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Use of the heat of the exhaust gases of industrial furnaces by the method of thermochemical recuperation

Yatsenko V.P., PhD (Engin.), Senior Research Scientist, Shraiber O.A., Dr. Sci. (Engin.), Professor
Institute of General Energy of the National Academy of Sciences of Ukraine, 172 Antonovycha St., Kyiv, 03680, Ukraine
Language: Ukrainian
Source: The Problems of General Energy, 2014, 1(36):19-23
Section: Scientific foundations of energy saving and energy-saving policy
UDC: 536.7
Received: 18.02.2014
Published: 19.03.2014

Abstract:

A significant amount of natural gas is used for the realization of technological processes in various industrial furnaces. The temperature of exhaust gases of such furnaces can reach 1500 – 1800 K, which leads to significant heat losses and low fuel utilization factors (FUF). The most efficient way of substantial decreasing these losses is connected with the technology of thermochemical recuperation (TCR), based on fuel reforming with exhaust gases. In order to maximize the FUF of industrial furnaces, it is reasonable to apply combined recuperation, i.e. TCR and heating of the air that is fed for combustion.
We consider two schemes of combined recuperation with parallel or successive position of the fuel reformer and air heater. A method for the thermodynamic calculation of these schemes has been proposed, and the corresponding software has been developed. We present also an example of numerical results, where it is shown that the «parallel» scheme enables one to reach a very high FUF ~ 99 %, whereas the «successive» one gives FUF ~ 95 %. For comparison sake, we calculate the schemes of «pure» TCR or air heating, which result in FUF = 80 – 90 %.

Keywords: thermochemical recuperation, industrial furnace, exhaust gases, reformed fuel, fuel utilization factor.

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