CN101880896B - Method for drying carbon anode roasting furnace - Google Patents

Abstract

The invention discloses a method for drying an annular open roasting furnace, which is characterized in that: (1), a 240-hour heating curve and a 240-hour cooling curve are adopted in a roasting process; and (2), combustion racks are placed in observation holes 2 and 4 of a No.2 furnace chamber and a No.22 furnace chamber, smoke exhaust racks are placed in a No.4 furnace chamber and a No.23 furnace chamber, ignition is started from the observation holes 2 in the No.2 furnace chamber and the No.22 furnace chamber, a fourth furnace chamber is added by moving the smoke exhaust racks after three flame travel periods, ignition in the observation hole 4 is determined according to the following condition of the temperature rise to the temperature curve of the drying furnace, and after each flame travel period, the smoke exhaust rack is continuously moved and a combustion rack is added till each system has three combustion racks and forms 8-chamber operation, wherein a system travel period is 30 hours. In the method for drying the carbon anode roasting furnace, the carbon anode roasting furnace is a 38-chamber annular open roasting furnace, the technical parameters are optimized effectively, the furnace drying time is shortened, the process for converting a roasting drying furnace curve into a normal roasting production curve after the furnace drying is finished is simplified, and the furnace drying cost is reduced.

Description

A kind of method of drying carbon anode roasting furnace

Technical field

A kind of method of drying carbon anode roasting furnace relates to a kind of method of aluminum electrolysis carbon anode stoving oven baker.

Background technology

Use the carbon anode production process at aluminium, stoving oven is a very important equipment.The stoving oven baker all adopts 360 hours drying out curve of six Room operation at present, and moving period of system is 60 hours, and baker has been obtained reasonable effect after finishing.But also there is certain problem in this furnace drying method, and promptly furnace drying time is long, and it is cumbersome to convert normal baked for producing curve into from the roasting drying out curve after the baker end, and ton anode Sweet natural gas unit cost is high.

Summary of the invention

In view of this, the purpose of this invention is to provide a kind of furnace drying method of annular open roasting furnace, it is long that this method can solve furnace drying time, and baker end back converts the cumbersome problem of normal baked for producing curve into from the roasting drying out curve.

Above-mentioned purpose realizes through following proposal:

A kind of method of drying carbon anode roasting furnace is characterized in that its carbon anode roasting furnace is Room 38 annular open roasting furnaces;

(1) adopt 240 hours heating curves to be:

Fs is the temperature rise period, and 8 hours TRTs, temperature range is 60-120 ℃;

Subordinate phase is a holding-zone, and soaking time is 28 hours;

Phase III is the temperature rise period, and the TRT is 32 hours, and temperature range is 120-300 ℃;

Stage is a holding-zone, and soaking time is 23 hours;

Five-stage is the temperature rise period, and the TRT is 46 hours, and temperature range is 300-600 ℃;

The 6th stage was the temperature rise period, and the TRT is 27 hours, and temperature range is 600-800 ℃;

The 7th stage was the temperature rise period, and the TRT is 36 hours, and temperature range is 800-1150 ℃;

The 8th stage was a holding-zone, and soaking time is 40 hours;

(2) adopt 240 hours cooling curves to be:

Fs lowers the temperature naturally, and the time length is 210 hours, and temperature range is 1150-600 ℃;

Subordinate phase is for forcing cooling, and the time length is 30 hours, and temperature range is 600 a ℃-tapping temperature;

(3) burning rack is put 2# and 22# furnace chamber 2,4 vision slits, and the smoke evacuation frame is placed on 4# and 23# furnace chamber, begins igniting from 2# and 22# furnace chamber 2 vision slits; Through all after dates of 3 flame movement, moving the smoke evacuation frame increases the 4th furnace chamber, confirms the igniting of 4 vision slits if intensification does not catch up with heating curve; Every through a flame movement cycle, continue to move the smoke evacuation frame, increase burning rack; Until each system fills it up with 3 burning racks, form Room 8 running, moving period of system is 30 hours.

The method of a kind of drying carbon anode roasting furnace of the present invention; Its carbon anode roasting furnace is Room 38 annular open roasting furnaces; Optimized processing parameter effectively; Furnace drying time is short, has simplified to convert normal baked for producing curve process into from the roasting drying out curve after baker finishes, and has reduced the baker cost.

Embodiment

A kind of method of drying carbon anode roasting furnace, roasting furnace chamber are Room 38 annular open roasting furnaces, are fuel with the Sweet natural gas, and baker adopts two flame systems.

The concrete shove charge of stoving oven baker requires: 1# and 21# furnace chamber dress are given birth to piece sealing furnace chamber, and the useless piece of giving birth to of 2# and 22# furnace chamber dress is adorned qualified living piece later on from 3# and 23# furnace chamber.Furnace chamber assurance one goes out, a dress, is equipped with.Burning rack is put 2# and 22# furnace chamber 2,4 vision slits, and the smoke evacuation frame is placed on 4# and 23# furnace chamber.Begin igniting from 2# and 22# furnace chamber 2 vision slits, through 3 flame movement week after date, moving the smoke evacuation frame increases the 4th furnace chamber, whether can catch up with oven drying temperature curve the 2nd row's nozzle of confirming whether to light a fire according to heating up.Every through a flame movement cycle, continue to move the smoke evacuation frame, increase burning rack, until each system fills it up with 3 burning racks, form Room 8 running.After 8 flame movement cycle heating, first heated 2# and 21# furnace chamber begin to get into colling stages.Colling stages is divided into naturally cooling and forces cooling.The flame movement direction is a CW, from Room 1 to Room 38.

The stoving oven baker adopts and rose curve, 30 hours moving periods in 240 hours.Cooling curve 240 hours is as shown in table 1.

240 hours drying out curve of table 1

The cooling curve of baker shown in the table 2.After 1150 ℃ of insulation end of top temperature, naturally cooling 180 hours begins to force cooling 60 hours then, guarantees and can come out of the stove.

Table 2 baker cooling curve

Remarks: take off the cooling of quirk lid nature from C5 the 3rd hole, C8 forces cooling, and C9 comes out of the stove, and (C5 wherein, C8, C9 represent respectively and cool off the 5th furnace chamber of furnace chamber, the 8th furnace chamber, the 9th furnace chamber.)。

The control of baker process requires:

The scene can be implemented elastic curve according to practical situation and heated up in temperature-rise period, and the quirk top temperature is 1150 ℃ between drying-out period.The quirk cold zone temperature difference is different to be ± 20 ℃, and the quirk high-temperature zone temperature difference is different to be ± 5 ℃.Also must be noted that following operation rules and regulations:

For being ambient conditions and when causing intensification can't catch up with the baker heating curve, must guarantee the balance of each fire path temperature really.

Cause temperature to descend for mishap, when heating up again, must implement elastic curve according to practical situation and carry out the curve adjustment.

Total negative pressure is divided the negative pressure using priciple with each quirk: the benchmark negative pressure, from high to low, the reddish tone balance.

The fuel quantity at each furnace chamber upper reaches of strict control does not allow quirk that the dazzling phenomenon of turning white is arranged.

Low thermophase and middle thermophase (in 800 ℃) adopt the manual regulation gas discharge to control temperature-rise period, are main with control zero-pressure frame negative pressure.

Hot stage adopts the automatic gas discharge of regulating to control temperature-rise period, is main with control smoke evacuation frame negative pressure.

Claims (1)

1. the method for a drying carbon anode roasting furnace is characterized in that its carbon anode roasting furnace is Room 38 annular open roasting furnaces;

(1) adopt 240 hours heating curves to be:

Fs is the temperature rise period, and 8 hours TRTs, temperature range is 60-120 ℃;

Subordinate phase is a holding-zone, and soaking time is 28 hours;

Phase III is the temperature rise period, and the TRT is 32 hours, and temperature range is 120-300 ℃;

Stage is a holding-zone, and soaking time is 23 hours;

Five-stage is the temperature rise period, and the TRT is 46 hours, and temperature range is 300-600 ℃;

The 6th stage was the temperature rise period, and the TRT is 27 hours, and temperature range is 600-800 ℃;

The 7th stage was the temperature rise period, and the TRT is 36 hours, and temperature range is 800-1150 ℃;

The 8th stage was a holding-zone, and soaking time is 40 hours;

(2) adopt 240 hours cooling curves to be:

Fs lowers the temperature naturally, and the time length is 210 hours, and temperature range is 1150-600 ℃;

Subordinate phase is for forcing cooling, and the time length is 30 hours, and temperature range is 600 a ℃-tapping temperature;

(3) burning rack is put 2# and 22# furnace chamber 2,4 vision slits, and the smoke evacuation frame is placed on 4# and 23# furnace chamber, begins igniting from 2# and 22# furnace chamber 2 vision slits; Through all after dates of 3 flame movement, moving the smoke evacuation frame increases the 4th furnace chamber, confirms the igniting of 4 vision slits if intensification does not catch up with heating curve; Every through a flame movement cycle, continue to move the smoke evacuation frame, increase burning rack; Until each system fills it up with 3 burning racks, form Room 8 running, moving period of system is 30 hours.