Efficiency Improvement Of The Hot Blast
Generating System By Waste Heat Recovery
Author(s)
Pei-Hsun Lin, Pai-Hsiang Wang, Hui-Tien
Chen & Wei-Lun Chung
Abstract
To meet the increasing demand for energy saving and sustainable CO2 reduction,
a heat-pipe heat exchanger has been applied in the hot blast generating system to
recover the flue gas sensible heat for the purpose of fuel gas preheating. In this
paper, the performance evaluation method for the hot blast generating system is
proposed and used to investigate the fuel gas preheating effect on the system’s
thermal efficiency. Experimental observation revealed that 3.1% of the
efficiency improvement was achieved by the application of waste heat recovery.
Accordingly, the energy consumed to enhance the blast air temperature was
diminished by 0.115 kJ/°C-Nm3. In addition to energy saving, the fuel gas
preheating also led to the reduction of the enrichment gas depletion rate. Based
upon the field test results, the records indicated that the implementation of the
flue gas heat recovery scheme in the hot blast generating process resulted in a
saving of fuel consumption by 822 l/h on an oil equivalent basis. The benefits of
energy saving over 1.9 million US dollars and the CO2 reduction 15,000 tons can
be achieved annually.
Keywords: waste heat recovery, hot stove, energy saving, thermal efficiency.
1 Introduction
Hot stoves are thermal regenerators applied to produce hot blast air in blast
furnace iron making process. In China Steel Corporation, the hot blast air
generating system for the No.2 Blast Furnace consists of four hot stoves. Each
stove is operated alternatively with on-gas and on-blast cycles to deliver stable
hot blast air flow to blast furnace under specific conditions. During the on-gas
Keywords
waste heat recovery, hot stove, energy saving, thermal efficiency.
Related Book
Other papers in this volume
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