Long-distance coal injection system

A long-distance, tank-injection technology, applied in tuyere, furnace, blast furnace details, etc., can solve problems such as injection pulsation pipeline, blast furnace temperature fluctuation, blockage, etc., achieve long-distance uniform injection, reduce impact, and reduce pipeline Effect of wear and gas consumption

Active Publication Date: 2011-08-17
CISDI ENG CO LTD
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

The pulverized coal from the injection tank is directly injected into the blast furnace after passing through the gas supply device. However, when the injection distance is increased, problems such as injection pulsation and pipe blockage are prone to occur, resulting in fluctuations in the temperature of the blast furnace, affecting the blast furnace condition and Hot metal quality

Method used

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  • Long-distance coal injection system
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Embodiment Construction

[0014] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0015] Such as figure 1 As shown, a long-distance coal injection system uses compressed air to transport gas. The sending end of the system is the injection tank 1, the mass flow rate of pulverized coal at the outlet of the injection tank is 40 t / h, and the solid-gas ratio is 100:1. The pulverized coal main pipe 3 transports the pulverized coal to the buffer tank 4. The pulverized coal main pipe adopts double-tube turbulent flow dense-phase conveying with a length of 1000 m. The pulverized coal and air are separated in the buffer tank 4, and the air is released through the pressure control valve 5. The pulverized coal settles to the buffer tank 4 bottom.

[0016] The pulverized coal in the buffer tank 4 flows into the vertical riser 8 through the inclined descending pipe 6. Under the action of the air nozzle 7, the pulverized coal begins to b...

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Abstract

The invention discloses a long-distance coal injection system which comprises an air supply device (2) connected with an injection tank (1), and has the key points that a buffer tank (4) provided with a pressure control valve (5) is also connected behind the air supply device (2); the buffer tank (4) is connected with a vertical raising pipe (8) by an inclined descent pipe (6); and an outlet of the vertical raising pipe (8) is connected with a blast-furnace tuyere (11) by a coal injection branch pipe (10). The vertical raising pipe (8) is provided with a gas nozzle (7), and compressed air or compressed inert gas is adopted for injection. As the buffer tank is arranged, the fluctuation of pulverized coal flow can be eliminated by the buffer tank after pulverized coal is conveyed into the buffer tank through the injection tank from a long distance, the requirement of a blast furnace for the uniformity of coal injection can be met, and the long-distance even injection of the blast furnace coal injection can be realized.

Description

technical field [0001] The invention relates to a system for pneumatically conveying bulk materials through pipelines. Background technique [0002] Blast furnace coal injection technology has been widely used in my country. After decades of development, my country's blast furnace coal injection technology and technology have developed to a relatively high level, and great progress has been made in terms of popularity and average coal ratio. Represented by Baosteel's blast furnace, more and more blast furnaces have been operating stably at a high coal ratio for a long time. According to the technical requirements of the national industry, newly built or renovated blast furnaces must be equipped with a coal injection system. [0003] At present, most newly-built steel plants in China adopt the process of centralized pulverization and centralized injection, and one pulverization injection station performs direct injection to multiple blast furnaces at the same time. Due to t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B7/16C21B5/00
Inventor 陈君颜新张波张义贵钟星立钟渝
Owner CISDI ENG CO LTD
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