Pea coal pulverizing system and pea coal pulverizing method

Abstract

The invention discloses a pea coal pulverizing system and a pea coal pulverizing method. The pea coal pulverizing system comprises a cyclone separator (4), wherein a first collecting hopper (16) and a second collecting hopper (17) are arranged at the bottom of the cyclone separator (4) in parallel, the first collecting hopper (16) is communicated with a first pulverized coal vibrating screen (10), a first pulverized coal collection adjusting valve (5) and a first dust unloading valve (7) are sequentially arranged on a communicating pipeline of the first collecting hopper (16) and the first pulverized coal vibrating screen (10), the second collecting hopper (17) is connected with a first pulverized coal conveying machine (9), a second pulverized coal collection adjusting valve (6) and a second dust unloading valve (8) are sequentially arranged on a communicating pipeline of the second collecting hopper (17) and the first pulverized coal conveying machine (9), and the first pulverized coal conveying machine (9) is connected with a second pulverized coal vibrating screen (11). The pea coal pulverizing system and the pea coal pulverizing method can solve the technical problems that the blast furnace coal injection pulverizing system has low productivity.

Description

Technical field [0001] The invention belongs to the technical field of blast furnace ironmaking coal injection in the metallurgical industry. Specifically, the invention relates to a granular coal pulverizing system and a pulverizing method. Background technique [0002] Blast furnace pulverized coal injection is the direct injection of anthracite or bituminous coal or a mixture of the two from the tuyere of the blast furnace. In the blast furnace smelting process, it replaces coke to provide heat and reducer, thereby reducing the coke ratio. Reduce the cost of pig iron. Therefore, blast furnace coal injection is a major technological revolution in modern blast furnace smelting. Blast furnace coal injection is divided into pulverized coal injection and granular coal injection according to the particle size of coal. Pulverized coal injection has developed earlier and is relatively mature; however, granular coal injection has been rapidly developed and applied in some blast furna...

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Problems solved by technology

[0006] There are two related improvements for this bottleneck. One is to increase the fan suction and increase the flow rate of the gas-powder mixture in the cyclone separator, thereby increasing the coal powder entering the bag box and optimizing the powder collection ratio. The disadvantages are obvious. : Increasing the fan suction requires a higher investment cost for fan and motor modification. In addition, increasing the flow rate and coal powder entering the bag collector will increase the wear and tear of the system, especially the wear of the bag; the second is inside the cyclone Adding reverse blowing, or adding a bypass pipe at the outlet of the cyclone to the entrance of the bag powder collector, the purpose is to increase the amount of coal powder entering the bag powder collector, so there is still the defect of accelerating the wear of the bag, and the increase The reverse blowing may cause the air flow disorder in the system, thereby affecting the wind pressure, air volume and other parameters, and causing unpredictable adverse effects on the entire milling process system

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