What Is a Cupola Furnace?

Cupola is an important equipment for melting cast iron in foundry production. It melts the cast iron block into molten iron, casts it into sand molds, cools it, and unpacks it to obtain castings. Cupola is a vertical cylindrical melting furnace, divided into a front furnace and a rear furnace. The forehearth is divided into a tap hole, a slag hole, a furnace hearth and a bridge. The rear furnace is divided into three parts, the top furnace, the waist furnace and the hearth. The waist furnace is separated from the hot air surrounding tube, closed after repairing, and sealed with mud. On the top furnace is a heat exchanger. It is mainly used in the production of cast iron parts, and also used in converter steelmaking. It is called a cupola because the top of the furnace is open.

Cupola

Cupola is an important equipment for melting cast iron in foundry production.

Vertical furnace, continuous charging, a vertical cylindrical casting iron smelting equipment. Mainly used

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Its technical characteristics are :

Cold wind cupola for

In ancient times, cast iron was produced directly from iron furnaces. Around the 10th century AD, the Song Dynasty in China had been called a "furnace" because of its ease of movement.

First, the furnace bottom and furnace base

Second, the furnace body

Furnace: The furnace body between the lower edge of the feeding port and the first exhaust port. The internal cavity is called the furnace, and its diameter determines the melting rate. 1.5 ~ 10 tons, the larger the inner diameter of the cupola, the higher the melting rate). The furnace shell is made of steel plate on the outside, and the refractory lining is laid inside. The preheating of the charge and the entire melting process are carried out in the furnace body.

Effective height: main working section of cupola.

Hearth: The furnace body between the centerline of the first air outlet and the hearth. The molten iron flows into the forehearth through the hearth and the bridge.

The main role of the hearth:

Protection of the hearth

2. Gather molten iron and slag into the forehearth

3. The hearth without furnace is mainly used for storing molten iron.

3. Forehearth: The forehearth consists of the front furnace body and a detachable furnace cover.

The role of the forehearth:

Storage of molten iron

2. Make the molten iron composition and temperature uniform

3. Reduce the carbon and sulfur increase of molten iron in the hearth

4. Separate iron slag to purify molten iron

Bridge: The part connecting the hearth and the forehearth.

4. Air supply system: The entire system from the blower outlet to the air outlet, including the air inlet, air box, air outlet and blower output pipe.

note:

1. The air duct layout should be as short as possible

2. Reduce twists and turns

3. Avoid sudden changes in pipe section

4. The flow velocity in the main duct should be controlled

Hot air device

Role: Heating the air for bottom coke combustion to enhance the combustion of coke.

Classification: internal heating type, external heating type

The auxiliary equipment of the cupola include weighing, conveying, feeding, and air supply.

V. Chimney and Dedusting Device

Chimney: For exhausting smoke, a wet dust catcher is installed on the top to catch sparks.

Six, feeding device