Two-dimensional temperature measurements in a technical combustor with laser Rayleigh scattering

Abstract

Application of the two-dimensional laser Rayleigh technique to the investigation of a large-scale industrial combustor is reported for the first time to our knowledge. Two-dimensional laser Rayleigh scattering was used to perform quantitative measurements of the temperature fields in different downstream positions of a 150-kW industrial, premixed, turbulent low-emission swirl combustor. Because of the possible interferences of the Rayleigh signal with Mie scattering and laser reflections of the burner components, some minor modifications of the design of the combustor and its gas supply were necessary. This was done without changing the basic characteristics of the burner. The quantitative and instantaneous character of the collected data allows calculation of ensemble-averaged temperature distributions and analysis of the flame structure in the turbulent combustion field. The measured temperature distribution confirms that the flame is stabilized by a central recirculation zone.

Experimental investigation on simultaneous measurement of temperature distributions and radiative properties in an oil-fired tunnel furnace by radiation analysis

“…The tunnel furnace is 4.2 m long and the dimension of the cross-section of the furnace is 0.7 m  0.7 m. The burner is installed at center of the back wall of the furnace, which is a kind of industrial burner with model MG-101 (nozzle-mix) in Brazil and designed for dual-fuel (natural gas or light diesel). The material of the internal refractory wall is Mulcorita (RPA-MC30), whose composition is 47%Al 2 O 3 , 43%SiO 2 , 6.5%MgO, and 2%Fe 2 couple is installed in the bottom wall of the furnace to measure the temperature of the refractory wall. The measured temperature by the thermocouple is also used to avoid the overheating of the refractory wall, because the highest resistance temperature of RPA-MC30 is 1533 K. The image processing system consists of two flame image detectors, a frame-grabber, and a personal computer.…”

“…In practice, the most widely applied methods are thermocouple and suction pyrometer, which have some disadvantages, such as single-point measurement and degradation in harsh environments. Optical methods base on laser technique can measure flame temperatures and their distributions [1,2]. But due to the large dimensions of a furnace and the limited power of a laser, these methods are unsuitable for industrial furnaces and boiler furnaces.…”

Reconstruction of Three-dimensional Temperature Distribution with Radiative Image by Monte Carlo Method in Blast Furnace Raceway

“…Optical methods base on laser technique can measure flame temperatures and their distributions. 4,5) But due to the large dimensions and sealing of blast furnace and the limited power of a laser, these methods are unsuitable for blast furnaces. However, thermal radiation is the predominant mode of heat transfer in hightemperature blast furnace.…”

Pressure Effects on Structure and Temperature Field of Laminar Diffusion Flames

“…6 Even rapid-insertion techniques fail at the very high soot loadings found in high-pressure laminar diffusion flames. Consequently, a variety of optical methods such as LIF (laserinduced fluorescence), 7 and LSM (laser scattering of molecules), 8 have been developed in recent years. However, due to the complication of the measurement principles and system structures and using external light sources, these techniques are unsuitable for routine operations in industrial furnaces.…”