Remote sensing of coal-fired MHD by optical diagnostic techniques

Murphree, David L.; Cook, Robert L.; Shepard, W. Steve; Bauman, L.E.; Gassaway, J. D.; Stickel, R. E.; Daubach, R.; Luthe, J. C.; Ali, Moonis; Srikantaiah, D. V.

doi:10.2514/6.1983-469

Cited by 2 publications

(2 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Details of the combustion test train have been reported previously (1, 4,5). In brief, the computer controlled, fully instrumental facility consists of an air pre-heater, a hot or cold air combustor, numerous test sections (120 cm in length, 20.3 cm in diameter) and an off gas system comprising a slag tap, scrubber and stack.…”

Section: Experimental Section Combustion Test Facilitymentioning

confidence: 99%

<title>Nonintrusive determination of combustion efficiency using FTIR spectroscopy</title>

Lindner¹,

Zhang²,

Cook³

1995

SPIE Proceedings

View full text Add to dashboard Cite

The combustion stoichiometry or air to fuel ratio is a critical operating parameter inn many processes. The stoichiometry and thus the combustion efficiency dictates the plant economics as well as the environmental impact. In this work the technique of Fourier transform infrared spectroscopy has been evaluated as a non-intrusive probe of CO and CO2 concentrations, average line of sight temperatures and temperature profiles on a 500 Kw oilfired combustion test facility. Results have been compared with facility temperatures and concentrations calculated from an equilibrium chemistry model. Both FTIR emission and absorption configurations were evaluated thereby allowing conclusions as to the potential of these techniques for large scale facility diagnostics. CO2 concentrations and profile temperatures were observed to agree well with the facility measurements and chemistry calculations. CO concentrations were observed to be in poor agreement with the calculations. This result is believed to arise form incomplete mixing in the test facility burner although other facility effects cannot be ruled out. The presence of CO in the spectra at an air to fuel ratio of 1.05 indicates that the FTIR methods can be used to diagnose burner operation. INTRODUCTIONA critical operating parameter for combustion-drive facilities such as advanced coal-fired power plants, incinerators, and rotary kilns is the burner air to fuel ratio or stoichiometry, q. At a stoichiometry of 1, for a simple hydrocarbon fuel, the principle combustion products will be CO2 and H2O. Combustion temperatures will be maximized. Decreasing p below 1 results in lower temperatures through the inefficient use of the fuel and thus the formation of products of incomplete combustion (PICs) such as CO and methane. At stoichiometries greater than 1, the excess air will result in cooler combustion temperatures although the reactions will proceed to completion. Burner stoichiometry therefore controls the environmental impact of the facility as well as the process economics. Higher combustion temperatures lead to increased heat transfer in downstream facility sections.The air to fuel ratio can be calculated from knowledge of the fuel composition and input feed rates. Following combustion an efficiency can he defined as

show abstract

Section: Experimental Section Combustion Test Facilitymentioning

confidence: 99%

<title>Nonintrusive determination of combustion efficiency using FTIR spectroscopy</title>

Lindner¹,

Zhang²,

Cook³

1995

SPIE Proceedings

View full text Add to dashboard Cite

show abstract

“…27 ' 28 The current version of the facility is a 500-kW-throughput oil-fired system capable of a maximum combustion core temperature of 2350 K. Air, at 1.1 atm pressure and a flow rate of 227 kg/h, is preheated to 1100 K by resistance heaters and used to oxidize fuel oil (diesel #1). A primary fuel pump and a peristaltic pump allow the injection of the fuel and K 2 SO 4 in slurry, respectively, to the combustor at a maximum rate of 20 kg/h.…”

Section: Test Facilitymentioning

confidence: 99%

Investigations of particle size and number density in advanced energy systems

Wang

Lindner

1990

Journal of Propulsion and Power

View full text Add to dashboard Cite

In MHD power plants, significant amounts of seed and slag particles are present in the combustion gas. The existence of these particles will significantly affect the performance of MHD components. Therefore, it is essential to be able to measure or predict the spectrum of the particle size and number density. A series of experimental tests has been conducted to measure the particle sizes and number densities of seed arid fly-ash particles by using two-color laser transmissometry. The measured values have been compared with the predictions from a theoretical model, and a reasonable qualitative agreement has been obtained between measurement and theory. The present work has demonstrated our ability to measure and predict particle evolution in MHD environments. NomenclatureA = cross-sectional area C = particle number, mass, or volume density c = constant c p = heat capacity d = diameter fn = particle size distribution function H = enthalpy h = convective heat-transfer coefficient 7 = incident radiation J = nucleation rate K = agglomeration kernel k = thermal conductivity f = effective pathlength m = mass flow rate or refraction index N = average number density Nu = Nusselt number n = particle size distribution function Pr = Prandtl number Q = extinction coefficient Re = Reynolds number r = radius or r coordinate T = temperature or transmittance u = velocity x = axial distance or x coordinate e = emissivity X = wavelength o = Stefan-Boltzmann constant or Mie extinction cross section p = density = stoichiometric ratio /* = viscosity Superscripts m = constant • = rate = averaged * = critical value Subscripts e = extinction / = fluid g = gas stream in = inlet m = measured or mass n = number o = clean gas stream out = outlet t = thermocouple v = volume w = wall

show abstract

Remote sensing of coal-fired MHD by optical diagnostic techniques

Cited by 2 publications

References 5 publications

<title>Nonintrusive determination of combustion efficiency using FTIR spectroscopy</title>

<title>Nonintrusive determination of combustion efficiency using FTIR spectroscopy</title>

Investigations of particle size and number density in advanced energy systems

Contact Info

Product

Resources

About