CN112066736A - Method for baking double-hearth tubular heating furnace - Google Patents
Method for baking double-hearth tubular heating furnace Download PDFInfo
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- CN112066736A CN112066736A CN202010862347.2A CN202010862347A CN112066736A CN 112066736 A CN112066736 A CN 112066736A CN 202010862347 A CN202010862347 A CN 202010862347A CN 112066736 A CN112066736 A CN 112066736A
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/001—Drying-air generating units, e.g. movable, independent of drying enclosure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/004—Nozzle assemblies; Air knives; Air distributors; Blow boxes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/06—Controlling, e.g. regulating, parameters of gas supply
- F26B21/10—Temperature; Pressure
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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
- F27D2019/0006—Monitoring the characteristics (composition, quantities, temperature, pressure) of at least one of the gases of the kiln atmosphere and using it as a controlling value
- F27D2019/0018—Monitoring the temperature of the atmosphere of the kiln
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- General Engineering & Computer Science (AREA)
- Tunnel Furnaces (AREA)
Abstract
The invention discloses a method for baking a double-hearth tubular heating furnace, wherein a hearth A and a hearth B are heated to 100-200 ℃; removing natural water from the hearth A and the hearth B; heating the hearth A and the hearth B to 250 ℃; the hearth A and the hearth B are constant in temperature; heating the hearth A and the hearth B to 260-450 ℃; removing crystallization water at the temperature of the hearth A and the hearth B; controlling the temperature of the hearth A to rise to 460-800 ℃, and sintering the hearth A at constant temperature; controlling the hearth A to cool to 350 ℃; b, controlling constant-temperature sintering of a hearth; controlling the hearth B to cool to 350 ℃; synchronously cooling the hearth A and the hearth B to 200 ℃, and extinguishing a fire nozzle and a furnace of the heating furnace; when the temperature of the hearth A and the hearth B is reduced to 100 ℃, the hearth A and the hearth B are naturally cooled to normal temperature, and after the baking is finished, the baking effect can be ensured under the conditions of not changing the design parameters and the flow of the device and not increasing additional investment, the service life of the heating furnace is prolonged, and the like.
Description
Technical Field
The invention relates to a furnace drying method, in particular to a furnace drying method of a double-hearth tubular heating furnace, belonging to the field of petrochemical industry.
Background
Tubular heating furnace wide application in oil refining chemical plant, the heating furnace is in the work progress, and inside lining brick brickwork and refractory castable contain a large amount of free water, crystal water and remaining bound water, for avoiding that the furnace wall spalling, tympanic bulla, deformation or even furnace wall collapses because of the quick vaporization inflation of moisture in the in-process of putting into production, must carry out the baker to the heating furnace before putting into production, make free water, crystal water and remaining bound water slowly evaporate and separate out to carry out the sintering to the furnace wall castable under high temperature. In the process of baking the furnace, the furnace needs to be slowly and uniformly heated according to a baking curve corresponding to the characteristics of a castable product, the highest temperature of a hearth needs to be raised to 550 ℃ and kept at the constant temperature for 18 hours (the temperature rising curve of the hearth is shown in figure 2), in the process of baking the furnace, a burner in the hearth needs to be used for supplying heat to the hearth, the flame intensity of the burner is controlled by adjusting fuel (usually fuel gas or fuel oil) supplied to the burner so as to control the temperature of the hearth to be at a target temperature, at the moment, the heat radiation of the flame of the burner and the heat radiation of the inner wall of the hearth can raise the temperature of a furnace tube in the hearth, in order to prevent the furnace tube from being damaged due to the fact that the temperature of the furnace tube exceeds the designed temperature during baking, a heat-carrying medium needs to be introduced into the furnace tube to reduce the temperature of the furnace tube, two, a silencer arranged at the outlet of the furnace tube directly exhausts the air; the second method is to use oil-carried material or nitrogen as the heat-carrying medium of the oven. The hydrogenation device needs to be synchronously carried out for shortening the startup period, the drying of the reaction heating furnace and the drying of the reaction system, the reaction heating furnace can only use nitrogen as a heat carrying medium, the low-temperature nitrogen flowing in the furnace tube is used for absorbing the heat of the furnace tube to reduce the temperature of the furnace tube, and the nitrogen in the furnace tube enters a subsequent reactor and a heat exchanger after rising in temperature and is circulated back to the inlet of the furnace tube after being cooled by air cooling and then being boosted by a compressor.
If nitrogen is used as a heat-carrying medium for baking the furnace, a nitrogen circulation flow needs to be established, and the nitrogen circulation flow is as follows (see fig. 1):
compressor → shell pass of reaction product/reaction feed heat exchanger → heating furnace → tube pass of reaction product/reaction feed heat exchanger → air cooling → separator of reaction product → liquid separation tank at compressor inlet → compressor, when the reaction product/reaction feed heat exchanger is common screw thread locking ring type heat exchanger, because the heat exchange efficiency of screw thread locking ring type heat exchanger is relatively low, the temperature of nitrogen entering the inlet of furnace tube after heat exchange is also low, when the temperature of furnace hearth is up to 550 ℃, the temperature of nitrogen at furnace outlet is less than 400 ℃, the temperature of reactor is not over the designed value, can meet the requirement of furnace baking, but when the reaction product/reaction feed heat exchanger is winding tube type heat exchanger, because the heat exchange efficiency of winding tube type heat exchanger is very high, the temperature of nitrogen circulating to the furnace inlet is high, when the temperature of furnace hearth is up to 450 ℃ in the process of furnace baking, the temperature of nitrogen, the temperature of nitrogen at the outlet of the furnace reaches about 395 ℃ and is close to the design temperature of the reactor of 400 ℃, if the temperature of the hearth continues to rise, the temperature of the reactor exceeds the design temperature, so that the reactor is damaged, the temperature of the hearth cannot continue to rise according to a furnace baking curve, the furnace baking procedure cannot continue to be carried out at the moment, the furnace baking effect cannot be guaranteed, and the service life of the heating furnace is influenced.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides the method for baking the double-hearth tubular heating furnace, which has the technical characteristics of ensuring the baking effect and prolonging the service life of the heating furnace without changing the design parameters and the flow of the device and increasing the additional investment.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a furnace baking method of a double-hearth tubular heating furnace is used for completing the construction of a hearth A and a hearth B and establishing nitrogen circulating pipelines with circulating compressors of the hearth A and the hearth B, and is characterized by comprising the following steps:
the method comprises the following steps: starting a circulating compressor to establish nitrogen circulation;
step two: igniting a heating furnace nozzle to increase the temperature of a hearth, controlling the temperature of the hearth by controlling the fuel gas amount of the nozzles of the hearth A and the hearth B, and increasing the temperature of the hearth A and the hearth B to 100-200 ℃ according to the heating speed of 1-25 ℃/h;
step three: the temperature of the hearth A and the hearth B is constant for 8-72 hours, and natural water is removed;
step four: after the constant-temperature dehydration is finished, heating the hearth A and the hearth B to 250 ℃ at the speed of 1-25 ℃/h;
step five: controlling the temperature of the hearth A and the hearth B at 250 ℃, and keeping the temperature for 12-144 hours;
step six: after the constant temperature of 250 ℃, the temperature of the hearth A and the hearth B is increased to 260-450 ℃ according to the speed of 1-25 ℃/h;
step seven: the temperature of the hearth A and the hearth B is constant for 12 to 144 hours, and crystal water is removed;
step eight: after the constant-temperature dehydration is finished, controlling the hearth A to be heated to 460-800 ℃ at the speed of 1-25 ℃/h, continuously keeping the hearth B at the constant temperature for 8-144h at the stage, controlling the temperature of nitrogen at the outlet of the furnace not to exceed 400 ℃ at the stage, and enabling the outlet of the furnace to be a confluence outlet of the hearth A and the hearth B;
step nine: a, sintering a hearth for 18 hours at constant temperature; the hearth of the furnace B is continuously kept at constant temperature at the stage, and the temperature of nitrogen at the outlet of the furnace is controlled not to exceed 400 ℃ at the stage;
step ten: after the furnace A finishes constant-temperature sintering, controlling the furnace A to cool to 350 ℃ at the speed of 1-30 ℃/h, and simultaneously controlling the furnace B to heat to 460-800 ℃ at the speed of 1-25 ℃/h; controlling the temperature of nitrogen at the outlet of the furnace not to exceed 400 ℃ at this stage;
step eleven: b, controlling the hearth to be sintered for 18 hours at constant temperature, and keeping the hearth of the stage A at the constant temperature of 350 ℃ for 8-144 hours; controlling the temperature of nitrogen at the outlet of the furnace not to exceed 400 ℃ at this stage;
step twelve: after the constant-temperature sintering of the hearth B is finished, controlling the hearth B to cool to 350 ℃ at a speed of 1-30 ℃, and controlling the hearth A to keep the temperature at 350 ℃ at the stage;
step thirteen: synchronously cooling the hearth A and the hearth B to 200 ℃ at the speed of 1-30 ℃, extinguishing a fire nozzle of the heating furnace, closing a flue baffle, stopping a blower and stopping the furnace;
fourteen steps: and when the temperature of the hearth A and the hearth B is reduced to 100 ℃, opening the air door and the flue baffle plate to naturally cool to normal temperature, and finishing the furnace drying.
A furnace drying method of a double-hearth tubular heating furnace is used for completing the construction of a hearth A and a hearth B and establishing nitrogen circulating pipelines with circulating compressors of the hearth A and the hearth B, and comprises the following steps:
the method comprises the following steps: starting a circulating compressor to establish nitrogen circulation;
step two: igniting a heating furnace nozzle to increase the temperature of a hearth, controlling the temperature of the hearth by controlling the fuel gas amount of the nozzles of the hearth A and the hearth B, and increasing the temperature of the hearth A and the hearth B to 100-200 ℃ according to the heating speed of 1-25 ℃/h;
step three: the temperature of the hearth A and the hearth B is constant for 8-72 hours, and natural water is removed;
step four: after the constant temperature dehydration is finished, the temperature of the hearth A and the hearth B is increased to 260-450 ℃ according to the speed of 1-25 ℃/h;
step five: the temperature of the hearth A and the hearth B is constant for 12 to 144 hours, and crystal water is removed;
step six: after the constant-temperature dehydration is finished, controlling the hearth A to be heated to 460-800 ℃ at the speed of 1-25 ℃/h, continuously keeping the hearth B at the constant temperature for 8-144h at the stage, controlling the temperature of nitrogen at the outlet of the furnace not to exceed 400 ℃ at the stage, and enabling the outlet of the furnace to be a confluence outlet of the hearth A and the hearth B;
step seven: a, sintering a hearth for 18 hours at constant temperature; the hearth of the furnace B is continuously kept at constant temperature at the stage, and the temperature of nitrogen at the outlet of the furnace is controlled not to exceed 400 ℃ at the stage;
step eight: after the furnace A finishes constant-temperature sintering, controlling the furnace A to cool to 350 ℃ at the speed of 1-30 ℃/h, and simultaneously controlling the furnace B to heat to 460-800 ℃ at the speed of 1-25 ℃/h; controlling the temperature of nitrogen at the outlet of the furnace not to exceed 400 ℃ at this stage;
step nine: b, controlling the hearth to be sintered for 18 hours at constant temperature, and keeping the hearth of the stage A at the constant temperature of 350 ℃ for 8-144 hours; controlling the temperature of nitrogen at the outlet of the furnace not to exceed 400 ℃ at this stage;
step ten: after the constant-temperature sintering of the hearth B is finished, controlling the hearth B to cool to 350 ℃ at a speed of 1-30 ℃, and controlling the hearth A to keep the temperature at 350 ℃ at the stage;
step eleven: synchronously cooling the hearth A and the hearth B to 200 ℃ at the speed of 1-30 ℃, extinguishing a fire nozzle of the heating furnace, closing a flue baffle, stopping a blower and stopping the furnace;
step twelve: and when the temperature of the hearth A and the hearth B is reduced to 100 ℃, opening the air door and the flue baffle plate to naturally cool to normal temperature, and finishing the furnace drying.
As an improvement, the furnace baking method of the double-hearth tubular heating furnace comprises the following steps:
the method comprises the following steps: starting a circulating compressor to establish nitrogen circulation;
step two: igniting a heating furnace nozzle to increase the temperature of the hearth, controlling the temperature of the hearth by controlling the fuel gas amount of the nozzles of the hearth A and the hearth B, and increasing the temperature of the hearth A and the hearth B to 150 ℃ according to the temperature rise speed of 15 ℃/h;
step three: controlling the temperature of the hearth A and the hearth B at 150 ℃, keeping the temperature for 20 hours, and removing natural water;
step four: after dehydration at the constant temperature of 150 ℃, the temperature of the hearth A and the hearth B is increased to 250 ℃ at the speed of 15 ℃/h;
step five: controlling the temperature of the hearth A and the hearth B at 250 ℃, and keeping the temperature for 24 hours;
step six: after the constant temperature of 250 ℃, the temperature of the hearth A and the hearth B is increased to 350 ℃ at the speed of 15 ℃/h;
step seven: controlling the temperature of the hearth A and the hearth B at 350 ℃, and keeping the temperature for 24 hours to remove crystal water;
step eight: after the dehydration at the constant temperature of 350 ℃, controlling the hearth A to heat up to 550 ℃ at the speed of 15 ℃/h, continuously keeping the hearth B at the constant temperature of 350 ℃, controlling the temperature of nitrogen at the outlet of the furnace not to exceed 400 ℃ at the stage, and enabling the outlet of the furnace to be a confluence outlet of the hearth A and the hearth B;
step nine: controlling the furnace hearth at 550 ℃ and sintering for 18 hours; in the stage, the hearth of the furnace B is continuously kept at the constant temperature of 350 ℃, and the temperature of nitrogen at the outlet of the furnace is controlled not to exceed 400 ℃ in the stage;
step ten: after the furnace A finishes the constant temperature sintering at 550 ℃, controlling the furnace A to cool to 350 ℃ at a speed of 25 ℃/h, and simultaneously controlling the furnace B to heat from 350 ℃ to 550 ℃ at a speed of 15 ℃/h; controlling the temperature of nitrogen at the outlet of the furnace not to exceed 400 ℃ at this stage;
step eleven: b, controlling the furnace hearth to be sintered for 18 hours at the constant temperature of 550 ℃, and keeping the furnace hearth of the stage A at the constant temperature of 350 ℃; controlling the temperature of nitrogen at the outlet of the furnace not to exceed 400 ℃ at this stage;
step twelve: after the furnace B finishes the sintering at the constant temperature of 550 ℃, controlling the furnace B to cool to 350 ℃ at the speed of 25 ℃/h, and controlling the furnace A to keep the constant temperature of 350 ℃ at the stage;
step thirteen: synchronously cooling the hearth A and the hearth B to 200 ℃ at a speed of not more than 25 ℃/h, extinguishing a fire nozzle of the heating furnace, closing a flue baffle, stopping a blower fan to stop the furnace;
fourteen steps: and when the temperature of the hearth A and the hearth B is reduced to 100 ℃, opening the air door and the flue baffle plate to naturally cool to normal temperature, and finishing the furnace drying.
As an improvement, in the second step, the temperature of the hearth A and the hearth B is increased to 100-200 ℃ according to the temperature rising speed of 5-15 ℃/h; in the sixth step, the temperature of the hearth A and the hearth B is increased to 260-450 ℃ according to the speed of 5-15 ℃/h; step four, step eight, the heating rate is 5-15 ℃/h in step ten; in the tenth step, the twelfth step and the thirteenth step, the cooling rate is 15-25 ℃/h.
As an improvement, in the second step, the temperature of the hearth A and the hearth B is increased to 120-150 ℃ according to the heating rate of 1-25 ℃/h; in the sixth step, the temperature of the hearth A and the hearth B is increased to 300-400 ℃ according to the speed of 1-25 ℃/h; controlling the temperature of the hearth A to rise to 500-550 ℃ in the step eight, and performing the step ten: controlling the temperature of the hearth B to rise to 500-550 ℃.
As an improvement, in the third step, the constant temperature time is 12-24 h; in the fifth step, the constant temperature time is 18-48 h; in the seventh step, the constant temperature time is 18-48 h; in the eighth step and the eleventh step, the constant temperature time is 12-36 h.
As an improvement, in the step eight to the step twelve, the furnace A and the furnace B are alternately carried out at the constant temperature stage of 550 ℃.
As an improvement, in the steps eight to nine, if the temperature of the nitrogen at the furnace outlet exceeds 400 ℃, the temperature of the hearth B is reduced; in the eleventh step to the twelfth step, if the temperature of the nitrogen at the outlet of the furnace exceeds 400 ℃, the temperature of the hearth A is reduced.
As an improvement, after the construction of the hearth A and the hearth B is finished, natural ventilation drying is carried out for more than 5 days at normal temperature, or natural ventilation drying is carried out for more than 10 days at the normal temperature of more than 5 ℃, and then equipment and pipelines required by nitrogen circulation are built and installed and debugged.
In the step eight to the step twelve, the temperature rise stage of 350 ℃ to 550 ℃ and the constant temperature stage of 550 ℃ of the two hearths are alternately carried out to control the temperature of the nitrogen at the outlet of the furnace not to exceed 400 ℃, and the temperature of the nitrogen at the outlet of the furnace is the temperature of the nitrogen at the outlet of the furnace after the high-temperature nitrogen at the outlet branch pipe of the high-temperature hearth furnace and the lower-temperature nitrogen at the outlet branch pipe of the low-temperature hearth furnace are mixed.
Has the advantages that: the invention solves the technical problem that the reaction heating furnace of the hydrofining device adopting the winding pipe heat exchanger can not be dried according to the conventional method, ensures the furnace drying effect under the conditions of not changing the design parameters and the flow of the device and not increasing additional investment, and prolongs the service life of the heating furnace.
Drawings
FIG. 1 is a flow chart of a prior art oven utilizing nitrogen as a heat-carrying medium.
FIG. 2 is a prior art oven temperature rise curve.
FIG. 3 is a schematic diagram of a baking structure of the double-hearth tubular heating furnace of the present invention.
FIG. 4 is a temperature rise curve of the oven of example 7 of the present invention.
Detailed Description
The present invention will be further described below, but the present invention is not limited to the following examples.
Example 1:
a furnace baking method of a double-hearth tubular heating furnace is disclosed, as shown in figure 3, the construction of a hearth A and a hearth B is completed, and nitrogen circulation pipelines with circulation compressors are established for the hearth A and the hearth B, and the furnace baking method is characterized by comprising the following steps:
the method comprises the following steps: starting a circulating compressor to establish nitrogen circulation;
step two: igniting a heating furnace nozzle to increase the temperature of a hearth, controlling the temperature of the hearth by controlling the fuel gas amount of the nozzles of the hearth A and the hearth B, and increasing the temperature of the hearth A and the hearth B to 100 ℃ according to the heating speed of 1 ℃/h;
step three: the temperature of the hearth A and the hearth B is kept constant for 8 hours, and natural water is removed;
step four: after the constant-temperature dehydration is finished, heating the hearth A and the hearth B to 250 ℃ at the speed of 1 ℃/h;
step five: controlling the temperature of the hearth A and the hearth B at 250 ℃, and keeping the temperature for 12 hours;
step six: after the constant temperature of 250 ℃, the temperature of the hearth A and the hearth B is increased to 260 ℃ according to the speed of 1 ℃/h;
step seven: the temperature of the hearth A and the hearth B is constant for 12 hours, and crystal water is removed;
step eight: after constant-temperature dehydration is finished, controlling the temperature of a hearth A to rise to 460 ℃ at the speed of 1-25 ℃/h, continuously keeping the temperature of a hearth B at the constant temperature for 8h at the stage, controlling the temperature of nitrogen at a furnace outlet not to exceed 400 ℃ at the stage, and enabling the furnace outlet to be a confluence outlet of the hearth A and the hearth B;
step nine: a, sintering a hearth for 18 hours at constant temperature; the hearth of the furnace B is continuously kept at constant temperature at the stage, and the temperature of nitrogen at the outlet of the furnace is controlled not to exceed 400 ℃ at the stage;
step ten: after the furnace A is sintered at constant temperature, controlling the furnace A to cool to 350 ℃ at the speed of 1 ℃/h, and simultaneously controlling the furnace B to heat to 460 ℃ at the speed of 1 ℃/h; controlling the temperature of nitrogen at the outlet of the furnace not to exceed 400 ℃ at this stage;
step eleven: b, controlling the hearth to be sintered for 18 hours at constant temperature, and keeping the hearth of the stage A at the constant temperature of 350 ℃ for 8 hours; controlling the temperature of nitrogen at the outlet of the furnace not to exceed 400 ℃ at this stage;
step twelve: after the constant-temperature sintering of the hearth B is finished, controlling the hearth B to cool to 350 ℃ at the speed of 1 ℃, and controlling the hearth A to keep the constant temperature of 350 ℃ at the stage;
step thirteen: synchronously cooling the hearth A and the hearth B to 200 ℃ at the speed of 1-30 ℃, extinguishing a fire nozzle of the heating furnace, closing a flue baffle, stopping a blower and stopping the furnace;
fourteen steps: and when the temperature of the hearth A and the hearth B is reduced to 100 ℃, opening the air door and the flue baffle plate to naturally cool to normal temperature, and finishing the furnace drying.
Example 2
A furnace baking method of a double-hearth tubular heating furnace is disclosed, as shown in figure 3, the construction of a hearth A and a hearth B is completed, and nitrogen circulation pipelines with circulation compressors are established for the hearth A and the hearth B, and the furnace baking method is characterized by comprising the following steps:
the method comprises the following steps: starting a circulating compressor to establish nitrogen circulation;
step two: igniting a heating furnace nozzle to increase the temperature of the hearth, controlling the temperature of the hearth by controlling the fuel gas amount of the nozzles of the hearth A and the hearth B, and increasing the temperature of the hearth A and the hearth B to 150 ℃ according to the heating speed of 13 ℃/h;
step three: the temperature of the hearth A and the hearth B is constant for 40 hours, and natural water is removed;
step four: after the constant-temperature dehydration is finished, heating the hearth A and the hearth B to 250 ℃ at the speed of 13 ℃/h;
step five: controlling the temperature of the hearth A and the hearth B at 250 ℃, and keeping the temperature for 12-144 hours;
step six: after the constant temperature of 250 ℃, the temperature of the hearth A and the hearth B is increased to 355 ℃ according to the speed of 13 ℃/h;
step seven: the temperature of the hearth A and the hearth B is constant for 78 hours, and crystal water is removed;
step eight: after constant-temperature dehydration is finished, controlling the temperature of a hearth A to rise to 630 ℃ at the speed of 13 ℃/h, continuously keeping the temperature of a hearth B at the constant temperature for 76h at the stage, controlling the temperature of nitrogen at a furnace outlet not to exceed 400 ℃ at the stage, and enabling the furnace outlet to be a confluence outlet of the hearth A and the hearth B;
step nine: a, sintering a hearth for 18 hours at constant temperature; the hearth of the furnace B is continuously kept at constant temperature at the stage, and the temperature of nitrogen at the outlet of the furnace is controlled not to exceed 400 ℃ at the stage;
step ten: after the furnace A finishes constant-temperature sintering, controlling the furnace A to cool to 350 ℃ at a speed of 15.5 ℃/h, and simultaneously controlling the furnace B to heat to 630 ℃ at a speed of 13 ℃/h; controlling the temperature of nitrogen at the outlet of the furnace not to exceed 400 ℃ at this stage;
step eleven: b, controlling the hearth to be sintered for 18 hours at constant temperature, and keeping the hearth of the stage A at the constant temperature of 350 ℃ for 76 hours; controlling the temperature of nitrogen at the outlet of the furnace not to exceed 400 ℃ at this stage;
step twelve: after the constant-temperature sintering of the hearth B is finished, controlling the hearth B to cool to 350 ℃ at a speed of 15.5 ℃, and controlling the hearth A to keep the temperature of 350 ℃ at the stage;
step thirteen: synchronously cooling the hearth A and the hearth B to 200 ℃ at the speed of 15.5 ℃, extinguishing a fire nozzle of the heating furnace, closing a flue baffle, stopping a blower fan to blank the furnace;
fourteen steps: and when the temperature of the hearth A and the hearth B is reduced to 100 ℃, opening the air door and the flue baffle plate to naturally cool to normal temperature, and finishing the furnace drying.
Example 3
A furnace baking method of a double-hearth tubular heating furnace is disclosed, as shown in figure 3, the construction of a hearth A and a hearth B is completed, and nitrogen circulation pipelines with circulation compressors are established for the hearth A and the hearth B, and the furnace baking method is characterized by comprising the following steps:
the method comprises the following steps: starting a circulating compressor to establish nitrogen circulation;
step two: igniting a heating furnace nozzle to improve the temperature of a hearth, controlling the temperature of the hearth by controlling the fuel gas amount of the nozzles of the hearth A and the hearth B, and increasing the temperature of the hearth A and the hearth B to 200 ℃ according to the heating speed of 25 ℃/h;
step three: the temperature of the hearth A and the hearth B is kept constant for 72 hours, and natural water is removed;
step four: after the constant-temperature dehydration is finished, heating the hearth A and the hearth B to 250 ℃ at the speed of 25 ℃/h;
step five: controlling the temperature of the hearth A and the hearth B at 250 ℃, and keeping the temperature for 144 hours;
step six: after the constant temperature of 250 ℃, the temperature of the hearth A and the hearth B is increased to 450 ℃ according to the speed of 1-25 ℃/h;
step seven: the temperature of the hearth A and the hearth B is constant for 144 hours, and crystal water is removed;
step eight: after the constant-temperature dehydration is finished, controlling the temperature of a hearth A to rise to 800 ℃ at the speed of 25 ℃/h, continuously keeping the temperature of a hearth B at the constant temperature for 8-144h at the stage, controlling the temperature of nitrogen at a furnace outlet not to exceed 400 ℃ at the stage, and enabling the furnace outlet to be a confluence outlet of the hearth A and the hearth B;
step nine: a, sintering a hearth for 18 hours at constant temperature; the hearth of the furnace B is continuously kept at constant temperature at the stage, and the temperature of nitrogen at the outlet of the furnace is controlled not to exceed 400 ℃ at the stage;
step ten: after the furnace A is sintered at constant temperature, controlling the furnace A to cool to 350 ℃ at the speed of 30 ℃/h, and controlling the furnace B to heat to 800 ℃ at the speed of 1-25 ℃/h while cooling the furnace A; controlling the temperature of nitrogen at the outlet of the furnace not to exceed 400 ℃ at this stage;
step eleven: b, controlling the hearth to be sintered for 18 hours at a constant temperature, and keeping the hearth of the stage A at the constant temperature of 350 ℃ for 144 hours; controlling the temperature of nitrogen at the outlet of the furnace not to exceed 400 ℃ at this stage;
step twelve: after the constant-temperature sintering of the hearth B is finished, controlling the hearth B to cool to 350 ℃ at the speed of 30 ℃, and controlling the hearth A to keep the constant temperature of 350 ℃ at the stage;
step thirteen: synchronously cooling the hearth A and the hearth B to 200 ℃ at the speed of 1-30 ℃, extinguishing a fire nozzle of the heating furnace, closing a flue baffle, stopping a blower and stopping the furnace;
fourteen steps: and when the temperature of the hearth A and the hearth B is reduced to 100 ℃, opening the air door and the flue baffle plate to naturally cool to normal temperature, and finishing the furnace drying.
In the second step, the hearth A and the hearth B are heated to 100-200 ℃ according to the heating rate of 5-15 ℃/h; in the sixth step, the temperature of the hearth A and the hearth B is increased to 260-450 ℃ according to the speed of 5-15 ℃/h; step four, step eight, the heating rate is 5-15 ℃/h in step ten; in the tenth step, the twelfth step and the thirteenth step, the cooling rate is 15-25 ℃/h.
As an improved embodiment mode, in the second step, the temperature of the hearth A and the hearth B is increased to 120-150 ℃ according to the temperature rising speed of 1-25 ℃/h; in the sixth step, the temperature of the hearth A and the hearth B is increased to 300-400 ℃ according to the speed of 1-25 ℃/h; controlling the temperature of the hearth A to rise to 500-550 ℃ in the step eight, and performing the step ten: controlling the temperature of the hearth B to rise to 500-550 ℃.
As a modified embodiment mode, in the third step, the constant temperature time is 12-24 h; in the fifth step, the constant temperature time is 18-48 h; in the seventh step, the constant temperature time is 18-48 h; in the eighth step and the eleventh step, the constant temperature time is 12-36 h.
Example 4
A furnace baking method of a double-hearth tubular heating furnace is disclosed, as shown in figure 3, the construction of a hearth A and a hearth B is completed, and nitrogen circulation pipelines with circulation compressors are established for the hearth A and the hearth B, and the furnace baking method is characterized by comprising the following steps:
the method comprises the following steps: starting a circulating compressor to establish nitrogen circulation;
step two: igniting a heating furnace nozzle to increase the temperature of a hearth, controlling the temperature of the hearth by controlling the fuel gas amount of the nozzles of the hearth A and the hearth B, and increasing the temperature of the hearth A and the hearth B to 100 ℃ according to the heating speed of 1 ℃/h;
step three: the temperature of the hearth A and the hearth B is constant for 8-72 hours, and natural water is removed;
step four: after the constant-temperature dehydration is finished, heating the hearth A and the hearth B to 260 ℃ at the speed of 1-25 ℃/h;
step five: the temperature of the hearth A and the hearth B is constant for 12 to 144 hours, and crystal water is removed;
step six: after constant-temperature dehydration is finished, controlling the temperature of a hearth A to rise to 460 ℃ at the speed of 1-25 ℃/h, continuously keeping the temperature of a hearth B at the constant temperature for 8h at the stage, controlling the temperature of nitrogen at a furnace outlet not to exceed 400 ℃ at the stage, and enabling the furnace outlet to be a confluence outlet of the hearth A and the hearth B;
step seven: a, sintering a hearth for 18 hours at constant temperature; the hearth of the furnace B is continuously kept at constant temperature at the stage, and the temperature of nitrogen at the outlet of the furnace is controlled not to exceed 400 ℃ at the stage;
step eight: after the furnace A is sintered at constant temperature, controlling the furnace A to cool to 350 ℃ at the speed of 1 ℃/h, and simultaneously controlling the furnace B to heat to 460 ℃ at the speed of 1-25 ℃/h; controlling the temperature of nitrogen at the outlet of the furnace not to exceed 400 ℃ at this stage;
step nine: b, controlling the hearth to be sintered for 18 hours at constant temperature, and keeping the hearth of the stage A at the constant temperature of 350 ℃ for 8 hours; controlling the temperature of nitrogen at the outlet of the furnace not to exceed 400 ℃ at this stage;
step ten: after the constant-temperature sintering of the hearth B is finished, controlling the hearth B to cool to 350 ℃ at the speed of 1 ℃, and controlling the hearth A to keep the constant temperature of 350 ℃ at the stage;
step eleven: synchronously cooling the hearth A and the hearth B to 200 ℃ at the speed of 1-30 ℃, extinguishing a fire nozzle of the heating furnace, closing a flue baffle, stopping a blower and stopping the furnace;
step twelve: and when the temperature of the hearth A and the hearth B is reduced to 100 ℃, opening the air door and the flue baffle plate to naturally cool to normal temperature, and finishing the furnace drying.
Example 5
A furnace baking method of a double-hearth tubular heating furnace is disclosed, as shown in figure 3, the construction of a hearth A and a hearth B is completed, and nitrogen circulation pipelines with circulation compressors are established for the hearth A and the hearth B, and the furnace baking method is characterized by comprising the following steps:
the method comprises the following steps: starting a circulating compressor to establish nitrogen circulation;
step two: igniting a heating furnace nozzle to increase the temperature of the hearth, controlling the temperature of the hearth by controlling the fuel gas amount of the nozzles of the hearth A and the hearth B, and increasing the temperature of the hearth A and the hearth B to 150 ℃ according to the heating speed of 1-25 ℃/h;
step three: the temperature of the hearth A and the hearth B is constant for 8-72 hours, and natural water is removed;
step four: after the constant-temperature dehydration is finished, heating the hearth A and the hearth B to 355 ℃ at the speed of 13 ℃/h;
step five: the temperature of the hearth A and the hearth B is constant for 12 to 144 hours, and crystal water is removed;
step six: after constant-temperature dehydration is finished, controlling the temperature of a hearth A to rise to 630 ℃ at the speed of 1-25 ℃/h, continuously keeping the temperature of a hearth B at the constant temperature for 76h at the stage, controlling the temperature of nitrogen at a furnace outlet not to exceed 400 ℃ at the stage, and enabling the furnace outlet to be a confluence outlet of the hearth A and the hearth B;
step seven: a, sintering a hearth for 18 hours at constant temperature; the hearth of the furnace B is continuously kept at constant temperature at the stage, and the temperature of nitrogen at the outlet of the furnace is controlled not to exceed 400 ℃ at the stage;
step eight: after the furnace A finishes constant-temperature sintering, controlling the furnace A to cool to 350 ℃ at a speed of 15.5 ℃/h, and simultaneously controlling the furnace B to heat to 630 ℃ at a speed of 13 ℃/h; controlling the temperature of nitrogen at the outlet of the furnace not to exceed 400 ℃ at this stage;
step nine: b, controlling the hearth to be sintered for 18 hours at constant temperature, and keeping the hearth of the stage A at the constant temperature of 350 ℃ for 76 hours; controlling the temperature of nitrogen at the outlet of the furnace not to exceed 400 ℃ at this stage;
step ten: after the constant-temperature sintering of the hearth B is finished, controlling the hearth B to cool to 350 ℃ at a speed of 15.5 ℃, and controlling the hearth A to keep the temperature of 350 ℃ at the stage;
step eleven: synchronously cooling the hearth A and the hearth B to 200 ℃ at the speed of 15.5 ℃, extinguishing a fire nozzle of the heating furnace, closing a flue baffle, stopping a blower fan to blank the furnace;
step twelve: and when the temperature of the hearth A and the hearth B is reduced to 100 ℃, opening the air door and the flue baffle plate to naturally cool to normal temperature, and finishing the furnace drying.
Example 6
A furnace baking method of a double-hearth tubular heating furnace is disclosed, as shown in figure 3, the construction of a hearth A and a hearth B is completed, and nitrogen circulation pipelines with circulation compressors are established for the hearth A and the hearth B, and the furnace baking method is characterized by comprising the following steps:
the method comprises the following steps: starting a circulating compressor to establish nitrogen circulation;
step two: igniting a heating furnace nozzle to improve the temperature of a hearth, controlling the temperature of the hearth by controlling the fuel gas amount of the nozzles of the hearth A and the hearth B, and increasing the temperature of the hearth A and the hearth B to 200 ℃ according to the heating speed of 25 ℃/h;
step three: the temperature of the hearth A and the hearth B is constant for 8-72 hours, and natural water is removed;
step four: after the constant-temperature dehydration is finished, heating the hearth A and the hearth B to 450 ℃ at the speed of 1-25 ℃/h;
step five: the temperature of the hearth A and the hearth B is constant for 144 hours, and crystal water is removed;
step six: after the constant-temperature dehydration is finished, controlling the hearth A to be heated to 800 ℃ at the speed of 1-25 ℃/h, continuously keeping the hearth B at the constant temperature for 144h at the stage, controlling the temperature of nitrogen at the furnace outlet not to exceed 400 ℃ at the stage, and enabling the furnace outlet to be a confluence outlet of the hearth A and the hearth B;
step seven: a, sintering a hearth for 18 hours at constant temperature; the hearth of the furnace B is continuously kept at constant temperature at the stage, and the temperature of nitrogen at the outlet of the furnace is controlled not to exceed 400 ℃ at the stage;
step eight: after the furnace A is sintered at constant temperature, controlling the furnace A to cool to 350 ℃ at the speed of 30 ℃/h, and simultaneously controlling the furnace B to heat to 800 ℃ at the speed of 25 ℃/h; controlling the temperature of nitrogen at the outlet of the furnace not to exceed 400 ℃ at this stage;
step nine: b, controlling the hearth to be sintered for 18 hours at a constant temperature, and keeping the hearth of the stage A at the constant temperature of 350 ℃ for 144 hours; controlling the temperature of nitrogen at the outlet of the furnace not to exceed 400 ℃ at this stage;
step ten: after the constant-temperature sintering of the hearth B is finished, controlling the hearth B to cool to 350 ℃ at the speed of 30 ℃, and controlling the hearth A to keep the constant temperature of 350 ℃ at the stage;
step eleven: synchronously cooling the hearth A and the hearth B to 200 ℃ at the speed of 1-30 ℃, extinguishing a fire nozzle of the heating furnace, closing a flue baffle, stopping a blower and stopping the furnace;
step twelve: and when the temperature of the hearth A and the hearth B is reduced to 100 ℃, opening the air door and the flue baffle plate to naturally cool to normal temperature, and finishing the furnace drying.
Example 7
A furnace drying method of a double-hearth tubular heating furnace comprises the following steps:
the method comprises the following steps: starting a circulating compressor to establish nitrogen circulation;
step two: igniting a heating furnace nozzle to increase the temperature of the hearth, controlling the temperature of the hearth by controlling the fuel gas amount of the nozzles of the hearth A and the hearth B, and increasing the temperature of the hearth A and the hearth B to 150 ℃ according to the temperature rise speed of 15 ℃/h;
step three: controlling the temperature of the hearth A and the hearth B at 150 ℃, keeping the temperature for 20 hours, and removing natural water;
step four: after dehydration at the constant temperature of 150 ℃, the temperature of the hearth A and the hearth B is increased to 250 ℃ at the speed of 15 ℃/h;
step five: controlling the temperature of the hearth A and the hearth B at 250 ℃, and keeping the temperature for 24 hours;
step six: after the constant temperature of 250 ℃, the temperature of the hearth A and the hearth B is increased to 350 ℃ at the speed of 15 ℃/h;
step seven: controlling the temperature of the hearth A and the hearth B at 350 ℃, and keeping the temperature for 24 hours to remove crystal water;
step eight: after the dehydration at the constant temperature of 350 ℃, controlling the hearth A to heat up to 550 ℃ at the speed of 15 ℃/h, continuously keeping the hearth B at the constant temperature of 350 ℃, controlling the temperature of nitrogen at the outlet of the furnace not to exceed 400 ℃ at the stage, and enabling the outlet of the furnace to be a confluence outlet of the hearth A and the hearth B;
step nine: controlling the furnace hearth at 550 ℃ and sintering for 18 hours; in the stage, the hearth of the furnace B is continuously kept at the constant temperature of 350 ℃, and the temperature of nitrogen at the outlet of the furnace is controlled not to exceed 400 ℃ in the stage;
step ten: after the furnace A finishes the constant temperature sintering at 550 ℃, controlling the furnace A to cool to 350 ℃ at a speed of 25 ℃/h, and simultaneously controlling the furnace B to heat from 350 ℃ to 550 ℃ at a speed of 15 ℃/h; controlling the temperature of nitrogen at the outlet of the furnace not to exceed 400 ℃ at this stage;
step eleven: b, controlling the furnace hearth to be sintered for 18 hours at the constant temperature of 550 ℃, and keeping the furnace hearth of the stage A at the constant temperature of 350 ℃; controlling the temperature of nitrogen at the outlet of the furnace not to exceed 400 ℃ at this stage;
step twelve: after the furnace B finishes the sintering at the constant temperature of 550 ℃, controlling the furnace B to cool to 350 ℃ at the speed of 25 ℃/h, and controlling the furnace A to keep the constant temperature of 350 ℃ at the stage;
step thirteen: synchronously cooling the hearth A and the hearth B to 200 ℃ at a speed of not more than 25 ℃/h, extinguishing a fire nozzle of the heating furnace, closing a flue baffle, stopping a blower fan to stop the furnace;
fourteen steps: when the temperatures of the hearth A and the hearth B are reduced to 100 ℃, the air door and the flue baffle are opened to naturally cool to normal temperature, the baking is finished, for example, fig. 4 is a baking temperature rise curve of the embodiment 7 of the invention, and the hearth A and the hearth B are preferably kept at the constant temperatures of 150 ℃, 250 ℃, 350 ℃ and 550 ℃ according to the baking curve during the baking, so that the baking effect is ensured, the service life of the heating furnace is prolonged, meanwhile, the reactor is not over-designed temperature during the baking, and the damage caused by the over-temperature of the equipment is avoided.
In the step eight to the step twelve, the furnace A and the furnace B are alternately performed in 550 ℃ constant temperature stages.
As a modified embodiment, in steps eight to nine, if the temperature of the nitrogen at the furnace outlet exceeds 400 ℃, the temperature of the hearth B is reduced; in the eleventh step to the twelfth step, if the temperature of the nitrogen at the outlet of the furnace exceeds 400 ℃, the temperature of the hearth A is reduced.
As an improved embodiment mode, after the construction of the hearth A and the hearth B is finished, natural ventilation drying is carried out for more than 5 days at normal temperature, or natural ventilation drying is carried out for more than 10 days at the normal temperature of more than 5 ℃, and then equipment and pipelines required by nitrogen circulation are built and installed and debugged.
In the step eight to the step twelve, the two furnaces are alternately subjected to a 350 ℃ to 550 ℃ temperature rise stage and a 550 ℃ constant temperature stage so as to control the temperature of the furnace outlet nitrogen gas not to exceed 400 ℃, wherein the temperature of the furnace outlet nitrogen gas is the temperature of the furnace outlet nitrogen gas obtained by mixing the high-temperature nitrogen gas of the furnace outlet branch pipe of the high-temperature furnace and the lower-temperature nitrogen gas of the furnace outlet branch pipe of the low-temperature furnace.
The furnace baking effect judgment in example 3 was:
the quality detection method for the qualified oven comprises the steps of placing a castable test block in advance in a hearth before oven drying, analyzing the water content after oven drying is finished, and determining that the oven is qualified when the water content is lower than 1%.
In front of the oven, a castable test block 1 and a castable test block 2 are placed in the middle of a hearth A, and a castable test block 3 and a castable test block 4 are placed in the middle of a hearth B.
After the oven is finished and the hearth is cooled to normal temperature, taking out the test block, and detecting the water content, wherein the detection data is as follows:
| name of test | Test block | 1 | Test block 2 | Test block 3 | Test block 4 |
| Water content% | 0.78％ | 0.45％ | 0.85％ | 0.51％ |
According to the detection result, the furnace drying method can reach the furnace drying quality standard.
Finally, it should be noted that the present invention is not limited to the above embodiments, and many variations are possible. All modifications which can be derived or suggested by a person skilled in the art from the disclosure of the present invention are to be considered within the scope of the invention.
Claims (10)
1. A furnace baking method of a double-hearth tubular heating furnace is used for completing the construction of a hearth A and a hearth B and establishing nitrogen circulating pipelines with circulating compressors of the hearth A and the hearth B, and is characterized by comprising the following steps:
the method comprises the following steps: starting a circulating compressor to establish nitrogen circulation;
step two: igniting a heating furnace nozzle to increase the temperature of a hearth, controlling the temperature of the hearth by controlling the fuel gas amount of the nozzles of the hearth A and the hearth B, and increasing the temperature of the hearth A and the hearth B to 100-200 ℃ according to the heating speed of 1-25 ℃/h;
step three: the temperature of the hearth A and the hearth B is constant for 8-72 hours, and natural water is removed;
step four: after the constant-temperature dehydration is finished, heating the hearth A and the hearth B to 250 ℃ at the speed of 1-25 ℃/h;
step five: controlling the temperature of the hearth A and the hearth B at 250 ℃, and keeping the temperature for 12-144 hours;
step six: after the constant temperature of 250 ℃, the temperature of the hearth A and the hearth B is increased to 260-450 ℃ according to the speed of 1-25 ℃/h;
step seven: the temperature of the hearth A and the hearth B is constant for 12 to 144 hours, and crystal water is removed;
step eight: after the constant-temperature dehydration is finished, controlling the hearth A to be heated to 460-800 ℃ at the speed of 1-25 ℃/h, continuously keeping the hearth B at the constant temperature for 8-144h at the stage, controlling the temperature of nitrogen at the outlet of the furnace not to exceed 400 ℃ at the stage, and enabling the outlet of the furnace to be a confluence outlet of the hearth A and the hearth B;
step nine: a, sintering a hearth for 18 hours at constant temperature; the hearth of the furnace B is continuously kept at constant temperature at the stage, and the temperature of nitrogen at the outlet of the furnace is controlled not to exceed 400 ℃ at the stage;
step ten: after the furnace A finishes constant-temperature sintering, controlling the furnace A to cool to 350 ℃ at the speed of 1-30 ℃/h, and simultaneously controlling the furnace B to heat to 460-800 ℃ at the speed of 1-25 ℃/h; controlling the temperature of nitrogen at the outlet of the furnace not to exceed 400 ℃ at this stage;
step eleven: b, controlling the hearth to be sintered for 18 hours at constant temperature, and keeping the hearth of the stage A at the constant temperature of 350 ℃ for 8-144 hours; controlling the temperature of nitrogen at the outlet of the furnace not to exceed 400 ℃ at this stage;
step twelve: after the constant-temperature sintering of the hearth B is finished, controlling the hearth B to cool to 350 ℃ at a speed of 1-30 ℃, and controlling the hearth A to keep the temperature at 350 ℃ at the stage;
step thirteen: synchronously cooling the hearth A and the hearth B to 200 ℃ at the speed of 1-30 ℃, extinguishing a fire nozzle of the heating furnace, closing a flue baffle, stopping a blower and stopping the furnace;
fourteen steps: and when the temperature of the hearth A and the hearth B is reduced to 100 ℃, opening the air door and the flue baffle plate to naturally cool to normal temperature, and finishing the furnace drying.
2. A furnace baking method of a double-hearth tubular heating furnace is used for completing the construction of a hearth A and a hearth B and establishing nitrogen circulating pipelines with circulating compressors of the hearth A and the hearth B, and is characterized by comprising the following steps:
the method comprises the following steps: starting a circulating compressor to establish nitrogen circulation;
step two: igniting a heating furnace nozzle to increase the temperature of a hearth, controlling the temperature of the hearth by controlling the fuel gas amount of the nozzles of the hearth A and the hearth B, and increasing the temperature of the hearth A and the hearth B to 100-200 ℃ according to the heating speed of 1-25 ℃/h;
step three: the temperature of the hearth A and the hearth B is constant for 8-72 hours, and natural water is removed;
step four: after the constant temperature dehydration is finished, the temperature of the hearth A and the hearth B is increased to 260-450 ℃ according to the speed of 1-25 ℃/h;
step five: the temperature of the hearth A and the hearth B is constant for 12 to 144 hours, and crystal water is removed;
step six: after the constant-temperature dehydration is finished, controlling the hearth A to be heated to 460-800 ℃ at the speed of 1-25 ℃/h, continuously keeping the hearth B at the constant temperature for 8-144h at the stage, controlling the temperature of nitrogen at the outlet of the furnace not to exceed 400 ℃ at the stage, and enabling the outlet of the furnace to be a confluence outlet of the hearth A and the hearth B;
step seven: a, sintering a hearth for 18 hours at constant temperature; the hearth of the furnace B is continuously kept at constant temperature at the stage, and the temperature of nitrogen at the outlet of the furnace is controlled not to exceed 400 ℃ at the stage;
step eight: after the furnace A finishes constant-temperature sintering, controlling the furnace A to cool to 350 ℃ at the speed of 1-30 ℃/h, and simultaneously controlling the furnace B to heat to 460-800 ℃ at the speed of 1-25 ℃/h; controlling the temperature of nitrogen at the outlet of the furnace not to exceed 400 ℃ at this stage;
step nine: b, controlling the hearth to be sintered for 18 hours at constant temperature, and keeping the hearth of the stage A at the constant temperature of 350 ℃ for 8-144 hours; controlling the temperature of nitrogen at the outlet of the furnace not to exceed 400 ℃ at this stage;
step ten: after the constant-temperature sintering of the hearth B is finished, controlling the hearth B to cool to 350 ℃ at a speed of 1-30 ℃, and controlling the hearth A to keep the temperature at 350 ℃ at the stage;
step eleven: synchronously cooling the hearth A and the hearth B to 200 ℃ at the speed of 1-30 ℃, extinguishing a fire nozzle of the heating furnace, closing a flue baffle, stopping a blower and stopping the furnace;
step twelve: and when the temperature of the hearth A and the hearth B is reduced to 100 ℃, opening the air door and the flue baffle plate to naturally cool to normal temperature, and finishing the furnace drying.
3. The furnace baking method of the double-hearth tubular heating furnace according to claim 1, characterized in that the furnace baking method comprises the following steps:
the method comprises the following steps: starting a circulating compressor to establish nitrogen circulation;
step two: igniting a heating furnace nozzle to increase the temperature of the hearth, controlling the temperature of the hearth by controlling the fuel gas amount of the nozzles of the hearth A and the hearth B, and increasing the temperature of the hearth A and the hearth B to 150 ℃ according to the temperature rise speed of 15 ℃/h;
step three: controlling the temperature of the hearth A and the hearth B at 150 ℃, keeping the temperature for 20 hours, and removing natural water;
step four: after dehydration at the constant temperature of 150 ℃, the temperature of the hearth A and the hearth B is increased to 250 ℃ at the speed of 15 ℃/h;
step five: controlling the temperature of the hearth A and the hearth B at 250 ℃, and keeping the temperature for 24 hours;
step six: after the constant temperature of 250 ℃, the temperature of the hearth A and the hearth B is increased to 350 ℃ at the speed of 15 ℃/h;
step seven: controlling the temperature of the hearth A and the hearth B at 350 ℃, and keeping the temperature for 24 hours to remove crystal water;
step eight: after the dehydration at the constant temperature of 350 ℃, controlling the hearth A to heat up to 550 ℃ at the speed of 15 ℃/h, continuously keeping the hearth B at the constant temperature of 350 ℃, controlling the temperature of nitrogen at the outlet of the furnace not to exceed 400 ℃ at the stage, and enabling the outlet of the furnace to be a confluence outlet of the hearth A and the hearth B;
step nine: controlling the furnace hearth at 550 ℃ and sintering for 18 hours; in the stage, the hearth of the furnace B is continuously kept at the constant temperature of 350 ℃, and the temperature of nitrogen at the outlet of the furnace is controlled not to exceed 400 ℃ in the stage;
step ten: after the furnace A finishes the constant temperature sintering at 550 ℃, controlling the furnace A to cool to 350 ℃ at a speed of 25 ℃/h, and simultaneously controlling the furnace B to heat from 350 ℃ to 550 ℃ at a speed of 15 ℃/h; controlling the temperature of nitrogen at the outlet of the furnace not to exceed 400 ℃ at this stage;
step eleven: b, controlling the furnace hearth to be sintered for 18 hours at the constant temperature of 550 ℃, and keeping the furnace hearth of the stage A at the constant temperature of 350 ℃; controlling the temperature of nitrogen at the outlet of the furnace not to exceed 400 ℃ at this stage;
step twelve: after the furnace B finishes the sintering at the constant temperature of 550 ℃, controlling the furnace B to cool to 350 ℃ at the speed of 25 ℃/h, and controlling the furnace A to keep the constant temperature of 350 ℃ at the stage;
step thirteen: synchronously cooling the hearth A and the hearth B to 200 ℃ at a speed of not more than 25 ℃/h, extinguishing a fire nozzle of the heating furnace, closing a flue baffle, stopping a blower fan to stop the furnace;
fourteen steps: and when the temperature of the hearth A and the hearth B is reduced to 100 ℃, opening the air door and the flue baffle plate to naturally cool to normal temperature, and finishing the furnace drying.
4. The furnace baking method of the double-hearth tubular heating furnace according to claim 1, characterized in that: in the second step, the hearth A and the hearth B are heated to 100-200 ℃ according to the heating rate of 5-15 ℃/h; in the sixth step, the temperature of the hearth A and the hearth B is increased to 260-450 ℃ according to the speed of 5-15 ℃/h; step four, step eight, the heating rate is 5-15 ℃/h in step ten; in the tenth step, the twelfth step and the thirteenth step, the cooling rate is 15-25 ℃/h.
5. The furnace baking method of the double-hearth tubular heating furnace according to claim 1, characterized in that: in the second step, the hearth A and the hearth B are heated to 120-150 ℃ according to the heating rate of 1-25 ℃/h; in the sixth step, the temperature of the hearth A and the hearth B is increased to 300-400 ℃ according to the speed of 1-25 ℃/h; controlling the temperature of the hearth A to rise to 500-550 ℃ in the step eight, and performing the step ten: controlling the temperature of the hearth B to rise to 500-550 ℃.
6. The furnace baking method of the double-hearth tubular heating furnace according to claim 1, characterized in that: in the third step, the constant temperature time is 12-24 h; in the fifth step, the constant temperature time is 18-48 h; in the seventh step, the constant temperature time is 18-48 h; in the eighth step and the eleventh step, the constant temperature time is 12-36 h.
7. The furnace baking method of the double-hearth tubular heating furnace according to claim 3, characterized in that: in the step eight to the step twelve, the furnace A and the furnace B are alternately performed at the constant temperature stage of 550 ℃.
8. The furnace baking method of the double-hearth tubular heating furnace according to claim 1 or 3, characterized in that: in the eighth step, if the temperature of the nitrogen at the furnace outlet exceeds 400 ℃, the temperature of the hearth B is reduced; in the eleventh step to the twelfth step, if the temperature of the nitrogen at the outlet of the furnace exceeds 400 ℃, the temperature of the hearth A is reduced.
9. A method of baking a double-hearth tubular heating furnace according to claim 1, 2 or 3, wherein: after the construction of the hearth A and the hearth B is finished, natural ventilation drying is carried out for more than 5 days at normal temperature, or natural ventilation drying is carried out for more than 10 days at the normal temperature of more than 5 ℃, and then equipment and pipelines required by nitrogen circulation are built and installed and debugged.
10. The furnace baking method of the double-hearth tubular heating furnace according to claim 3, characterized in that: in the step eight to the step twelve, the temperature rise stage of 350 ℃ to 550 ℃ and the constant temperature stage of 550 ℃ of the two hearths are alternately carried out to control the temperature of the nitrogen at the outlet of the furnace not to exceed 400 ℃, and the temperature of the nitrogen at the outlet of the furnace is the temperature of the nitrogen at the outlet of the furnace after the high-temperature nitrogen at the outlet branch pipe of the high-temperature hearth furnace and the lower-temperature nitrogen at the outlet branch pipe of the low-temperature hearth.
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| CN112090379A (en) * | 2020-08-25 | 2020-12-18 | 浙江石油化工有限公司 | Heating furnace drying temperature control method |
| CN112097537A (en) * | 2020-08-25 | 2020-12-18 | 浙江石油化工有限公司 | Oven temperature automatic control method based on slope signal |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112090379A (en) * | 2020-08-25 | 2020-12-18 | 浙江石油化工有限公司 | Heating furnace drying temperature control method |
| CN112097537A (en) * | 2020-08-25 | 2020-12-18 | 浙江石油化工有限公司 | Oven temperature automatic control method based on slope signal |
| CN112090379B (en) * | 2020-08-25 | 2021-11-19 | 浙江石油化工有限公司 | Heating furnace drying temperature control method |
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