A heating furnace high-temperature flue gas waste heat utilization system and method

Abstract

The invention provides a high-temperature flue gas waste-heat utilization system and method for a heating furnace. A gravity dust collector, a superheated steam generation device, a combustor and a waste heat boiler are added on a flue of the heating furnace; the system is externally connected with a steam-turbine generator. Superheated stem is generated to serve as generation supplement steam after heat exchange between high-temperature flue gas and saturated steam flowing into a heating furnace drum of the superheated steam generation device; cooled flue gas is then subjected to heat exchange with air and coal gas. According to the high-temperature flue gas waste-heat utilization system and method, rolling waiting time is short, and heat exchange is performed between the high-temperature flue gas produced by the combustor and the saturated steam of the waste heat boiler to generate the superheated steam for generation. By means of the high-temperature flue gas waste-heat utilization system and method, the problem of deficiency of the flue gas amount during rolling waiting of the heating furnace is solved, and accordingly, the comprehensive heat energy utilization efficiency can be improved, and the heating furnace exhaust temperature can be greatly reduced; besides, coal gas spreading can be reduced, energy is saved, and the environment is protected.

Description

technical field [0001] The invention belongs to the field of waste heat utilization of industrial kilns, and in particular relates to a stable high-temperature flue gas waste heat utilization system of a heating furnace and a utilization method thereof. Background technique [0002] With the development of society, energy issues are particularly important. Rational use of a large amount of waste heat and energy resources produced by metallurgical enterprises has become an urgent problem to be solved. The heating furnace in the rolling process of metallurgical enterprises is one of the most energy-consuming equipment. In my country, the energy used by the heating furnace accounts for about 20% of the total energy used in the country. The heating furnace converts chemical energy into heat energy through fuel combustion to meet the requirements of various steel heating processes. When the flue gas generated by combustion is discharged out of the furnace, it takes away about 3...

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Problems solved by technology

[0004] The present invention aims to solve the gas emission problem existing in the heating furnace when it is to be rolled, and further provide a method that can fully and effectively recycle a large amount of waste heat and energy resources taken away by the flue gas of the heating furnace, greatly reduce the exhaust gas temperature of the heating furnace, and improve the comprehensive utilization of heat energy High-temperature flue gas waste heat utilization system and method for heating furnace with high efficiency and ensuring stable operation of heating furnace flue gas waste heat recovery system

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