Energy-saving environment-friendly efficient hot blast cupola

Abstract

The invention relates to an energy-saving environment-friendly efficient hot blast cupola. The energy-saving environment-friendly efficient hot blast cupola comprises a smelting device and a waste gas treatment device which are connected. The smelting device comprises a cupola body, a front ladle, a first smoke pipe, a combustion chamber, a preheating furnace, a cold air fan, a heat exchanger, an air blower and a second smoke pipe, wherein the cupola body is provided with a hot air inlet; a feeding inlet is formed in the upper end of the cupola body, and the lower end of the cupola body communicates with the front ladle; the cupola body comprises a smoke chamber which communicates with the combustion chamber through the first smoke pipe; the preheating furnace communicating with the combustion chamber is arranged on the lower portion of the combustion chamber; the two sides of the upper portion of the combustion chamber communicate with the cold air fan and the heat exchanger correspondingly; the air blower is arranged on one side of the heat exchanger; a cold air inlet of the heat exchanger communicates with an air outlet of the air blower, and a hot air outlet of the heat exchanger communicates with the hot air inlet of the cupola body; and the lower portion of the heat exchanger communicates with the waste gas treatment device through a cooling chamber. According to the energy-saving environment-friendly efficient hot blast cupola, pig iron and scrap iron are both smelted into molten iron, the purity of the generated molten iron is high, the energy-saving and conversion efficiency is high, and meanwhile discharged waste gas is free of pollution.

Description

technical field [0001] The invention belongs to the field of metallurgical casting for smelting metals, in particular to an energy-saving, environment-friendly and high-efficiency hot blast cupola. Background technique [0002] The cupola is an important equipment for melting molten iron in foundry production. The iron material is melted into molten iron and then poured into the sand mold. After cooling, the casting is obtained by opening the box. Energy-saving and environment-friendly cupola refers to an equipment system, which includes independent combustion chamber, heat exchanger, flue gas cooler, dust collector, induced draft fan, spray equipment and chimney in addition to the cupola body. [0003] The cupola is a shaft-type melting furnace, which is mainly composed of the forehearth of the furnace body and the feeding system. There are tapholes and slag outlets on the forehearth, which are connected with the furnace body by bridges. The furnace body is divided into ...

AI Technical Summary

Problems solved by technology

In long-term use, it has been found that the existing domestic cupolas have many shortcomings, most of which are cold air stoves, that is, the air blown into the cupola by the blower is cold air that has not been preheated, or the hot air temperature is relatively low after preheating. Inner hot air stove

Due to the low wind temperature, the smelting temperature in the furnace is low and the smelting environment is poor, resulting in low temperature of molten iron, which is not conducive to the desulfurization, degassing and separation of slag and iron of molten iron, and the purity of molten iron is poor, resulting in poor casting quality

To obtain highly pure molten iron can only increase the input of coke, resulting in increased coke consumption and waste of energy

Secondly, most of the waste gas produced by the cupola during the smelting process is discharged directly or after some simple treatment, causing pollution to the atmosphere

It brings many problems to the actual use, hinders the survival and development of foundry enterprises, becomes a bottleneck for the survival of foundry enterprises, and cannot keep up with the pace of social development

In addition, the general cupola can only smelt pig iron blocks in terms of design requirements. In order to ensure the quality of castings, cheap raw materials cannot be used, which will affect the market competitiveness of enterprises.

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