A vertical two-stage blast furnace pulverized coal injection method

A two-stage, pulverized coal technology, applied in blast furnaces, blast furnace details, furnaces, etc., to achieve the effects of increasing coal ratio, improving gas utilization rate, and reducing fuel ratio and cost
CN108220515BActive Publication Date: 2019-09-03NORTHEASTERN UNIV LIAONING
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
NORTHEASTERN UNIV LIAONING
Publication Date
2019-09-03

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Abstract

The invention belongs to the technical field of blast furnace ironmaking, and in particular relates to a method for injecting pulverized coal into a vertical two-stage blast furnace. Specifically, the pulverized coal is injected from the outside into the blast furnace through multiple pulverized coal lances from top to bottom under the high-pressure driving of the carrier gas; the pulverized coal is injected in each pulverized coal lance. The mass ratio of the pulverized coal to the carrier gas is less than or equal to 20kg / kg; the injection pressure P of the pulverized coal at the mouth of the pulverized coal spray gun 喷 , the P 喷 It conforms to the following mathematical relationship: P 喷 =P 风 +50kPa~P 风 +150kPa, where P 风 is the blast furnace hot air pressure. The pulverized coal injection method provided by the invention can improve the gas flow distribution in the furnace and increase the gas utilization rate (η CO ) to solve problems such as gas flow distribution and material column permeability, so as to achieve rapid, effective and uniform injection, and achieve the beneficial effects of increasing the coal ratio, reducing the fuel ratio and cost.
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Description

technical field

[0001] The invention belongs to the technical field of blast furnace ironmaking, and in particular relates to a vertical two-stage blast furnace pulverized coal injection method. Background technique

[0002] Pulverized coal injection technology is one of the effective measures to reduce costs and increase efficiency in blast furnace ironmaking. Blast furnace coal injection can not only greatly reduce the coke ratio, but also adds a means of adjustment to blast furnace operation. Blast furnace operators can control the thermal state of the blast furnace by controlling coal injection. Therefore, the blast furnace pulverized coal injection process can greatly reduce the cost of pig iron, reduce the use of coke ratio, and improve the environment. In addition, the current distribution of blast furnace gas flow is not conducive to the utilization of blast furnace gas. Properly increasing the gas volume in the radial direction R / 3 (R is the radius of the furnace a...

Claims

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