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Reduction of the NOx generation through enhancing heat transfer in a furnace

  • V. V. Isaev
  • I. P. Kuznetsova
Article
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Abstract

The possibility of reducing the NOx concentration through enhancing heat transfer in a furnace is demonstrated. A method for approximate calculation of the reduction of the NOx concentration, with an intermediate radiator placed in the flame, is proposed.

Keywords

Heat Transfer Furnace Statistical Physic Approximate Calculation Enhance Heat Transfer 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notation

Tmax

maximal temperature of the flame, K

Trad

temperature of the radiator surface, K

CNO, CO2, CN2

concentrations of nitrogen oxides and oxygen in combustion products, and of molecular nitrogen, wt.%

R

universal gas constant, kJ/(kmol·K)

T

temperature in the reaction zone, K

H

gas enthalpy, kJ/m30, Stefan-Boltzmann constant, W/(m2·K4)

f

emittance of the furnace medium

F

running area of the radiating heating surface, m2

ϕ

heart efficiency of the screens

ψ

heat retentivity

Fw

surface area of the furnace walls, m2

VgCg

mean total heat capacity of the combustion products, K

Xmax

relative location of the temperature maximum in the course of the flame burnt-out expressed in fractions of a full length of the flame (furnace)

Tf

gas temperature at the furnace exit, K

Bo

Boltzmann number

Q1 and Q2

heat absorption of the heating surfaces from the flame without and with a radiator, kJ/m3

Qf

usable heat release in the furnace, kJ/m3

H1 and H2

gas enthalpies at the exit from the furnace without and with a radiator, kJ/m3

M

parameter accounting for the temperature distribution along the furnace height

C0

emittance of the black body, W/(m2·K4)

TW

temperature of the heat-absorbing surface, K

1 and ∈2

thermal emission coefficients of the radiator and of the heat-absorbing surface

A2

absorptivity of the heat-absorbing surface

B

fuel flow rate, m2/sec

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Literature Cited

  1. 1.
    S. N. Shorin and K. N. Pravoverov, Izv. Akad. Nauk SSSR, Otd. Tekh. Nauk, No. 8 (1953).Google Scholar
  2. 2.
    I. P. Kolchegonova, S. N. Shorin, Gaz. Promyshlen., No. 2, 27–33 (1959).Google Scholar
  3. 3.
    I. P. Kolchenogova, P. Ya. Sadovnikov, and D. A. Frank-Kamenetskii, Nitrogen Oxidation in Combustion [in Russian], Moscow (1947).Google Scholar
  4. 4.
    La formation des oxydes d'azote dans les foyers à porois chaudiers. Thermotechnique, No. 221 (1980).Google Scholar
  5. 5.
    A. G. Blokh, in: Heat Radiation in Boiler Units [in Russian], Leningrad (1967), pp. 200–210.Google Scholar
  6. 6.
    Thermal Calculation of Boiler Units (Standard Method) [in Russian], Moscow (1973).Google Scholar

Copyright information

© Plenum Publishing Corporation 1994

Authors and Affiliations

  • V. V. Isaev
  • I. P. Kuznetsova

There are no affiliations available

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