Oxygen-enriched nitrogen supply system for cupola furnace

Abstract

The invention discloses an oxygen-enriched nitrogen supply system for a cupola furnace. The oxygen-enriched nitrogen supply system comprises an oxygen-enriched nitrogen preparation device and an oxygen-enriched nitrogen supply device, and is characterized in that the tower top of an adsorption tower is connected with a nitrogen output pipeline of which one end extends into a tower body of the adsorption tower and the other end is connected with a nitrogen tank; an electromagnetic valve is arranged at a position, which is close to the tower top of the adsorption tower, of the nitrogen output pipeline; the nitrogen supply device consists of a nitrogen supply pipeline of which one end is connected with the nitrogen tank and the other end is connected with a cupola furnace dust removal device, and an electromagnetic valve and a nitrogen storage bag which are arranged on the nitrogen supply pipeline close to the cupola furnace dust removal device. The oxygen-enriched nitrogen supply system for the cupola furnace has the beneficial effects that waste nitrogen in the conventional cupola furnace oxygen-enriched air supply technology is conveyed into the cupola furnace and is used as power gas for a cupola furnace dust removal system, so that the phenomenon of bag burning caused by a fact that the conventional cupola furnace dust removal system uses air is avoided, and continuous work of the cupola furnace dust removal system is realized; the expense on dust removal bags is saved by about 100,000 RMB all the year round.

Description

technical field [0001] The invention belongs to the cupola ironmaking auxiliary system, in particular to a supply system for directly making compressed air into oxygen-enriched and nitrogen-enriched gas for the cupola. Background technique [0002] The performance of the cupola is very important to the quality and cost of castings. The cupola oxygen-enriched air supply technology for traditional smelting equipment in the foundry industry refers to the use of oxygen-enriched combustion-supporting methods to fully burn the coke in the cupola, improve the smelting intensity and the tuyere zone of the hearth. Combustion temperature, thereby increasing blast furnace output and reducing coke ratio. Cupola bag dust removal is also a relatively advanced dust removal system in the foundry industry. The existing dust removal system uses air as the gas to vibrate the bag, and the oxygen and dust contained in the air often cause the bag to burn. At present, in the oxygen-enriched prepa...

AI Technical Summary

Problems solved by technology

At present, in the oxygen-enriched preparation and supply technology, independent PSA (pressure swing adsorption), VPSA (vacuum pressure swing adsorption) and membrane separation air oxygen production and supply devices are mainly installed in front of the blast furnace blower, whether it is PSA or membrane separation The air oxygen generator can only prepare and use one of the gases. If oxygen is used, it is called an oxygen generator, and if nitrogen is used, it is called a nitrogen generator. It is a waste of another gas, resulting in a waste of energy and resources.

Chinese patent document CN202849472U discloses an oxygen-enriched dry gas supply device for blast furnace ironmaking, which can only provide a supply device for producing oxygen-enriched dry gas required for blast furnace smelting, and cannot make full use of the non-combustible characteristics of nitrogen to produce Nitrogen gas discarded in the oxygen enrichment process is used as the bag dust removal gas in the cupola to realize full utilization of nitrogen gas

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