉及一种用于燃煤锅炉煤粉燃烧器、 尤其是内燃式煤 粉燃烧器的煤粉浓缩装置和一种包括该煤粉浓缩装置的煤粉燃烧 器。
背景技术
在世界范围内, 传统火力发电厂和很多工业用燃煤锅炉的启 动点火及低负荷稳燃都是采用燃烧重油、 柴油或天然气的方法来 实现煤粉的着火引燃过程, 每年要消耗大量的燃油。 近年来所发 展的等离子体点火及稳燃技术, 在很大程度上节约了大量点火燃 油, 实现了煤粉锅炉的无油启动。 中国专利 CN03268412.6公开 了一种分级点火燃烧器, 如图 12所示, 它包括外燃烧筒 4、 点火 源 (未示出) , 其中在外燃烧筒 4 内设中心筒 1, 在中心筒 1与 外燃烧筒 4之间设 n级内燃烧筒 2、 3 ... , 利用点火源在中心燃烧 筒 1 中点燃煤粉, 用中心燃烧筒 1 中被点燃的煤粉火焰点燃下级 内燃烧筒 2的煤粉, 以后逐级点燃下一级燃烧筒 3 中的煤粉, 最 后一緝燃烧筒 4中的煤粉进入炉膛燃烧。
中国专利 CN200720146244.6披露了一种等离子体燃烧器, 如图 13所示, 它包括至少两级燃烧筒 14、 16以及用于点燃所述 至少两级燃烧筒中的第一级燃烧筒 14中的煤粉的等离子体发生器 31 , 其中上一级燃烧筒 14的燃烧火焰点燃下一级燃烧筒 16中的 煤粉或者在下一级燃烧筒 16中与补充的空气进一步燃烧, 其中, 该等离子体发生器的轴线方向与含煤粉空气流 32进入第一级燃烧 筒 14的方向平行, 同时平行于燃烧筒 14、 16的轴线。
上述专利公开的等离子体煤粉燃烧器均为多级筒结构, 存在 以下缺点: 等离子体煤粉燃烧器对煤质、 风速和煤粉浓度的适应 性不强, 着火稳定性和可靠性不足。
发明内容
本发明的目的是, 提供一种煤粉浓缩装置和采用该煤粉浓缩 装置的煤粉燃烧器, 特别适用于内燃式着火稳燃方式的煤粉燃烧 器, 以提高煤粉燃烧器对煤质、 风速和煤粉浓度的适应性。
按本发明的煤粉浓缩装置, 它固定地设置在煤粉燃烧器的内 部并且包括一个前部分和一个后部分, 其特征在于, 所述前部分 设计成碗状结构, 用于引导和浓缩煤粉与空气组成的气固两相流 (以下简称"风粉流") , 所述后部分设计为筒状结构, 用于保持风 粉流浓相区的适度延伸。
优选地, 本发明的煤粉浓缩装置设计为整体式的, 即所述前 部分和后部分整体制成并且所述前部分和 /或后部分被固定地设 置; 或者, 该煤粉浓缩装置设计为分体式的, 所述前部分和后部 分分别单独制成, 其中, 所述前部分与所述后部分相连接并且所 述前部分和 /或后部分被固定地设置, 或者, 所述前部分与所述后 部分间隔开一定距离布置并且所述前部分和后部分分别被固定地 设置。
在此, 上述距离可以根据煤质、 各部件的结构尺寸、 煤粉着 火与稳燃的要求, 以及炉内空气动力场特征等因素来具体确定。
在本发明的煤粉浓缩装置中, 通过前部分的碗状结构对煤粉 进行浓淡分离, 一部分浓度较高的风粉流进入碗状结构内, 浓度 较低的风粉流进入下级燃烧筒内, 使碗式结构内的煤粉气流被浓 缩到适合点火的浓度水平; 同时由于碗状结构的导流作用, 煤粉 被强行导入等离子体焰区 (或其他点火热源内) , 产生高温引燃 效果, 使得煤粉挥发份与焦炭颗粒同时着火, 实现初期着火过程 的非均相燃烧, 煤粉颗粒被快速引燃。 同时, 通过后部分的筒状 结构, 能够保持煤粉浓相区 (对煤粉浓度而言分为浓相区和淡相 区, 煤粉占风粉流的比例大的区域称为浓相区, 其余区域称为淡 相区) 的适度延伸, 起到聚热作用, 从而把有效的火源控制在一 个狭小的区域, 防止火源散热, 便于形成稳定火焰后再点燃浓缩 装置外部煤粉颗粒。
本发明的优选实施方式, 所述前部分具有一个碗口和一个碗 底口, 所述后部分的入口与该碗口或碗底口连接, 或者所述后部 分的入口连接在所述前部分的碗口与碗底口之间的壁上。
按照本发明的优选实施方式, 一个附加的碗状部件的碗底口 连接在筒状的后部分的出口上, 而且碗状前部分的碗口与附加的 碗状部件的碗口彼此背向。 附加碗状结构附近能够形成涡流区, 强化煤粉火焰燃烧。
本发明的优选实施方式, 所述碗口的尺寸大于碗底口的尺 寸。
按照本发明的优选实施方式, 在前部分的碗状结构的壁上, 尤其是在碗底附近开有通孔。
按照本发明的优选实施方式, 前部分的轴向长度小于后部分 的轴向长度。
按照本发明的优选实施方式, 所述前部分的碗状结构由多个 平面彼此连接而成或者由曲面构成或者两者的组合。 所述前部分 的碗状结构优选由圆弧曲面构成。
按照本发明的优选实施方式, 所述后部分的筒状结构由多个 平面彼此连接而成或者由曲面构成或者两者的组合。 所述后部分 的筒状结构优选由圆弧曲面构成。
按照本发明的优选实施方式, 所述筒状结构为水平直筒、 渐 扩筒或渐缩筒, 或者为它们的组合。 其中, 后部分的渐扩结构为 优选, 能够降低风粉流的流速, 增加着火段煤粉停留时间。 当 然, 对挥发份很低、 水份和灰份又很高的难燃劣质煤来说, 可以 采用渐缩结构, 以使聚火能力增强。 因此, 后部分优选至少包括 一个渐扩筒和 /或渐缩筒。
按照本发明的优选实施方式, 所述前部分的碗状结构的碗壁 上开有通孔。 优选在所述前部分的碗状结构的碗底附近开有通 孔。 通过碗状结构碗壁上的孔, 能够浓缩、 分流淡相气流, 保留 浓相气流; 平衡压差, 减小风速, 降低因流速增大不利于着火的 影响, 使得在煤粉浓度提高的同时, 风粉流流速并没有同比例地 增大。
按照本发明的优选实施方式, 所述后部分的出口边缘设有齿 状结构或者花瓣状结构。 优选地, 所述齿状结构或者花瓣状结构 的角度为 0度到 90度(即, 齿或花瓣朝筒外垂直于筒轴线时为 90度, 齿或花瓣平行于筒轴线时为 0度) 。 通过后部分的出口边 缘上的齿状结构或者花瓣状结构, 能够增加煤粉着火前沿扰动, 形成回流和区域涡流, 促进燃烧。 在煤质稍差的情况下可以采用 这种结构。
按照本发明的优选实施方式, 所述后部分的筒状结构的壁也 开有通孔。 通过这些孔, 能够实现平衡压差, 降低后部分结构内 风速, 促进点火。 孔的数量, 形状和大小根据需要设置。 这里的 孔可以是斜孔和 /或直孔, 其中, 斜孔浓缩效果和分流效果优于直 孔。
按照本发明的优选实施方式, 所述前部分的碗状结构的入口 截面形状为方形、 圆形或带角度的齿状或者花瓣状结构 (类似于 所述后部分的出口 /喷口的齿状结构或者花瓣状结构) 。 通过此实 施例也能够实现风粉流浓缩、 均流。
按照本发明的优选实施方式, 在所述后部分的内侧或外侧设 有一个附加筒, 在该附加筒与所述后部分的筒状结构之间形成一 个夹层。 所述附加筒设置成使得所述前部分的壁上的孔被所述夹 层罩在里面从而在夹层中有风粉流, 或者设置成使得所述前部分 的壁上的孔不被所述夹层罩在里面从而在夹层中没有风粉流。 通 过该夹层能够实现保温聚热, 使冷热介质分离, 易于中心浓相区 的形成以及二次着火前沿补氧和扰动等诸多效果。
本发明的,优选实施方式, 设有前部分和后部分的多级组合结 构, 前一级结构的后部分与后一级结构的前部分依次嵌套在一 起。 由此能够强化单级的作用, 使本发明煤粉浓缩装置的所有优 点更突出, 煤质、 风速和煤粉浓度适应性更强。
按照本发明的优选实施方式, 所述前部分和后部分同轴地设 置。
按照本发明的煤粉燃烧器, 尤其是内燃式燃烧器 (常规的燃 烧器都是煤粉喷入炉膛用油枪点燃, 依靠炉膛辐射热和高温烟气 的对流热而逐步燃烧, 而内燃式燃烧器就是在燃烧器内部用点火 源将部分煤粉点燃, 已经开始着火燃烧, 再送入炉膛中燃烧) , 它包括上述的煤粉浓缩装置。
按照本发明的优选实施方式, 该煤粉燃烧器还包括至少一级 燃烧筒和点火源。
按照本发明的优选实施方式, 所述煤粉浓缩装置设置在点火 源与第一级燃烧筒之间, 所述点火源伸入到所述煤粉浓缩装置的 碗状结构内和 /或所述煤粉浓缩装置的出口、 即所述后部分的筒状 结构的出口伸入到第一级燃烧筒中。
在该燃烧器中, 由于采用了上述的煤粉浓缩装置, 使得聚热 能力增强, 同时燃烧火焰强度增大。
按照本发明的优选实施方式, 点火源、 煤粉浓缩装置和燃烧 筒三者彼此同轴。
按照本发明的优选实施方式, 所述点火源为等离子发生器或 者小油枪或高温空气。
按照本发明的优选实施方式, 所述等离子发生器与所述前部 分的碗底口的距离为 10 ~ 100mm。
在本发明的煤粉燃烧器中, 煤粉颗粒被强行导入本发明的浓 缩装置中, 通过碗式结构对煤粉进行浓淡分离, 浓度较高和速度 较低的煤粉流进入碗式结构内, 浓度较低的煤粉流进入下级燃烧 筒内, 使碗式结构内的煤粉气流被浓缩到适合不同煤种点火所要 求的浓度水平。 优选地, 在碗状结构开有小孔, 一部分气流经过 碗状结构上的小孔到达该浓缩装置的外部, 浓相气流留在该浓缩 装置内, 这样降低了该浓缩装置内的风速, 降低因流速增大带来 不利于着火的影响。 浓缩装置后面的筒状结构, 保持煤粉浓相区 的适度延伸, 避免进入碗状结构的煤粉在着火初期过早与外部冷 态气流接触而没有充分燃烧, 待形成稳定火焰后再点燃外部煤 粉。 灼热火焰的在浓缩装置出口处迅速扩展与外筒的煤粉进行强 烈的交混, 产生较点火源更大的能量点燃下一级煤粉。
本发明产生了以下效果:
• 通过碗式结构对煤粉进行浓淡分离, 浓度较高和的风粉流 进入碗式结构内, 浓度较低的风粉流进入剩余燃烧筒内, 使碗式 结构内的煤粉气流被浓缩到适合点火的浓度水平;
• 煤粉与点火源充分接触, 促进煤粉迅速燃烧;
• 对已着火的根部火焰有显著的聚热保温效果, 提高了着火 可靠性。 附图说明
以下借助附图和实施例详细描述本发明。 附图中:
图 1示出本发明的煤粉浓缩装置的笫一实施例的主视图; 图 2示出本发明的煤粉浓缩装置的第二实施例的轴测图; 图 3示出本发明的煤粉浓缩装置的笫三实施例的轴测图; 图 4示出本发明的煤粉浓缩装置的第四实施例的轴测图; 图 5示出本发明的煤粉浓缩装置的第五实施例的主视图; 图 6示出本发明的煤粉浓缩装置的笫六实施例的轴测图; 图 7示出本发明的煤粉浓缩装置的第七实施例的轴测图; 图 8示出本发明的煤粉浓缩装置的笫八实施例的轴测图; 图 9示出本发明的煤粉浓缩装置的第九实施例的轴测图; 图 10示出包括本发明煤粉浓缩装置的煤粉燃烧器的一个实施 例的主视图;
图 11示出包括本发明煤粉浓缩装置的煤粉燃烧器的另一个实 施例的纵剖视图;
图 11和图 12示出现有技术的煤粉燃烧器。
具体实施方式
图 1 示出本发明的煤粉浓缩装置的第一实施例, 其中图 1示 出主视图。 本实施例的煤粉浓缩装置包括圆筒状的后部分 101 和 由曲面构成的碗状的前部分 102, 前部分 102具有碗口 109和碗 底口 103 , 该碗底口 103与后部分 101 的入口连接。 煤粉空气混 合气流(也称为风粉流)从碗口 109进入碗状的前部分 102 内, 通过碗状结构 (口大底小) 导流和浓缩作用, 风粉气流被浓缩到 适合点火的浓度水平, 在碗底口 103部位被点燃之后, 进入后部 分 101 中继续被引导, 最后灼热的火焰在浓缩装置出口处迅速扩 展与下一级的煤粉进行强烈的交混, 促进了火焰的煤 -煤热量传 递, 较易形成煤火焰的点火传递过程。 在所示结构中, 碗口 109 的尺寸 D1大于碗底口 103的尺寸 1)2。 优选地, 前部分的轴向长 度小于后部分的轴向长度。
在本发明中, 煤粉浓缩装置可以设计为整体式的, 即前部分 102 和后部分 101 整体制成, 比如通过铸造或者注塑方法; 或 者, 该煤粉浓缩装置也可以设计为分体式的, 其中, 前部分 102 和后部分 101 分别单独制成, 并且前部分与后部分可以连接在一 起或者被间隔开距离地设置。
图 2示出本发明的煤粉浓缩装置的第二实施例的轴测图。 本 实施例与第一实施例区别在于, 筒状后部分 101 由四块或更多块 平板构成和碗状前部分 102同样由四块或更多块平板组成。
也可以是图 1的由曲面构成的碗状前部分 102和图 2的由多 个平面构成的筒状后部分 101 结合, 或者反过来, 在此没有—— 示出。
图 3 示出本发明的煤粉浓缩装置的第三实施例的主视图。 该 实施例与第一实施例区别在于, 圆筒状的后部分 101 从圆碗状的 前部分 102的碗口 109开始延伸。 也可以是筒状后部分 101的入 口连接在碗状前部分 102的碗口 109与碗底口 103之间的壁上。
图 4 示出本发明的煤粉浓缩装置的第四实施例的轴测图。 本 实施例与第一实施例区别在于, 在筒状后部分 101 的出口处连接 锥状筒 104。 在本发明中, 所述后部分的筒状结构也可以设计为 直筒、 渐扩筒或渐缩筒、 或者其不同形式的组合。 在本发明的意 义上, 这种组合也可以整体上看作为一个 "后部分"。 这种整体上 的 "后部分"的轴向长度优选大于碗状前部分的轴向长度。
图 5 示出本发明的煤粉浓缩装置的第五实施例的主视图, 在 该实施例中, 在筒状的后部分 101 的出口连接一个附加的碗状部 件 104的碗底口 103, 并且碗状前部分 102的碗口 109与附加的 碗状部件 104的碗口 110彼此背向。 在所示结构中, 碗口 109的 尺寸 D1大于所述碗底口 103的尺寸 D2, 同样地, 碗口 111的尺 寸大于所述碗底口 112 的尺寸。 在本发明的意义上, 这种中间直 筒与附加的碗状部件 104 的组合也可以整体上看作为一个"后部 分"。 这种整体上的 "后部分"的轴向长度优选大于碗状前部分的轴 向长度。
图 6 示出按本发明的煤粉浓缩装置的第六实施例的轴测图。 在本实施例中, 在前部分 102 的周壁上分布有许多的孔 105。 这 些孔优选是设置在前部分 102的周壁上靠近碗底口 103的位置。 孔的数量、 形状和大小按照实际的需要设定。 孔的形状可以是斜 孔或直孔。 可选地或者作为补充, 也可以在后部分 101 的周壁上 分布设置这样的孔。
图 7 示出本发明的煤粉浓缩装置的第七实施例的轴测图。 本 实施例与第一实施例区别在于, 在筒状后部分 101 的喷口、 即出 口周缘上设有带角度的齿状结构 106。 优选地, 齿状结构的角度 为 0度到 90度(齿状结构朝筒外垂直于筒轴线时为 90度, 齿状 结构平行于筒轴线时为 0度) 。 代替在筒状后部分 101 的喷口、 即出口周缘上的齿状结构 106 , 也可以设计为带角度的花瓣结 构。
图 8 示出本发明的煤粉浓缩装置的第八实施例的主视图。 在 本实施例中, 圆碗状的前部分 102通过其碗底口与圆筒状的后部 分 101 的入口连接。 在后部分 101 的外部设有一个附加筒 108, 该附加筒连接在前部分 102 的壁上, 从而在该附加筒与所述后部 分的筒状结构之间形成一个夹层 110。 在本实施例中, 附加筒 108 设置成使得由后部分内筒和附加筒 108形成的夹层 110将前部分 102的壁上的孔 105罩在里面。 也可以是附加筒 108设置成使得 由后部分 101的内筒和附加筒 108形成的夹层 110没有将前部分 102的壁上的孔 105罩在里面。
图 9示出本发明的煤粉浓缩装置的第九实施例的轴测图。 在 本实施例中, 设有包括前部分 102、 102,和后部分 101、 101,的两 级组合结构, 第一级结构的后部分 101 嵌套在第二级结构的前部 分 102,内。 对于本发明多级煤粉浓缩装置结构, 可依此类推延 伸。
图 10示出本发明的包括本发明煤粉浓缩装置的煤粉燃烧器的 一个实施例的纵剖视图。 该煤粉燃烧器包括两级燃烧筒 (第一级 燃烧筒 201、 第二级燃烧筒 202 即燃烧器外筒) 、 在煤粉燃烧器 内部设置的具有后部分 101、 前部分 102、 孔 105 的煤粉浓缩装 置、 以及等离子发生器 301 , 该后部分 101 被固定在煤粉燃烧器 上 (也可以是, 前部分 102被固定在煤粉燃烧器上, 或者前部分 102和后部分 101 同时被固定在煤粉燃烧器上) 。 在这里, 可以 利用连接件来将煤粉浓缩装置与煤粉燃烧器的燃烧筒壁连接, 从 而把煤粉浓缩装置固定在燃烧筒的内部, 优选使煤粉浓缩装置的 轴线和燃烧器的轴线重合; 也可以通过连接件将煤粉浓缩装置固 定在等离子发生器上, 或者采取其他的固定方式。 该煤粉浓缩装 置设置在等离子发生器 301与笫一级燃烧筒 201之间。 等离子发 生器 301伸入煤粉浓缩装置的前部分 102的碗状结构内并且所述 煤粉浓缩装置的出口、 即所述后部分 101 的筒状结构的出口伸入 到笫一级燃烧筒 201 中。 所述等离子发生器与所述前部分碗底口 的距离 L3为 10 ~ 100mm。 采用上述距离, 可以最大限度的实现 着火稳定性, 增强煤质的点火适应性。 代替等离子发生器也可以 采用小油枪或者其他合适的点火源。 所述等离子发生器、 煤粉浓 缩装置和燃烧筒优选三者彼此同轴。 本发明的煤粉燃烧器内部分 为若干级, 采用该浓缩结构后, 由于聚热能力增强, 同时燃烧火 焰强度增大。
图 11示出本发明的包括本发明煤粉浓缩装置的煤粉燃烧器的 另一个实施例的纵剖视图。 该另一实施例与图 10所示实施例的区 别在于, 前部分 102和后部分 101 间隔开一定的距离设置并且分 别被固定在煤粉燃烧器上。 其中, 前部分 102的碗底口 103的尺 寸优选小于或等于后部分 101 的入口的尺寸, 由此可实现向后部 分补风以便优化燃烧并且能够避免在后部分的壁上形成结焦。 在 此, 间隔开的距离可以根据各部件的结构尺寸和点火工况等因素 确定。
在本发明的煤粉燃烧器中, 等离子发生器 301 启动后产生高 温度、 高焓值的等离子体焰, 煤粉空气流(也称为风粉流) 从碗 口 109进入浓缩装置的前部分 102 内, 一部分气流经过碗状结构 上的小孔 105到达该浓缩装置的外部, 浓相气流留在该浓缩装置 内, 这样降低了该浓缩装置内的风速; 小孔 105可以减小风速, 减少因流速增大不利于着火的影响。 通过碗状结构 (口大底小) 导流和浓缩作用, 煤粉颗粒被强行导入等离子体焰温度较高的中 心弧区, 风粉气流被浓缩到适合点火的浓度水平, 在被等离子体 焰点燃之后, 煤粉在初期被迅速点燃。 风粉气流从碗底口 103进 入后部分 101 中继续被引导, 最后灼热的火焰在浓缩装置出口处 迅速扩展, 与下一级的煤粉进行强烈的交混, 产生较点火源更大 的能量点燃进入第一级套筒 201 中的煤粉。 笫一级套筒 201 中的 煤粉被点燃后, 再点燃第二级套筒 202 即燃烧器外筒中的煤粉, 最后喷入炉膛中燃烧。
当然, 以上已经基于本发明的实施例详细描述了本发明, 但 是本发明并不限于此。 本发明的浓缩装置的构思关键点就在于, 浓缩装置的前部分设计成碗状结构, 用于引导和浓缩煤粉和空气 组成的气固两相流, 而后部分设计为筒状结构, 用于保持风粉流 浓相区的适度延伸, 这两者结合实现本发明的目的。 前部分和后 部分是相对于风粉流的流动方向而言的, 沿着流动方向在前面的 为前部分, 而在后面的则为后部分。 本领域技术人员完全可以才艮 据需要容易地无需创造性劳动将本发明的煤粉浓缩装置应用于其 他的相关技术领域, 比如工业窑炉。 而且, 本发明煤粉浓缩装置 也可以用于浓缩其他的流体, 比如其他的气固两相流。 这些变型 方案及其他等效的变型方案都应落入本专利申请的保护范围之 内。

Claims

权 利 要 求
1. 一种用于煤粉燃烧器的煤粉浓缩装置, 该煤粉浓缩装置固定 地设置在煤粉燃烧器的内部, 并且包括一个前部分(102) 和一个 后部分(101) , 其特征在于, 所述前部分(102)设计成碗状结 构, 用于引导和浓缩风粉流, 所述后部分 (101)设计为筒状结 构, 用于保持风粉流浓相区的适度延伸。
2. 如权利要求 1所述的煤粉浓缩装置, 其特征在于, 该煤粉浓 缩装置设计为整体式的, 即所述前部分(102) 和后部分(101) 整体制成, 并且所述前部分(102) 和 /或后部分(101)被固定地 设置; 或者, 该煤粉浓缩装置设计为分体式的, 所述前部分 ( 102 ) 和后部分 ( 101 ) 分别单独制成, 其中, 所述前部分 (102) 与所述后部分(101)相连接并且所述前部分(102) 和 /或 后部分 (101)被固定地设置, 或者, 所述前部分(102) 与所述 后部分(101) 间隔开一定距离布置并且所述前部分(102) 和后 部分( 101 ) 分别被固定地设置。
3. 如权利要求 1所述的煤粉浓缩装置, 其特征在于, 所述前部 分(102)具有一个碗口 (109) 和一个碗底口 (103) , 所述后部 分(101) 的入口与该碗口 (109) 或碗底口 (103)连接, 或者所 述后部分(101) 的入口连接在所述前部分 (102) 的碗口 (109) 与碗底口 (103)之间的壁上。
4. 如权利要求 1所述的煤粉浓缩装置, 其特征在于, 所述后部 分(101) 的筒状结构为直筒、 渐扩筒或渐缩筒, 或为其不同形式 的组合。
5. 如权利要求 1所述的煤粉浓缩装置, 其特征在于, 一个附加 的碗状部件 (104) 的碗底口 (103)连接在筒状的后部分(101) 的出口上, 而且碗状前部分(102) 的碗口 (109) 与附加的碗状 部件 (104) 的碗口 (111)彼此背向。
6. 如权利要求 3或 5所述的煤粉浓缩装置, 其特征在于, 所述 碗口 (109、 111 ) 的尺寸 (D1) 大于所述碗底口 (103、 112) 的 尺寸 (D2) 。
7. 如权利要求 1至 5之任一项所述的煤粉浓缩装置, 其特征在 于, 在所述前部分(102) 的碗状结构的壁上, 优选在碗底附近开 有通孔( 105 ) 。
8. 如权利要求 1至 4之任一项所述的煤粉浓缩装置, 其特征在 于, 所述后部分(101) 的出口边缘设有齿状结构 (106) 或者花 瓣状结构。
9. 如权利要求 1至 5之任一项所述的煤粉浓缩装置, 其特征在 于, 所述后部分(101) 的筒状结构的壁上开有通孔。
10. 如权利要求 1至 5之任一项所述的煤粉浓缩装置, 其特征 在于, 在所述后部分 ( 101 ) 的内侧或外侧设有一个附加筒 (108) , 在该附加筒 (108) 与所述后部分 (101) 的筒状结构之 间形成一个夹层 (110) 。
11. 如权利要求 1至 5之任一项所述的煤粉浓缩装置, 其特征 在于, 设有前部分 ( 102, 102,) 和后部分 (101, 101,) 的多级 组合结构, 前一级结构的后部分 (101 ) 与后一级结构的前部分 ( 102' )依次嵌套在一起。
12. 一种煤粉燃烧器, 其特征在于, 它包括如权利要求 1至 11 之任一项所述的煤粉浓缩装置。
13. 如权利要求 12所述的煤粉燃烧器, 其特征在于, 它还包括 至少一级燃烧筒和点火源。
14. 如权利要求 13所述的煤粉燃烧器, 其特征在于, 所述点火 源伸入到所述煤粉浓缩装置的碗状结构内, 和 /或所述煤粉浓缩装 置的出口、 即所述后部分(101 ) 的筒状结构的出口伸入到第一级 燃烧筒 (201 ) 中。
15. 如权利要求 13或 14所述的煤粉燃烧器, 其特征在于, 所 述点火源为等离子发生器 (301 ) , 所述等离子发生器 (301 ) 与 所述前部分 ( 102 ) 的碗底口 ( 103 ) 的距离 ( L3 ) 为 10 ~ 100mm。
PCT/CN2010/000354 2009-03-24 2010-03-23 煤粉浓缩装置和包含该煤粉浓缩装置的煤粉燃烧器 WO2010108386A1 (zh)

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US8555795B2 (en) 2013-10-15
US20120006238A1 (en) 2012-01-12
RU2490544C2 (ru) 2013-08-20

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