Mathematical simulation of the furnace and turning gas conduit of a P-50R boiler during joint combustion of solid and gaseous fuel

Maidanik, M. N.; Verbovetskii, É. Kh.; Дектерев, А. А.; Chernetskii, M. Yu.; Гаврилов, А. В.; Boikov, D. V.; Berdin, S. V.

doi:10.1134/s0040601511060097

Cited by 9 publications

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“…The distribution of temperature along the height of steam boiler fireboxes was investigated by specialists of the All Russia Thermal Engineering Institute (VTI), Central Boiler-Turbine Institute (TsKTI), and other institutions; the results of temperature measurements are reported in many publications, e.g., in [6][7][8]. The torch fills the entire firebox chamber and has the shape of a straight elliptical cylinder; the isotherms shown in Fig.…”

Section: Calculation Of Heat Transfer In the Firebox Of A Tgmp 204 Stmentioning

confidence: 99%

Regularities pertinent to heat transfer in the gas layers of a torch in steam boiler fireboxes. Part III. Examples of heat transfer calculations in torch furnaces and steam boiler fireboxes

Макаров

2014

Therm. Eng.

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A unified procedure for calculating heat transfer in electric arc and torch furnaces, fireboxes, and com bustion chambers has been developed proceeding from the discovered regularities pertinent to heat transfer in torch gas layers [1,2]. The resulting integral heat fluxes consisting of radiant fluxes falling on the heating surfaces from the torch, wall and arch lining, combustion products, and convective fluxes are all calculated according to this procedure. Innovative designs of torch furnaces and fireboxes have been developed proceeding from the discovered regulari ties, the use of which makes it possible to obtain a higher output from fireboxes, more uniform steam generation in tubes, more uniform heating of articles, and smaller consumption of fuel.The torch burning in a steam boiler firebox is pro duced by a few tens of burners. In what follows, we consider two cases of heat transfer (a simple and a more intricate one) in a torch furnace and in a steam boiler firebox. Figure 1 shows the schematic design of a regenera tive soaking pit, the chamber of which has the shape of a parallelepiped 5.2 m in length, 2.24 m in width, and 3.1 m in height. The torch occupies the lower half of this chamber and part of its upper part. The remaining part of this chamber is occupied by combustion prod ucts. The furnace laboratory space from the front wall to the rear wall accommodates eight 2.2 m high steel ingots (weighting 7 t each). Owing to regenerative heating of gas fuel and air up to 850°С, the soaking pit can operate on blast furnace gas and on a mixture of blast furnace and coke (or natural) gases (the heating value ≈ 5000 kJ/m 3 ). The following values of parameters have been selected for carrying out calcu lations: the fuel flow rate is 3500 m 3 /h, and the ingot final heating temperature is1200°С. The calculation results are shown in Fig. 2. CALCULATION OF HEAT TRANSFER IN A TORCH FURNACEThe maximal heat fluxes falling on the ingot lateral surfaces are observed on the surfaces facing the soak ing pit lateral wall. Both the torch and the pit lateral wall radiate heat onto these surfaces. The highest tem peratures and the maximal ingot heating rates are noted here. The integral heat fluxes falling on the ingot lateral surfaces facing the pit longitudinal symmetry axis are smaller than the heat fluxes falling on the ingot lateral surfaces facing the soaking pit lateral wall.The distribution of integral fluxes over the upper horizontal surface of ingots was analyzed, and it was found from that analysis that the distribution pattern of their densities is significantly nonuniform in nature, varying from 22 kW/m 2 in the end ingots to 32 kW/m 2 in the middle ones. For the central ingots, the varia tion range of integral fluxes over the height of the ingot lateral surface facing the lateral wall surfaces is from 61 kW/m 2 in the ingot upper part to 80-85 kW/m 2 in the middle part and up to 68 kW/m 2 in the ingot lower parts. The similar indicators at the surface of ingots sit uated near the front wall are equal to 45, 70...

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Section: Calculation Of Heat Transfer In the Firebox Of A Tgmp 204 Stmentioning

confidence: 99%

Regularities pertinent to heat transfer in the gas layers of a torch in steam boiler fireboxes. Part III. Examples of heat transfer calculations in torch furnaces and steam boiler fireboxes

Макаров

2014

Therm. Eng.

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Development and operation of unit 3 at the Kashira GRÉS

Torkhunov¹,

Shvarts

Avrutsky

et al. 2012

Power Technol Eng

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Effect of the Reburning Zone Stoichiometry on the Nox Concentration at the Three-Stage Combustion of Pulverized Coal

2016

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Abstract. Numerical study of heat and mass transfer taking into account the combustion of coal particles in the furnace at the three-stage combustion of pulverized coal was performed. Analysis of the reburning zone stoichiometry on the concentration of nitrogen oxides at the furnace outlet was made. The values of excess air in the primary and reburning combustion zones, providing for the concentration of nitrogen oxides at the furnace outlet is not more than 350 mg/m 3 and unburned carbon not more than 1 % when burning coal with a high content of nitrogen were established.

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Mathematical simulation of the furnace and turning gas conduit of a P-50R boiler during joint combustion of solid and gaseous fuel

Cited by 9 publications

References 0 publications

Regularities pertinent to heat transfer in the gas layers of a torch in steam boiler fireboxes. Part III. Examples of heat transfer calculations in torch furnaces and steam boiler fireboxes

Regularities pertinent to heat transfer in the gas layers of a torch in steam boiler fireboxes. Part III. Examples of heat transfer calculations in torch furnaces and steam boiler fireboxes

Development and operation of unit 3 at the Kashira GRÉS

Effect of the Reburning Zone Stoichiometry on the Nox Concentration at the Three-Stage Combustion of Pulverized Coal

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