阅读说明：本技术 一种套筒窑烧嘴面板耐材在线修复方法 (Online repair method for refractory material of sleeve kiln burner face plate ) 是由 江书文 王绪国 于 2019-08-30 设计创作，主要内容包括：本发明涉及一种套筒窑烧嘴面板耐材在线修复方法,包括：温度检测、煤气流量调节、出料速度调节、修复等步骤。本发明提供的套筒窑烧嘴面板耐材在线修复方法,极大提升了更换面板的时间,提高了效率：原有技术更换烧嘴面板需停窑处理,耗时7天左右,新技术在线处理只需要5小时左右,大大提高了作业效率。稳定了石灰窑生产,使石灰产量稳定,保证了炼钢生产的顺行；面板寿命大大提高,降低了劳动强度；降低了对环境的污染,增加了社会效益。(The invention relates to an online repair method for refractory materials of a sleeve kiln burner face plate, which comprises the following steps: temperature detection, gas flow regulation, discharge speed regulation, repair and the like. The online repair method for the refractory material of the burner nozzle panel of the sleeve kiln greatly improves the time for replacing the panel and the efficiency: the original technology needs to stop the kiln for replacing the burner panel, the time is about 7 days, the new technology only needs about 5 hours for online treatment, and the operation efficiency is greatly improved. The production of the lime kiln is stabilized, the lime yield is stable, and the smooth operation of steel-making production is ensured; the service life of the panel is greatly prolonged, and the labor intensity is reduced; reduces the pollution to the environment and increases the social benefit.)

1. The method for repairing the refractory material of the burner face plate of the sleeve kiln on line is characterized by comprising the following steps of:

(1) and (3) temperature detection: detecting the temperature of the panel, and alarming and entering the next step if the temperature is higher than 230 ℃;

(2) adjusting the gas flow: according to the formula F = γ F_{Is provided with}Adjusting the gas flow, wherein F is the gas flow, F_{Is provided with}Is a set value of the gas flow; gamma is a coal gas adjusting parameter; the method for calculating γ is as follows: γ =1- β (t-t 0)/t 0; wherein t is the measured panel temperature, t0 is the normal panel temperature, and the value range is t0 (100 ℃, 130 ℃); beta is an adjusting coefficient and has a value range of 0.1-0.2, beta of the 1# limekiln is 0.17, beta of the 2# limekiln is 0.14, and beta of the 3# limekiln is 0.12;

(3) adjusting the discharging speed: according to the formula W = ψ W_{Is provided with}Wherein W is the discharge speed, W_{Is provided with}The set value of the discharging speed is psi, and the discharge adjusting parameter is psi; the calculation method of ψ is as follows:

when the temperature is more than 230 ℃ and less than or equal to 360 ℃, psi = theta [ (t-t 0)/t 0 ]. alpha.1, alpha.1 = 1.33;

when t is more than 360 ℃ and less than or equal to 500 ℃, ψ = theta [ (t-t 0)/t 0 ]. alpha.2, and alpha.2 = 0.84;

ψ = θ [ (t-t 0)/t 0] × α 3, α 3=0.75 when t > 500 ℃;

wherein t0 is the normal panel temperature, and the value range is t0 (100 ℃, 130 ℃); t is the measured panel temperature; theta is an adjusting coefficient and ranges from 1.2 to 1.4, theta of the 1# lime kiln ranges from 1.25, theta of the 2# lime kiln ranges from 1.31, and theta of the 3# lime kiln ranges from 1.35;

(4) preparing a refractory heat-insulating castable;

(5) disassembling the panel to be replaced;

(6) dismantling the refractory bricks and the damaged refractory materials;

(7) purging the operating area with compressed air;

(8) inserting a steel pipe to enable the center line of the steel pipe to coincide with the center line of the panel observation hole to form an observation pipe;

(9) pouring by using a prepared pouring material by adopting a low-pressure pouring machine; and carrying out the next step after the casting material is solidified;

(10) polishing the vertical surface to be flat;

(11) pressing a layer of refractory fiber on the outer side of the casting material, and reserving the positions of an observation tube and a thermocouple;

(12) installing a thermocouple;

(13) and installing the replaced panel.

2. The online repair method for the refractory material of the burner face plate of the sleeve kiln as claimed in claim 1, wherein: and (3) after the step (13), restoring the gas flow: γ =1/2 × sin (T/(2 × T0) × pi) +1/2, and the gas usage is recovered when γ = 1; where T is time and T0 is recovery time.

3. The online repair method for the refractory material of the burner face plate of the sleeve kiln as claimed in claim 1, wherein: and (3) after the step (13), recovering the discharging speed: ψ =1/2 sin (T/(2T 0)' pi) +1/2, and the original discharge speed is recovered when ψ = 1; where T is time and T0 is recovery time.

4. The online repair method for the refractory material of the burner face plate of the sleeve kiln as claimed in claim 1, wherein: the step (3) comprises calculating the lime yield, and the calculation method of the lime yield Q comprises the following steps:

Q=3600/（w*ψ+30）*g*24*（1/1000）；

wherein, Q: the daily output of a lime kiln; w: lime discharge speed; psi: discharging adjustment parameters; g: the lime amount of the push rod once is 315kg of the 1# lime kiln g, 300kg of the 2# lime kiln g and 320kg of the 3# lime kiln g.

5. The online repair method for the refractory material of the burner face plate of the sleeve kiln as claimed in claim 1, wherein: in the step (7), the purging pressure is more than or equal to 200kpa, and the purging time is more than or equal to 20 min.

6. The online repair method for the refractory material of the burner face plate of the sleeve kiln as claimed in claim 1, wherein: in the step (8), the steel pipe is made of 304 high-temperature resistant steel pipes, the diameter of the steel pipe is 100mm, and the thickness of the steel pipe is 4 mm.

7. The online repair method for the refractory material of the burner face plate of the sleeve kiln as claimed in claim 1, wherein: in the step (9), the pouring pressure is more than or equal to 0.9Mpa, and the pouring flow rate is 3-6 kg/min.

8. The online repair method for the refractory material of the burner face plate of the sleeve kiln as claimed in claim 1, wherein: in the step (10), the method further comprises cutting the observation tube to enable the observation tube to exceed the vertical plane by 5 mm.

Technical Field

The invention relates to an online repair method for refractory materials of a sleeve kiln burner face plate, and belongs to the technical field of metallurgical industrial furnaces.

Background

The active lime shaft kiln mainly comprises a sleeve kiln, a Frakas kiln, a Maerz kiln and the like, and the annular sleeve kiln is a kiln type commonly used for producing active lime at home and abroad at present and has the advantages of environmental protection, safety, energy conservation, good product quality, high equipment operation rate and the like. A circular sleeve is sleeved into the upper sleeve and the lower sleeve to form an annular space which is used as a heating decomposition space for roasting limestone. 12 combustion chambers are distributed around the outer sleeve in a vertically staggered manner to provide required heat for limestone decomposition, air supply in the kiln is adjusted through a high-temperature fan, a driving fan and other equipment, and a preheating zone, an upper countercurrent calcining zone, a middle countercurrent calcining zone, a parallel flow calcining zone and a cooling zone are formed in an annular space in the sleeve kiln, so that the lime is completely calcined.

The 500TPD muffle is a form of construction in a shaft kiln, the refractory design starts from a +11m platform and ends at +37.375m, the total refractory design height is 26.375 m. The lining of the sleeve kiln is also divided into a working layer, a protective layer and a heat insulation layer. The preheating zone and the cooling zone are relatively low in temperature, mainly bear material impact and smoke gas scouring abrasion, mainly adopt clay bricks and high-alumina bricks, but adopt refractory materials with excellent spalling resistance and wear resistance, such as phosphate-bonded clay bricks, sillimanite bricks and high-quality high-alumina bricks, along with the requirements of causticization of operating conditions and great prolonging of service life. The calcining zone has higher position temperature, and high-quality high-alumina bricks and alkaline refractory materials, namely magnesia bricks with good slag resistance, alkaline resistance and wear resistance are selected as brick linings for building. The combustion chamber and the gap bridge are directly contacted with flame, and high-quality magnesia-alumina spinel bricks are selected for use. At present, a burner panel of a combustion chamber adopts clay heat insulation bricks NF2 bricks built around the burner brick, a magnesium aluminate spinel brick is arranged at the inner side of the combustion chamber, a layer of refractory fiber with the thickness of 15mm is adhered to the outer side of the NF2 brick, and finally, the burner panel is pressed and fixed by bolts. Since the kiln is opened after the overhaul of the No. 3 sleeve kiln, the clay heat-insulating brick NF2 brick has insufficient high-temperature strength, and the phenomena of shrinkage and sintering occur in the high-temperature state of a combustion chamber, so that the damage is fast, and high-temperature air flow is rapidly conducted to a burner panel to cause the burner panel to be red and damaged. The panel begins to change color after 20 months, the temperature rises, the panel becomes black after 24 months, the temperature gradually rises to more than 400 ℃, and the situation of burning-through of the steel plate occurs in severe places. The existing furnace kiln has long service life and tight production task, and can not be stopped. After the refractory material of the burner nozzle panel is damaged, outside air directly enters the combustion chamber, the combustion effect is poor, the heat consumption of gas combustion is increased, the process requirement of normal production cannot be met, and the lime yield and quality are greatly influenced. The common treatment method is kiln shutdown maintenance treatment, and burner bricks and burner panel refractory bricks are replaced, but the kiln shutdown time is at least one week, the production time of the lime kiln is wasted, the temporary solution is simply replaced, the permanent solution is not treated, and the service life of later-stage refractory materials is not long.

Disclosure of Invention

The invention aims to solve the technical problems that: the defect of the technology is overcome, and in order to reduce the influence of damage of the refractory material of the burner face plate on lime production and quality to the minimum, the on-line repair technology for the refractory material of the burner face plate of the sleeve kiln is provided.

In order to solve the technical problems, the technical scheme provided by the invention is as follows: an online repair method for refractory materials of a sleeve kiln burner face plate comprises the following steps:

(1) and (3) temperature detection: detecting the temperature of the panel, and alarming and entering the next step if the temperature is higher than 230 ℃;

(2) adjusting the gas flow: according to the formula F = γ F_{Is provided with}Adjusting the gas flow, wherein F is the gas flow, F_{Is provided with}Is a set value of the gas flow; gamma is a coal gas adjusting parameter; the method for calculating γ is as follows: γ =1- β (t-t 0)/t 0; wherein t is the measured panel temperature, t0 is the normal panel temperature, and the value range is t0 (100 ℃, 130 ℃); beta is an adjusting coefficient and has a value range of 0.1-0.2, beta of the 1# limekiln is 0.17, beta of the 2# limekiln is 0.14, and beta of the 3# limekiln is 0.12;

(3) adjusting the discharging speed: according to the formula W = ψ W_{Is provided with}Wherein W is the discharge speed, W_{Is provided with}The set value of the discharging speed is psi, and the discharge adjusting parameter is psi; the calculation method of ψ is as follows:

when the temperature is more than 230 ℃ and less than or equal to 360 ℃, psi = theta [ (t-t 0)/t 0 ]. alpha.1, alpha.1 = 1.33;

when t is more than 360 ℃ and less than or equal to 500 ℃, ψ = theta [ (t-t 0)/t 0 ]. alpha.2, and alpha.2 = 0.84;

ψ = θ [ (t-t 0)/t 0] × α 3, α 3=0.75 when t > 500 ℃;

wherein t0 is the normal panel temperature, and the value range is t0 (100 ℃, 130 ℃); t is the measured panel temperature; theta is an adjusting coefficient and ranges from 1.2 to 1.4, theta of the 1# lime kiln ranges from 1.25, theta of the 2# lime kiln ranges from 1.31, and theta of the 3# lime kiln ranges from 1.35;

(4) preparing a refractory heat-insulating castable;

(5) disassembling the panel to be replaced;

(6) dismantling the refractory bricks and the damaged refractory materials;

(7) purging the operating area with compressed air;

(8) inserting a steel pipe to enable the center line of the steel pipe to coincide with the center line of the panel observation hole to form an observation pipe;

(9) pouring by using a prepared pouring material by adopting a low-pressure pouring machine; and carrying out the next step after the casting material is solidified;

(10) polishing the vertical surface to be flat;

(11) pressing a layer of refractory fiber on the outer side of the casting material, and reserving the positions of an observation tube and a thermocouple;

(12) installing a thermocouple;

(13) and installing the replaced panel.

The scheme is further improved in that: and (3) after the step (13), restoring the gas flow: γ =1/2 × sin (T/(2 × T0) × pi) +1/2, and the gas usage is recovered when γ = 1; where T is time and T0 is recovery time.

The scheme is further improved in that: and (3) after the step (13), recovering the discharging speed: ψ =1/2 sin (T/(2T 0)' pi) +1/2, and the original discharge speed is recovered when ψ = 1; where T is time and T0 is recovery time.

The scheme is further improved in that: the step (3) comprises calculating the lime yield, and the calculation method of the lime yield Q comprises the following steps:

Q=3600/（w*ψ+30）*g*24*（1/1000）；

wherein, Q: the daily output of a lime kiln; w: lime discharge speed; psi: discharging adjustment parameters; g: the lime amount of the push rod once is 315kg of the 1# lime kiln g, 300kg of the 2# lime kiln g and 320kg of the 3# lime kiln g.

The scheme is further improved in that: in the step (7), the purging pressure is more than or equal to 200kpa, and the purging time is more than or equal to 20 min.

The scheme is further improved in that: in the step (8), the steel pipe is made of 304 high-temperature resistant steel pipes, the diameter of the steel pipe is 100mm, and the thickness of the steel pipe is 4 mm.

The scheme is further improved in that: in the step (9), the pouring pressure is more than or equal to 0.9Mpa, and the pouring flow rate is 3-6 kg/min.

The scheme is further improved in that: in the step (10), the method further comprises cutting the observation tube to enable the observation tube to exceed the vertical plane by 5 mm.

The online repair method for the refractory material of the burner nozzle panel of the sleeve kiln greatly improves the time for replacing the panel and the efficiency: the original technology needs to stop the kiln for replacing the burner panel, the time is about 7 days, the new technology only needs about 5 hours for online treatment, and the operation efficiency is greatly improved. The production of the lime kiln is stabilized, the lime yield is stable, and the smooth operation of steel-making production is ensured; the service life of the panel is greatly prolonged, and the labor intensity is reduced; reduces the pollution to the environment and increases the social benefit.

Detailed Description

Examples

The online repair method for the refractory material of the burner face plate of the sleeve kiln comprises the following steps:

(1) and (3) temperature detection: detecting the temperature of the panel, and alarming and entering the next step if the temperature is higher than 230 ℃;

(2) adjusting the gas flow: according to the formula F = γ F_{Is provided with}Adjusting the gas flow, wherein F is the gas flow, F_{Is provided with}Is a set value of the gas flow; gamma is a coal gas adjusting parameter; the method for calculating γ is as follows: γ =1- β (t-t 0)/t 0; wherein t is the measured panel temperature, t0 is the normal panel temperature, and the value range is t0 (100 ℃, 130 ℃); beta is an adjusting coefficient and has a value range of 0.1-0.2, beta of the 1# limekiln is 0.17, beta of the 2# limekiln is 0.14, and beta of the 3# limekiln is 0.12;

(3) adjusting the discharging speed: according to the formula W = ψ W_{Is provided with}Wherein W is the discharge speed, W_{Is provided with}The set value of the discharging speed is psi, and the discharge adjusting parameter is psi; the calculation method of ψ is as follows:

when the temperature is more than 230 ℃ and less than or equal to 360 ℃, psi = theta [ (t-t 0)/t 0 ]. alpha.1, alpha.1 = 1.33;

when t is more than 360 ℃ and less than or equal to 500 ℃, ψ = theta [ (t-t 0)/t 0 ]. alpha.2, and alpha.2 = 0.84;

ψ = θ [ (t-t 0)/t 0] × α 3, α 3=0.75 when t > 500 ℃;

wherein t0 is the normal panel temperature, and the value range is t0 (100 ℃, 130 ℃); t is the measured panel temperature; theta is an adjusting coefficient and ranges from 1.2 to 1.4, theta of the 1# lime kiln ranges from 1.25, theta of the 2# lime kiln ranges from 1.31, and theta of the 3# lime kiln ranges from 1.35;

(4) preparing a refractory heat-insulating castable;

(5) disassembling the panel to be replaced;

(6) dismantling the refractory bricks and the damaged refractory materials;

(7) purging the operating area with compressed air; the purging pressure is more than or equal to 200kpa, and the purging time is more than or equal to 20 min;

(8) inserting a steel pipe to enable the center line of the steel pipe to coincide with the center line of the panel observation hole to form an observation pipe; the steel pipe is made of 304 high-temperature-resistant steel pipes, the diameter of the steel pipe is 100mm, and the thickness of the steel pipe is 4 mm;

(9) pouring by using a prepared pouring material by adopting a low-pressure pouring machine; the pouring pressure is more than or equal to 0.9Mpa, and the pouring flow rate is 3-6 kg/min; and carrying out the next step after the casting material is solidified, wherein the solidification time is more than 3 hours;

(10) cutting the observation tube to make the observation tube only exceed 5mm of the vertical surface; polishing the vertical surface to be flat;

(11) pressing a layer of refractory fiber on the outer side of the casting material, and reserving the positions of an observation tube and a thermocouple;

(12) installing a thermocouple;

(13) and installing the replaced panel.

And (3) after the step (13), restoring the gas flow: γ =1/2 × sin (T/(2 × T0) × pi) +1/2, and the gas usage is recovered when γ = 1; where T is time and T0 is recovery time.

And (3) after the step (13), recovering the discharging speed: ψ =1/2 sin (T/(2T 0)' pi) +1/2, and the original discharge speed is recovered when ψ = 1; where T is time and T0 is recovery time.

The step (3) comprises calculating the lime yield, and the calculation method of the lime yield Q comprises the following steps:

Q=3600/（w*ψ+30）*g*24*（1/1000）；

wherein, Q: the daily output of a lime kiln; w: lime discharge speed; psi: discharging adjustment parameters; g: the lime amount of the push rod once is 315kg of the 1# lime kiln g, 300kg of the 2# lime kiln g and 320kg of the 3# lime kiln g.

Taking the production of a lime kiln No. 3 (500T sleeve kiln) of 9:00 Mei steel in 6 and 20 am in 2019 as an example, the discharging speed is set to be 40 seconds, the using amount of converter gas is 11000 cubic meters per hour, and the temperature of a panel of an HMI (human machine interface) picture alarm burner is 420 ℃. And adjusting the parameters in the process of treating the refractory material of the burner nozzle panel as follows:

the calculation formula of the gas regulating coefficient gamma is as follows: γ =1- β (t-t 0)/t 0;

the parameters in the calculation formula are explained as follows:

t 0: the normal temperature range of the burner panel, t0 (100 ℃, 130 ℃), the normal temperature values of different kilns are inconsistent, and the value of t0 of the No. 3 lime kiln is 125 ℃;

t: the measured temperature of the panel, deg.C;

beta: adjusting the coefficient, wherein the value of the 3# limekiln is 0.12;

γ=1-0.12*（420-125）/125=0.717‘

then the coal gas consumption F = gamma F_{Is provided with}=0.717 × 11000=7887 cubic meter/h

The formula for calculating the lime discharge speed regulation coefficient psi is as follows:

when t =420 ℃, ψ = θ [ (t-t 0)/t 0] × α 2, α 2= 0.84;

the parameters in the calculation formula are explained as follows:

t 0: the normal temperature range of the burner panel, t0 (100 ℃, 130 ℃), the normal temperature values of different kilns are inconsistent, and the value of t0 of the No. 3 lime kiln is 125 ℃;

t: the measured temperature of the panel, deg.C;

θ: the value range of the adjusting coefficient is (1.2-1.4), the kiln conditions of different kilns are inconsistent, and the value of the 3# limekiln theta is 1.35.

ψ =1.35 × 2.36 × 0.84=2.67

The daily lime production Q = 3600/(w ψ + 30) g 24 (1/1000) =202.1 ton

The parameters in the calculation formula are explained as follows:

q: the daily output of the lime kiln is ton/day;

w: lime discharge speed, second;

Ψ: adjusting the coefficient of lime discharging speed w;

g: 7.4 the lime amount of the push rod once action is inconsistent with different kiln conditions, and the value of the 3# lime kiln g is 320 kg.

After adjustment, the subsequent repair process can be implemented.

Taking the production of a No. 2 lime kiln (500T sleeve kiln) of 12:00 MEI steel at noon in 7/20/2019 as an example, the discharging speed is set to be 45 seconds, the usage amount of converter gas is 9400 cubic meters/h, and the temperature of a panel of an HMI (human machine interface) picture alarm burner is 530 ℃. And adjusting the parameters in the process of treating the refractory material of the burner nozzle panel as follows:

the calculation formula of the gas regulating coefficient gamma is as follows: γ =1- β (t-t 0)/t 0;

the parameters in the calculation formula are explained as follows:

t 0: the normal temperature range of the burner face plate, t0 (100 ℃, 130 ℃), the normal temperature values of different kilns are inconsistent, and the t0 value of the 2# limekiln is 120 ℃;

t: the measured temperature of the panel, deg.C;

beta: adjusting coefficient, taking value 0.14;

γ=1-0.14*（530-120）/120=0.522；

then the coal gas consumption F = gamma F_{Is provided with}=0.522 × 9200=4802 cubic meters/h;

the formula for calculating the lime discharge speed regulation coefficient psi is as follows:

when t =530 ℃, ψ = θ [ (t-t 0)/t 0] × α 3, α 3= 0.75;

the parameters in the calculation formula are explained as follows:

t 0: the normal temperature range of the burner face plate, t0 (100 ℃, 130 ℃), the normal temperature values of different kilns are inconsistent, and the t0 value of the 2# limekiln is 120 ℃;

t: the measured temperature of the panel, deg.C;

θ: the value range of the adjusting coefficient is (1.2-1.4), the kiln conditions of different kilns are inconsistent, and the value of 2# limekiln theta is 1.31.

ψ =1.31 × 3.417 × 0.75= 3.357;

the daily lime production Q = 3600/(w ψ + 30) g 24 (1/1000) =143.2 tons;

the parameters in the calculation formula are explained as follows:

q: the daily output of the lime kiln is ton/day;

w: lime discharge speed, second;

Ψ: adjusting the coefficient of lime discharging speed w;

g: 7.4 the lime amount of the push rod once action is inconsistent with different kiln conditions, and the value of the 2# lime kiln g is 300 kg.

After adjustment, the subsequent repair process can be implemented.

The present invention is not limited to the above-described embodiments. All technical solutions formed by equivalent substitutions fall within the protection scope of the claims of the present invention.