CN213159445U - Sulfur hexafluoride and hexafluoroethane rectification control system - Google Patents
Sulfur hexafluoride and hexafluoroethane rectification control system Download PDFInfo
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- CN213159445U CN213159445U CN202020263645.5U CN202020263645U CN213159445U CN 213159445 U CN213159445 U CN 213159445U CN 202020263645 U CN202020263645 U CN 202020263645U CN 213159445 U CN213159445 U CN 213159445U
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Abstract
The utility model discloses a sulfur hexafluoride and hexafluoroethane rectification control system, including the rectifying column, rectifying column one side is equipped with the feed inlet, and the rectifying column top is connected with the condenser, and the rectifying column bottom is connected with the reboiler, and the inside liquid level that is equipped with of rectifying column, condenser are connected with the condensate storage tank, and condensate storage tank below is connected with product collection device one, and the reboiler below is connected with product collection device two. The utility model has the advantages that: during single-phase feeding, feeding temperature control can be adopted, and during two-phase feeding, constant enthalpy is controlled to overcome interference; the cooling capacity of the condenser and the heating capacity of the reboiler are stabilized by a constant value control system; the feeding flow is constant and is controlled by a fixed value; preheating the feeding material, and carrying out constant value control on the feeding temperature; the vapor pressure variation can be controlled by manifold pressure.
Description
Technical Field
The utility model relates to a chemical production field particularly, relates to a sulfur hexafluoride and hexafluoroethane rectification control system.
Background
The sulfur hexafluoride is mainly used as an electrical insulating medium and an arc extinguishing agent, and can be miniaturized as much as possible while ensuring the safe and reliable operation of the power equipment, thereby reducing the equipment cost. Most of the high-power transformers at present use sulfur hexafluoride for insulation, so that the damage of spark discharge and electric arc to equipment is greatly reduced, the current interrupter with the sulfur hexafluoride has the characteristics of high rated voltage, high easiness, difficult combustion and the like, and in addition, the sulfur hexafluoride is also used for various accelerators, ultrahigh voltage accumulators, coaxial cables and insulating media for microwave transmission.
Sulfur hexafluoride is a tracer which is widely applied to measuring atmospheric pollution at present, and the missing distance can reach 100 kilometers. Meanwhile, the sulfur hexafluoride is used as the refrigerant to replace Freon, has no damage effect on the ozone layer, meets the requirements of environmental protection and use performance, and is a refrigerant with great development potential.
The sulfur hexafluoride can be used for smelting and casting process of nonferrous metals, preventing the oxidation of magnesium and its alloy melt, and can also be used for degassing and purifying aluminium and its alloy melt. In the microelectronics industry, sulfur hexafluoride can be used to etch silicon surfaces and remove organic or inorganic films from semiconductor materials and can be used as a single film fiber spacer dopant in the fabrication of photocleaved fibers.
The distillation operation of the sulfur hexafluoride has a plurality of controlled variables, a plurality of selectable manipulated variables and various combinations, so that the distillation tower has a plurality of control schemes. Meanwhile, the process and the structural characteristics of each rectifying tower are different, so that no perfect and reasonable control scheme exists at present.
An effective solution to the problems in the related art has not been proposed yet.
SUMMERY OF THE UTILITY MODEL
To the above-mentioned technical problem among the correlation technique, the utility model provides a sulfur hexafluoride and hexafluoroethane rectification control system can influence the internal balance of tower through the material balance who influences the whole tower to play the control action. The energy balance relation of the tower is changed, and the vapor-liquid ratio in the tower is changed, so that the product quality is controlled.
In order to achieve the technical purpose, the technical scheme of the utility model is realized as follows:
the utility model provides a sulfur hexafluoride and hexafluoroethane rectification control system, includes the rectifying column, rectifying column one side is equipped with the feed inlet, the rectifying column top is connected with the condenser, the rectifying column bottom is connected with the reboiler, the inside liquid level that is equipped with of rectifying column, the condenser is connected with the condensate storage tank, condensate storage tank below is connected with product collection device one, the reboiler below is connected with product collection device two.
Further, a condensing agent is added into the condenser.
Furthermore, the sulfur hexafluoride and hexafluoroethane rectification control system is single-loop control or cascade control.
Preferably, the single-loop control is sequentially connected with a controller, a control valve and an object output from left to right, a single-loop constant value is arranged on the right side of the controller, and a measuring element transmitter is arranged between the single-loop constant value and the object output.
Preferably, the cascade control comprises a main controller, an auxiliary controller, an actuator, an auxiliary object output and a main object output from left to right in sequence, a first cascade constant value and a second cascade constant value are respectively arranged on the left side and the right side of the main controller, a main measuring element transmitter is arranged between the first cascade constant value and the auxiliary object output, and an auxiliary measuring element transmitter is arranged between the second cascade constant value and the main object output.
The utility model has the advantages that:
during single-phase feeding, feeding temperature control can be adopted, and during two-phase feeding, constant enthalpy is controlled to overcome interference; the cooling capacity of the condenser and the heating capacity of the reboiler are stabilized by a constant value control system; the feeding flow is constant and is controlled by a fixed value; preheating the feeding material, and carrying out constant value control on the feeding temperature; the vapor pressure variation can be controlled by manifold pressure.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a sulfur hexafluoride and hexafluoroethane rectification control system according to an embodiment of the present invention;
fig. 2 is a block flow diagram of a single loop control according to an embodiment of the present invention;
fig. 3 is a block diagram of a flow of cascade control according to an embodiment of the present invention.
In the figure:
1. a rectifying tower; 1-1, a feed inlet; 2. a first product collecting device; 2-1, a condenser; 2-2, a condensate storage tank; 3. a second product collecting device; 3-1, a reboiler; 4. a controller; 4-1, a control valve; 4-2, outputting the object; 4-3, single loop constant value; 4-4, measuring element transmitter; 5. a main controller; 5-1, a sub-controller; 5-2, an actuator; 5-3, outputting the secondary object; 5-4, outputting the main object; 5-5, a cascade fixed value of one; 5-6, cascade fixed value two; 5-7, a main measuring element transmitter; 5-8, a secondary measuring element transmitter.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art all belong to the protection scope of the present invention.
As shown in fig. 1-3, according to the embodiment of the utility model provides a sulfur hexafluoride and hexafluoroethane rectification control system, including rectifying column 1, rectifying column 1 one side is equipped with feed inlet 1-1, rectifying column 1 top is connected with condenser 2-1, rectifying column 1 bottom is connected with reboiler 3-1, the inside liquid level that is equipped with of rectifying column 1, condenser 2-1 is connected with condensate storage tank 2-2, condensate storage tank 2-2 below is connected with product collection device one 2, reboiler 3-1 below is connected with product collection device two 3.
In a specific embodiment of the present invention, a condensing agent is added to the condenser 2-1.
In one embodiment of the present invention, the rectification control system for sulfur hexafluoride and hexafluoroethane is single-loop control or cascade control.
In a specific embodiment of the present invention, the single-loop control is sequentially connected with a controller 4, a control valve 4-1 and an object output 4-2 from left to right, the right side of the controller 4 is provided with a single-loop constant value 4-3, and a measuring element transmitter 4-4 is arranged between the single-loop constant value 4-3 and the object output 4-2.
In a specific embodiment of the utility model, the cascade control is from a left side to the right side main control unit 5, sub-control unit 5-1, executor 5-2, sub-object output 5-3 and main object output 5-4 in proper order, the main control unit 5 left and right sides is equipped with cascade definite value one 5-5 and cascade definite value two 5-6 respectively, cascade definite value one 5-5 with be equipped with main measuring element changer 5-7 between sub-object output 5-3, cascade definite value two 5-6 with be equipped with sub-measuring element changer 5-8 between main object output 5-4.
For the convenience of understanding the above technical solutions of the present invention, the above technical solutions of the present invention are explained in detail through specific use modes below.
According to sulfur hexafluoride and hexafluoroethane rectification control system, wherein the main factor that influences the rectification process can be summarized as follows: 1. feeding amount; 2. the feed concentration; 3. feed temperature and feed conditions; 4. the heating amount of the reboiler 5 and the cooling amount of the cooler; 6. the amount of reflux; 7. the extraction amount at the top of the tower; 8. the extraction amount at the bottom of the tower; 9. the effect of column pressure.
a) The feed rate is in many cases uncontrollable and its variation is often difficult to avoid completely. If the rectifying tower is located at the beginning of the whole process, the flow F is constant without difficulty, and can be controlled by a fixed value.
b) The feed composition is generally not controllable, and its variation is inevitable, which is determined by the previous process or material conditions.
c) The concentrate temperature (or enthalpy) is generally not controllable. The feed temperature is inherently constant in some cases, such as when the bottoms from the previous column are sent to the next column for further rectification. In other cases, the feed may be preheated and the feed temperature may be controlled to a fixed value. The feed is usually in liquid or gaseous form, and sometimes a mixture of gas and liquid is encountered, where the ratio of gas to liquid phases is preferably constant, i.e. the enthalpy of the feed is constant.
d) The vapor pressure fluctuations can be eliminated by header pressure control or can be overcome in a secondary loop of a cascade control system (e.g., a cascade control system that employs flow of vapor).
e) Pressure fluctuations in the cooling water can also be solved in a similar manner.
f) The change of the cooling water temperature is usually gentle and mainly influenced by seasons.
g) Changes in ambient temperature are generally of minor effect, but there are special cases as well. The condenser directly cooled by the atmosphere is frequently used, and has a great influence on the temperature of reflux liquid when the climate changes, particularly storms, and internal reflux control can be adopted for the purpose.
Some of the various disturbances described above are controllable and some are not. The feed rate is generally not controllable (influenced by the previous process). The feed concentration is not controllable, it is determined by the previous process, but generally varies slowly. Variations in feed temperature and feed conditions have a greater impact on column operation. To maintain energy balance and stable operation of the column operation, feed temperature control can be employed to overcome this interference in single phase feeds. In the case of a two-phase feed, one can then try to control the enthalpy constant to overcome the disturbance. The cooling capacity of the condenser and the heating capacity of the reboiler are stabilized by a constant value control system.
The analysis of the static characteristics and internal equilibrium relationship of the column, means of controlling the following parameters were employed: the extraction amount at the top of the tower, the extraction amount at the bottom of the tower, the reflux amount, the heating amount of a reboiler and the cooling amount of a condenser.
The former two are used to influence the internal balance of the tower by influencing the material balance of the whole tower, thereby playing a control role. The latter three quantities directly change the energy balance relationship of the tower and change the vapor-liquid ratio in the tower, thereby playing the role of controlling the product quality.
When the device is used, when raw materials flow into the tower through the feeding pipe from the feeding hole, the rectification operation is started, and the proper liquid level of the material liquid in the kettle is established, the reboiler heats the material liquid to ensure that part of the liquid is gasified and returns to the tower. The gaseous phase rises along the column to the top of the column and is condensed, wholly or partially, by the overhead condenser. The overhead vapor condensate portion is withdrawn as overhead product, referred to as distillate. The other part of the condensate is returned to the top of the tower as reflux. The reflux liquid flows down from the top of the tower along the wall of the tower and is reversely contacted and separated with ascending steam from the top of the tower for a plurality of times in the descending process. When the liquid flows to the bottom of the tower, the liquid is partially gasified by a reboiler, the gas phase returns to the tower to be used as gas phase reflux, and the liquid phase is extracted as a bottom product.
In summary, with the above technical solution of the present invention, there are many controlled variables in the rectification operation, many manipulated variables can be selected, and there are various combinations, so that there are many control schemes for the rectification column. The process and the structural characteristics of each rectifying tower are relatively perfect and reasonable control scheme.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (2)
1. A rectification control system for sulfur hexafluoride and hexafluoroethane comprises a rectification tower (1), and is characterized in that a feeding hole (1-1) is formed in one side of the rectification tower (1), a condenser (2-1) is connected to the top of the rectification tower (1), a reboiler (3-1) is connected to the bottom of the rectification tower (1), a liquid level is arranged inside the rectification tower (1), a condensate storage tank (2-2) is connected to the condenser (2-1), a first product collecting device (2) is connected to the lower portion of the condensate storage tank (2-2), a second product collecting device (3) is connected to the lower portion of the reboiler (3-1), and the sulfur hexafluoride and hexafluoroethane rectification control system adopts single-loop control or cascade control; the single-loop control is sequentially connected with a controller (4), a control valve (4-1) and an object output (4-2) from left to right, a single-loop constant value (4-3) is arranged on the right side of the controller (4), and a measuring element transmitter (4-4) is arranged between the single-loop constant value (4-3) and the object output (4-2); the cascade control is sequentially performed by a main controller (5), an auxiliary controller (5-1), an actuator (5-2), an auxiliary object output (5-3) and a main object output (5-4) from left to right, a first cascade constant value (5-5) and a second cascade constant value (5-6) are respectively arranged on the left side and the right side of the main controller (5), a main measuring element transmitter (5-7) is arranged between the first cascade constant value (5-5) and the auxiliary object output (5-3), and an auxiliary measuring element transmitter (5-8) is arranged between the second cascade constant value (5-6) and the main object output (5-4).
2. The sulfur hexafluoride and hexafluoroethane rectification control system of claim 1 wherein a condensing agent is added to the condenser (2-1).
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| CN202020263645.5U CN213159445U (en) | 2020-03-06 | 2020-03-06 | Sulfur hexafluoride and hexafluoroethane rectification control system |
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| CN202020263645.5U CN213159445U (en) | 2020-03-06 | 2020-03-06 | Sulfur hexafluoride and hexafluoroethane rectification control system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116983701A (en) * | 2023-08-30 | 2023-11-03 | 福建德尔科技股份有限公司 | Rectification control system for preparing trifluoromethane and control method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116983701A (en) * | 2023-08-30 | 2023-11-03 | 福建德尔科技股份有限公司 | Rectification control system for preparing trifluoromethane and control method thereof |
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Address after: No. 6, Gongye Road, Jiaoyang industrial concentration zone, Jiaoyang Town, Shanghang County, Longyan City, Fujian Province, 364204 Patentee after: Fujian del Technology Co.,Ltd. Address before: No. 6, Gongye Road, Jiaoyang industrial concentration zone, Jiaoyang Town, Shanghang County, Longyan City, Fujian Province, 364204 Patentee before: FUJIAN DEER TECHNOLOGY CO.,LTD. |