CN103451337A

CN103451337A - Method for balancing resistance loss of double-distributor pipeline

Info

Publication number: CN103451337A
Application number: CN2013103520272A
Authority: CN
Inventors: 陶宏; 闻为民; 李祥; 伊大为; 朱罡
Original assignee: Baosteel Group Xinjiang Bayi Iron and Steel Co Ltd
Current assignee: Baosteel Group Xinjiang Bayi Iron and Steel Co Ltd
Priority date: 2013-08-13
Filing date: 2013-08-13
Publication date: 2013-12-18

Abstract

The invention provides a method for balancing the resistance loss of a double-distributor pipeline. The method comprises the following steps: (1) balancing pressure: enabling the resistance loss deltaPodd of an odd pipeline to be approximately equal to the resistance loss deltaPeven of an even pipeline, wherein the amount of coal blown by the even pipeline is greater than that blown by the odd pipeline when the resistance loss of the odd pipeline is greater than the pressure of the even pipeline, and the amount of coal blown by the odd pipeline is greater than that blown by the even pipeline when the resistance loss of the even pipeline is greater than the pressure of the odd pipeline; (2) mounting reducing-diameter sleeves on pipelines from a splitter to distributors, enabling the diameters of both the odd pipeline and the even pipeline to be 100, meanwhile, mounting a flow limiting orifice plate with the diameter of 50 on the odd pipeline, and enabling the pressure difference between the odd pipeline and the even pipeline to be 5-8KPa so as to meet the requirements on that the resistance loss of the odd pipeline and the even pipeline does not exceed 10KPa.

Description

A kind of method of damaging balance for two distributor duct resistances

Technical field

The invention belongs to the gas-solid pipe transportation technology, at the bifurcated device, between divider, unit with balanced pressure is installed, improve the quality of pulverized coal injection, reduce the workload of block clearing, the production and application effect highlights.

Background technology

In recent years, constantly perfect along with domestic coal powder injection technology, blast furnace maximization, oxygen enrichment, large coal amount and low coke ratio, low consumption, environmental protection are the trend of smelter development.The large pulverized coal injection of eight steel all adopts two divider winding-ups, and carry out balance and guarantee all sprays by odevity, even spray, and the resistance of odd even pipeline pressure occurs in actual production process, damage uneven, wherein a pipeline has coal, another pipeline is without coal, cause the pulverized coal injection inequality, and affect the coal powder injection total amount, damage on little pipeline reducing casing is installed to the export distributor pressure drag at the bifurcated device therefore adopt, equilibrium pressure thus, reaching the odd even pipeline damages identical from the bifurcated device to the export distributor pressure drag, thereby guarantee that pulverized coal injection all sprays, even spray, promote Coal Injection Rate at BF, reduce the blocking cleaning work amount for reducing, guarantee that environmental quality has played positive effect.

Summary of the invention

The object of the invention is to: control in two arms by restriction orifice, make odd even coal rifle coal amount identical, guarantee the pulverized coal injection quality, the improving product market competitiveness.

The present invention seeks to realize like this: a kind of method of damaging balance for two distributor duct resistances, implement step by step;

1) pressure calibration:

△ P is damaged in odd number pipeline resistance strange=∥ P-P1 ∥; △ P idol=∥ P-P2 ∥ is damaged in the resistance of even number pipeline;

Wherein P is coal powder injection total pipeline pressure, and P1 is the pressure that the odd number end advances divider, and P2 advances the pressure of divider for counting end;

Pressure equilibrium: the resistance of odd number pipeline is damaged the resistance of the strange ≌ even number of △ P pipeline and is damaged △ P occasionally;

Damage and be greater than the even number pipeline pressure when the resistance of odd number pipeline, illustrate that the coal amount of even number pipeline winding-up is greater than odd number; Damage and be greater than the odd number pipeline pressure when the resistance of even number pipeline, illustrate that the coal amount of odd number pipeline winding-up is greater than even number;

2) the bifurcated device is installed reducing casing to the pipeline of divider, makes the odd even caliber be ￠ 100, and the restriction orifice of ￠ 50 is installed simultaneously on the odd number pipeline, and making odd even pipeline difference is 5-8KPa, meets odd even resistance damage and is no more than 10KPa.

Mechanism of the present invention and effect: the character of gas-solid mixing is between gas and solid, and its fluidity determining is in the average grade of gas-solid mixing concentration, solid, gas-solid ratio, moisture content, temperature, arm pressure drag damage etc.Damage on little pipeline reducing casing is installed to the export distributor pressure drag at the bifurcated device, equilibrium pressure, reach the odd even pipeline and damage identical from the bifurcated device to the export distributor pressure drag thus; Top at the odd number pipeline installs current limiting tube additional, meets odd even resistance and damages and be no more than 10kp, and odd even coal rifle is produced coal normally, and winding-up is stablized, and for enterprise energy-saving and cost-reducing, has made important exemplary role, shows technical progress.

The accompanying drawing explanation

The present invention is described further by reference to the accompanying drawings.

The schematic diagram of the flow process resistance damage device that accompanying drawing is the method;

------minute odd even two-way (top, Qi road installs current limiting tube additional)--divider--coal spouting gun is to blast furnace (pressure) for the bifurcated device for winding-up tank (pressure) as shown in the figure: the coal powder injection house steward.

Specific embodiment

The present invention is described further in conjunction with the embodiments.

Embodiment

1) tensimeter shows: △ P is damaged in the resistance of odd number pipeline strange=∥ P-P1 ∥; △ P idol=∥ P-P2 ∥ is damaged in the resistance of even number pipeline; Wherein P is that coal powder injection total pipeline pressure, P1 are that pressure, the P2 that the odd number end advances divider advances the pressure of divider for counting end;

Pressure equilibrium: it is even that △ P is damaged in the resistance of the strange ≌ even number of odd number pipeline resistance damage △ P pipeline, and scope meets odd even resistance damage and is no more than 10KPa, and the odd even pipeline produces coal substantially suitable; Damage when the resistance of odd number pipeline the coal amount that is greater than the winding-up of even number pipeline pressure explanation even number pipeline and be greater than odd number; Damage when the resistance of even number pipeline the coal amount that is greater than the winding-up of odd number pipeline pressure explanation odd number pipeline and be greater than even number;

2) require odd even resistance to damage and be no more than 10KPa, otherwise wherein stifled, the normally coal powder injection of pipeline of odd even will occur, the restriction orifice (the odd even caliber is ￠ 100) of installation ￠ 50 on the odd number pipeline wherein, reach odd even pipeline difference and be only 5 or 8KPa.

Present method is as shown in the figure: high concentration pulverized coal and nitrogen, compressed-air actuated mixture (character with gas) are forced into 0.8MPa by the winding-up tank, be divided into the odd even two-way along the coal powder injection house steward through the bifurcated device and arrive divider separately, 6 or 10 coal spouting guns spray into blast furnace to coal dust on by divider, characteristics according to the new A of steel mill, B pulverized coal injection pipeline, the pressure drag of odd number pipeline damages little, the coal dust major part is walked the even number pipeline, cause the breeze blowing of odevity rifle inhomogeneous, seriously cause the even number pipeline stifled, therefore install current limiting tube additional at the top of odd number pipeline.

Ben Fafa installs the technique effect of current limiting tube additional:

When 1) A blast furnace odd even pipeline difference only is 5KPa, odd even coal rifle produces coal normally, and after pulverized coal injection in blast furnace is normal, coal is up to 135kg/t than promoting, and reduces coke ratio to 430kg/t, reduces ironmaking cost.

2) the odd even resistance is damaged and is no more than 10KPa, must carry out the restriction orifice adjustment as super, and write technical regulation, the job instruction of this enterprise, to each position temperature, containing oxygen, coal powder injection fugitive constituent standard revised.

3) the average coal of blast furnace raises 100kg/t than from 80kg/t, 2810.5 ten thousand yuan of year economic benefits.

The scope of application of the present invention:

1) conveying of the primary mixture of the blast furnace of fuel injection or other Industrial Stoves.

2) standard enterprise " a kind of method of damaging balance for two distributor duct resistances ", improve balancing technique and anti-blocking technology that gas-solid is carried.

Claims

1. a method of damaging balance for two distributor duct resistances, is characterized in that: implement step by step;

1) pressure calibration:

2) to the pipeline of divider, reducing casing is installed at the bifurcated device, is made the odd even caliber be ￠ 100, the restriction orifice of ￠ 50 is installed simultaneously on the odd number pipeline, making odd even pipeline difference is 5-8 KPa, meets odd even resistance damage and is no more than 10 KPa.