CN106524776A - Method for blowing out submerged arc furnace for long time to protect electrode - Google Patents

Abstract

The invention discloses a method for blowing out a submerged arc furnace for a long time to protect an electrode. The method comprises the following steps of: controlling electrode length and an electrode position before power failure; and after power failure, carrying out operations such as thermal insulation, anti-oxidization work and regulation on a power supply system after power transmission on the electrode. On one hand, electrode hard breakage probability caused by furnace long-time blowout is reduced, so that positive effects are brought for cost decreasing and benefit increasing of enterprises; on the other hand, unnecessary workload of staff is reduced by reducing electrode hard breakage times, so that safety risks are reduced.

Description

A kind of method of mineral hot furnace long-time protection of boiler during shutdown period electrode

Technical field

The present invention relates to ore smelting technical field, more particularly to a kind of side of mineral hot furnace long-time protection of boiler during shutdown period electrode Method.

Background technology

Easily there is electrode hard broken accident to blowing out more than 8 hours electrodes in power transmission recovery process in tradition.Cause blowing out and The rising of production cost.To preventing the pre- of electrode hard broken accident to prevent and kill off outside the management that intensifier electrode is pasted（It is dust-proof）, mainly take two Individual measure：One is to select optimum electrode paste formula, and another is to reduce heat to stop.The electrode paste of self-baking electrode during baking, Because the binding agent after coking is intended to shrink, and the solid material filled is stable at such a temperature.The difference of these physical propertys Material internal is not caused to produce thermal stress：Solid particle is subject to compression stress, and the binding agent after coking is stretched stress.

My 25MW ferrosilicon mineral hot furnace 2014 of unit two, long-time blowing out rear electrode in 2015 respectively it is hard it is disconnected 28 times, 20 Secondary, 4,750,000 yuan of direct economic loss is produced a very large impact to the benefit of company.

The content of the invention

A kind of method of mineral hot furnace long-time protection of boiler during shutdown period electrode, comprises the following steps：

Step one：To electrode length, the control of electrode position before having a power failure：According to the length of repair time, in advance to Electrode Fluctuation Amount is controlled and consumption of electrode is short；The natural perpendicularity of adjustment electrode is carried out；Electrode Pressure Slipping Volume stop after, electrode transfer to Between 500mm-800mm；

Step 2：Electrode is carried out being incubated after power failure, anti-oxidation work：Supplement furnace charge and increase charge level in stove, while will with furnace charge Electrode is buried；Brasses discharge is adjusted to the 1/3 of normal brasses discharge；Increase the height of paste column；Per phase electrode decentralization 200- 300mm；

Step 3：Power supply system is adjusted after power transmission：Power off time adopted the direct power transmission of corner connection within 8 hours；Power failure 8 When between hour to 24 hours, mode power transmission is connect using star, star connects 1/2 control of the firing electrodes time by actual furnace outage time, Switch to corner connection roasting after stable；When having a power failure more than 24 hours, mode power transmission is connect using star, star connects the firing electrodes time by actually stopping 1/2 to 1/3 control of stove time, switchs to corner connection roasting after stablizing.

Beneficial effects of the present invention：On the one hand reduce because long-time blowing out causes the probability of electrode hard breakage, be that this drops in company Potentiation, reduces cost bring positive role, and the number of times on the other hand reducing electrode hard breakage reduces the unnecessary workload of worker, drop Lower security risk.

Specific embodiment：

A kind of method of mineral hot furnace long-time protection of boiler during shutdown period electrode, comprises the following steps：

Step one：To electrode length, the control of electrode position before having a power failure：According to the length of repair time, in advance to Electrode Fluctuation Amount is controlled and by consumption of electrode short to mitigate the impact that electrode is conducted oneself with dignity；It is adjusted for electrode deflection, it is ensured that electricity The natural perpendicularity of pole, prevents electrode from causing electrode hard breakage because deflection produces reciprocal active force；After Electrode Pressure Slipping Volume stops, Electrode is transferred between 500mm-800mm, reduces the naked leakage area of electrode, anti-oxidation；In the 4th stove ferrum level-lowering after rolling To below furnace shell 300mm, it is that shutdown maintenance is ready；

Step 2：Electrode is carried out being incubated after power failure, anti-oxidation work：Supplement furnace charge and increase in stove charge level to reduce stove interior temperature Degree, while buried electrode with furnace charge；Brasses discharge is adjusted to the 1/3 of normal brasses discharge, reduces the thermal loss of electrode； Increase the height of paste column to improve the consistency of firing electrodes；Electrode oxygen in recovery process is prevented per phase electrode decentralization 200-300mm Change；

Step 3：Power supply system is adjusted after power transmission：

1. power off time is within 8 hours；

1.1 power off times in principle can be with the direct power transmission of corner connection within 8 hours.Mode is connect using star more than 8 hours in principle Power transmission.

Three-phase electrode naked leakage part is all buried after power transmission by 1.2 as far as possible, anti-oxidation.

If without hipocratic face after 1.3 power transmissions, principle whether go up lift electrode.

2nd, have a power failure more than 8 hours, less than 24 hours；

2.1 have a power failure more than 8 hours, by the way of star picks electricity

2.2 shutdown maintenances are less than 24 hours, and star connects 1/2 control of the firing electrodes time by actual furnace outage time.Star picks electricity Roasting time is controlled within the 1/2 of actual furnace outage time, when electrode load rises to Y1 levels or basically reaches the invariable power stage（Three Phase electrode secondary side voltage is constant current in 129-177, is invariable power during 177-216）When, stop after stablizing more than 20 minutes Stove prepares star and switches through corner connection work, into corner connection firing stage.

3rd, the long-time blowing out having a power failure more than 24 hours；

3.1 have a power failure more than 24 hours, by the way of star picks electricity；

More than 24 hours, star connect 1/2 to 1/3 control of the firing electrodes time by actual furnace outage time to 3.2 shutdown maintenances, specifically With reference to furnace outage time, general star connect the time less than 30 hours.Star picks electric roasting time control the 1/ of actual furnace outage time Within 2, when electrode load rises to Y1 levels or the invariable power stage is basically reached（Three-phase electrode secondary side voltage in 129-177 is Constant current, is invariable power during 177-216）When, blowing out after stablizing more than 20 minutes prepares star and switches through corner connection work, into corner connection Firing stage.

Since the method shield electrode was used from 2016, during in March, 2016-August, monthly count more than 8 hours Draw maintenance and electrode hard broken accident does not occur, my company 3# ferrosilicon mineral hot furnace is because electrical network, transformer fault blowing out are more than 140 hours More than, there is no accident of breaking firmly in electrode yet.

Claims (1)

1. a kind of method of mineral hot furnace long-time protection of boiler during shutdown period electrode, it is characterised in that comprise the following steps：

Step one：To electrode length, the control of electrode position before having a power failure：According to the length of repair time, in advance to Electrode Fluctuation Amount is controlled and consumption of electrode is short；The natural perpendicularity of adjustment electrode；Electrode Pressure Slipping Volume stop after, electrode transfer to Between 500mm-800mm；

Step 2：Electrode is carried out being incubated after power failure, anti-oxidation work：Supplement furnace charge and increase charge level in stove, while will with furnace charge Electrode is buried；Brasses discharge is adjusted to the 1/3 of normal brasses discharge；Increase the height of paste column；Electrode transfers 200-300mm；

Step 3：Power supply system is adjusted after power transmission：Power off time adopted the direct power transmission of corner connection within 8 hours；Power failure 8 When between hour to 24 hours, mode power transmission is connect using star, star connects 1/2 control of the firing electrodes time by actual furnace outage time, Switch to corner connection roasting after stable；When having a power failure more than 24 hours, mode power transmission is connect using star, star connects the firing electrodes time by actually stopping 1/2 to 1/3 control of stove time, switchs to corner connection roasting after stablizing.