CN113776326A - Heat treatment method and device for graphite heat exchanger - Google Patents
Heat treatment method and device for graphite heat exchanger Download PDFInfo
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- CN113776326A CN113776326A CN202111055004.6A CN202111055004A CN113776326A CN 113776326 A CN113776326 A CN 113776326A CN 202111055004 A CN202111055004 A CN 202111055004A CN 113776326 A CN113776326 A CN 113776326A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B5/00—Muffle furnaces; Retort furnaces; Other furnaces in which the charge is held completely isolated
- F27B5/02—Muffle furnaces; Retort furnaces; Other furnaces in which the charge is held completely isolated of multiple-chamber type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B5/00—Muffle furnaces; Retort furnaces; Other furnaces in which the charge is held completely isolated
- F27B5/06—Details, accessories, or equipment peculiar to furnaces of these types
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B5/00—Muffle furnaces; Retort furnaces; Other furnaces in which the charge is held completely isolated
- F27B5/06—Details, accessories, or equipment peculiar to furnaces of these types
- F27B5/14—Arrangements of heating devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B5/00—Muffle furnaces; Retort furnaces; Other furnaces in which the charge is held completely isolated
- F27B5/06—Details, accessories, or equipment peculiar to furnaces of these types
- F27B5/16—Arrangements of air or gas supply devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B5/00—Muffle furnaces; Retort furnaces; Other furnaces in which the charge is held completely isolated
- F27B5/06—Details, accessories, or equipment peculiar to furnaces of these types
- F27B5/16—Arrangements of air or gas supply devices
- F27B2005/161—Gas inflow or outflow
- F27B2005/162—Gas inflow or outflow through closable or non-closable openings of the chamber walls
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Abstract
The invention discloses a heat treatment method of a graphite heat exchanger, which comprises the steps of A, a drying treatment process before graphite dipping, B, a compression type graphite tube heat treatment process and C, an integral heat treatment process of a graphite tube heat exchanger; in each stage of treatment process, the graphite material, the profiling graphite pipe and the graphite array pipe are placed into a graphite heat exchanger heat treatment device, and heat treatment processing of different materials is realized by controlling the temperature in the graphite heat exchanger heat treatment device in stages. Through technical innovation of the traditional heat treatment process technology and production equipment of the graphite heat exchanger, a set of heat treatment process method and corresponding processing equipment of the graphite heat exchanger suitable for local climate characteristics are provided, so that the existing problems are solved, and the aim of improving the quality stability of products is fulfilled.
Description
Technical Field
The invention relates to a heat treatment method and a heat treatment device, in particular to a heat treatment method and a heat treatment device for a graphite heat exchanger.
Background
Guizhou Lanxin graphite electromechanical equipment manufacturing limited company is located in the economic development area of Fuquan city in Guizhou province and is the only innovative enterprise integrating research, development, production and sale of various high-performance graphite manufacturing chemical equipment in the southwest region at present. The graphite heat exchanger manufacturing project has good development prospect since the Guizhou, but some problems of water and soil inadequacy also appear in the production practice: because the graphite raw material is a permeable material, before the graphite raw material is processed into a graphite heat exchanger, heat treatment procedures such as drying, dipping, curing and the like are required to meet the use requirement of impermeability. The whole process needs a relatively dry operating environment, but due to the characteristics of rainy and humid climate in Guizhou, the traditional process treatment method and processing equipment cannot completely meet the process requirements, so that the product quality of the graphite heat exchanger cannot be effectively guaranteed all the time, and the problem troubles the company for many years and needs to be solved urgently.
Disclosure of Invention
The invention aims to provide a heat treatment method and a heat treatment device for a graphite heat exchanger. Through technical innovation of the traditional heat treatment process technology and production equipment of the graphite heat exchanger, a set of heat treatment process method and corresponding processing equipment of the graphite heat exchanger suitable for local climate characteristics are provided, so that the existing problems are solved, and the aim of improving the quality stability of products is fulfilled.
The technical scheme of the invention is as follows: a heat treatment method of a graphite heat exchanger comprises the steps of A, a drying treatment process before graphite dipping, B, a compression type graphite tube heat treatment process and C, an integral heat treatment process of a graphite tube heat exchanger; in each stage of treatment process, the graphite material, the profiling graphite pipe and the graphite array pipe are placed into a graphite heat exchanger heat treatment device, and heat treatment processing of different materials is realized by controlling the temperature in the graphite heat exchanger heat treatment device in stages.
In the heat treatment method of the graphite heat exchanger, the drying treatment process before graphite impregnation comprises the following steps:
a1, placing the graphite material in a heat treatment device of a graphite heat exchanger, and sealing the graphite material;
a2, heating the internal temperature of the heat treatment device of the graphite heat exchanger from room temperature to 95 ℃;
a3, heating the internal temperature of the heat treatment device of the graphite heat exchanger from 95 ℃ to 150 ℃ at the temperature rise speed of 10 +/-3 ℃/h, wherein the temperature rise time is 4.5 h;
a4, keeping the interior of the heat treatment device of the graphite heat exchanger at a constant temperature of 150 ℃ for 1 hour;
a5, closing a heating device of the graphite heat exchanger heat treatment device, cooling the graphite heat exchanger heat treatment device from 150 ℃ to +5 ℃ along with the furnace, then opening the graphite heat exchanger heat treatment device, and taking out the graphite material;
the heat treatment process of the pressed graphite tube comprises the following steps:
b1, placing the pressed graphite tube in a heat treatment device of a graphite heat exchanger and sealing the pressed graphite tube;
b2, heating the internal temperature of the heat treatment device of the graphite heat exchanger from room temperature to 100 ℃;
b3, raising the temperature in the heat treatment device of the graphite heat exchanger from 100 ℃ to 130 ℃ at a temperature rise speed of 10 ℃/h;
b4, heating the temperature in the heat treatment device of the graphite heat exchanger from 130 ℃ to 165 ℃ at a temperature rise speed of 7.8 ℃/h-8 ℃/h, wherein the temperature rise time is 4.5 h;
b5, raising the temperature in the heat treatment device of the graphite heat exchanger from 165 ℃ to 180 ℃ at the temperature rise speed of 5 ℃/h;
b6, keeping the interior of the heat treatment device of the graphite heat exchanger at the constant temperature of 180 ℃ for 4 hours;
b7, closing the heating device of the heat treatment device of the graphite heat exchanger, cooling the heat treatment device of the graphite heat exchanger from 180 ℃ to below 60 ℃ along with the furnace, then opening the heat treatment device of the graphite heat exchanger, and taking out the pressed graphite tube;
the integral heat treatment process of the graphite tubular heat exchanger comprises the following steps:
c1, placing the graphite tubular heat exchanger in a graphite heat exchanger heat treatment device and sealing the graphite tubular heat exchanger;
c2, heating the internal temperature of the graphite heat exchanger heat treatment device from room temperature to 80 ℃ at the temperature rise speed of 10 +/-5 ℃/h;
c3, heating the temperature in the heat treatment device of the graphite heat exchanger from 80 ℃ to 120 ℃ at the temperature rise speed of 5 +/-3 ℃/h, wherein the temperature rise time is 8 h;
c4, keeping the internal temperature of the heat treatment device of the graphite heat exchanger at 120-130 ℃ for 4 h;
and C5, closing the heating device of the graphite heat exchanger heat treatment device, cooling the graphite heat exchanger heat treatment device to 45 ℃ along with the furnace, then opening the graphite heat exchanger heat treatment device, and taking out the graphite tube heat exchanger.
In the heat treatment method of the graphite heat exchanger, in the step B, in the heat treatment process of the pressed graphite tube, the distance between the pressed graphite tube and a heat source in the heat treatment device of the graphite heat exchanger is more than or equal to 200 mm; and C, in the whole heat treatment process of the graphite tubular heat exchanger, the whole heat treatment process of the graphite tubular heat exchanger comprises a graphite material bonding treatment process, bonding and assembling are carried out in a drying place with the ambient temperature of 18-35 ℃ and the relative humidity of less than 80%, the bonding and assembling are carried out, standing is carried out for 48-72 h under the same ambient condition for natural curing, and then heating and curing treatment are carried out.
A graphite heat exchanger heat treatment device comprises a cuboid structure and an electric heating high-temperature treatment furnace with an opening at one end, wherein an inner wall plate is arranged on a bottom plate in the electric heating high-temperature treatment furnace and divides the interior of the electric heating high-temperature treatment furnace into an inner heating chamber and an outer hot air circulation chamber, a top plate of the electric heating high-temperature treatment furnace is provided with a fan, blades of the fan are positioned in the hot air circulation chamber, a fan corresponding hole is formed in the inner wall plate below the blades, air inlet holes are formed in the lower portions of the inner wall plates on the left side and the right side, heating plates are further arranged in the hot air circulation chambers on the left side and the right side and are connected with an automatic temperature control device, and a furnace door is arranged at the opening end of the electric heating high-temperature treatment furnace.
In the heat treatment device for the graphite heat exchanger, a plurality of fans are arranged on the top plate of the electric heating high-temperature treatment furnace at intervals along the length direction of the top plate, a plurality of groups of heating plates are arranged in the cavities on the left side and the right side of the hot air circulation cavity at intervals along the length direction of the top plate, the hot air circulation cavity is separated into a plurality of cavities by a partition plate between two adjacent groups of heating plates, and a movable partition door capable of moving along the length direction of the heating chamber is arranged in the heating chamber.
In the graphite heat exchanger heat treatment device, the bottom of the heating chamber is provided with a track extending from inside to outside, the track is provided with a rail car, and the rail car is provided with a driving device.
In the graphite heat exchanger heat treatment device, a door track is arranged on the bottom surface of the inner wall plate at the top of the heating chamber, the movable partition door is movably clamped with the door track, and a driving device is arranged on the movable partition door.
In the graphite heat exchanger heat treatment device, the wall body, the furnace door and the movable partition door which form the electric heating high-temperature treatment furnace are of three-layer structures and comprise an inner layer, a heat insulation layer and an outer layer; and a soft sealing strip is arranged at the edge of the movable partition door.
In the heat treatment device for the graphite heat exchanger, 1 fan is arranged right above the center of each chamber partitioned by the partition plate.
In the graphite heat exchanger heat treatment device, a fan corresponding hole is formed in the inner wall plate right below the blade, and the opening diameter of the fan corresponding hole is equal to the size of the blade.
The invention has the beneficial effects that: compared with the prior art, the invention has the following advantages:
1. the temperature-rise curing curve in the heat treatment method is formed by comparing, analyzing, optimizing and selecting a large amount of experimental data according to the temperature and humidity characteristics of Guizhou, and is a set of process method suitable for local climate characteristics and corresponding processing equipment.
2. The process method is applied to production practice, problems do not occur until now, the service life of average equipment of the manufactured graphite heat exchanger product is prolonged by 1.2 times, and the permeation resistance is improved by 1.1 times.
3. The working temperature of the heat treatment device can be from room temperature to 550 ℃ at most, the required temperature can be selected at will within the range, and the system automatically controls the temperature after constant temperature.
4. The whole heat treatment device is provided with a plurality of fans and a plurality of groups of heating plates, the hot air circulation cavity is divided into a plurality of cavities through the partition plates, the heating chamber is internally provided with the movable partition door, and the size of the working area can be adjusted at will through the movable partition door. Meanwhile, the bottom of the heating chamber is provided with a rail car, so that the heating chamber is suitable for mass or heavy workpieces to enter and exit. It is suitable for drying graphite material and heat treatment of graphite equipment and pipes.
5. The heat treatment method and the heat treatment device of the invention promote the quality upgrade of the graphite heat exchanger, thoroughly solve the technical problem that the humid natural environment of Guizhou province cannot meet the process requirement of the traditional graphite material impregnation and solidification, and lead the domestic graphite heat exchanger technology to be close to the foreign technology by one step.
Drawings
FIG. 1 is a schematic structural diagram of the present invention;
FIG. 2 is a schematic side view of FIG. 1;
FIG. 3 is a schematic sectional view taken along line A-A of FIG. 1;
fig. 4 is a schematic structural view of the separator.
Reference numerals: 1-an electric heating high-temperature treatment furnace, 2-an inner wall plate, 3-a heating chamber, 4-a hot air circulation chamber, 5-a fan, 6-a fan corresponding hole, 7-an air inlet hole, 8-a heating plate, 9-a furnace door, 10-a partition plate, 11-a movable partition door, 12-a track, 13-a railcar and 14-a door track.
Detailed Description
The invention is further illustrated by the following figures and examples, which are not to be construed as limiting the invention.
The embodiment of the invention comprises the following steps: a heat treatment method of a graphite heat exchanger comprises the steps of A, a drying treatment process before graphite dipping, B, a compression type graphite tube heat treatment process and C, an integral heat treatment process of a graphite tube heat exchanger; in each stage of treatment process, the graphite material, the profiling graphite pipe and the graphite array pipe are placed into a graphite heat exchanger heat treatment device, and heat treatment processing of different materials is realized by controlling the temperature in the graphite heat exchanger heat treatment device in stages.
The process of drying treatment before graphite impregnation is shown in table 1, and comprises the following steps:
a1, placing the graphite material in a heat treatment device of a graphite heat exchanger, and sealing the graphite material;
a2, heating the internal temperature of the heat treatment device of the graphite heat exchanger from room temperature to 95 ℃;
a3, heating the internal temperature of the heat treatment device of the graphite heat exchanger from 95 ℃ to 150 ℃ at the temperature rise speed of 10 +/-3 ℃/h, wherein the temperature rise time is 4.5 h;
a4, keeping the interior of the heat treatment device of the graphite heat exchanger at a constant temperature of 150 ℃ for 1 hour;
a5, closing a heating device of the graphite heat exchanger heat treatment device, cooling the graphite heat exchanger heat treatment device from 150 ℃ to room temperature plus 5 ℃ along with the furnace, then opening the graphite heat exchanger heat treatment device, and taking out the graphite material.
In the step A, the artificial graphite can absorb moisture in the air, and if the moisture is too large, the resin is affected to fill the pores, so that the artificial graphite is dried before impregnation, and graphite powder and impurities attached to the inner and surface of the pore passage of the graphite electrode are swept and cleaned before drying.
TABLE 1 temperature rise Curve of the graphite pre-impregnation drying treatment Process
The heat treatment process of the pressed graphite tube is shown in table 2, and comprises the following steps:
b1, placing the pressed graphite tube in a heat treatment device of a graphite heat exchanger and sealing the pressed graphite tube;
b2, heating the internal temperature of the heat treatment device of the graphite heat exchanger from room temperature to 100 ℃;
b3, raising the temperature in the heat treatment device of the graphite heat exchanger from 100 ℃ to 130 ℃ at a temperature rise speed of 10 ℃/h;
b4, heating the temperature in the heat treatment device of the graphite heat exchanger from 130 ℃ to 165 ℃ at a temperature rise speed of 7.8 ℃/h-8 ℃/h, wherein the temperature rise time is 4.5 h;
b5, raising the temperature in the heat treatment device of the graphite heat exchanger from 165 ℃ to 180 ℃ at the temperature rise speed of 5 ℃/h;
b6, keeping the interior of the heat treatment device of the graphite heat exchanger at the constant temperature of 180 ℃ for 4 hours;
b7, closing the heating device of the heat treatment device of the graphite heat exchanger, cooling the heat treatment device of the graphite heat exchanger from 180 ℃ to below 60 ℃ along with the furnace, then opening the heat treatment device of the graphite heat exchanger, and taking out the pressed graphite tube.
And step B, in the process of the heat treatment of the pressed graphite tube, the fluctuation range of the temperature rise curve is required to be strictly controlled to be +/-5 ℃, the time can be smoothly prolonged, but the temperature cannot be rapidly raised. The distance between the product and a heat source in the heating chamber is more than or equal to 200 mm. The product after temperature rise is naturally cooled, a furnace door can be opened at the temperature of less than or equal to 60 ℃, and the product is strictly prevented from bursting due to rapid cooling and rapid heating.
TABLE 2 temperature rise curve of heat treatment process for pressed graphite tubes
The overall heat treatment process (bonding of graphite-containing materials) of the graphite tubular heat exchanger is shown in table 3, and specifically comprises the following steps:
c1, placing the graphite tubular heat exchanger in a graphite heat exchanger heat treatment device and sealing the graphite tubular heat exchanger;
c2, heating the internal temperature of the graphite heat exchanger heat treatment device from room temperature to 80 ℃ at the temperature rise speed of 10 +/-5 ℃/h;
c3, heating the temperature in the heat treatment device of the graphite heat exchanger from 80 ℃ to 120 ℃ at the temperature rise speed of 5 +/-3 ℃/h, wherein the temperature rise time is 8 h;
c4, keeping the internal temperature of the heat treatment device of the graphite heat exchanger at 120-130 ℃ for 4 h;
and C5, closing the heating device of the graphite heat exchanger heat treatment device, cooling the graphite heat exchanger heat treatment device to 45 ℃ along with the furnace, then opening the graphite heat exchanger heat treatment device, and taking out the graphite tube heat exchanger.
And step C, in the whole heat treatment process of the graphite tubular heat exchanger, bonding and assembling are carried out in a drying place with the ambient temperature of 18-35 ℃ and the relative humidity of less than 80%, otherwise, the graphite tubular heat exchanger is regulated. And after bonding and assembling, standing for 48-72 hours under the same environmental condition for natural curing, and then carrying out heating curing treatment.
TABLE 3 temperature rise solidification curve of the overall heat treatment process of graphite tubular heat exchanger
| Temperature range (. degree.C.) | Temperature rise Rate (. degree. C./h) | Required time (h) |
| Room temperature 80% | 10 +/-5 ℃/hour | |
| 80～120 | 5 +/-3 ℃/ |
8 |
| 120～130 | |
4 |
| 130～45 | Temperature reduction with furnace | ---- |
The heat treatment device of the graphite heat exchanger mentioned in the steps has the following specific structure: as shown in the attached figures 1-4, the electric heating high-temperature treatment furnace 1 comprises a cuboid structure and an electric heating high-temperature treatment furnace 1 with an opening at one end, the interior of the electric heating high-temperature treatment furnace 1 is of a cavity structure, an inner wall plate 2 similar to the structure of the electric heating high-temperature treatment furnace 1 is arranged on an inner bottom plate of the electric heating high-temperature treatment furnace 1, the inner wall plate 2 divides the interior of the electric heating high-temperature treatment furnace 1 into an inner heating chamber 3 and an outer hot air circulation chamber 4, an axial flow type circulating fan 5 is arranged on a top plate of the electric heating high-temperature treatment furnace 1, a motor part of the fan 5 is fixedly arranged above a furnace top cover outside the furnace, a rotating shaft of the fan 5 is connected with the furnace top cover through a shaft seal, blades of the fan 5 are positioned in the hot air circulation chamber 4, and fan corresponding holes 6 are arranged on the inner wall plate 2 below the blades. A plurality of air inlet holes 7 are arranged at the lower parts of the inner wall plates 2 at the left side and the right side, a plurality of heating plates 8 are evenly arranged in the hot air circulation cavities 4 at the left side and the right side, and the heating plates 8 are fixed on the inner wall of the electric heating high-temperature treatment furnace 1. The heating plate 8 is connected with an automatic temperature control device, and the open end of the electric heating high-temperature treatment furnace 1 is provided with a furnace door 9.
When the graphite material or the graphite component needs to be dried or heat-treated, the door 9 is opened, the graphite material or the graphite component is placed in the heating chamber 3, and then the door 9 is closed so that the whole electrically-heated high-temperature treatment furnace 1 is in a closed state.
Then the heating plate 8 and the fan 5 are turned on, the heating plate 8 heats the air in the hot air circulation cavity 4, and the heated hot air drifts upwards to the fan 5. Heated air is blown into the heating chamber 3 from the fan corresponding hole 6 under the action of the blades of the fan 5, and downward pressure air is formed. The air in the heating chamber 3 enters the hot air circulation 4 through a plurality of air inlets 7 arranged at the lower part of the inner wall plate 2. The circulation is reciprocating, and forced circulation is formed in the electric heating high-temperature treatment furnace 1 to ensure that the temperature in the electric heating high-temperature treatment furnace 1 is uniform, and the temperature difference is not more than 2 ℃. The working temperature of the heat treatment device can be heated from room temperature to 550 ℃ at most, the required temperature can be selected at will within the range, and the heating speed and the constant temperature time are automatically controlled by the system.
In the whole drying and heat treatment process, the temperature inside the electric heating high-temperature treatment furnace 1 is adjusted by an automatic temperature control device. After the treatment is finished, the heating plate 8 and the fan 5 are closed, so that the interior of the electric heating high-temperature treatment furnace 1 is cooled to a specified temperature, and then the furnace door 9 is opened to take out the graphite material or the graphite component.
The roof of electrical heating high temperature treatment furnace 1 is gone up and is provided with 5 fans 5 along its length direction uniform interval, is provided with 5 hot plate 8 of group along its length direction each interval in the hot air circulation chamber 4 left and right both sides cavity, cuts off whole hot air circulation chamber 4 through baffle 10 between two sets of adjacent hot plate 8 and is 5 cavities, and every cavity length is 2 meters. The heating chamber 3 is provided with a movable partition door 11 movable in the longitudinal direction thereof. The size of the outer frame of the movable partition door 11 is matched with that of the heating chamber 3.
Internal clear size of the electric heating high-temperature treatment furnace 1: 4000mm 10000mm, because portable partition door 11 can move along heating chamber 3 length direction, when portable partition door 11 moved to heating chamber 3 innermost end, whole heating chamber 3 length had 10m at the most, can put into the component of large batch or the longer component of length this moment, and in the whole heat treatment process, all hot plate 8 and fan 5 all started. If the drying or heat treatment component or material is less or shorter, for example, the length is only 1m long, only 1 chamber with a length of 2m is needed to accommodate the component or material, at this time, the movable partition door 11 can be moved towards the oven door 9 until the position 2m away from the oven door stops, and during the drying or heat treatment process, only the heating plate 8 and the fan 5 close to the oven door 9 need to be opened.
The structure can adjust the length of the heating chamber 3 according to the number or the length of the heating components so as to adapt to the requirements of different batches and sizes of the heat treatment workpieces, utilize heat energy to the maximum extent and reduce energy consumption at the same time.
The bottom of the heating chamber 3 is laid with a truck track 12 consisting of 2 steel rails extending from inside to outside, the truck track 12 is superposed with the longitudinal central line of the electric heating high-temperature treatment furnace 1, passes through the furnace door 9 and extends to a position 15 meters outside the furnace from the furnace wall at the rear part of the electric heating high-temperature treatment furnace 1, and the truck track 12 is provided with a movable section with the length of 1.2 at the furnace door 9, and can be moved away when the furnace door is opened and closed and installed when a truck enters or exits. A plurality of railcars 13 are arranged on the track 12, wherein a driving device is arranged on the first railcar 13. The rail cars 13 are connected by pins, and in use, graphite material or graphite components are fed into the heating chamber 3 through the rail cars 13. The number of required railcars 13 can be selected according to the occupied space of the goods.
A door rail 14 is arranged on the bottom surface of the inner wall plate 2 at the top of the heating chamber 3, the movable partition door 11 is movably clamped with the door rail 14, and a driving device is arranged on the movable partition door 11. The movable partition door 11 is matched with the bottom rail car 13 for use, and the length of a working area can be adjusted at will to meet the requirements of different batches and sizes of heat treatment workpieces, so that heat energy is utilized to the maximum extent.
The wall body, the furnace door 9 and the movable partition door 11 which form the electric heating high-temperature treatment furnace 1 are all of three-layer structures and are composed of an inner layer, a heat insulation layer and an outer layer, and the heat insulation and heat preservation effects of the whole device are improved. The edge of the movable partition door 11 is provided with a soft sealing strip, so that the sealing performance is improved, and hot air in a working area is prevented from overflowing.
And 1 fan 5 is arranged right above the center of each cavity partitioned by the partition board 10, a fan corresponding hole 6 is arranged on the inner wall board 2 right below the blade of the fan 5, and the diameter of an opening of the fan corresponding hole 6 is equal to the size of the blade. The hot air can be ensured to efficiently and uniformly act on the graphite material or the graphite component.
The heating elements of the heat treatment device are respectively and uniformly arranged in 5 working areas, are respectively arranged in the hot air circulation cavities 4 at the left side and the right side and are fixed on the inner wall of the hot air circulation cavity 4, each group at each side consists of 3 heating plates 8, the heating elements are jointly formed, the heating elements are provided with automatic temperature control devices, the working temperature can be heated to 550 ℃ at most from room temperature, the required temperature can be randomly selected within the range, and the heating speed and the constant temperature time are automatically controlled by the system. The length of a working area can be adjusted at will by internally arranging the movable partition door 11 so as to meet the requirements of different batches and sizes of heat treatment workpieces, the heat energy is utilized to the maximum extent, and the rail car 13 is arranged at the bottom and is suitable for the mass or heavy workpieces to enter and exit.
Claims (10)
1. A heat treatment method of a graphite heat exchanger is characterized by comprising the following steps: comprises A, a drying treatment process before graphite dipping, B, a heat treatment process of a compression graphite tube and C, an integral heat treatment process of a graphite tube heat exchanger; in each stage of treatment process, the graphite material, the profiling graphite pipe and the graphite array pipe are placed into a graphite heat exchanger heat treatment device, and heat treatment processing of different materials is realized by controlling the temperature in the graphite heat exchanger heat treatment device in stages.
2. The heat treatment method of the graphite heat exchanger as claimed in claim 1, wherein: the drying treatment process before graphite impregnation comprises the following steps:
a1, placing the graphite material in a heat treatment device of a graphite heat exchanger, and sealing the graphite material;
a2, heating the internal temperature of the heat treatment device of the graphite heat exchanger from room temperature to 95 ℃;
a3, heating the internal temperature of the heat treatment device of the graphite heat exchanger from 95 ℃ to 150 ℃ at the temperature rise speed of 10 +/-3 ℃/h, wherein the temperature rise time is 4.5 h;
a4, keeping the interior of the heat treatment device of the graphite heat exchanger at a constant temperature of 150 ℃ for 1 hour;
a5, closing a heating device of the graphite heat exchanger heat treatment device, cooling the graphite heat exchanger heat treatment device from 150 ℃ to +5 ℃ along with the furnace, then opening the graphite heat exchanger heat treatment device, and taking out the graphite material;
the heat treatment process of the pressed graphite tube comprises the following steps:
b1, placing the pressed graphite tube in a heat treatment device of a graphite heat exchanger and sealing the pressed graphite tube;
b2, heating the internal temperature of the heat treatment device of the graphite heat exchanger from room temperature to 100 ℃;
b3, raising the temperature in the heat treatment device of the graphite heat exchanger from 100 ℃ to 130 ℃ at a temperature rise speed of 10 ℃/h;
b4, heating the temperature in the heat treatment device of the graphite heat exchanger from 130 ℃ to 165 ℃ at a temperature rise speed of 7.8 ℃/h-8 ℃/h, wherein the temperature rise time is 4.5 h;
b5, raising the temperature in the heat treatment device of the graphite heat exchanger from 165 ℃ to 180 ℃ at the temperature rise speed of 5 ℃/h;
b6, keeping the interior of the heat treatment device of the graphite heat exchanger at the constant temperature of 180 ℃ for 4 hours;
b7, closing the heating device of the heat treatment device of the graphite heat exchanger, cooling the heat treatment device of the graphite heat exchanger from 180 ℃ to below 60 ℃ along with the furnace, then opening the heat treatment device of the graphite heat exchanger, and taking out the pressed graphite tube;
the integral heat treatment process of the graphite tubular heat exchanger comprises the following steps:
c1, placing the graphite tubular heat exchanger in a graphite heat exchanger heat treatment device and sealing the graphite tubular heat exchanger;
c2, heating the internal temperature of the graphite heat exchanger heat treatment device from room temperature to 80 ℃ at the temperature rise speed of 10 +/-5 ℃/h;
c3, heating the temperature in the heat treatment device of the graphite heat exchanger from 80 ℃ to 120 ℃ at the temperature rise speed of 5 +/-3 ℃/h, wherein the temperature rise time is 8 h;
c4, keeping the internal temperature of the heat treatment device of the graphite heat exchanger at 120-130 ℃ for 4 h;
and C5, closing the heating device of the graphite heat exchanger heat treatment device, cooling the graphite heat exchanger heat treatment device to 45 ℃ along with the furnace, then opening the graphite heat exchanger heat treatment device, and taking out the graphite tube heat exchanger.
3. The heat treatment method of the graphite heat exchanger as claimed in claim 2, wherein: b, in the process of the heat treatment process of the pressed graphite tube, the distance between the pressed graphite tube and a heat source in the heat treatment device of the graphite heat exchanger is more than or equal to 200 mm; and C, in the whole heat treatment process of the graphite tubular heat exchanger, the whole heat treatment process of the graphite tubular heat exchanger comprises a graphite material bonding treatment process, bonding and assembling are carried out in a drying place with the ambient temperature of 18-35 ℃ and the relative humidity of less than 80%, the bonding and assembling are carried out, standing is carried out for 48-72 h under the same ambient condition for natural curing, and then heating and curing treatment are carried out.
4. A heat treatment apparatus for a graphite heat exchanger as claimed in any one of claims 1 to 3, characterized in that: the electric heating high-temperature treatment furnace comprises a cuboid structure and an electric heating high-temperature treatment furnace (1) with an opening at one end, wherein an inner wall plate (2) is arranged on a bottom plate in the electric heating high-temperature treatment furnace (1), the inner wall plate (2) divides the inside of the electric heating high-temperature treatment furnace (1) into an inner heating chamber (3) and an outer hot air circulation chamber (4), a fan (5) is arranged on the top plate of the electric heating high-temperature treatment furnace (1), blades of the fan (5) are positioned in the hot air circulation chamber (4), a fan corresponding hole (6) is arranged on the inner wall plate (2) below the blades, air inlet holes (7) are formed in the lower parts of the inner wall plates (2) on the left side and the right side, heating plates (8) are further arranged in the hot air circulation chambers (4) on the left side and the right side, the heating plates (8) are connected with an automatic temperature control device, and a furnace door (9) is arranged at the opening end of the electric heating high-temperature treatment furnace (1).
5. The heat treatment apparatus for a graphite heat exchanger as claimed in claim 4, wherein: the electric heating high-temperature treatment furnace is characterized in that a plurality of fans (5) are arranged on a top plate of the electric heating high-temperature treatment furnace (1) at intervals along the length direction of the top plate, a plurality of groups of heating plates (8) are arranged in chambers on the left side and the right side of a hot air circulation cavity (4) at intervals along the length direction of the top plate, the hot air circulation cavity (4) is separated into a plurality of chambers between two adjacent groups of heating plates (8) through a partition plate (10), and a movable partition door (11) capable of moving along the length direction of the heating chamber is arranged inside the heating chamber (3).
6. The heat treatment apparatus for a graphite heat exchanger as claimed in claim 4, wherein: the heating chamber (3) bottom is provided with track (12) that extends to the outside from inside to outside, is provided with railcar (13) on track (12), is equipped with drive arrangement on railcar (13).
7. The heat treatment apparatus for a graphite heat exchanger as claimed in claim 5, wherein: the door rail (14) is arranged on the bottom surface of the inner wall plate (2) at the top of the heating chamber (3), the movable partition door (11) is movably clamped with the door rail (14), and a driving device is arranged on the movable partition door (11).
8. The heat treatment apparatus for a graphite heat exchanger as claimed in claim 5, wherein: the wall body, the furnace door (9) and the movable partition door (11) which form the electric heating high-temperature treatment furnace (1) are of three-layer structures and comprise an inner layer, a heat-insulating layer and an outer layer; and a soft sealing strip is arranged at the edge of the movable partition door (11).
9. The heat treatment apparatus for a graphite heat exchanger as claimed in claim 5, wherein: and 1 fan (5) is arranged right above the center of each chamber partitioned by the partition plate (10).
10. The heat treatment apparatus for a graphite heat exchanger as claimed in claim 4, wherein: a fan corresponding hole (6) is formed in the inner wall plate (2) right below the paddle, and the opening diameter of the fan corresponding hole (6) is equal to the size of the paddle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111055004.6A CN113776326A (en) | 2021-09-09 | 2021-09-09 | Heat treatment method and device for graphite heat exchanger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111055004.6A CN113776326A (en) | 2021-09-09 | 2021-09-09 | Heat treatment method and device for graphite heat exchanger |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113776326A true CN113776326A (en) | 2021-12-10 |
Family
ID=78842089
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111055004.6A Withdrawn CN113776326A (en) | 2021-09-09 | 2021-09-09 | Heat treatment method and device for graphite heat exchanger |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113776326A (en) |
-
2021
- 2021-09-09 CN CN202111055004.6A patent/CN113776326A/en not_active Withdrawn
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Application publication date: 20211210 |