Self-circulation type pulverized coal furnace device

Abstract

The invention discloses a self-circulation type pulverized coal furnace device. An interlayer is arranged between an inner cavity and a shell of a pulverized coal combustion smoke producer, the front end of the inner cavity of the pulverized coal combustion smoke producer is respectively provided with natural gas burner and a pulverized coal burner, and the tail end of the pulverized coal combustion smoke producer is respectively connected with a high-temperature smoke pipeline and a self-circulation waste gas pipeline; and the natural gas burner is connected with a natural gas combustion fan, the pulverized coal burner is respectively connected with a gas and powder mixing device and a second duct, the gas and powder mixing device is respectively connected with a first duct and a variable frequency feeder, and the second duct and the first duct are both communicated with the pulverized combustion fan through the interlayer of the pulverized coal combustion smoke producer. According to the invention, pulverized coal is used as main fuel, and natural gas is used as auxiliary fuel, so that the fuel cost is reduced. Circulating air of a pulverized coal preparing system is mixed with the high-temperature smoke of the pulverized coal combustion smoke producer; and compared with an open type combustion system, the oxygen content of a smoke discharge hole of the pulverized coal combustion smoke producer is greatly reduced, so that the safety of the pulverized coal preparing system is ensured.

Description

technical field [0001] The invention relates to a self-circulating pulverized coal furnace device. Background technique [0002] At present, as a mature technology, the blast furnace pulverized coal injection project has been accepted and adopted by most domestic iron and steel enterprises. In the blast furnace smelting process, pulverized coal has the dual functions of reducing agent and fuel at the same time. [0003] This feature of pulverized coal is also very suitable for the fuel and reducing agent demand of copper smelting furnaces in the non-ferrous smelting industry, but the non-ferrous industry has no by-products of blast furnace smelting such as blast furnace gas and hot blast stove exhaust gas. Therefore, the pulverized coal preparation system in the nonferrous metal industry needs to be equipped with a high-temperature flue gas generator. The high-temperature flue gas generator needs to purchase a large amount of fuel such as liquefied gas, natural gas, or fuel ...

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Problems solved by technology

Therefore, the pulverized coal preparation system in the nonferrous metal industry needs to be equipped with a high-temperature flue gas generator. The high-temperature flue gas generator needs to purchase a large amount of fuel such as liquefied gas, natural gas, or fuel oil separately in the market, and heat the air by burning the fuel to produce dry pulverized coal. high-temperature air; because the existing high-temperature flue gas generating device adopts an open combustion system, the oxygen content of the waste gas produced by the pulverized coal preparation system in the non-ferrous industry has not been able to be effectively controlled, so most of it is directly discharged into the atmosphere, which not only pollutes the air, but also Since the temperature of the exhaust gas is also above 70 or 80 degrees, it causes a waste of energy

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