CN112414134A - Constant temperature cracking furnace - Google Patents
Constant temperature cracking furnace Download PDFInfo
- Publication number
- CN112414134A CN112414134A CN202011329586.8A CN202011329586A CN112414134A CN 112414134 A CN112414134 A CN 112414134A CN 202011329586 A CN202011329586 A CN 202011329586A CN 112414134 A CN112414134 A CN 112414134A
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- CN
- China
- Prior art keywords
- hearth
- furnace body
- temperature
- furnace
- oven according
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000005336 cracking Methods 0.000 title claims abstract description 12
- 239000010453 quartz Substances 0.000 claims abstract description 29
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 29
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims abstract description 15
- 229910010271 silicon carbide Inorganic materials 0.000 claims abstract description 15
- 238000007789 sealing Methods 0.000 claims abstract description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 7
- 239000010935 stainless steel Substances 0.000 claims description 7
- 239000010431 corundum Substances 0.000 claims description 4
- 229910052593 corundum Inorganic materials 0.000 claims description 4
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 claims description 3
- 239000011810 insulating material Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 3
- 229910052863 mullite Inorganic materials 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 abstract description 8
- 230000003111 delayed effect Effects 0.000 abstract description 2
- 230000006978 adaptation Effects 0.000 description 2
- 238000004821 distillation Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000012774 insulation material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 229920000742 Cotton Polymers 0.000 description 1
- 239000002775 capsule Substances 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
Images
Classifications
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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
- F27B17/00—Furnaces of a kind not covered by any preceding group
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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
- F27D21/00—Arrangements of monitoring devices; Arrangements of safety devices
- F27D21/0014—Devices for monitoring temperature
-
- 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
- F27D2019/0003—Monitoring the temperature or a characteristic of the charge and using it as a controlling value
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Muffle Furnaces And Rotary Kilns (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The invention discloses a constant temperature cracking furnace, which comprises a furnace body and a furnace door for sealing an opening of the furnace body; a hearth is arranged in the furnace body and is made of silicon carbide; rod-shaped heaters are arranged on the upper side and the lower side of the hearth; the quartz tube support device also comprises a base which is arranged in the hearth and used for supporting the quartz tube; the temperature measuring device extends into the hearth from the outer side of the furnace body. The principle of the invention is that the heat generated by the heating device is directly communicated to the interior of the hearth without being transmitted through the hearth, and the temperature measuring device also tests the temperature in the hearth, so that the temperature PID control is not delayed, thereby reducing the fluctuation of the temperature.
Description
Technical Field
The invention relates to a cracking furnace.
Background
The tubular cracking furnace is a furnace type commonly used in the cracking process at present, the existing cracking furnace is to invert a cylindrical distillation furnace, and a quartz tube is directly placed into a circular distillation furnace for heating. The furnace body adopts an external heater, and the heat of the heater firstly heats the silicon carbide hearth and secondly conducts the silicon carbide into the hearth to heat the product. The temperature of the silicon carbide external heater is measured by the temperature measuring component, the distance between the internal temperature of the silicon carbide furnace body and the heating component is large, a large hysteresis phenomenon occurs between the internal temperature of the silicon carbide furnace body and the heating component, the set temperature and the actual temperature are controlled to fluctuate by +/-30 ℃, and the constant temperature state (+/-5 ℃) is difficult to achieve. The quality of the product varies greatly due to the difference of temperature. In the operation process, the quartz tube is taken out of the furnace body when the vessel is filled with the raw materials, and then the quartz boat filled with the raw materials is placed in the quartz tube. When the finished product is taken out, the tubular vessel is taken out from the cracking furnace, and the quartz boat and the finished product can be taken out only after the temperature of the tubular vessel is reduced to room temperature.
Disclosure of Invention
In view of the above, the invention provides a constant temperature cracking furnace with small temperature fluctuation range.
In order to solve the technical problems, the technical scheme of the invention is to adopt a constant temperature cracking furnace, which comprises a furnace body and a furnace door for sealing an opening of the furnace body; a hearth is arranged in the furnace body and is made of silicon carbide; rod-shaped heaters are distributed on the upper side and the lower side of the hearth; the quartz tube support device also comprises a base which is arranged in the hearth and used for supporting the quartz tube; the temperature measuring device extends into the hearth from the outer side of the furnace body. The principle of the invention is that the heat generated by the heating device is directly communicated to the interior of the hearth without being transmitted through the hearth, and the temperature measuring device also tests the temperature in the hearth, so that the temperature PID control is not delayed, thereby reducing the fluctuation of the temperature.
As an improvement, the top of the base is in an arc shape consistent with the radian of the side wall of the quartz tube. The quartz tube is prevented from rolling, and simultaneously, the quartz tube is supported, so that all parts of the quartz tube can be uniformly heated.
As a further improvement, the base is made of corundum mullite. High strength and high temperature resistance.
As another further improvement, the bases are divided into a left group and a right group, and each group of bases is three bases arranged along the extension direction of the furnace body. Two quartz tubes can be horizontally placed, the yield is improved, and the energy consumption is reduced.
As an improvement, the heater is rod-shaped and is uniformly distributed on the upper part and the lower part of the hearth. The temperature in the hearth can be rapidly increased, and the temperature increase speed of each part is uniform.
As an improvement, the furnace body is a cuboid with an opening at one end, the outer wall of the furnace body is made of high-temperature-resistant stainless steel, and the inner side of the outer wall is coated with a heat-insulating material.
As an improvement, the outer wall of the hearth is tightly attached to the inner wall of the furnace body, and the opening of the hearth extends out of the opening of the furnace body.
As an improvement, the furnace door is spherical, and the inner side of the furnace door is made of temperature-resistant stainless steel and is coated with a heat-insulating material. The existing furnace door is sealed and insulated by insulation cotton, and the scattering and diffusion of insulation materials can be caused when a quartz tube is operated, so that the product quality is influenced.
As an improvement, the oven door is mechanically driven to open and close. The existing furnace door is manually opened by an operator, and safety accidents are easily caused under the condition of high temperature.
The invention has the advantages that: the constant-temperature cracking furnace with the structure utilizes the silicon carbide rod as a heating element to directly heat the temperature in the hearth, so that the temperature rise time is reduced by more than 30 minutes. And meanwhile, the two quartz tubes are heated, so that the yield is doubled under the same energy consumption. Because the temperature measuring device directly detects the temperature in the hearth, the PID temperature control has no lag, the amplitude of temperature oscillation is reduced, the temperature is controlled within +/-3 ℃, and the constant temperature in the true sense is realized. The base can prevent that the quartz capsule from rolling, avoids inside product quality deviation to appear.
Drawings
Fig. 1 is a schematic sectional structure of the present invention.
Fig. 2 is a cross-sectional structural view of the present invention.
The labels in the figure are: 1 furnace body, 2 heat preservation materials, 3 temperature measuring devices, 4 hearths, 5 rod-shaped heaters, 6 furnace doors, 7 quartz tubes and 8 bases.
Detailed Description
In order that those skilled in the art will better understand the technical solutions of the present invention, the present invention will be further described in detail with reference to the following embodiments.
As shown in fig. 1 and 2, the present invention comprises a furnace body 1, and a furnace door 6 for closing an opening of the furnace body 1; a hearth 4 is arranged in the furnace body 1, and the hearth 4 is made of silicon carbide; rod-shaped heaters 5 are distributed on the upper side and the lower side of the hearth 4; the rod-shaped heaters 5 are preferably silicon carbide rods and are uniformly distributed on the upper and lower sides of the hearth 4.
The furnace also comprises a base 8 which is arranged inside the hearth 4 and used for supporting the quartz tube 7; the top of the base 8 is arc-shaped and consistent with the radian of the side wall of the quartz tube 7. The bases 8 are arranged in a left group and a right group, and each group of bases is three and is arranged along the extension direction of the furnace body 1 and respectively supported at the front, middle and rear parts of the quartz tube 7. The base 8 is made of corundum mullite.
The temperature measuring device 3 extends into the hearth 4 from the outer side of the furnace body 1. The temperature measuring device 4 adopts a temperature measuring couple, and the temperature measuring couple is arranged in the hearth 4 in order to ensure that the measured temperature has no deviation.
The furnace body 1 is a cuboid with an opening at one end, the outer wall of the furnace body is made of high-temperature resistant stainless steel, and the inner side of the outer wall is coated with a heat insulation material 2. The outer wall of the hearth 4 is clung to the inner wall of the furnace body 1, and the opening of the hearth extends out of the opening of the furnace body 1. The furnace door 6 is spherical and made of temperature-resistant stainless steel. The door 6 is mechanically driven to open and close, for example, by an oil cylinder or an air cylinder, or by a motor, as long as the door 6 can be driven to open and close.
The invention has the following characteristics:
(1) redesigning the hearth, adopting the silicon carbide hearth 4 for ensuring the cleanliness of the hearth, and uniformly distributing strip-shaped heating elements 5 on the upper side and the lower side of the silicon carbide hearth 4 so as to be convenient for the heat of the heater to be quickly transferred to the tubular quartz tube 7.
(2) The corundum Molai stone base 8 is used for uniformly and partially supporting the quartz tube 7 in the silicon carbide hearth 4, so that all directions of the quartz tube 7 can be uniformly heated.
(3) The built-in temperature measuring element is placed in the silicon carbide hearth 4, the temperature of the built-in heating element can be rapidly measured, the controller can adjust the temperature in an emergency, and the temperature can be controlled to +/-3 ℃.
(4) The furnace body 1 is internally provided with two quartz tubes 7 which are arranged side by side at the left and the right.
(5) The exterior of the furnace body 1 is made of high temperature resistant stainless steel, and the furnace door 7 is made into a spherical surface according to the size of a quartz tube.
(6) The furnace door 7 adopts a mechanical drive opening mode.
The above is only a preferred embodiment of the present invention, and it should be noted that the above preferred embodiment should not be considered as limiting the present invention, and the protection scope of the present invention should be subject to the scope defined by the claims. It will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the spirit and scope of the invention, and these modifications and adaptations should be considered within the scope of the invention.
Claims (9)
1. A constant temperature cracking furnace comprises a furnace body and a furnace door for sealing an opening of the furnace body; the method is characterized in that: a hearth is arranged in the furnace body and is made of silicon carbide; rod-shaped heaters are arranged on the upper side and the lower side of the hearth; the quartz tube support device also comprises a base which is arranged in the hearth and used for supporting the quartz tube; the temperature measuring device extends into the hearth from the outer side of the furnace body.
2. The oven according to claim 1, characterized in that: the top of the base is arc-shaped and consistent with the radian of the side wall of the quartz tube.
3. The oven according to claim 1, characterized in that: the base is made of corundum mullite.
4. The oven according to claim 1, characterized in that: the base is two sets of about, and every group base is for following the furnace body extending direction setting three.
5. The oven according to claim 1, characterized in that: the heaters on the upper side and the lower side are uniformly distributed.
6. The oven according to claim 1, characterized in that: the furnace body is a cuboid with an opening at one end, the outer wall of the furnace body is made of high-temperature-resistant stainless steel, and the inner side of the outer wall is coated with a heat-insulating material.
7. The oven according to claim 1, characterized in that: the outer wall of the hearth is tightly attached to the inner wall of the furnace body, and the opening of the hearth extends out of the opening of the furnace body.
8. The oven according to claim 1, characterized in that: the furnace door is spherical and made of temperature-resistant stainless steel.
9. The oven according to claim 1, characterized in that: the oven door is mechanically driven to open and close.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011329586.8A CN112414134A (en) | 2020-11-24 | 2020-11-24 | Constant temperature cracking furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011329586.8A CN112414134A (en) | 2020-11-24 | 2020-11-24 | Constant temperature cracking furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112414134A true CN112414134A (en) | 2021-02-26 |
Family
ID=74778769
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011329586.8A Pending CN112414134A (en) | 2020-11-24 | 2020-11-24 | Constant temperature cracking furnace |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112414134A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2442997Y (en) * | 2000-03-31 | 2001-08-15 | 中国石油化工集团公司 | Electric heating cracking furnace |
| CN203700282U (en) * | 2013-12-30 | 2014-07-09 | 泰州市中环分析仪器有限公司 | Heat-insulation type cracking furnace |
| CN104233472A (en) * | 2014-09-12 | 2014-12-24 | 吉林华微电子股份有限公司 | Method for arranging long silicon carbide support in diffusion furnace to prevent quartz tube from being deformed |
| CN104371754A (en) * | 2014-11-01 | 2015-02-25 | 韩清 | Ethylene cracking furnace |
| CN105444573A (en) * | 2015-12-01 | 2016-03-30 | 聂晓彬 | Energy-saving and environment-friendly high-temperature electric melting furnace |
| CN210242400U (en) * | 2019-05-31 | 2020-04-03 | 浙江智造热成型科技有限公司 | Constant temperature heating furnace |
-
2020
- 2020-11-24 CN CN202011329586.8A patent/CN112414134A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2442997Y (en) * | 2000-03-31 | 2001-08-15 | 中国石油化工集团公司 | Electric heating cracking furnace |
| CN203700282U (en) * | 2013-12-30 | 2014-07-09 | 泰州市中环分析仪器有限公司 | Heat-insulation type cracking furnace |
| CN104233472A (en) * | 2014-09-12 | 2014-12-24 | 吉林华微电子股份有限公司 | Method for arranging long silicon carbide support in diffusion furnace to prevent quartz tube from being deformed |
| CN104371754A (en) * | 2014-11-01 | 2015-02-25 | 韩清 | Ethylene cracking furnace |
| CN105444573A (en) * | 2015-12-01 | 2016-03-30 | 聂晓彬 | Energy-saving and environment-friendly high-temperature electric melting furnace |
| CN210242400U (en) * | 2019-05-31 | 2020-04-03 | 浙江智造热成型科技有限公司 | Constant temperature heating furnace |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210226 |