Mixed heating roller hearth type medium plate open-fire tempering furnace and application

Abstract

The invention discloses a mixed heating roller hearth type medium plate open-fire tempering furnace and application and relates to the technical field of heat treatment equipment. The mixed heating roller hearth type medium plate open-fire tempering furnace comprises an upper heating section and a lower heating section; the heating temperature range of the lower heating section is the same as thatof the upper heating section, the lower heating section adopts a fuel gas open-fire burner, the upper heating section adopts a plurality of flue gas circulating heating systems distributed in the length direction of the tempering furnace, and circulating flue gas of the flue gas circulating heating systems comes from the flue gas of the fuel gas open-fire burner. A mixed heating mode of the upperflue gas circulating heating system and the lower fuel gas open-fire burner for heating is adopted, reversing is conducted through the flue gas circulating heating system, convective heat transfer inthe tempering furnace is enhanced, and the unit capacity of the tempering furnace is improved.

Description

technical field [0001] The invention relates to the technical field of heat treatment equipment, in particular to a mixed heating roller hearth type open flame tempering furnace for medium and thick plates and its application. Background technique [0002] At present, the tempering furnace for heat treatment of medium and thick plates generally adopts gas-fired heating method, and there are two types of burners: 1. Self-preheating burner, and the combustion flue gas comes out of the furnace from the burner; 2. Sub-high-speed burner, The combustion flue gas exits the furnace through the exhaust port on the top of the furnace. [0003] The main problems of the above two types of burners: burner pulse combustion, local high temperature in the flame area, the lower the furnace temperature, the fewer working burners, the worse the fluidity of flue gas in the furnace, and the unsatisfactory uniformity of furnace temperature; When the self-preheating burner is in the low-temperatu...

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Problems solved by technology

[0003] The main problems of the above two types of burners: burner pulse combustion, local high temperature in the flame area, the lower the furnace temperature, the fewer working burners, the worse the fluidity of flue gas in the furnace, and the unsatisfactory uniformity of furnace temperature; When the self-preheating burner is in the low-temperature tempering state, the failure rate is relatively high due to the low-temperature condensed water of the flue gas

[0004] In order to improve the uniformity of the furnace temperature, some circulating stirring fans are added on the top of the furnace. Although the fluidity of the flue gas in the furnace is increased, the directionality of the flue gas flow is poor, and the convective heat transfer efficiency is not high; Inside, its failure rate is relatively high, and maintenance is not convenient

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