CN216170029U - Multi-effect rectification system - Google Patents
Multi-effect rectification system Download PDFInfo
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- CN216170029U CN216170029U CN202121983631.1U CN202121983631U CN216170029U CN 216170029 U CN216170029 U CN 216170029U CN 202121983631 U CN202121983631 U CN 202121983631U CN 216170029 U CN216170029 U CN 216170029U
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Abstract
The utility model discloses a multi-effect rectification system, and belongs to the technical field of rectification in polycrystalline silicon production. The device comprises at least two rectifying units, wherein each rectifying unit comprises a rectifying tower, a reboiler, a condenser and a reflux tank, the middle part of each rectifying tower is connected with a feeding pipe I, the lower part of each rectifying tower is connected with the reboiler, and the lower part of each rectifying tower is also provided with a discharging hole; the top of the rectifying tower is connected with a reboiler in the next rectifying unit, and the reboiler in the next rectifying unit is connected with a condenser; a shell-side high-point exhaust port on the reboiler in the next rectification unit is connected with the condenser and the reflux tank through a gas phase balance pipe, and at the moment, the gas phase temperature transmitted to the condenser and the reflux tank is subjected to heat exchange through the reboiler, so that the temperature is reduced, and the energy is saved; and the noncondensable gas phase at the high point of the shell pass on the reboiler in the next rectification unit can be discharged in time, so that the heat transfer of the reboiler is facilitated, the rectification efficiency and quality are improved, the consumption of the rectification heat source is saved, and the like.
Description
Technical Field
The utility model relates to a multi-effect rectification system, and belongs to the technical field of rectification in polycrystalline silicon production.
Background
In the production of polysilicon, rectification is an indispensable separation and purification process based on a rectification tower, and is a separation process for separating components by utilizing different volatility of the components in a mixture. In a typical chemical plant, the energy consumption of rectification accounts for more than 60% of the total energy consumption of the whole plant, and is even higher, so that the development of novel rectification technologies such as multi-effect rectification, heat pump rectification and the like is necessary, and the heat source consumption of rectification is greatly saved.
The multi-effect rectification uses the gas phase material of the previous rectifying tower as the heat source of the next rectifying tower, adopts the operation flow of connecting a plurality of rectifying towers with sequentially reduced pressure in series, and uses the vapor at the top of the previous rectifying tower as the heating medium of the reboiler of the next rectifying tower, so that the heating medium and the cooling medium are not required to be introduced from the outside by the middle rectifying device except the rectifying towers at two ends. The theoretical energy saving rate of the double-effect rectification is about 50 percent, the energy saving rate of the triple-effect rectification is about 66.7 percent, the energy saving rate of the quadruple-effect rectification is about 75 percent, and the energy consumption of a chemical plant can be greatly saved.
In the multi-effect rectification, each rectification unit consists of an independent rectification tower, a reboiler, a tower top condenser, a reflux tank, a tower top reflux pump and a pipeline connected with the reflux tank. In order to balance the pressure of the tower top reflux tank and ensure that the liquid phase material of the tower top condenser can smoothly flow into the reflux tank, the inlet pipes of the tower top cooler, the reflux tank and the reboiler of the rear tower are connected with mutually communicated balance pipes, and the reboiler of the rear tower is used as a pressure output end to output a gas phase to the reflux tank and the reflux pipe, so that the pressures of the reboiler, the reflux tank and the condenser are nearly the same.
At present, a pipe connecting port at a reboiler is arranged on a gas phase pipe entering a shell side of the reboiler, and the following technical problems exist:
firstly, gas phase at an inlet pipe of a reboiler can continuously go to a condenser and a reflux tank, so that energy is wasted;
secondly, the high point of reboiler shell side has the non-condensable gas gathering of low boiling, leads to non-condensable gas effectively to be discharged completely, has reduced the heat transfer area of heat exchanger, has reduced the heat transfer effect etc. of heat exchanger.
The utility model discloses a "a high vacuum rectifying column for chemical industry dangerous useless trade" is disclosed in prior art CN202021162447.6, wherein, including the gas phase balance pipe, the below of rectifying column steam inlet still is equipped with the backward flow entry, the one end of gas phase balance pipe and the entry intercommunication of circulating pump, the other end and backward flow entry intercommunication for gas at the entrance of circulating pump discharges into the rectifying column via the backward flow entry under the suction of top of the tower high vacuum in order to avoid the circulating pump entrance to take place the cavitation, the technical problem that prior art investment is big, weight is big has been solved.
Disclosure of Invention
The utility model aims to solve the problems in the prior art and provides a multi-effect rectification system. In the technical scheme, through the arrangement of the rectifying tower, the reboiler, the condenser, the reflux tank and the pipeline, the noncondensable gas phase at the shell pass high point on the reboiler in the rectifying unit can be discharged in time, the heat transfer of the reboiler is facilitated, the rectifying efficiency and the rectifying quality are further improved, the rectification heat source is saved, and the like.
In order to achieve the technical purpose, the following technical scheme is proposed:
a multi-effect rectification system comprises at least two rectification units, wherein each rectification unit comprises a rectification tower, a reboiler, a condenser and a reflux tank, the middle part of each rectification tower is connected with a feeding pipe I, a liquid phase outlet at the lower part of each rectification tower is connected with a liquid phase inlet on the reboiler, a gas phase outlet on the reboiler is connected with a gas phase inlet at the lower part of each rectification tower, and a circulation passage for vaporizing a liquid phase at the lower part of each rectification tower is formed among the liquid phase outlet at the lower part of each rectification tower, the liquid phase inlet on the reboiler, the gas phase outlet on the reboiler and the gas phase inlet at the lower part of each rectification tower, so that the rectification quality and the rectification efficiency are improved;
the lower part of the rectifying tower is connected with a discharge pipe;
the top of the rectifying tower is connected with a reboiler in the next rectifying unit through a gas phase pipe, the reboiler in the next rectifying unit is connected with an inlet of a condenser through a conveying pipe, an outlet of the condenser is connected with a reflux tank, the reflux tank is connected with the upper part of the rectifying tower through a reflux pipe, and a circulation passage which is formed among the gas phase pipe, the reboiler in the next rectifying unit, the conveying pipe, the condenser, the reflux tank and the reflux pipe, is changed into a liquid phase after gas phase heat energy in the rectifying tower is utilized, and then the liquid phase flows back to the rectifying tower is formed;
a shell-side high-point exhaust port on the reboiler in the next rectification unit is connected with the condenser and the reflux tank through a gas phase balance pipe, and at the moment, the gas phase temperature transmitted to the condenser and the reflux tank is subjected to heat exchange through the reboiler, so that the temperature is reduced, and the energy is saved; in addition, the noncondensable gas phase at the high point of the shell pass on the reboiler in the next rectification unit can be discharged in time, so that the heat transfer of the reboiler is facilitated, the rectification efficiency and quality are improved, the consumption of the rectification heat source is saved, and the like.
Further, the liquid phase inlet is arranged at the lower part of the reboiler, and the gas phase outlet is arranged at the top of the reboiler.
Furthermore, a reflux pump is arranged on the reflux pipe.
Furthermore, the return pipe is connected with a rectifying tower in the next rectifying unit through a feeding pipe II.
In this technical scheme, according to the actual demand, set up the governing valve between each part and on the pipeline.
The positional relationships such as "middle part", "lower part", "top part" and "upper part" in the present technical solution are defined according to the actual usage conditions, and are conventional terms in the technical field and also conventional terms in the actual usage process of the person skilled in the art.
By adopting the technical scheme, the beneficial technical effects brought are as follows:
in the utility model, through the specific arrangement of the rectifying tower, the reboiler, the condenser, the reflux tank, the pipeline and the like, the noncondensable gas phase (such as H) at the high point of the shell pass on the reboiler in the rectifying unit can be discharged in time on the premise of ensuring the rectifying efficiency and the quality2、N2) The heat transfer of the reboiler is facilitated, the rectification efficiency and quality are further improved, the saving of a rectification heat source is realized, and the like;
wherein, with the interface setting on gas phase balance pipe and the reboiler at shell side high point gas vent, at this moment, the gas phase temperature of transmitting to reflux drum and condenser can be through the reboiler heat transfer, and the temperature effectively reduces, and energy saving consumes to and, the noncondensable gaseous phase of timely row clean reboiler shell side high point is favorable to the reboiler to transfer heat.
Drawings
FIG. 1 is a schematic diagram of the logical connections of the present invention;
FIG. 2 is a schematic diagram of the operation of the present invention;
in the figure, 1, a rectifying tower, 2, a reboiler, 3, a condenser, 4, a reflux tank, 5, a feeding pipe I, 6, a liquid phase outlet, 7, a liquid phase inlet, 8, a gas phase outlet, 9, a gas phase inlet, 10, a discharging pipe, 11, a gas phase pipe, 12, a reboiler in the next rectifying unit, 13, a conveying pipe, 14, a condenser inlet, 15, a condenser outlet, 16, a reflux pipe, 17, a shell side high point exhaust port, 18, a gas phase balance pipe, 19, a reflux pump, 20, a rectifying tower in the next rectifying unit, 21 and a feeding pipe II.
Detailed Description
In the following, the technical solutions in the embodiments of the present invention are clearly and completely described, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
As shown in fig. 1-2: a multi-effect rectification system comprises at least two rectification units, wherein each rectification unit comprises a rectification tower 1, a reboiler 2, a condenser 3 and a reflux tank 4, the middle part of the rectification tower 1 is connected with a feeding pipe I5, a liquid phase outlet 6 at the lower part of the rectification tower 1 is connected with a liquid phase inlet 7 on the reboiler 2, a gas phase outlet 8 on the reboiler 2 is connected with a gas phase inlet 9 at the lower part of the rectification tower 1, a liquid phase outlet 6 at the lower part of the rectification tower 1, the liquid phase inlet 7 on the reboiler 2, a gas phase outlet 8 on the reboiler 2 and the gas phase inlet 9 at the lower part of the rectification tower 1 form a circulation passage through which a liquid phase at the lower part of the rectification tower 1 is vaporized, and then the rectification quality and the efficiency are improved;
the lower part of the rectifying tower 1 is connected with a discharge pipe 10;
the top of the rectifying tower 1 is connected with a reboiler 12 in the next rectifying unit through a gas-phase pipe 11, the reboiler 12 in the next rectifying unit is connected with a condenser inlet 14 through a delivery pipe 13, a condenser outlet 15 is connected with a reflux tank 4, the reflux tank 4 is connected with the upper part of the rectifying tower 1 through a reflux pipe 16, and a circulation passage for converting gas-phase heat energy in the rectifying tower 1 into liquid phase after being utilized and then refluxing to the rectifying tower 1 is formed among the gas-phase pipe 11, the reboiler 12 in the next rectifying unit, the delivery pipe 13, the condenser 3, the reflux tank 4 and the reflux pipe 16;
a shell-side high-point exhaust port 17 on the reboiler 12 in the next rectification unit is connected with the condenser 3 and the reflux tank 4 through a gas phase balance pipe 18, and at the moment, the gas phase temperature transmitted to the condenser 3 and the reflux tank 4 is subjected to heat exchange through the reboiler 2, so that the temperature is reduced, and the energy is saved; in addition, the noncondensable gas phase at the high point of the shell side of the reboiler 12 in the next rectification unit can be discharged in time, which is beneficial to the heat transfer of the reboiler 2, further improves the rectification efficiency and quality, and realizes the saving of the consumption of the rectification heat source.
Example 2
Based on the embodiment 1, the present embodiment is further,
a liquid phase inlet 7 is arranged at the lower part of the reboiler 2 and a gas phase outlet 8 is arranged at the top of the reboiler 2.
Example 3
Based on the embodiment 1, the present embodiment is further,
the return pipe 16 is provided with a return pump 19.
Example 4
Based on the embodiment 1, the present embodiment is further,
the return pipe 16 is connected to the rectifying tower 20 in the next rectifying unit.
In addition, according to the actual demand, set up governing valve between each part and on the pipeline.
Claims (4)
1. A multi-effect rectification system is characterized in that: the device comprises at least two rectifying units, wherein each rectifying unit comprises a rectifying tower (1), a reboiler (2), a condenser (3) and a reflux tank (4), the middle part of each rectifying tower (1) is connected with a feeding pipe I (5), a liquid phase outlet (6) at the lower part of each rectifying tower (1) is connected with a liquid phase inlet (7) on each reboiler (2), a gas phase outlet (8) on each reboiler (2) is connected with a gas phase inlet (9) at the lower part of each rectifying tower (1), a liquid phase outlet (6) at the lower part of each rectifying tower (1), a liquid phase inlet (7) on each reboiler (2), a gas phase outlet (8) on each reboiler (2) and a gas phase inlet (9) at the lower part of each rectifying tower (1) form a circulation passage for vaporizing a liquid phase at the lower part of each rectifying tower (1);
the lower part of the rectifying tower (1) is connected with a discharge pipe (10);
the top of the rectifying tower (1) is connected with a reboiler (12) in the next rectifying unit through a gas phase pipe (11), the reboiler (12) in the next rectifying unit is connected with a condenser inlet (14) through a conveying pipe (13), a condenser outlet (15) is connected with a reflux tank (4), the reflux tank (4) is connected with the upper part of the rectifying tower (1) through a reflux pipe (16), and a circulation passage which is formed among the gas phase pipe (11), the reboiler (12) in the next rectifying unit, the conveying pipe (13), the condenser (3), the reflux tank (4) and the reflux pipe (16) and is used for converting gas phase heat energy in the rectifying tower (1) into liquid phase and then refluxing to the rectifying tower (1) is formed;
and a shell side high-point exhaust port (17) on the reboiler (12) in the next rectification unit is connected with the condenser (3) and the reflux tank (4) through a gas phase balance pipe (18).
2. The multi-effect rectification system of claim 1, wherein: the liquid phase inlet (7) is arranged at the lower part of the reboiler (2), and the gas phase outlet (8) is arranged at the top of the reboiler (2).
3. The multi-effect rectification system of claim 1, wherein: a return pump (19) is arranged on the return pipe (16).
4. The multi-effect rectification system as claimed in claim 1 or 3, wherein: the return pipe (16) is connected to a rectification column (20) in the next rectification unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121983631.1U CN216170029U (en) | 2021-08-23 | 2021-08-23 | Multi-effect rectification system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121983631.1U CN216170029U (en) | 2021-08-23 | 2021-08-23 | Multi-effect rectification system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216170029U true CN216170029U (en) | 2022-04-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121983631.1U Active CN216170029U (en) | 2021-08-23 | 2021-08-23 | Multi-effect rectification system |
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|---|---|
| CN (1) | CN216170029U (en) |
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2021
- 2021-08-23 CN CN202121983631.1U patent/CN216170029U/en active Active
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Sichuan Yongxiang Energy Technology Co.,Ltd. Assignor: SICHUAN YONGXIANG NEW ENERGY Co.,Ltd. Contract record no.: X2023510000014 Denomination of utility model: A multi effect distillation system Granted publication date: 20220405 License type: Common License Record date: 20230816 |
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| EE01 | Entry into force of recordation of patent licensing contract |