WO2009094817A1 - Brûleur pour brûler uniquement un gaz de haut fourneau ou un gaz faiblement calorifique - Google Patents

Brûleur pour brûler uniquement un gaz de haut fourneau ou un gaz faiblement calorifique Download PDF

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Publication number
WO2009094817A1
WO2009094817A1 PCT/CN2008/001056 CN2008001056W WO2009094817A1 WO 2009094817 A1 WO2009094817 A1 WO 2009094817A1 CN 2008001056 W CN2008001056 W CN 2008001056W WO 2009094817 A1 WO2009094817 A1 WO 2009094817A1
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WO
WIPO (PCT)
Prior art keywords
gas
pipe
air
burner
blast furnace
Prior art date
Application number
PCT/CN2008/001056
Other languages
English (en)
Chinese (zh)
Inventor
Shunkang Yu
Original Assignee
Shanghai Boiler Works 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 Shanghai Boiler Works Co., Ltd filed Critical Shanghai Boiler Works Co., Ltd
Publication of WO2009094817A1 publication Critical patent/WO2009094817A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/20—Non-premix gas burners, i.e. in which gaseous fuel is mixed with combustion air on arrival at the combustion zone
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C7/00—Combustion apparatus characterised by arrangements for air supply
    • F23C7/002—Combustion apparatus characterised by arrangements for air supply the air being submitted to a rotary or spinning motion
    • F23C7/004—Combustion apparatus characterised by arrangements for air supply the air being submitted to a rotary or spinning motion using vanes

Definitions

  • the invention relates to a burner and a combustion method for purely burning blast furnace gas or low calorific value gas, which are used for
  • the thermal power of a single burner is 4. 0MW ⁇ 30. 0MW, to meet the requirements of large-scale high-parameter combustion blast furnace gas and other low-calorific value gas boilers, belonging to Boiler burner technology field.
  • the output of blast furnace gas and low calorific value gas produced in the metallurgical process is greatly improved, and the calorific value of blast furnace gas or low calorific value gas is getting lower and lower.
  • the average calorific value of blast furnace gas was about 4180 kJ/m 3 .
  • the average calorific value of blast furnace gas was reduced to 3135 kJ/m 3 .
  • the co-firing method that is, mixing with coke oven gas or converter gas to increase the calorific value, about 50% of the internal process of the steel enterprise is used, and nearly half of the blast furnace gas cannot be effectively utilized and released.
  • the blasted blast furnace gas not only pollutes the environment, but also wastes energy.
  • blast furnace gas is used as fuel because its calorific value is very low, and the stability of combustion is the key to limiting its conversion and utilization.
  • the angle of installation of the blades used in the burner was less than 40 degrees by the method of mixing with coal in the pulverized coal furnace.
  • the difference in thermal characteristics between the blast furnace gas or the low calorific value gas and the pulverized coal was too large.
  • Calorific calculation Blast furnace gas and low calorific value gas are acceptable. Exceeding a certain amount will seriously affect the operating parameters and safety and economics of the boiler. Summary of the invention
  • An object of the present invention is to provide a burner and a combustion method for a purely blasted blast furnace coal gas or a low calorific value gas gas having a strong stabilizing ability for a power station boiler.
  • the technical proposal of the present invention is to provide a burner for purely burning blast furnace gas or low calorific value gas, which is characterized in that: a gas pipe, an air pipe, a gas blade, an air blade, a zoom flare, an ignition air gun,
  • the high-energy igniter consists of a nozzle of the air inlet pipe connected with the zoom flare, the gas inlet pipe is arranged in the air inlet pipe, and the gas inlet pipe is concentric, the ignition air gun and the high-energy ignition gun are arranged in the central pipe of the gas pipe, in the gas pipe At the nozzle of the air pipe, an axial or tangential gas blade is evenly arranged between the gas pipe and the central pipe, and an axial or tangential air blade is evenly arranged between the gas pipe and the air pipe.
  • the gas blades are 8-25 pieces, the installation angle of the gas blades is 45 degrees to 70 degrees; the air blades are 10-30 pieces, and the installation angle of the air blades is 45 degrees to 70 degrees.
  • the invention relates to a method for burning a burner of purely blast furnace gas or low calorific value gas, characterized in that a corresponding burner is arranged on the front and rear walls of the boiler furnace, and the front and rear wall is used for the combustion technology, - the gas outlet speed is 15 ⁇ 40 m/s, air outlet speed is 20 ⁇ 60 m/s.
  • the burner of the invention adopts a double swirling structure of gas and air, and an ignition device is arranged at the center, and the rotation of the gas and the air is achieved by axially or tangentially guiding the blades, and a corresponding burner is arranged on the front and rear walls of the furnace.
  • the front and rear wall hedging combustion technology is used to generate a double-swirl plane flame, and the purpose of intensifying combustion and stabilizing the flame is achieved by the rotation of the jet to achieve safe, economical and efficient combustion of the blast furnace gas or the low calorific value gas.
  • the burner forcibly rotates the jet by axial or tangential guidance before the jet leaves the nozzle.
  • a stationary surface The medium expands and rotates forward to form a rotating jet.
  • the rotating jet enters the large space of the furnace from the burner nozzle and is no longer free to expand by the wall of the passage.
  • the strong rotating jet flow field generally contains two recirculation zones, namely the outer recirculation zone and the central recirculation zone.
  • the outer recirculation zone is a recirculation zone where the rotating jet strongly entrains the outer medium and forms at the jet boundary. From the perspective of tissue combustion, the outer recirculation zone can ensure that the jet has a suitable expansion angle, and can heat the burner outlet flow through the reflux of high-temperature flue gas, which plays a role in the ignition and stable combustion.
  • a central recirculation zone appears inside the rotating jet.
  • the high-temperature flue gas that has started to burn downstream of the flow field is drawn to the vicinity of the burner outlet to directly ignite the outlet gas flow.
  • the preheating process, pyrolysis process, volatile matter and combustion of fixed carbon and the formation of contaminants in the initial stage of fuel ignition are mainly carried out in the vicinity of the central recirculation zone and its boundary. So in comparison, the central recirculation zone plays a more important role in the combustion process.
  • the characteristics of the central recirculation zone are important for fuel ignition and flame stabilization. Both closed and fully open airflow are not ideal for airflow construction from a combustion and safety perspective.
  • the former's recirculation zone is too small, and it has less effect on fire and steady combustion. Although the latter has a large recirculation zone, the reflow rate is low, and the amount of high-temperature flue gas is not much, and the flame wall is easy to burn the nozzle, resulting in Slagging.
  • the open rotary airflow structure is ideal in terms of combustion stability and operational safety.
  • the technical point of the present invention is to achieve the desired open-ended rotary gas by optimizing the design of the burner, including optimizing the geometry of the burner outlet rim and optimizing the gas and air velocity at the burner outlet.
  • the flow structure obtains reasonable technical parameters such as the length of the recirculation zone, the width of the recirculation zone, the reflux velocity and the reflux rate.
  • An advantage of the present invention is that it can make full use of the blast furnace gas that was originally released and cannot be effectively utilized.
  • Figure 1 is a schematic view showing the structure of a burner for purely burning blast furnace gas or low calorific value gas
  • Figure 2 is a cross-sectional view taken along line A-A.
  • FIG. 1 and 2 it is a schematic diagram of a burner structure of purely blasted blast furnace gas or low calorific value gas, and the burner of the pure blast furnace gas or low calorific value gas is composed of a gas pipe 1, an air pipe 2,
  • the gas blade 3, the air blade 4, the zoom flare 5, the ignition air gun 6, the high-energy igniter 7 are composed, the spout of the air inlet pipe 2 is connected with the zoom flare 5, and the gas inlet pipe 1 is installed in the air inlet pipe 2, and the gas
  • the inlet pipe 1 is coaxial, the ignition air gun 6 and the high-energy igniter 7 are installed in the central pipe 8 of the gas pipe 1, and the gas pipe 1 and the air pipe 2 are evenly installed between the gas pipe 1 and the central pipe 8 8
  • the axial gas blade 3 is evenly installed with 10 axial air blades 4 between the gas pipe 1 and the air pipe 2, the installation angle of the gas blade 3 is 60 degrees, and the installation angle of the air blade 4 is 60 degrees.
  • the expansion angle of the zoom flare 5 is 60
  • one-to-one burners are arranged on the front and rear walls of the boiler hearth, using front and rear wall hedging combustion technology, the gas outlet speed is 35 m/s, the air outlet speed is 50 m/s, and the reinforcement is achieved by the rotation of the jet.
  • the purpose of burning and stabilizing the flame is to achieve safe, economical and efficient combustion of blast furnace gas and low calorific value gas.
  • the resulting burner outlet axial velocity distribution is substantially symmetrical at the center axis of the burner outlet and is generally "M" in the radial direction.
  • the axial velocity of the flow field near the central axis is negative, ie there is a significant recirculation zone, and the high velocity zone of the rotating jet is continuously expanding outward, resulting in a tangential velocity of the burner exit.
  • the distribution is roughly "N" in shape.
  • the absolute value of the tangential velocity in each section decreases continuously along the direction of the jet, and the tangential velocity field diffuses significantly near the exit.
  • recirculation zone shape and size provide a stable heat source for the ignition of the fuel gas stream. This is an important guarantee for the burner to have a strong stable combustion capacity.
  • the recirculation zone expansion angle of the burner is 30 degrees to 60 degrees, and there is a good.
  • the width and length of the recirculation zone which is beneficial for the entrainment of high temperature backflow flue gas, which is very good for ignition and stable combustion. Profitable.
  • the jet boundary obtained by the burner is obviously expanded outward.
  • the jet expansion angle is larger.
  • the jet expansion angle is slowed down, and the jet expansion angle is 50 degrees to 80 degrees. .

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combustion Of Fluid Fuel (AREA)

Abstract

L'invention concerne un brûleur destiné à brûler uniquement un gaz de haut fourneau ou un gaz faiblement calorifique, qui se caractérise en ce qu'il est constitué d'un tuyau à gaz (1), d'un tuyau à air (2), d'ailettes à gaz (3), d'ailettes à air (4), d'un diffuseur convergent-divergent (5), d'un allumeur de gaz (6) et d'un allumeur à haute énergie (7). La buse du tuyau à air (2) est connectée au diffuseur convergent-divergent (5). Le tuyau à gaz (1) est fixé dans le tuyau à air (2), lequel est coaxial au tuyau à gaz (1). L'allumeur de gaz (6) et l'allumeur à haute énergie (7) sont fixés dans un tuyau central (8) du tuyau à gaz (1). Au niveau des buses du tuyau à gaz (1) et du tuyau à air (2), les ailettes à gaz axiales ou tangentielles (3) sont uniformément fixées entre le tuyau à gaz (1) et le tuyau central (8). Les ailettes à air axiales ou tangentielles (4) sont uniformément fixées entre le tuyau à gaz (1) et le tuyau à air (2). Le procédé de combustion de ce brûleur se caractérise en ce que des brûleurs correspondant l'un par rapport à l'autre sont agencés sur les parois avant et arrière du fourneau, et la technologie de cuisson par parois avant et arrière opposées est adoptée.
PCT/CN2008/001056 2008-01-25 2008-05-30 Brûleur pour brûler uniquement un gaz de haut fourneau ou un gaz faiblement calorifique WO2009094817A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN200810033093.2 2008-01-25
CNA2008100330932A CN101220954A (zh) 2008-01-25 2008-01-25 一种纯烧高炉煤气或低热值煤气的燃烧器及燃烧方法

Publications (1)

Publication Number Publication Date
WO2009094817A1 true WO2009094817A1 (fr) 2009-08-06

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PCT/CN2008/001056 WO2009094817A1 (fr) 2008-01-25 2008-05-30 Brûleur pour brûler uniquement un gaz de haut fourneau ou un gaz faiblement calorifique

Country Status (2)

Country Link
CN (1) CN101220954A (fr)
WO (1) WO2009094817A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101832556B (zh) * 2010-06-03 2012-02-08 蓝星化工有限责任公司 一种以混合燃气为燃料的燃烧器
CN103486591B (zh) * 2013-09-04 2016-09-07 北京华清燃气轮机与煤气化联合循环工程技术有限公司 一种燃气轮机燃烧室防回火型喷嘴连接段组件
CN105042593A (zh) * 2015-08-27 2015-11-11 武汉奥杰科技股份有限公司 一种煤气燃烧系统
CN107763621B (zh) * 2017-11-22 2023-08-15 江汉大学 一种混合煤气点火放散装置
CN112775424B (zh) * 2020-12-11 2022-06-07 河钢股份有限公司承德分公司 一种中间包水口烘烤系统

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2123945A (en) * 1982-07-14 1984-02-08 Mitsui Shipbuilding Eng Method of burning low calorific gas and burner for low calorific gas
JPS60129517A (ja) * 1983-12-16 1985-07-10 Hitachi Zosen Corp ガスバ−ナ
CN2338618Y (zh) * 1998-08-09 1999-09-15 重庆钢铁设计研究院 一种高炉煤气烧嘴
CN2390101Y (zh) * 1999-07-06 2000-08-02 冶金工业部鞍山冶金设计研究院 一种燃烧高炉煤气用短焰型烧嘴
CN1086788C (zh) * 1997-04-15 2002-06-26 首钢总公司 全烧高炉煤气的高温高压电站锅炉
CN2544188Y (zh) * 2002-08-23 2003-04-09 郭玉伟 油田注汽锅炉及类似设备上所用低热值热煤气燃烧器

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2123945A (en) * 1982-07-14 1984-02-08 Mitsui Shipbuilding Eng Method of burning low calorific gas and burner for low calorific gas
JPS60129517A (ja) * 1983-12-16 1985-07-10 Hitachi Zosen Corp ガスバ−ナ
CN1086788C (zh) * 1997-04-15 2002-06-26 首钢总公司 全烧高炉煤气的高温高压电站锅炉
CN2338618Y (zh) * 1998-08-09 1999-09-15 重庆钢铁设计研究院 一种高炉煤气烧嘴
CN2390101Y (zh) * 1999-07-06 2000-08-02 冶金工业部鞍山冶金设计研究院 一种燃烧高炉煤气用短焰型烧嘴
CN2544188Y (zh) * 2002-08-23 2003-04-09 郭玉伟 油田注汽锅炉及类似设备上所用低热值热煤气燃烧器

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
ZHOU, ZHENHE: "The improvement of the nozzles of boiler blast furnace gas burners", METALLURGICAL POWER, no. 5, October 1993 (1993-10-01), pages 38 *

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