CN107998682B - Cluster electric heating type low-temperature reboiler - Google Patents
Cluster electric heating type low-temperature reboiler Download PDFInfo
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- CN107998682B CN107998682B CN201711237279.5A CN201711237279A CN107998682B CN 107998682 B CN107998682 B CN 107998682B CN 201711237279 A CN201711237279 A CN 201711237279A CN 107998682 B CN107998682 B CN 107998682B
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- reboiler
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- electric heater
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/14—Fractional distillation or use of a fractionation or rectification column
- B01D3/32—Other features of fractionating columns ; Constructional details of fractionating columns not provided for in groups B01D3/16 - B01D3/30
- B01D3/322—Reboiler specifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/14—Fractional distillation or use of a fractionation or rectification column
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- Chemical Kinetics & Catalysis (AREA)
- Separation By Low-Temperature Treatments (AREA)
- Physical Or Chemical Processes And Apparatus (AREA)
Abstract
The invention relates to a cluster electric heating type low-temperature reboiler which comprises a tower kettle liquid storage container, an electric heater element and a corresponding control system, wherein the tower kettle liquid storage container is formed by connecting n cylinders with the same size in parallel, and n is more than or equal to 1; the electric heater element is coated on the outer wall of the cylinder and is used for heating and vaporizing the low-temperature liquid in the cylinder; the control system is used for accurately controlling the heating load of the electric heater. Compared with the prior art, the invention realizes the vaporization of the internal liquid by heating the outer wall surface of the tower kettle, so that the heating operation for flammable and explosive or corrosive media is safer and more reliable, and the low liquid holding of the tower kettle can be realized, even the operation is close to a dry kettle; on the other hand, the invention realizes the specific temperature field distribution of the axial space by controlling the heating quantity of different areas on the axial space, thereby meeting the more accurate heating control requirement and overcoming the defect that the heating quantity can not be adjusted by areas by the traditional uniform heating.
Description
Technical Field
The invention relates to low-temperature liquid heating equipment, in particular to a reboiler device of a low-temperature rectifying tower, which can be widely applied to the industries of isotope separation, essence and spice, isomeride and the like.
Background
Rectification is the most widely used separation operation method for mixtures in industry, and is widely applied to various fields such as petroleum, chemical industry, light industry, food, metallurgy and the like. During the rectification operation, the interaction of gas phase and liquid phase is continuously carried out in the rectification tower, so that heavy components are concentrated in the tower kettle, and light components are concentrated in the tower top; the gas-phase fluid in the tower is generally formed by heating and vaporizing tower bottoms, so that the reboiler device is one of key parts for realizing normal production and operation of the rectifying tower. Among many distillation operation categories, the cryogenic distillation, also called cryogenic separation method, invented by professor linder in 1902 is widely applied to separation and purification of gas mixtures, such as air separation, isotope gas separation, and the like.
In the conventional electrically heated reboiler apparatus of a rectification column, at most, an immersed electric heater is used, i.e., an electric heater element is immersed in a heated medium. The heating mode of the reboiler has the advantages of high energy efficiency, easy control and the like, and the heat emitted by the reboiler is almost completely absorbed by tower bottoms, so that the reboiler is widely applied to the fields of petroleum, chemical industry and the like. However, in the actual operation process, the heating method requires that the tower bottom liquid needs to maintain a certain liquid level height to ensure that the liquid submerges the heating pipe, if the liquid level is too low, the electric heater element is exposed out of the liquid, so that the heating pipe is empty, the exposed electric heater element is damaged due to too high surface temperature, and even safety accidents are caused. Therefore, if the operation of the electric heater element is to be ensured safely, the amount of liquid remaining in the kettle is too large to be evaporated completely. In some special rectification operations, such as cryogenic rectification, batch rectification, etc., if the product belongs to a high boiling point component, the product is extracted from the tower kettle, the traditional immersed tower kettle reboiler causes slower updating of the kettle liquid due to more kettle liquid residue, and especially for isotope separation with the equilibrium time of more than half a year, the operation equilibrium time and the product yield are directly influenced, and even the product is possibly unqualified. Moreover, especially low-temperature liquid is heated and is very easily vaporized, and the heat of traditional immersed heating pipe is almost all absorbed by tower cauldron liquid for form evenly distributed's temperature field on the axial space of tower cauldron liquid storage container, difficult formation accurate subregion heating control, therefore also provided very big challenge to the isotope separator that stable operation required height.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a cluster electric heating type low-temperature reboiler device, which solves the defects that the traditional reboiler device has a large amount of residual kettle liquid and cannot accurately regulate and control the temperature field distribution.
The purpose of the invention can be realized by the following technical scheme: a cluster electric heating type low-temperature reboiler comprises a tower kettle liquid storage container, an electric heater element and a corresponding control system, and is characterized in that the tower kettle liquid storage container is formed by connecting n cylinders with the same size in parallel, wherein n is more than or equal to 1; the electric heater element is coated on the outer wall of the cylinder and is used for heating and vaporizing the low-temperature liquid in the cylinder; the control system is used for accurately controlling the heating load of the electric heater.
The outer wall of each cylinder is coated with at least 2 electric heater elements with the same specification.
The control system is connected with and controls all the electric heater elements coated on the outer wall of the cylinder, the control system is adjusted and controlled through a PLC or a DCS, and the control precision reaches +/-0.1W.
One of the cylinders connected in parallel is vertically connected with the low-temperature rectifying tower, and the rest cylinders are uniformly distributed around the low-temperature rectifying tower.
The cylinders connected in parallel are respectively connected with the rectifying tower body through pipelines, the intersecting positions are connected through arc bent pipes, and the included angle r between the upper connecting pipeline and the horizontal direction is 10-30 degrees.
The electric heater element is a metal flexible electric heating film, the upper and lower surfaces of the electric heater element are films with good temperature resistance and excellent insulating property, the middle part of the electric heater element is a resistive circuit made of metal alloy foil based on high-ductility copper foil, a planar heating mode is adopted, and the allowable surface power load can be close to 8.0W/cm2The device has the remarkable characteristics of uniform thermal field, short heating time and quick response time; the minimum thickness of the electric heating film can be close to 0.2mm, the electric heating film can be bent randomly according to the shape of a workpiece, and the minimum bending radius of the electric heating film is 0.5-0.7mm, so that the electric heating film is ensured to be in close contact with the heated workpiece, and the efficient heat utilization rate is ensured.
The reboiler adopts an external wall surface heating and vaporizing mode, and is suitable for CO and H2、O2、CH4、BF3And the like, for vaporization of flammable and explosive or corrosive cryogenic liquids.
The reboiler is arranged in the vacuum jacket or in the cold box.
The reboiler is suitable for isotope separation, separation systems of flavors, fragrances or isomers.
Compared with the traditional immersed reboiler device, the invention has the following outstanding advantages:
(1) the tower kettle reboiler adopts the form of heating of the outer wall surface of the cylinder, so that the tower kettle reboiler is safer and more reliable for heating flammable and explosive or corrosive liquid, and meanwhile, the service life of the electric heater element can be greatly prolonged.
(2) The reboiler of the tower kettle can completely realize the operation of the tower kettle with low liquid holdup even under the working condition of dry kettle for a long time, and the reboiler of the tower kettle has the characteristic that the operation of the traditional immersed electric heater cannot be realized, so the reboiler of the tower kettle has more flexible and wider operation flexibility.
(3) For the electric heater elements on the outer wall surface of the cylinder, the heating load of each electric heating element can be adjusted through the control system, so that specific temperature field distribution is realized in the axial space of the reboiler, and the aim of more accurate regulation and control is fulfilled.
Drawings
Fig. 1 is a schematic structural diagram of a reboiler of a tower kettle of a conventional submerged rectifying tower.
FIG. 2 is a schematic structural diagram of a bundled electric heating type low-temperature reboiler in the present invention.
FIG. 3 is a top view of a tower reservoir consisting of 5 cylinders.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
Example 1
Cluster electric heating type low-temperature reboiler device for preparing stable isotope by CO low-temperature rectification13And C, as shown in figure 1, the device is formed by combining a tower kettle liquid storage container, an electric heater element and a corresponding control system. In the embodiment, the liquid storage containers are formed by connecting 3 cylinders 1 with the same size in parallel, except for a cylinder 11 vertically connected with the rectifying tower body, the other 2 cylinders 12 are uniformly distributed at two sides of the rectifying tower 3 and connected with the rectifying tower body 3 through a pipeline 4, the intersection parts are connected by adopting circular arc bent pipes, and the included angle r between the upper connecting pipeline 4 and the horizontal direction is 20 degrees. The outer wall of each cylinder is coated with 3 electric heating elements 2 for cooling CO in the cylinderThe body is heated and vaporized, the electric heater elements are accurately controlled by a control system, and the adjusting precision can reach +/-0.1W. In the actual operation process, the liquid level of the tower kettle of the CO low-temperature rectifying tower is not higher than 0.01m, so that the long-time operation requirement is met.
Example 2
Cluster electric heating type low-temperature reboiler device for preparing stable isotope by liquid oxygen low-temperature rectification18And O, the device is formed by combining a tower kettle liquid storage container, an electric heater element and a corresponding control system. In this embodiment, the liquid storage containers are composed of 5 cylinders with the same size in parallel, as shown in fig. 3, except for a cylinder 11 vertically connected with the rectifying tower body 3, the other 4 cylinders 12 are uniformly distributed at two sides of the rectifying tower and connected with the rectifying tower body through pipelines, the intersection positions are connected by circular arc bent pipes, and the included angle r between the upper connecting pipeline and the horizontal direction is 25 °. Every cylinder outer wall all wraps has 4 electric heating element, heats the vaporization to the liquid oxygen in the cylinder, goes up electric heater element and carries out accurate control by control system, and the regulation precision can reach 0.1W. In the actual operation process, the liquid level of the tower kettle of the liquid oxygen low-temperature rectifying tower is not higher than 0.005m, and the long-time operation is successfully realized.
Claims (9)
1. A cluster electric heating type low-temperature reboiler comprises a tower kettle liquid storage container, an electric heater element and a corresponding control system, and is characterized in that the tower kettle liquid storage container is formed by connecting n cylinders with the same size in parallel, wherein n is more than 1; the electric heater element is coated on the outer wall of the cylinder and is used for heating and vaporizing the low-temperature liquid in the cylinder; the control system is used for accurately controlling the heating load of the electric heater.
2. The bundled electric heating type low-temperature reboiler as claimed in claim 1, wherein each cylinder is coated with not less than 2 electric heater elements of the same specification on its outer wall.
3. The bundled electric heating type low-temperature reboiler as claimed in claim 1, wherein the control system is connected with and controls all electric heater elements coated on the outer wall of the cylinder, and the control system is adjusted and controlled by PLC or DCS, and the control precision reaches +/-0.1W.
4. The bundled electric heating type low-temperature reboiler as claimed in claim 1, wherein one of the plurality of parallel cylinders is vertically connected to the low-temperature rectification column, and the rest of the plurality of parallel cylinders are uniformly distributed around the low-temperature rectification column.
5. The cluster electric heating type low-temperature reboiler of claim 1 or 4, characterized in that a plurality of parallel connected cylinders are respectively connected with the rectifying tower body through pipelines, the intersections are all connected by arc elbows, and the included angle r between the upper connecting pipeline and the horizontal direction is 10-30 °.
6. The reboiler of claim 1 wherein the electric heater element is a metal flexible electric heating film, and the upper and lower surfaces of the film are a high temperature resistant and high insulation film having a minimum bending radius of 0.5-0.7 mm.
7. The bundled electric heating type low-temperature reboiler as claimed in claim 1, characterized in that the reboiler adopts an external wall surface heating vaporization mode, and is suitable for vaporization operation of flammable and explosive or corrosive low-temperature liquid.
8. The bundled electric heating type low-temperature reboiler as claimed in claim 1, wherein the reboiler is placed in a vacuum jacket or in a cold box.
9. The bundled electric heating type low-temperature reboiler as claimed in claim 1, characterized in that the reboiler is adapted for isotope separation, flavor and fragrance, or a separation system of isomers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711237279.5A CN107998682B (en) | 2017-11-30 | 2017-11-30 | Cluster electric heating type low-temperature reboiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711237279.5A CN107998682B (en) | 2017-11-30 | 2017-11-30 | Cluster electric heating type low-temperature reboiler |
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| Publication Number | Publication Date |
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| CN107998682A CN107998682A (en) | 2018-05-08 |
| CN107998682B true CN107998682B (en) | 2020-04-28 |
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Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000271403A (en) * | 1999-03-24 | 2000-10-03 | Tokyo Gas Co Ltd | Reboiler |
| DE202006003430U1 (en) * | 2006-03-02 | 2007-07-05 | Clyvia Technology Gmbh | Depolymerisation device for polymerizing raw materials containing hydrocarbons, such as residues, comprises agitator, reactor including a reactor cover, distillation column that is separable/exchangeable against new- or outdated reactor |
| CN204352567U (en) * | 2014-11-20 | 2015-05-27 | 安徽中昊石化设备制造有限公司 | A kind of reboiler with warning function |
| CN105396309A (en) * | 2015-12-03 | 2016-03-16 | 南京钟腾化工有限公司 | Novel reboiler |
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