CN110617710A - Furnace drying method of walking beam furnace - Google Patents
Furnace drying method of walking beam furnace Download PDFInfo
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- CN110617710A CN110617710A CN201910952942.2A CN201910952942A CN110617710A CN 110617710 A CN110617710 A CN 110617710A CN 201910952942 A CN201910952942 A CN 201910952942A CN 110617710 A CN110617710 A CN 110617710A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D1/00—Casings; Linings; Walls; Roofs
- F27D1/16—Making or repairing linings increasing the durability of linings or breaking away linings
- F27D1/1678—Increasing the durability of linings; Means for protecting
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D19/00—Arrangements of controlling devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D19/00—Arrangements of controlling devices
- F27D2019/0028—Regulation
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Abstract
The invention discloses a furnace baking method of a walking beam furnace, belonging to the field of furnace baking and comprising the following steps: preparing before baking; the furnace drying method comprises the following steps: firstly, slightly opening a front air valve of a burner and feeding air into the stepping heating furnace; slightly opening a gas valve, and feeding gas into the stepping heating furnace; then, a power supply is connected for ignition, the furnace is dried, other air valves are correspondingly opened after the fuel gas is normally ignited, and the air-fuel proportional valve adjusts the fuel gas and the air at the moment, so that the stepping heating furnace is dried in the furnace according to the furnace drying system of the furnace heating curve; cooling and extinguishing in the furnace: the furnace is cooled through a certain cooling system at first, then when the temperature in the furnace drops below 200 ℃, let the interior natural cooling of furnace, adopt reasonable intensification system and reasonable control by temperature change cooling mode to dry in the furnace in this scheme, not only the process is simple, and the furnace body can not produce crackle, fracture moreover, the furnace body shaping structure is of high quality, longe-lived.
Description
Technical Field
The invention relates to the technical field of baking furnaces, in particular to a baking method of a walking beam furnace.
Background
The walking beam furnace belongs to major safety equipment in the copper strip production, especially in the copper ingot heating process. In the construction process of the walking beam furnace, the lining brick masonry and the refractory castable contain a large amount of free water, crystal water and residual bound water, and in order to avoid the damage of the furnace wall caused by the rapid evaporation of water, a furnace drying method is adopted to slowly evaporate and separate out the free water, the crystal water and the residual bound water. The slow and uniform heating is the key to ensure the quality of the oven.
Therefore, before the production of the batch charging of the walking beam furnace, the walking beam furnace must be baked to gradually evaporate water, so as to avoid cracks and deformation of the lining and the furnace wall, which otherwise affect the service life.
Disclosure of Invention
Technical problem to be solved by the invention
The invention aims to overcome the defects in the prior art and provides a method for baking a stepping heating furnace.
Technical scheme
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
the invention relates to a furnace drying method of a walking beam furnace, which comprises the following steps:
preparation work before oven drying:
firstly, the natural gas system, the air system, the smoke exhaust system and the electric control system are installed and debugged,
then discharging redundant air or fuel gas in the furnace body;
the furnace drying method comprises the following steps:
the first step is as follows: firstly, slightly opening a front air valve of a burner and feeding air into the stepping heating furnace;
the second step is that: slightly opening a gas valve, and feeding gas into the stepping heating furnace;
the third step: then, a power supply is connected for ignition, the furnace is dried, other air valves are correspondingly opened after the fuel gas is normally ignited, and the air-fuel proportional valve adjusts the fuel gas and the air at the moment, so that the stepping heating furnace is dried in the furnace according to the furnace drying system of the furnace heating curve;
cooling and extinguishing in the furnace:
firstly, the temperature in the furnace is reduced through a certain temperature reduction system, and then when the temperature in the furnace is reduced to be below 200 ℃, the temperature in the furnace is naturally reduced.
As a further aspect of the present invention, the oven temperature-rise curve includes a low-temperature volatilization stage, a medium-temperature evaporation stage, and a high-temperature sintering stage.
As a further aspect of the present invention, a specific oven system is as follows:
the low-temperature volatilization stage comprises:
(1) normal temperature to 100 ℃, the heating rate is 5 ℃/h, and the temperature is kept at 100 ℃ for 28 hours;
(2) the temperature is 100-150 ℃, and the heating speed is 5 ℃/h; and keeping the temperature at 150 ℃ for 7 hours;
(3) the temperature is increased at the speed of 5 ℃/h at the temperature of 150-200 ℃; and keeping the temperature at 200 ℃ for 7 hours;
the medium-temperature evaporation stage comprises:
(1) the temperature is increased at the speed of 10 ℃/h at the temperature of 200-250 ℃; and keeping the temperature at 250 ℃ for 7 hours;
(2) the temperature is 250-300 ℃, and the heating speed is 10 ℃/h; and keeping the temperature at 300 ℃ for 7 hours;
(3) the temperature is 300-350 ℃, and the heating speed is 10 ℃/h; and keeping the temperature at 350 ℃ for 19 hours;
(4) the temperature is 350-400 ℃, and the heating speed is 5 ℃/h; and keeping the temperature at 400 ℃ for 28 hours;
the high-temperature sintering stage comprises:
(1) the temperature is 400-450 ℃, and the heating rate is 10 ℃/h; and keeping the temperature at 450 ℃ for 7 hours;
(2) the temperature is 450-500 ℃, and the heating speed is 10 ℃/h; and keeping the temperature at 500 ℃ for 17 hours;
(3) the temperature is 500-550 ℃, and the heating rate is 10 ℃/h; and keeping the temperature at 550 ℃ for 7 hours;
(4) the temperature is 550-600 ℃, and the heating speed is 5 ℃/h; and keeping the temperature at 600 ℃ for 16 hours;
(5) 600-650 ℃, and the heating rate is 10 ℃/h; and keeping the temperature at 650 ℃ for 7 hours;
(6) 650-700 ℃, and the heating rate is 10 ℃/h; and keeping the temperature at 700 ℃ for 7 hours;
(7) 700-750 ℃, and the heating rate is 10 ℃/h; and keeping the temperature at 750 ℃ for 7 hours;
(8) the temperature is 750-800 ℃, and the heating rate is 10 ℃/h; and keeping the temperature at 800 ℃ for 17 hours;
(9) the temperature is increased at the speed of 10 ℃/h at the temperature of 800-850 ℃; and keeping the temperature at 850 ℃ for 7 hours;
(10) the temperature is 850-900 ℃, and the heating speed is 10 ℃/h; and incubated at 900 ℃ for 45 hours.
As a further aspect of the present invention, the in-furnace cooling and flameout specifically includes:
firstly, closing a gas valve in front of a burner, stopping supplying air by a combustion fan when the furnace temperature is lower than 400 ℃, then opening a hot air diffusing valve to diffuse hot air for 10-20min, and then stopping diffusing the hot air and closing a gas main pipe valve;
and secondly, opening each bleeding valve of the gas pipe, closing the gas pipe after bleeding for 10-15min, stopping the smoke exhaust fan after the combustion-supporting fan stops supplying air for 1 ~ 3 hours, and closing the flue valve when the temperature in the furnace is reduced to below 200 ℃ so as to enable the furnace to be in a natural cooling state.
As a further aspect of the present invention, the in-furnace temperature reduction system is as follows:
(1) the temperature is 900-850 ℃, and the cooling speed is 10 ℃/h;
(2) the temperature is reduced at 850-800 ℃ at a speed of 10 ℃/h;
(3) the temperature is reduced at the speed of 12 ℃/h at the temperature of 800-740 ℃;
(4) 740-600 ℃, and the cooling speed is 28 ℃/h;
(5) the temperature is 600-500 ℃, and the cooling speed is 20 ℃/h;
(6) the temperature is 500-450 ℃, and the cooling speed is 10 ℃/h;
(7) the temperature is 450-400 ℃, and the cooling speed is 10 ℃/h;
(8) the temperature is 400-350 ℃, and the cooling speed is 10 ℃/h;
(9) the temperature is 350-300 ℃, and the cooling speed is 10 ℃/h;
(10) the temperature is reduced at a speed of 20 ℃/h at 300-200 ℃;
(11) the temperature is reduced at a speed of 20 ℃/h at 200-100 ℃;
(12) the temperature is 100-50 ℃, and the cooling speed is 10 ℃/h.
As a further aspect of the present invention, the discharging of the surplus air and fuel gas in the oven body includes:
firstly, opening a feeding furnace door and a discharging furnace door completely;
secondly, opening a purging valve on a pipeline before opening the furnace, introducing nitrogen for purging for 10-20min, closing the purging valve, and then opening a main valve on a gas pipeline;
thirdly, opening a flue butterfly valve and then opening a smoke exhaust fan; after the smoke exhaust fan normally operates, opening all air valves, and then opening the combustion-supporting fan to enable the combustion-supporting fan to operate for 5-10min to blow and sweep the pipeline; then closing all gas valves and air valves;
and fourthly, opening each gas diffusion valve of the pipeline, diffusing the gas in the pipeline for 2-15min, then closing each diffusion valve, and closing the feeding and discharging furnace doors.
Advantageous effects
Compared with the prior art, the technical scheme provided by the invention has the following remarkable effects:
(1) the invention relates to a furnace baking method of a walking beam furnace, wherein the furnace is baked in a progressive mode to ensure that a casting material is not cracked in the furnace baking process and the service life is long, and a furnace baking temperature curve comprises a low-temperature volatilization stage, a medium-temperature evaporation stage and a high-temperature sintering stage, wherein the first stage is the low-temperature volatilization stage: evaporating moisture contained in the heat insulating material and the heat-resistant material in the furnace below 200 ℃; the second stage is a medium-temperature evaporation stage: the 40 tons of water contained in the mixed casting material in about 100 tons of casting material in the whole furnace is evaporated and dried; the third stage is a high-temperature sintering stage: the casting material needs to be sintered together to form a solid body which can be used for a long time and has no crack or fracture phenomenon in the sintering process.
(2) The invention relates to a furnace baking method of a walking beam furnace, wherein the problems of cracking of a furnace body and cracking of the furnace body in the sintering process are solved in a mode of multi-stage temperature control and strict control of the temperature rise speed and the heat preservation time of each stage in a high-temperature sintering stage, wherein the temperature is preserved for a period of time when the temperature of the furnace rises to 50 ℃, more importantly, the temperature is preserved for a longer period of time when the temperature of the furnace rises to 100 ℃ in the initial stage and the final stage of the high-temperature sintering stage, and the furnace body is gradually sintered under the condition of small temperature difference through the mode of pre-preserving the temperature firstly with small temperature difference and then preserving the temperature for a long time with large temperature difference, so that the phenomena of cracking and cracking of the furnace body in the sintering process are effectively.
(3) The invention relates to a method for baking a stepping heating furnace, wherein the furnace is cooled in a temperature control mode and is cooled according to a certain cooling system, so that the phenomenon of cracks caused by overlarge temperature difference of the furnace body is effectively avoided, and when the furnace body is cooled to a certain temperature, the furnace body is naturally cooled, so that the thermal stress in the furnace body is naturally released, the thermal deformation of the furnace body is reduced, and the integral structure of the furnace body is further ensured.
Detailed Description
For a further understanding of the present invention, reference will now be made in detail to the following examples.
Example 1
The step-by-step heating furnace baking method of the embodiment comprises the following steps:
preparation work before oven drying:
firstly, the natural gas system, the air system, the smoke exhaust system and the electric control system are installed and debugged,
and then discharging the redundant air or fuel gas in the furnace body, wherein the discharging of the redundant air or fuel gas in the furnace body comprises the following steps:
firstly, opening a feeding furnace door and a discharging furnace door completely;
secondly, opening a purging valve on a pipeline before opening the furnace, introducing nitrogen for purging for 10-20min, closing the purging valve, and then opening a main valve on a gas pipeline;
thirdly, opening a flue butterfly valve and then opening a smoke exhaust fan; after the smoke exhaust fan normally operates, opening all air valves, and then opening the combustion-supporting fan to enable the combustion-supporting fan to operate for 5-10min to blow and sweep the pipeline; then closing all gas valves and air valves;
and fourthly, opening each gas diffusion valve of the pipeline, diffusing the gas in the pipeline for 2-15min, then closing each diffusion valve, closing the inlet and outlet furnace doors, and effectively discharging redundant air or gas in the furnace through the steps to avoid explosion and bring potential safety hazards.
The furnace drying method in the embodiment comprises the following steps:
the first step is as follows: firstly, slightly opening a front air valve of a burner and feeding air into the stepping heating furnace;
the second step is that: slightly opening a gas valve, and feeding gas into the stepping heating furnace;
the third step: then the power supply is connected for ignition, the furnace is baked, other air valves are opened correspondingly after the fuel gas is normally ignited, and at the moment, the air-fuel proportional valve adjusts the fuel gas and the air, so that the stepping heating furnace performs the furnace drying according to the furnace baking system of the furnace heating curve.
It should be noted that, in this embodiment, the furnace is dried in a progressive manner to ensure that the casting material is not cracked in the baking furnace process, the service life is long, and the baking furnace temperature rise curve includes a low-temperature volatilization stage, a medium-temperature evaporation stage and a high-temperature sintering stage, and this process is simple and easy to implement, wherein the first stage is a low-temperature volatilization stage: evaporating moisture contained in the heat insulating material and the heat-resistant material in the furnace below 200 ℃; the second stage is a medium-temperature evaporation stage: the 40 tons of water contained in the mixed casting material in about 100 tons of casting material in the whole furnace is evaporated and dried; the third stage is a high-temperature sintering stage: the casting material needs to be sintered together to form a solid body which can be used for a long time and has no crack or fracture phenomenon in the sintering process.
However, in the baking process, how to overcome the problems of cracks, fissures and the like in each process, the applicant summarizes the following specific baking system of the embodiment through long-term practice:
the low-temperature volatilization stage comprises:
(1) normal temperature to 100 ℃, the heating rate is 5 ℃/h, and the temperature is kept at 100 ℃ for 28 hours;
(2) the temperature is 100-150 ℃, and the heating speed is 5 ℃/h; and keeping the temperature at 150 ℃ for 7 hours;
(3) the temperature is increased at the speed of 5 ℃/h at the temperature of 150-200 ℃; and keeping the temperature at 200 ℃ for 7 hours;
in the embodiment, the furnace temperature is in the range of ~ 200 ℃ at normal temperature and is mainly used for discharging free water in the heat-insulating material and the heat-resisting material, the furnace temperature is kept at 100 ℃ for a long time, and the furnace temperature is further kept at 150 ℃ and 200 ℃ for a short time, so that the water is volatilized more fully and completely through the sectional steam volatilization process.
The medium-temperature evaporation stage comprises:
(1) the temperature is increased at the speed of 10 ℃/h at the temperature of 200-250 ℃; and keeping the temperature at 250 ℃ for 7 hours;
(2) the temperature is 250-300 ℃, and the heating speed is 10 ℃/h; and keeping the temperature at 300 ℃ for 7 hours;
(3) the temperature is 300-350 ℃, and the heating speed is 10 ℃/h; and keeping the temperature at 350 ℃ for 19 hours;
(4) the temperature is 350-400 ℃, and the heating speed is 5 ℃/h; and keeping the temperature at 400 ℃ for 28 hours;
in the process, through reasonable temperature setting, reasonable temperature rise speed and heat preservation time, crystal water in the heat preservation material and the heat-resistant material is effectively removed, and in addition, free water in the depths of the heat preservation material and the heat-resistant material can be further volatilized; more importantly, the temperature is slowly increased in the process, so that cracks are not generated in the furnace body, and the crystal water and the free water are thoroughly removed.
The high-temperature sintering stage comprises:
(1) the temperature is 400-450 ℃, and the heating rate is 10 ℃/h; and keeping the temperature at 450 ℃ for 7 hours;
(2) the temperature is 450-500 ℃, and the heating speed is 10 ℃/h; and keeping the temperature at 500 ℃ for 17 hours;
(3) the temperature is 500-550 ℃, and the heating rate is 10 ℃/h; and keeping the temperature at 550 ℃ for 7 hours;
(4) the temperature is 550-600 ℃, and the heating speed is 5 ℃/h; and keeping the temperature at 600 ℃ for 16 hours;
(5) 600-650 ℃, and the heating rate is 10 ℃/h; and keeping the temperature at 650 ℃ for 7 hours;
(6) 650-700 ℃, and the heating rate is 10 ℃/h; and keeping the temperature at 700 ℃ for 7 hours;
(7) 700-750 ℃, and the heating rate is 10 ℃/h; and keeping the temperature at 750 ℃ for 7 hours;
(8) the temperature is 750-800 ℃, and the heating rate is 10 ℃/h; and keeping the temperature at 800 ℃ for 17 hours;
(9) the temperature is increased at the speed of 10 ℃/h at the temperature of 800-850 ℃; and keeping the temperature at 850 ℃ for 7 hours;
(10) the temperature is 850-900 ℃, and the heating speed is 10 ℃/h; and incubated at 900 ℃ for 45 hours.
The high-temperature sintering stage is the most critical step in the furnace baking process, if the control is improper, the furnace body is easy to crack, and the furnace body cracks in the serious case, specifically, the problems of the furnace body cracking and the furnace body cracking in the sintering process are solved by adopting a multi-stage temperature control mode and strictly controlling the temperature rise speed and the heat preservation time in the embodiment, wherein specifically, the furnace is preserved for a period of time when the temperature rises by 50 ℃, more importantly, the furnace is preserved for a longer period of time when the temperature rises by 100 ℃ in the initial stage and the final stage of the high-temperature sintering stage, the furnace body is gradually sintered under the condition of small temperature difference through the mode of pre-preserving the temperature at a small temperature difference and then preserving the temperature for a long time at a large temperature difference, and the phenomena of the furnace body cracking and the cracking in the sintering process are effectively avoided.
Cooling and extinguishing in the furnace:
at first, lower the temperature in the stove through certain cooling system, then when the stove temperature drops to below 200 ℃, let the interior natural cooling of stove, the stove of this embodiment is cooled down and is stalled specifically and specifically includes:
firstly, closing a gas valve in front of a burner, stopping supplying air by a combustion fan when the furnace temperature is lower than 400 ℃, then opening a hot air diffusing valve to diffuse hot air for 10-20min, and then stopping diffusing the hot air and closing a gas main pipe valve;
and secondly, opening each bleeding valve of the gas pipe, closing the gas pipe after bleeding for 10-15min, stopping the smoke exhaust fan after the combustion-supporting fan stops supplying air for 1 ~ 3 hours, and closing the flue valve when the temperature in the furnace is reduced to below 200 ℃ so as to enable the furnace to be in a natural cooling state.
The in-furnace cooling system is as follows:
(1) the temperature is 900-850 ℃, and the cooling speed is 10 ℃/h;
(2) the temperature is reduced at 850-800 ℃ at a speed of 10 ℃/h;
(3) the temperature is reduced at the speed of 12 ℃/h at the temperature of 800-740 ℃;
(4) 740-600 ℃, and the cooling speed is 28 ℃/h;
(5) the temperature is 600-500 ℃, and the cooling speed is 20 ℃/h;
(6) the temperature is 500-450 ℃, and the cooling speed is 10 ℃/h;
(7) the temperature is 450-400 ℃, and the cooling speed is 10 ℃/h;
(8) the temperature is 400-350 ℃, and the cooling speed is 10 ℃/h;
(9) the temperature is 350-300 ℃, and the cooling speed is 10 ℃/h;
(10) the temperature is reduced at a speed of 20 ℃/h at 300-200 ℃;
(11) the temperature is reduced at a speed of 20 ℃/h at 200-100 ℃;
(12) the temperature is 100-50 ℃, and the cooling speed is 10 ℃/h.
The important points to be explained are: adopt the mode of control by temperature change to cool down in the stove in this embodiment, and cool down it according to certain cooling system, effectively avoided because the too big phenomenon that produces the fracture of furnace body cooling difference in temperature takes place, when falling the uniform temperature, this embodiment adopts the mode that makes the furnace body cool down naturally to make the thermal stress natural release in the furnace body, in order to reduce the heat altered shape of furnace body, and then guarantee the overall structure of furnace body.
Claims (6)
1. A furnace drying method of a walking beam furnace is characterized by comprising the following steps:
preparation work before oven drying:
firstly, the natural gas system, the air system, the smoke exhaust system and the electric control system are installed and debugged,
then discharging redundant air or fuel gas in the furnace body;
the furnace drying method comprises the following steps:
the first step is as follows: firstly, slightly opening a front air valve of a burner and feeding air into the stepping heating furnace;
the second step is that: slightly opening a gas valve, and feeding gas into the stepping heating furnace;
the third step: then, a power supply is connected for ignition, the furnace is dried, other air valves are correspondingly opened after the fuel gas is normally ignited, and the air-fuel proportional valve adjusts the fuel gas and the air at the moment, so that the stepping heating furnace is dried in the furnace according to the furnace drying system of the furnace heating curve;
cooling and extinguishing in the furnace:
firstly, the temperature in the furnace is reduced through a certain temperature reduction system, and then when the temperature in the furnace is reduced to be below 200 ℃, the temperature in the furnace is naturally reduced.
2. The method of claim 1, wherein the method comprises the steps of: the heating curve of the oven comprises a low-temperature volatilization stage, a medium-temperature evaporation stage and a high-temperature sintering stage.
3. The method of claim 2, wherein the method comprises the steps of: the specific oven drying system is as follows:
the low-temperature volatilization stage comprises:
(1) normal temperature to 100 ℃, the heating rate is 5 ℃/h, and the temperature is kept at 100 ℃ for 28 hours;
(2) the temperature is 100-150 ℃, and the heating speed is 5 ℃/h; and keeping the temperature at 150 ℃ for 7 hours;
(3) the temperature is increased at the speed of 5 ℃/h at the temperature of 150-200 ℃; and keeping the temperature at 200 ℃ for 7 hours;
the medium-temperature evaporation stage comprises:
(1) the temperature is increased at the speed of 10 ℃/h at the temperature of 200-250 ℃; and keeping the temperature at 250 ℃ for 7 hours;
(2) the temperature is 250-300 ℃, and the heating speed is 10 ℃/h; and keeping the temperature at 300 ℃ for 7 hours;
(3) the temperature is 300-350 ℃, and the heating speed is 10 ℃/h; and keeping the temperature at 350 ℃ for 19 hours;
(4) the temperature is 350-400 ℃, and the heating speed is 5 ℃/h; and keeping the temperature at 400 ℃ for 28 hours;
the high-temperature sintering stage comprises:
(1) the temperature is 400-450 ℃, and the heating rate is 10 ℃/h; and keeping the temperature at 450 ℃ for 7 hours;
(2) the temperature is 450-500 ℃, and the heating speed is 10 ℃/h; and keeping the temperature at 500 ℃ for 17 hours;
(3) the temperature is 500-550 ℃, and the heating rate is 10 ℃/h; and keeping the temperature at 550 ℃ for 7 hours;
(4) the temperature is 550-600 ℃, and the heating speed is 5 ℃/h; and keeping the temperature at 600 ℃ for 16 hours;
(5) 600-650 ℃, and the heating rate is 10 ℃/h; and keeping the temperature at 650 ℃ for 7 hours;
(6) 650-700 ℃, and the heating rate is 10 ℃/h; and keeping the temperature at 700 ℃ for 7 hours;
(7) 700-750 ℃, and the heating rate is 10 ℃/h; and keeping the temperature at 750 ℃ for 7 hours;
(8) the temperature is 750-800 ℃, and the heating rate is 10 ℃/h; and keeping the temperature at 800 ℃ for 17 hours;
(9) the temperature is increased at the speed of 10 ℃/h at the temperature of 800-850 ℃; and keeping the temperature at 850 ℃ for 7 hours;
(10) the temperature is 850-900 ℃, and the heating speed is 10 ℃/h; and incubated at 900 ℃ for 45 hours.
4. The method of claim 1, wherein the method comprises the steps of: the in-furnace cooling flameout specifically comprises:
firstly, closing a gas valve in front of a burner, stopping supplying air by a combustion fan when the furnace temperature is lower than 400 ℃, then opening a hot air diffusing valve to diffuse hot air for 10-20min, and then stopping diffusing the hot air and closing a gas main pipe valve;
and secondly, opening each bleeding valve of the gas pipe, closing the gas pipe after bleeding for 10-15min, stopping the smoke exhaust fan after the combustion-supporting fan stops supplying air for 1 ~ 3 hours, and closing the flue valve when the temperature in the furnace is reduced to below 200 ℃ so as to enable the furnace to be in a natural cooling state.
5. The method of claim 4, wherein the method comprises the steps of: the in-furnace cooling system is as follows:
(1) the temperature is 900-850 ℃, and the cooling speed is 10 ℃/h;
(2) the temperature is reduced at 850-800 ℃ at a speed of 10 ℃/h;
(3) the temperature is reduced at the speed of 12 ℃/h at the temperature of 800-740 ℃;
(4) 740-600 ℃, and the cooling speed is 28 ℃/h;
(5) the temperature is 600-500 ℃, and the cooling speed is 20 ℃/h;
(6) the temperature is 500-450 ℃, and the cooling speed is 10 ℃/h;
(7) the temperature is 450-400 ℃, and the cooling speed is 10 ℃/h;
(8) the temperature is 400-350 ℃, and the cooling speed is 10 ℃/h;
(9) the temperature is 350-300 ℃, and the cooling speed is 10 ℃/h;
(10) the temperature is reduced at a speed of 20 ℃/h at 300-200 ℃;
(11) the temperature is reduced at a speed of 20 ℃/h at 200-100 ℃;
(12) the temperature is 100-50 ℃, and the cooling speed is 10 ℃/h.
6. The method of claim 1, wherein the method comprises the steps of: the discharge of excess air and fuel gas in the oven includes:
firstly, opening a feeding furnace door and a discharging furnace door completely;
secondly, opening a purging valve on a pipeline before opening the furnace, introducing nitrogen for purging for 10-20min, closing the purging valve, and then opening a main valve on a gas pipeline;
thirdly, opening a flue butterfly valve and then opening a smoke exhaust fan; after the smoke exhaust fan normally operates, opening all air valves, and then opening the combustion-supporting fan to enable the combustion-supporting fan to operate for 5-10min to blow and sweep the pipeline; then closing all gas valves and air valves;
and fourthly, opening each gas diffusion valve of the pipeline, diffusing the gas in the pipeline for 2-15min, then closing each diffusion valve, and closing the feeding and discharging furnace doors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910952942.2A CN110617710A (en) | 2019-10-09 | 2019-10-09 | Furnace drying method of walking beam furnace |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910952942.2A CN110617710A (en) | 2019-10-09 | 2019-10-09 | Furnace drying method of walking beam furnace |
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| Publication Number | Publication Date |
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| CN110617710A true CN110617710A (en) | 2019-12-27 |
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| CN201910952942.2A Pending CN110617710A (en) | 2019-10-09 | 2019-10-09 | Furnace drying method of walking beam furnace |
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| CN (1) | CN110617710A (en) |
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