Heat accumulating type external heat blast cupola furnace

Abstract

The invention discloses a heat accumulating type external heat blast cupola furnace. The lower part of a furnace body is provided with a main air bellow; the middle part of the furnace body is provided with a primary combustion-supporting air bellow; the upper part of the primary combustion-supporting air bellow is provided with a furnace gas leading-out pipe; the furnace gas leading-out pipe is provided with a thermocouple and a secondary combustion-supporting air bellow; the other end of the furnace gas leading-out pipe is connected with a cyclone dust extractor; an air outlet of the cyclone dust extractor is connected with two heat accumulated type heat exchangers through smoke outlet pipes; the other ends of the heat exchangers are connected with a blast blower and a draught fan through pipelines provided with reversal valves; high-temperature hot blast output by the heat accumulated type heat exchangers is sent into the main air bellow, the primary combustion-supporting air bellow and the secondary combustion-supporting air bellow; an inlet smoke pipe of the draught fan is provided with a thermocouple; and an outlet of the draught fan is connected with a secondary dust collector. The heat accumulating type external heat blast cupola furnace does not use a combustion-supporting fuel to ignite furnace gas, the temperature of the hot blast reaches 600 to 900 DEG C, and the heat efficiency is over 60 percent which is far higher than that (25 to 35 percent) of the cupola furnace in general use at present.

Description

technical field [0001] The invention relates to the field of foundry production, and relates to a cupola for melting molten iron with coke as fuel. Background technique [0002] Presently known cupolas have cold blast cupolas and hot blast cupolas. The hot blast cupola includes two types: the inner heating cupola and the outer heating cupola. The hot air of the inner heating cupola is generated by the dense hot air bladder installed on the upper part of the melting belt. The furnace hot air only utilizes the physical heat of the furnace gas. The chemical heat in the furnace gas cannot be utilized, and the temperature of the hot air is generally less than 250°C. The externally heated cupola is to lead the furnace gas out of the furnace, ignite the furnace gas through the combustion-supporting fuel in the combustion chamber outside the furnace, and then turn the cold air into hot air through different forms of heat exchangers; the externally heated cupola can simultaneously ...

AI Technical Summary

Problems solved by technology

The disadvantages are: the physical heat of the furnace gas is lost, coal is required as a combustion-supporting fuel, and the heat exchange efficiency of the heat exchanger is low

Its disadvantages are: it needs to use natural gas as a combustion-supporting fuel, it has poor adaptability when the furnace gas temperature fluctuates, and the thermal efficiency of the heat exchanger is not high.

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