WO2019114138A1 - 烟气混合装置及方法 - Google Patents

烟气混合装置及方法 Download PDF

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Publication number
WO2019114138A1
WO2019114138A1 PCT/CN2018/078127 CN2018078127W WO2019114138A1 WO 2019114138 A1 WO2019114138 A1 WO 2019114138A1 CN 2018078127 W CN2018078127 W CN 2018078127W WO 2019114138 A1 WO2019114138 A1 WO 2019114138A1
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Prior art keywords
section
flue gas
flue
mixing device
ring
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PCT/CN2018/078127
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English (en)
French (fr)
Inventor
朱廷钰
徐文青
李超群
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中国科学院过程工程研究所
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Application filed by 中国科学院过程工程研究所 filed Critical 中国科学院过程工程研究所
Priority to EP18889689.8A priority Critical patent/EP3666372A4/en
Priority to JP2020503915A priority patent/JP7078708B2/ja
Publication of WO2019114138A1 publication Critical patent/WO2019114138A1/zh

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F27D17/004—Systems for reclaiming waste heat
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/30—Injector mixers
    • B01F25/31—Injector mixers in conduits or tubes through which the main component flows
    • B01F25/312—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/10—Mixing gases with gases
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/30—Injector mixers
    • B01F25/31—Injector mixers in conduits or tubes through which the main component flows
    • B01F25/312—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof
    • B01F25/3124—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof characterised by the place of introduction of the main flow
    • B01F25/31242—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof characterised by the place of introduction of the main flow the main flow being injected in the central area of the venturi, creating an aspiration in the circumferential part of the conduit
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/30—Injector mixers
    • B01F25/31—Injector mixers in conduits or tubes through which the main component flows
    • B01F25/314—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced at the circumference of the conduit
    • B01F25/3142—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced at the circumference of the conduit the conduit having a plurality of openings in the axial direction or in the circumferential direction
    • B01F25/31425—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced at the circumference of the conduit the conduit having a plurality of openings in the axial direction or in the circumferential direction with a plurality of perforations in the axial and circumferential direction covering the whole surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/20—Measuring; Control or regulation
    • B01F35/21—Measuring
    • B01F35/2132—Concentration, pH, pOH, p(ION) or oxygen-demand
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/20—Measuring; Control or regulation
    • B01F35/22—Control or regulation
    • B01F35/2201—Control or regulation characterised by the type of control technique used
    • B01F35/2202—Controlling the mixing process by feed-back, i.e. a measured parameter of the mixture is measured, compared with the set-value and the feed values are corrected
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B21/00—Open or uncovered sintering apparatus; Other heat-treatment apparatus of like construction

Definitions

  • the present disclosure relates to the field of gas mixing technology, for example, to a flue gas mixing device and method.
  • the sintering flue gas circulation process refers to a sintering method in which a part of the heat transfer gas discharged from the sintering process is returned to the trolley after the sintering igniter is recycled.
  • the sintering flue gas circulation process in the related art all proposes that in the flue gas circulation, in order to ensure the quality of the sintered mineral, it is necessary to ensure that the circulating flue gas contains sufficient oxygen, so in the process design, the exhaust gas generated by the ring cooler is usually used to supplement. The oxygen content in the sintered flue gas.
  • FIG. 1 is a typical process flow diagram of a flue gas cycle in the related art.
  • the apparatus shown in FIG. 1 includes a ring cooler 1', a ring cold circulation fan 11', a flue gas mixer 2', and a flue gas seal cover 31'.
  • the working process of the sintering process, the sintering flue gas treatment process and the flue gas circulation process is as follows: the material is sintered in the sintering machine 32', and the sintered hot ore removed by the sintering machine 32' is cooled by the ring cooler 1' to produce ring cooling. After the exhaust gas and the ring-cooled exhaust gas are pressurized by the ring cooling circulation fan 11', they are combined with the circulating flue gas taken from the sintering machine 32' by the sintering cycle fan 41' to enter the flue gas mixer 2', and further pass through The flue gas seal cover 31' above the sintering machine 32' enters the sintering machine 32'.
  • the ring cold circulation fan and the flue gas mixer jointly realize the mixing of the ring cold exhaust gas and the circulating flue gas, and the air replenishment is mostly achieved by providing a vent valve on the flue gas sealing cover.
  • the flue gas mixing device in the related art has the following problems, such as a mixing device of a three-way flue, due to the flue and its elbow The space is limited.
  • problems such as airflow vortex vortex, flue wear, ash accumulation and poor mixing effect, and even airflow back suction, resulting in increased vibration of the flue gas circulation fan and unstable stall.
  • the mixing device of the multi-mixing chamber and the mixing device of the variable-diameter mixing cylinder can fully mix the flue gas, but neither of them is suitable for the flue gas with a large dust content.
  • a smoke mixing device with low resistance and convenient regulation of flue gas composition and flue gas temperature, stable flue gas flow, avoiding flue dust and abrasion, and protection of fans and auxiliary flue gases is designed.
  • the stable and efficient operation of the gas cycle process is of great significance.
  • the flue gas circulation process in the related art directly replenishes air from the sealing cover. Since the sealing cover has a large space, the gas in the sealing cover is sucked into the sintering bed to participate in the combustion reaction in a short residence time, so There is a problem that the oxygen is not uniformly mixed in the circulating flue gas, that is, the oxygen content is high in a region close to the air inlet, and the oxygen content is low in a region far from the air inlet (also called a low oxygen dead zone), and the low oxygen dead zone is There is a great disadvantage to sintering production. Therefore, it is also the key to improve the stability of the flue gas circulation process by rationally technical means that the oxygen carried by the supplemented air is uniformly mixed in the circulating flue gas.
  • a flue gas mixing device comprising:
  • the throat section side wall ring is provided with a plurality of air inlet holes
  • the angle between the axis of the intake aperture and the axis of the throat section is between 20 and 90 degrees.
  • the angle between the axis of the annular cold exhaust manifold and the axis of the throat section is between 15 and 75 degrees.
  • the cross-section of the annular cavity is a trapezoidal structure, and the corners of the trapezoidal structure have a curved transition surface.
  • the air branch pipe and the control assembly are further included, and the angle between the axis of the air branch pipe and the axis of the throat section is 30° to 90°; the air branch pipe includes an electric valve, and the electric valve is electrically connected to the control component.
  • the method further includes an oxygen content monitor disposed on the flue outlet section, the oxygen content monitor being electrically coupled to the control assembly.
  • the ash hopper is disposed at the bottom of the flue outlet section.
  • the diameter of the flue outlet section is greater than the diameter of the flue inlet section.
  • a method of mixing flue gas comprising:
  • the ring cold exhaust gas passes through the loop chamber and the intake hole in turn, and is mixed with the flue gas to form a mixed gas.
  • the method further includes: monitoring an oxygen content of the mixed gas;
  • the amount of intake air entering the air in the loop chamber is adjusted in real time.
  • the flue gas mixing device and method of the present disclosure solves the problems of high energy consumption and poor mixing effect of the flue gas mixing device in the related art.
  • FIG. 1 is a schematic view showing a process flow of a sintering flue gas circulation of the related art
  • FIG. 2 is a top plan view of a flue gas mixing device according to an embodiment
  • Figure 3 is a front elevational view of a flue gas mixing device according to an embodiment
  • FIG. 4 is a schematic view showing a process flow of a sintering flue gas circulation process according to an embodiment
  • FIG. 5 is a flow chart of a method for mixing flue gas provided by an embodiment.
  • FIG. 2 is a top view of a flue gas mixing device according to an embodiment (the air branch pipe is not shown), and the main body of the flue gas mixing device is a venturi pipe structure, and sequentially follows the flow of the flue gas.
  • a flue inlet section 11, a constricted section 21, a throat section 22, a flared section 23 and a flue outlet section 12 are provided.
  • the air inlet hole 221 is evenly and obliquely disposed on the circumferential side wall of the throat section 22, and the circumferential direction of the throat section 22 extends outwardly with a ring cavity 3, and the annular cavity 3 covers the entire throat section 22
  • the outside of the annular chamber 3 is formed with a space for containing gas.
  • the cross section of the annular cavity 3 may be a circular structure or a trapezoidal structure.
  • the cross-section of the annular cavity 3 is a trapezoidal structure.
  • the corner of the trapezoidal structure has a curved transition surface, so that the annular cavity 3 does not exist. The ash is dead to ensure that the airflow into the inside of the annular chamber 3 is unobstructed and the ash accumulation on the inner wall of the annular chamber 3 can be prevented.
  • the annular cavity 3 extends outwardly to form a ring-shaped cold exhaust gas branch pipe 31, and the air inlet hole 221 is communicated with the annular cavity 3 and the annular cold exhaust gas branch pipe 31; and the annular cold exhaust gas branch pipe 31 is also disposed obliquely on the annular cavity 3,
  • the design allows the cold exhaust gas to enter the annular cavity 3 from the annular cold exhaust pipe branch 31, and then enters the main passage of the flue gas through the air inlet hole 221 uniformly and obliquely distributed on the circumferential side wall of the throat section 22, thereby realizing the throat.
  • the mouth section 22 is uniformly aired throughout the week, and the buffering and voltage regulation of the incoming flue gas is also realized, and the annular cavity 3 and the main passage of the flue gas form a stable pressure difference, and the flow field of the main passage of the flue gas is maintained. Uniform and stable.
  • the intake air of all the air inlets 221 of the throat section 22 is fully utilized, and when the cold air exhaust gas passes through the air inlet hole 221, acceleration is generated, and the inflow can also be realized. The drainage of smoke.
  • FIG. 3 is a front view of a flue gas mixing device according to an embodiment (the ring cold exhaust gas branch pipe is not shown), and an air branch pipe 32 is disposed on the ring cavity 3, and the air branch pipe 32 is provided.
  • An electric valve 33 is mounted at the bottom to control the intake of the air branch pipe 32.
  • An oxygen level monitor 14 is provided at the top of the flue outlet section 12 to monitor the oxygen content in the flue gas after mixing in real time; the probe of the oxygen content monitor 14 extends to the center of the flue outlet section 12 to ensure The oxygen content of the mixed flue gas is measured more accurately.
  • the flue gas mixing device is also provided with a control assembly 34, the oxygen content monitor 14 is electrically coupled to the control assembly 34, and the oxygen content monitor 14 feeds back the results of the detected oxygen content to the control assembly 34, which controls the air manifold 32.
  • the opening of the electric valve 33 ensures a sufficient supply of sintered oxygen.
  • the outside of the main body of the flue gas mixing device is subjected to heat preservation treatment, and the opening degree of the electric valve 33 of the air branch pipe 32 is adjusted in time.
  • the diameter of the flue outlet section 12 is larger than the diameter of the flue inlet section 11, and a hopper 13 is provided at the bottom of the flue outlet section 12, so that the mixed flue gas can be collected and the flow rate is reduced due to the larger diameter of the flue gas. So that some of the dust settles due to gravity, thereby effectively avoiding the accumulation of dust and abrasion of the flue.
  • the angle between the axis of the intake hole 221 and the axis of the throat section 22 is 20° to 90°; the angle between the axis of the annular cold exhaust branch pipe 31 and the axis of the throat section 22 is 15° to 75°. °; the angle between the axis of the air branch pipe 32 and the axis of the throat section 22 is 30 ° ⁇ 90 °.
  • FIG. 4 is a schematic view showing a process flow of a sintering flue gas circulation process according to an embodiment. As shown in FIG. 2 to FIG. 4, the working principle of the sintering flue gas circulation process is:
  • the material is sintered in the sintering machine 3b, and the sintered hot ore removed by the sintering machine 3b is cooled by the ring cooler 1 to produce a ring-cooled exhaust gas, and the circulating flue gas taken from the first end of the sintering machine 3b and pressurized by the sintering cycle fan 41. And entering the flue gas mixing device together, and entering the sintering machine 3b through the flue gas sealing cover 3a located at the head of the sintering machine 3b.
  • the circulating flue gas after the circulating flue gas is pressurized by the sintering circulation fan 41, it flows through the flue gas mixing device mainly composed of the classic venturi structure, and a negative pressure can be generated at the throat section 22, and the circulating cold exhaust gas is
  • the original blower (not shown) of the ring cooler 1 is pushed into the annular cavity 3 by the ring cold exhaust pipe branch 31, and is sucked into the throat section 22 by the intake hole 221 under the action of the negative pressure.
  • the pressure difference between the two fluids is utilized to sufficiently mix the introduced ring cold exhaust gas with the incoming flue gas.
  • the present embodiment does not require the ring cold circulation fan 11, It can effectively realize the thorough mixing of the ring cold exhaust gas and the circulating flue gas, and can also effectively homogenize the flue gas component and the flue gas temperature and stabilize the flue gas flow in the sintering flue gas circulation process.
  • the air branch pipe 32 is disposed obliquely on the throat section 22, and the air branch pipe 32 can also adjust and replenish air at any time according to the change of the oxygen content in the flue outlet section 12 after mixing.
  • FIG. 5 is a flow chart of a method for mixing flue gas according to an embodiment. As shown in FIG. 5, the method for mixing flue gas includes steps 110-130:
  • step 110 flue gas is introduced into the flue inlet section.
  • step 120 a ring-cooled exhaust gas is passed to the ring-cooled exhaust gas branch pipe.
  • step 130 the ring-cooled exhaust gas passes through the annular cavity and the intake hole in sequence, and is mixed with the flue gas to form a mixed gas.
  • the method for mixing flue gas further comprises: monitoring an oxygen content of the mixed gas;
  • the amount of air intake into the loop chamber is adjusted in real time based on the oxygen content.
  • the flue gas mixing device of the present disclosure solves the problems of high energy consumption of the flue gas mixing device and poor mixing effect of the flue gas in the related art.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
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Abstract

一种烟气混合装置及方法，包括：依次连通的烟道入口段（11）、喉口段（22）和烟道出口段（12），喉口段（22）的侧壁环设有多个进气孔（221），且喉口段（22）的外周设置有环道腔（3），环道腔（3）连接有环冷废气支管（31）；缩口段（21），缩口段（21）连接在烟道入口段（11）与喉口段（22）之间；以及扩口段（23），扩口段（23）连接在喉口段（22）与烟道出口段（12）之间。

Description

烟气混合装置及方法 技术领域
本公开涉及气体混合技术领域，例如涉及一种烟气混合装置及方法。
背景技术
烧结烟气循环工艺，是指将烧结过程排出的一部分载热气体返回烧结点火器以后的台车上再循环使用的一种烧结方法。相关技术中的烧结烟气循环工艺均提出，在烟气循环中为保证烧结矿产质量，应保证循环烟气中含有充足的氧气，因此在工艺设计中通常利用环冷机产生的废气，来补充烧结烟气中的氧气含量。
图1为相关技术中的烟气循环典型的工艺流程图，图1所示的设备有：环冷机1′、环冷循环风机11′、烟气混合器2′、烟气密封罩31′、烧结机32′、除尘器4′、烧结循环风机41′、烧结主抽风机42′、脱硫塔5′、烟囱6′及连接设备之间的管路。上述烧结工序、烧结烟气处理工序和烟气循环工艺的工作过程为：物料在烧结机32′中进行烧结，烧结机32′卸下的烧结热矿经环冷机1′冷却后产生环冷废气，环冷废气经环冷循环风机11′加压后，与取自烧结机32′经烧结循环风机41′增压的循环烟气，共同进入烟气混合器2′中，并进一步通过位于烧结机32′上方的烟气密封罩31′进入烧结机32′。烧结机32′产生的大部分烟气(非循环烟气)通过除尘器4′，经烧结主抽风机42′加压输送至脱硫塔5′和烟囱6′，最后排出。其中环冷循环风机和烟气混合器联合实现环冷废气和循环烟气的混合，而空气的补充多通过在烟气密封罩上设置通气阀实现。
同时，由于需要混合的两股烟气的压力、温度、流量和成分等均不同，相关技术中的烟气混合装置存在以下问题，如三通烟道的混合装置，由于烟道及其弯头的空间有限，在两股气流混合过程中存在气流折冲涡旋、烟道磨损、积灰和混合效果差等问题，甚至会发生气流倒吸，导致烟气循环风机振动加剧以及失速不稳等工况事故；而多混合腔的混合装置及变径混合筒的混合装置虽然可以充分混合烟气，但是二者均不适于含尘量大的烟气。因此，设计出一种低阻力且能便捷调控烟道烟气成分和烟气温度、稳定烟气流量、避免烟道积灰和磨损、保护风机及附属烟道等设备的烟气混合装置对烟气循环工艺的稳定和高效运行意义重大。
同时相关技术中的烟气循环工艺是从密封罩中直接补充空气，由于密封罩空间大，密封罩内的气体在较短的停留时间内就会被吸入烧结床层参加燃烧反应，因此这种方式存在氧气在循环烟气混合不均匀的问题，即在靠近空气进口的区域氧气含量较高，而远离空气进口的区域氧气含量低(又称低氧死区)，这种低氧死区的存在对烧结生产十分不利。因此，通过合理技术手段使得补充进入的空气所携带的氧气在循环烟气中混合均匀也是提高烟气循环工艺稳定的关键所在。
发明内容
本公开提供一种烟气混合装置及方法，可以解决相关技术的烟气混合装置能耗高和烟气混合效果不佳的问题。一种烟气混合装置，包括：
烟道入口段；
喉口段，所述喉口段侧壁环设有多个进气孔；
在喉口段的外周设置的环道腔；
与环道腔连接的环冷废气支管；
烟道出口段；
缩口段，所述缩口段连接在烟道入口段与喉口段之间；
扩口段，所述扩口段连接在喉口段与烟道出口段之间。
在一实施例中，进气孔轴线与喉口段轴线的夹角为20°～90°。
在一实施例中，环冷废气支管轴线与喉口段轴线的夹角为15°～75°。
在一实施例中，环道腔的截面为梯形结构，且梯形结构的角部具有弧形过渡面。
在一实施例中，还包括空气支管和控制组件，空气支管轴线与喉口段轴线的夹角为30°～90°；空气支管包括电动阀门，电动阀门与控制组件电连接。
在一实施例中，还包括，设置在烟道出口段上的氧含量监测器，氧含量监测器与控制组件电连接。
在一实施例中，还包括，设置在烟道出口段底部的灰斗。
在一实施例中，烟道出口段的直径大于烟道入口段的直径。
一种烟气混合方法，包括：
向烟道入口段通入烟气；
向环冷废气支管通入环冷废气；
环冷废气依次通过环道腔和进气孔后，与烟气混合形成混合气体。
在一实施例中，在所述环冷废气与所述烟气混合之后，还包括：对混合气体的氧气含量进行监测；以及
根据所述氧气含量，实时调整进入环道腔内的空气的进气量。
本公开的烟气混合装置及方法，解决了相关技术中的烟气混合装置能耗高和烟气混合效果不佳的问题。
附图说明
图1是相关技术烧结烟气循环工艺流程示意图；
图2是一实施例提供的烟气混合装置的俯视图；
图3是一实施例提供的烟气混合装置的主视图；
图4是一实施例提供的烧结烟气循环工艺的工艺流程示意图；
图5是一实施例提供的烟气混合方法流程图。
图中：
1′、环冷机；11′、环冷循环风机；2′、烟气混合器；31′、烟气密封罩；32′、烧结机；4′、除尘器；41′、烧结循环风机；42′、烧结主抽风机；5′、脱硫塔；6′、烟囱；
1、环冷机；3a、烟气密封罩；3b、烧结机；4、除尘器；41、烧结循环风机；42、烧结主抽风机；5、脱硫塔；6、烟囱；
11、烟道入口段；12、烟道出口段；13、灰斗；14、氧含量监测器；
21、缩口段；22、喉口段；23、扩口段；221、进气孔；
3、环道腔；31、环冷废气支管；32、空气支管；33、电动阀门；34、控制组件。
具体实施方式
如图2所示，图2是一实施例提供的一种烟气混合装置的俯视图(图中未示出空气支管)，烟气混合装置的主体为文丘里管结构，且沿烟气流向依次设置有烟道入口段11、缩口段21、喉口段22、扩口段23和烟道出口段12。进气孔221均匀且倾斜地环设于喉口段22的周向侧壁上，喉口段22的周向向外延伸有环道腔3，环道腔3包覆于整个喉口段22的外部，环道腔3内部形成有容纳气体的空间。环道腔3的截面可以为圆形结构，也可以为梯形结构。示例性的， 本实施例中，环道腔3的截面为梯形结构，当环道腔3的截面为梯形结构时，梯形结构的角部具有弧形过渡面，使得环道腔3内不存在积灰死角，以保证进入环道腔3内部的气流通畅且能够防止环道腔3内壁的积灰。
环道腔3向外延伸形成有环冷废气支管31，进气孔221均与环道腔3和环冷废气支管31连通；并且环冷废气支管31也是倾斜设置于环道腔3上，如此设计，可使得环冷废气先从环冷废气支管31进入环道腔3，再通过均匀且倾斜分布于喉口段22周向侧壁的进气孔221进入烟气主通道，进而实现了喉口段22全周较均匀地进气，也实现了对来流烟气的缓冲和稳压，并使环道腔3与烟气主通道形成稳定压差，维持了烟气主通道流场的均匀稳定。可选地，通过利用环道腔3内充满环冷废气，充分利用喉口段22的所有进气孔221进气，当环冷废气通过进气孔221时产生加速，还能实现对来流烟气的引流作用。此外，喉口段22上的进气孔221倾斜设置，能够使环冷废气以预设角度与来流烟气汇流，避免了环冷废气对来流烟气的直接冲击，从而减小对来流烟气流动的影响，且减少了引入气体和来流烟气的碰撞损失。如图3所示，图3是一实施例提供的一种烟气混合装置的主视图(图中未示出环冷废气支管)，在环道腔3上设置有空气支管32，空气支管32的底部安装有电动阀门33，以控制空气支管32进气。在烟道出口段12的顶部设有氧含量监测器14，以实时监测混合后烟气中的氧气含量；氧含量监测器14的探头延伸至烟道出口段12的中心位置处，可以保证能够更准确地对混合后烟气的氧气含量进行测量。烟气混合装置还设置有控制组件34，氧含量监测器14与控制组件34电连接，氧含量监测器14将检测到的氧含量的结果反馈给控制组件34，控制组件34调节空气支管32中电动阀门33的开度，以保证烧结氧气的充分供应。可选地，为减少烟气循环过程中的热损失，烟气混合装置的主体外部进行保温处理，并适时调节空气支管32的电动阀门33的开度。烟道出口段12的直径比烟道入口段11的直径要大，在烟道出口段12的底部设置有灰斗13，可以收集混合烟气经扩口段23后因管径变大流速降低，使部分粉尘因重力而沉降，从而有效地避免了烟道的积灰和磨损。
如图2和图3所示，进气孔221轴线与喉口段22轴线的夹角为20°～90°；环冷废气支管31轴线与喉口段22轴线的夹角为15°～75°；空气支管32轴线与喉口段22轴线的夹角为30°～90°。通过对引入气体的进气结构进行倾斜设置，可以避免引入气体对来流烟气的直接冲击，同时对来流烟气起到引流作用，维持了烟气主通道流场的均匀稳定，减少了引入气体和来流烟气的碰撞损失。 其中，环冷废气支管31以一定角度倾斜地接入环道腔3中，可以更加方便环冷废气支管31与环道腔3连通。
图4为一实施例提供的烧结烟气循环工艺的工艺流程示意图，如图2至图4所示，烧结烟气循环工艺工作原理是：
物料在烧结机3b中进行烧结，烧结机3b卸下的烧结热矿经环冷机1冷却后产生环冷废气，与取自烧结机3b首尾部且经烧结循环风机41增压的循环烟气，共同进入烟气混合装置中，并通过位于烧结机3b机头的烟气密封罩3a进入烧结机3b。烧结机3b产生的大部分烟气(非循环烟气)通过除尘器4，经烧结主抽风机42加压输送至脱硫塔5和烟囱6，最后排出。
本实施例中，循环烟气经烧结循环风机41加压后，经由经典文丘里管结构为主体的烟气混合装置内流过，可以在喉口段22处产生负压，而环冷废气在环冷机1原有的鼓风机(图中未示出)推动下由环冷废气支管31进入环道腔3内，在负压的作用下由进气孔221被吸入喉口段22的来流烟气中，并利用两种流体的压强差使引入的环冷废气与来流烟气进行充分掺混，相比于相关技术中的烧结烟气循环工艺，本实施例无需环冷循环风机11，即可有效地实现环冷废气和循环烟气的充分混合，也能有效均化烧结烟气循环工艺中烟道烟气成分和烟气温度、稳定烟气流量。此外，在喉口段22上倾斜设置的空气支管32，空气支管32也能够根据混合后烟道出口段12中氧含量变化，随时调控并补充空气。
图5为一实施例提供的烟气混合方法流程图，如图5所示，该烟气混合方法包括步骤110-130：
在步骤110中，向烟道入口段通入烟气。
在步骤120中，向环冷废气支管通入环冷废气。
在步骤130中，环冷废气依次通过环道腔和进气孔后，与烟气混合形成混合气体。
可选地，该烟气混合方法还包括：对混合气体的氧气含量进行监测；以及
根据氧气含量，实时调整进入环道腔内的空气进气量。
工业实用性
本公开的烟气混合装置，解决了相关技术中的烟气混合装置能耗高和烟气混合效果不佳的问题。

Claims (10)

  1. 一种烟气混合装置，包括：
    烟道入口段(11)；
    喉口段(22)，所述喉口段(22)侧壁环设有多个进气孔(221)；
    在所述喉口段(22)的外周设置的环道腔(3)；
    与所述环道腔(3)连接的环冷废气支管(31)；
    烟道出口段(12)；
    缩口段(21)，所述缩口段(21)连接在所述烟道入口段(11)与所述喉口段(22)之间；以及
    扩口段(23)，所示扩口段(23)连接在所述喉口段(22)与所述烟道出口段(12)之间。
  2. 根据权利要求1所述的烟气混合装置，其中，所述进气孔(221)轴线与所述喉口段(22)轴线的夹角为20°～90°。
  3. 根据权利要求1所述的烟气混合装置，所述环冷废气支管(31)轴线与所述喉口段(22)轴线的夹角为15°～75°。
  4. 根据权利要求3所述的烟气混合装置，其中，所述环道腔(3)的截面为梯形结构，且所述梯形结构的角部具有弧形过渡面。
  5. 根据权利要求1所述的烟气混合装置，还包括空气支管(32)和控制组件(34)，所述空气支管(32)轴线与所述喉口段(22)轴线的夹角为30°～90°；所述空气支管(32)包括电动阀门(33)，所述电动阀门(33)与所述控制组件(34)电连接。
  6. 根据权利要求5所述的烟气混合装置，还包括：设置在所述烟道出口段(12)上的氧含量监测器(14)，所述氧含量监测器(14)与所述控制组件(34)电连接。
  7. 根据权利要求6所述的烟气混合装置，还包括：设置在所述烟道出口段(12)底部的灰斗(13)。
  8. 根据权利要求1～7中任一项所述的烟气混合装置，其中，所述烟道出口段(12)的直径大于所述烟道入口段(11)的直径。
  9. 一种利用如权利要求1～8中任一项所述的烟气混合装置的烟气混合方法，包括：
    向所述烟道入口段(11)通入烟气；
    向所述环冷废气支管(31)通入环冷废气；
    所述环冷废气依次通过所述环道腔(3)和所述进气孔(211)后，与所述烟气混合形成混合气体。
  10. 根据权利要求9所述的烟气混合方法，在所述环冷废气与所述烟气混合之后，还包括：对所述混合气体的氧气含量进行监测；以及
    根据所述氧气含量，实时调整进入所述环道腔(3)内的空气进气量。
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