CN101175988B - Excess air control for cracker furnace burners - Google Patents

Excess air control for cracker furnace burners Download PDF

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Publication number
CN101175988B
CN101175988B CN 200680016536 CN200680016536A CN101175988B CN 101175988 B CN101175988 B CN 101175988B CN 200680016536 CN200680016536 CN 200680016536 CN 200680016536 A CN200680016536 A CN 200680016536A CN 101175988 B CN101175988 B CN 101175988B
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concentration
combustion gas
air
carbon monoxide
oxygen
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CN 200680016536
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Chinese (zh)
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CN101175988A (en )
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A·E·韦伯
C·J·雷德
C·W·利普
G·D·弗雷德里克
J·D·泰特
S·欧文
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陶氏环球技术公司
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00Investigating or analysing materials by the use of optical means, i.e. using infra-red, visible or ultra-violet light
    • G01N21/17Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/25Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
    • G01N21/31Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
    • G01N21/39Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using tunable lasers
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10GCRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
    • C10G9/00Thermal non-catalytic cracking, in the absence of hydrogen, of hydrocarbon oils
    • C10G9/14Thermal non-catalytic cracking, in the absence of hydrogen, of hydrocarbon oils in pipes or coils with or without auxiliary means, e.g. digesters, soaking drums, expansion means
    • C10G9/18Apparatus
    • C10G9/20Tube furnaces
    • C10G9/206Tube furnaces controlling or regulating the tube furnaces
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27FURNACES; KILNS; OVENS; RETORTS
    • F27DDETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D19/00Arrangements of controlling devices
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27FURNACES; KILNS; OVENS; RETORTS
    • F27DDETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D21/00Arrangements of monitoring devices; Arrangements of safety devices
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27FURNACES; KILNS; OVENS; RETORTS
    • F27DDETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D99/00Subject matter not provided for in other groups of this subclass
    • F27D99/0001Heating elements or systems
    • F27D99/0033Heating elements or systems using burners

Abstract

A method for control of the air/fuel ratio of the burner(s) (excess air) of a thermal cracker which includes three steps. The first step is to direct a wavelength modulated beam of near infrared light from a tunable diode laser through combustion gas from the burner to a near infrared light detector to generate a detector signal. The second step is to analyze the detector signal for spectroscopicabsorption at wavelengths characteristic for an analyte selected from the group consisting of oxygen, carbon monoxide and nitrogen oxide to determine the concentration of the analyte in the combustion gas. The third step is to adjust the air/fuel ratio of the burner(s) (excess air) in response to the concentration of the analyte of the second step.

Description

裂解炉燃烧器中过量空气的控制方法 Cracking furnace burners method of controlling the excess air

技术领域 FIELD

[0001] 本发明涉及一种在裂解炉燃烧器中控制过量空气的方法。 [0001] The present invention relates to a method of controlling cracking furnace excess air in the burner. 背景技术 Background technique

[0002] 通过热裂解(cracking)诸如石脑油等烃材料生产石蜡是化工过程工业(chemical process industry)最重要的过程之一。 [0002] Thermal cracking (Cracking) hydrocarbon materials such as naphtha paraffin production is one such chemical process industry (chemical process industry) The most important process. 例如,据报道,ABB公司在得克萨斯州的Port Arthur建造了每年产能100万吨以上乙烯和丙烯的裂解工厂。 For example, it was reported, ABB company in Port Arthur, Texas, built an annual production capacity of more than 1 million tons of ethylene and propylene cracker factory. 裂解过程在“裂解炉”中进行。 Cracking process carried out in the "cracker" in. 裂解炉通常由包含炉管和燃烧器(burner)的外罩(enclosure)组成。 Cracking furnace generally consists of a housing (Enclosure) comprising a burner and a furnace tube (Burner) a. 燃料燃烧产生的热量加热在炉管中流动的烃材料,烃材料热裂解产生乙烯、丙烯以及其他物质。 Heating the combustion heat of the fuel flowing in the hydrocarbon materials in a furnace tube, thermal cracking of hydrocarbon materials produce ethylene, propylene and other substances.

[0003] 通常,裂解炉包括一个辐射段和一个对流段。 [0003] Generally, the cracking furnace comprising a radiant section and a convection section. 燃烧器设置在辐射段,这样,置于辐射段内的炉管主要由与燃烧器相邻的炉壁散发出的辐射热加热。 Burners in the radiant section is provided, so that, disposed within the radiant section tubes emit mainly by the furnace wall adjacent to the burner radiant heat of the heating. 然后,从辐射段出来的燃烧气(combustion gas)被导入对流段,在这里,来自燃烧气的热量被回收用于加热放置于对流段的炉管。 Then, out of the radiant section of the combustion gas (combustion gas) is introduced into the convection section where heat is recovered from the combustion gas for heating the furnace tube is placed in the convection section. 氧气传感器,例如氧化锆氧气传感器,通常放置在裂解炉辐射段和对流段之间以便于控制燃烧器中的空气/燃料比。 Oxygen sensor, a zirconia oxygen sensor for example, is typically placed between the cracking furnace convection section and so as to control the air / fuel ratio in the burner. 裂解炉的总体效率主要是辐射室(firebox)中过量空气量以及裂解炉排出的废气的温度的函数。 The overall efficiency of the cracking furnace is mainly radiation chamber (Firebox) and the quantity of excess air in function of the temperature of the exhaust gas discharged from the cracking furnace. 从效率角度看,控制裂解炉中的空气量是有益的。 From the efficiency point of view, the amount of air controlled cracking furnace is beneficial. 当燃烧器中的空气量降低到空气/燃料的计量比(stoichiometric ratio)以下时,从裂解炉中排出的一氧化碳和烟就会增加。 When reducing the amount of air in the combustor to the metering air / fuel less, discharged from the cracking furnace will increase the ratio of carbon monoxide and smoke (stoichiometric ratio). 另一方面,过多的过量空气会降低裂解炉的总体效率,并导致氮氧化物的过量排放。 On the other hand, too much excess air reduces the overall efficiency of the cracking furnace, and result in excessive emission of nitrogen oxides. 因此,精确控制裂解炉中过量空气量对于达到效率与控制排放之间的最优平衡非常必要。 Thus, precise control of the amount of cracking furnace excess air is necessary for optimal balance between efficiency and emissions control.

[0004] 传统裂解炉中的氧气传感器是一种“点测量装置”,即它只测量传感器所处位置处氧气的含量。 [0004] conventional cracking furnace oxygen sensor is a "point measuring device", i.e. measuring the oxygen content only at the sensor location. 这种测量不能代表裂解炉整体的氧气浓度。 This measurement can not represent the entire cracking furnace oxygen concentration. 如果能够开发一种提供裂解炉内更具代表性的氧气含量的系统,这将是裂解炉控制技术的一个进步。 If we can develop a system the oxygen content of the cracking furnace to provide a more representative, it would be a progressive cracking furnace control technology. 此外,众所周知,传统的氧化锆氧气传感器易受诸如烃以及一氧化碳气体等因素干扰而影响氧气测量的准确度。 Furthermore, well-known, conventional zirconia oxygen sensor and vulnerable to disturbance factors such as hydrocarbons and carbon monoxide gas measurement accuracy of oxygen. 如果能够开发一种对这些干扰更免疫的系统,这也将是裂解炉控制技术的一个进步。 If we can develop a better immune system against such interference, this will be a progressive cracking furnace control technology.

[0005] Hanson等人在《Sensor for Advanced Combustion System(用于高级燃烧系统的传感器)》,Global Climate&Energy Project (全球气候和能源项目),斯坦福大学,2004, 的第II部分4. 3章节总结了可调的近红外二极管激光器的发展以及用于测定燃煤式电站锅炉、垃圾焚化炉以及喷气发动机排出的燃烧气(combustion gas)中氧气、一氧化碳以及氮氧化物含量的吸收光谱法。 [0005] Hanson et al., "Sensor for Advanced Combustion System (sensors for advanced combustion system)", Global Climate & Energy Project (Global Climate and Energy Project), Stanford University, 2004, in Part II 4.3 chapter summarizes development of tunable near-infrared diode laser and for determining the coal-fired utility boilers, incinerators and combustion gas discharged from the jet engine (combustion gas) absorption spectrometry oxygen, carbon monoxide and nitrogen oxide content. Thompson等人在美国专利申请公开US 2004/0191712 Al中将这一系统用于钢铁工业的燃烧应用中。 Thompson et al., In U.S. Patent Application Publication US 2004/0191712 Al This system will be used for combustion in iron and steel industry. 如果能够将可调的近红外二极管激光器以及用于燃烧气中氧气、一氧化碳以及氮氧化物测定的吸收光谱法应用于热裂解炉中,这将是一个技术进步。 If can be tunable diode laser and a near infrared absorption spectrometry combustion gas oxygen, carbon monoxide, and nitrogen oxides is applied to the measurement of the thermal cracking furnace, it would be a technical progress.

[0006] 发明内容 [0006] SUMMARY OF THE INVENTION

[0007] 对于以上所述需要对热裂解炉排出的燃烧气进行更加可靠的以及代表性的分析的问题,本发明,至少在一定程度上,提供了一种解决方案。 [0007] The need for the above combustion gas discharged from the thermal cracking furnace more reliable and representative analysis of the problem, the present invention is at least to some extent, to provide a solution. 本发明将可调的近红外二极管激光器以及吸收光谱法应用于热裂解炉排出的燃烧气中诸如氧气、一氧化碳以及氮氧化物的测定。 The present invention is an adjustable measuring near-infrared diode laser and oxygen, carbon monoxide and nitrogen oxides discharged from the combustion gas thermal cracking furnace as applied Absorption Spectrometry.

[0008] 更具体地,本发明是一种控制热裂解炉燃烧器中空气/燃料比的方法,包括:(a) 引导从可调二极管激光器发出的近红外光的波长调制光束穿过燃烧器排出的燃烧气入射到近红外光探测器以产生探测器信号;(b)在选自氧气、一氧化碳以及氮氧化物的被分析物的特征波长处对探测器信号进行光谱吸收分析,以测定被分析物在燃烧气中的浓度;以及(c)根据步骤(b)中被分析物的浓度调整燃烧器中空气/燃料比(即炉中的过量空气)。 [0008] More particularly, the present invention is a pyrolysis furnace burners method of an air / fuel ratio control, comprising: (a) the guide wavelength of the modulated beam of near-infrared light emitted from a tunable diode laser through the combustor combustion gas discharged incident to the near infrared light detector to generate a detector signal; (b) the detector signal is analyzed at a wavelength of spectroscopic absorption characteristics selected from oxygen, carbon monoxide and nitrogen oxides analyte to be measured concentration of the analyte in the combustion gas; and (c) according to step (b) is analyzed in an air / fuel ratio (i.e. excess air in the furnace) to adjust the concentration of the substance in the combustor.

[0009] 附图说明 [0009] BRIEF DESCRIPTION OF DRAWINGS

[0010] 特别地,可调二极管激光器发出的近红外光的波长范围在500至15000波数之间。 [0010] In particular, tunable near-infrared light emitted from the diode laser wavelength range between 500 to 15,000 wavenumber.

[0011] 图1是用于生产石蜡的典型的热裂解炉10的示意性侧视图; [0011] FIG. 1 is a schematic side view of a typical thermal cracking furnace 10 for producing paraffin;

[0012] 图2是图1中热裂解炉10的示意性后视图; [0012] FIG. 2 is a schematic rear view of the thermal cracking furnace 10 of FIG. 1 view;

[0013] 图3是用于本发明的优选的可调二极管激光器光谱装置的详细视图; [0013] FIG. 3 is a detail view of the present invention is preferably used in tunable diode laser spectroscopy unit;

[0014] 图4是本发明所述系统采集的光谱,显示了在表征可调二极管激光器产生的近红外光的氧气吸光率(absorbance)的波长区域内吸光率的精细结构。 [0014] FIG. 4 is a system according to the present invention, the collected spectra, showing fine structure absorbance in the wavelength region of near infrared tunable diode laser light generated in the characterization of oxygen absorbance (Absorbance) a.

具体实施方式 Detailed ways

[0015] 图1是用于生产石蜡的典型的热裂解炉10的示意性侧视图,热裂解炉10包括具有空气入口12以及废气出口13的外罩11。 [0015] FIG. 1 is a schematic side view of a typical thermal cracking furnace 10 for producing a paraffin wax of the pyrolysis furnace 10 comprises a housing having an air inlet 12 and the outlet 13 of the exhaust 11. 空气入口风扇14提供强制气流穿过燃烧器15。 14 air inlet fan providing forced air flow through the combustor 15. 废气风扇16将气流从炉10中引出。 Off-gas stream withdrawn from the fan 16 to the furnace 10. 裂解炉10的内部由三个主要部分构成:辐射室(firebox)部分17、桥墙(bridge wall)部分18、以及对流部分19。 Internal cracking furnace 10 consists of three main parts: a radiation chamber (Firebox) portion 17, the bridges (bridge wall) portion 18, and a convection section 19. 从燃烧器15出来的燃烧气首先被导入裂解炉10的辐射室部分17,然后穿过桥墙部分18以及对流部分19,最后从废气出口13排出。 15 out from the burner combustion gas is introduced into the first chamber portion 17 of cracking furnace 10 and then through the bridge wall portion 18 and a convection section 19, and finally discharged from the exhaust outlet 13. 原料流(feed stream) 20被引导穿过管道系统21以预加热原料。 Feed stream (feed stream) 20 is directed through the conduit system 21 to pre-heat the raw material. 蒸汽22被引入预加热后的原料,后者被设置于对流部分19的管道系统23进一步加热,然后被设置于辐射室部分17的管道系统24进一步加热以得到产品25。 Steam 22 is introduced into the raw material is preheated, the latter being disposed in the convection portion 19 of the pipe system 23 is further heated, and the radiation chamber is provided in the portion 17 of the pipe system 24 is further heated to obtain a product 25.

[0016] 现参照图2,图2是图1中热裂解炉10的示意性后视图,显示了辐射室部分17的外墙、桥墙部分18以及对流部分19。 [0016] Referring now to FIG. 2, FIG. 2 is a schematic rear view of a thermal cracking furnace 10. FIG view showing the external walls of the radiation chamber portion 17, the bridge wall portion 18 and a convection section 19. 可调二极管激光器系统26安装在裂解炉10的桥墙部分18,这样可调二极管激光器系统26的可调二极管激光器发出的光可以穿过流经桥墙部分18的燃烧气到达光探测器系统27。 Tunable diode laser system 26 is mounted in the bridge wall portion 18 of cracking furnace 10, so that the optical tunable diode laser tunable diode laser system 26 may be emitted through the combustion gas flowing through the bridge wall portion 18 reaches the light detector system 27 .

[0017] 现参照图3,图3是图2所示二极管激光器系统26和光探测器系统27的详细视图。 [0017] Referring now to FIG. 3, FIG. 3 is a diode laser system shown in FIG. 2 a detailed view of the system 26 and the light detector 27. 图3所示系统包括包含可调二极管激光器的激光器模块37。 The system shown in FIG. 3 includes a tunable diode laser comprising a laser module 37. 控制单元31包括用于信号处理(以下将详细讨论)的中央处理器、可调二极管激光器的温度与电流控制单元以及用户界面与显示。 The control unit 31 comprises a central processor for signal processing (discussed in detail below), the tunable diode laser temperature and current control unit and a user interface and display. 控制单元可如图所示包含在一个分离单元内,也可以包含在系统其他组件的某个内,例如控制单元包含在发射器(transmitter)中。 The control unit may comprise As shown in a separate unit, it may be included in one of the other components of the system, for example in the control unit comprises a transmitter (Transmitter) in. 校准板(alignment plate)29和调整杆30可以校准激光束41。 Calibration plate (alignment plate) 29 and the adjusting lever 30 of the laser beam 41 may be calibrated. 激光束穿过一个或多个窗口(例如熔融石英窗、蓝宝石窗) 进入裂解炉。 Laser beam passes through one or more windows (e.g., windows fused silica, sapphire window) into the cracking furnace. 这些窗口,例如双蓝宝石窗28可以安装在四英寸管法兰(pipe flange) 40内。 These windows, for example, bis sapphire window 28 may be mounted in a four inch pipe flange (pipe flange) 40. 窗口28之间的空隙由10磅/平方英寸表压(gauge pressure)下流速25升/分钟的氮气进行清洗。 The gap between the window 28 from 10 pounds / square inch gauge at a flow rate of 25 l pressure (gauge pressure) / min nitrogen purge. 安装法兰40使其穿过炉壁。 The mounting flange 40 so that it passes through the furnace wall.

[0018] 参考图3,激光束41穿过一个或多个窗口33 (可以是双蓝宝石或其它合适的材料, 例如熔融石英)到达近红外探测器38。 [0018] Referring to FIG 3, the laser beam 41 through one or more windows 33 (may be a dual sapphire or other suitable material, for example fused silica) reaches the near-infrared detector 38. 窗口33可以安装在四英寸管法兰39上。 Window 33 may be mounted on a four inch pipe flange 39. 窗口33 之间的空隙由10磅/平方英寸表压(gauge pressure)下流速25升/分钟的氮气进行清洗。 The gap between the window 33 from 10 pounds / square inch gauge at a flow rate of 25 l pressure (gauge pressure) / min nitrogen purge. 安装法兰39使其穿过炉壁。 The mounting flange 39 so that it passes through the furnace wall. 校准板34和调整杆35可以使探测器和激光束41光学对准。 Alignment plate 34 and the rod 35 can be adjusted and the probe laser beam 41 is optically aligned. 探测器的电子元件36通过电缆37与控制单元31保持电通信。 Holding the electronic component detector 36 via a cable 37 in electrical communication with the control unit 31. 控制单元31也与流程控制系统32保持电通信(通过电缆38)以控制裂解炉10。 The control unit 31 and the process control system 32 is also in electrical communication (via cable 38) to control the cracking furnace 10. 激光束41的光程长度大约为60英尺。 The optical path length of the laser beam 41 is approximately 60 feet. 图3所示系统可从得克萨斯州的Analytical Specialties of Houston公司采购到。 The system shown in FIG. 3 may be purchased from the company of Houston, Texas to Analytical Specialties.

[0019] 图3所示的系统测量激光穿过燃烧气时的吸收(损耗)。 The system shown in [0019] FIG 3 a measuring laser through the absorber (loss) in combustion gas. 氧气、一氧化碳以及氮氧化物的吸收光谱各自展现出独特的精细结构。 Oxygen, carbon monoxide and nitrogen oxides in the absorption spectrum of each show a unique fine structure. 光谱的个别特征(individual features)可以在可调二极管激光器37的高分辨率下看到。 Individual features of the spectra (individual features) may be tunable diode laser 37 with high resolution to see. 通过控制单元31控制输入电流可以调制可调二极管激光器37 (即从一个波长扫描或调谐到另一个波长)。 31 controls the input current by the control unit 37 may modulate the tunable laser diode (i.e., scanned or tuned from one wavelength to another wavelength).

[0020] 现参照图4,图4显示了在氧气吸收可调二极管激光器发出的近红外光的调制光束的区域内的光谱。 [0020] Referring now to Figure 4, Figure 4 shows the spectrum in the region of the oxygen uptake tunable modulated light beam near infrared light emitted from the diode laser. 图4所示的吸光率与燃烧气中氧气的浓度成比例。 Absorbance is proportional to the combustion gas oxygen concentration shown in FIG. 4. 在2333nm附近的一氧化碳吸收线用来测定低的一氧化碳PPm浓度。 Carbon monoxide near the 2333nm absorption line used to determine low concentrations of carbon monoxide PPm. 在1570nm附近的一氧化碳吸收线用来测定更高的一氧化碳浓度。 Absorption line near 1570nm used for measuring carbon monoxide in a higher concentration of carbon monoxide. 在2740nm附近的氮氧化物吸收线用来测定低的(low tosub) 氮氧化物PPm浓度。 In the nitrogen oxide absorption line near the 2740nm used for measuring low (low tosub) PPm concentration of nitrogen oxides. 在ISOOnm附近的氮氧化物吸收线用来测定更高的氮氧化物浓度。 In the vicinity of the nitrogen oxide absorption line ISOOnm used to determine a higher concentration of nitrogen oxides. [0021 ] 参考图1,根据以上所述的氧气、一氧化碳以及氮氧化物的可调二极管激光器光谱分析,可以控制(由图3中的流程控制器32控制)燃烧器15的空气/燃料比(炉中的过量空气)以优化废气中的氧气、一氧化碳以及氮氧化物的浓度。 [0021] Referring to FIG 1, a tunable diode laser spectroscopic analysis of the above oxygen, carbon monoxide, and nitrogen oxides can be controlled (controlled by a flow controller 32 in FIG. 3) burner 15 of air / fuel ratio ( excess air in the furnace) to optimize the oxygen concentration in exhaust gas, carbon monoxide, and nitrogen oxides.

[0022] 尽管以上已经结合优先实施例对本发明进行了描述,但是在本发明的精神与技术范围内,可以对本发明进行修改。 [0022] While the above preferred embodiment has been incorporated to the present invention has been described, but within the spirit and scope of the techniques of this disclosure, modifications may be made to the present invention. 因此本申请的目的在于涵盖任何利用此处公开的普遍原理对本发明进行的变形、使用、或者改变。 Therefore object of the present disclosure is to cover any variations of the present invention using the general principles disclosed herein, the use of, or change. 此外,本申请还涵盖与本公开内容不同但是在本发明所属领域且属于以下权利要求范围内的已知的或惯用的技术范围内的方案。 The present application also encompasses different, but the present disclosure or the scope of the technical solutions in the conventional art and the present invention belongs belong within the scope of the following claims is known.

Claims (4)

  1. 一种控制用于生产石蜡的热裂解炉的燃烧器中空气/燃料比的方法,其中热裂解炉包括辐射室部分、桥墙部分、以及对流部分,所述方法包括:(a)引导从可调二极管激光器发射的近红外光的波长调制光束穿过燃烧器排出的燃烧气入射到近红外光探测器以产生探测器信号,其中光束穿过桥墙部分;(b)在选自氧气、一氧化碳以及氮氧化物的被分析物的特征波长处对探测器信号进行光谱吸收分析,以测定被分析物在燃烧气中的浓度;以及(c)根据步骤(b)中被分析物的浓度调整燃烧器中空气/燃料比。 A method of controlling a thermal cracking furnace burner paraffin production of air / fuel ratio, in which thermal cracking furnace comprising a radiation chamber portion, the wall portion of the bridge, and a convection section, the method comprising: (a) from a guide a wavelength modulated beam of near infrared light emitted by the diode laser is modulated through the combustor of the combustion gas discharged incident to the near infrared light detector to generate a detector signal, wherein the beam passes through the bridge wall portion; (b) selected from oxygen, carbon monoxide and wherein the analyte at a wavelength of nitrogen oxides absorption spectrum of the detector signal is analyzed to determine the concentration of an analyte in the combustion gas; and (c) are analyzed according to step (b) adjusting the concentration of the combustion an air / fuel ratio.
  2. 2.如权利要求1所述的方法,其中可调二极管激光器发出的近红外光的波长范围在500至15000波数之间。 2. The method according to claim 1, wherein the tunable near-infrared light emitted from the diode laser wavelength range between 500 to 15,000 wavenumber.
  3. 3.如权利要求1所述的方法,其中测定氧气和一氧化碳在燃烧气中的浓度。 The method according to claim 1, wherein the determination of the concentration of oxygen and carbon monoxide in the combustion gas.
  4. 4.如权利要求1所述的方法,其中用来测定一氧化碳浓度的波长为2333nm。 4. The method according to claim 1, wherein the wavelength used for measuring concentration of carbon monoxide is 2333nm.
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