Energy-saving rectifying device

Abstract

The utility model provides an energy -conserving rectifying device, including raw material conveying pipeline, raw material conveying pipeline connects high pressure tower, low pressure tower respectively, high pressure tower connects high pressure tower reboiler, high pressure tower reboiler connects steam generator, steam generator still connects low pressure tower reboiler, low pressure tower reboiler connects low pressure tower, the top of high pressure tower is connected high pressure tower overhead cooler through cooling pipeline, high pressure tower overhead cooler connects tower top re -cooler, tower top re -cooler connects high pressure tower tank pump, high pressure tower tank pump connects tower top product output pipeline. High pressure tower overhead cooler is connected low pressure tower through steam pipeline. The utility model sets up low pressure tower, uses in combination with high pressure tower, carries out the secondary full use to the heat of rectification product of high pressure tower tower top output, saves the energy.

Description

Technical Field

[0001] This utility model relates to the field of distillation apparatus technology, and in particular to an energy-saving distillation apparatus. Background Technology

[0002] Distillation units are commonly used in various chemical engineering scenarios.

[0003] In existing distillation equipment, the top product of the high-pressure column carries a large amount of heat, which needs to be cooled using circulating water. This process of absorbing the heat from the top product through circulating water leads to a waste of heat, and there is an urgent need for a device to utilize this heat. Utility Model Content

[0004] To solve the above-mentioned technical problems, this application provides an energy-saving distillation device, which is achieved through the following technical solution:

[0005] An energy-saving distillation apparatus includes a raw material delivery pipeline connected to a high-pressure tower and a low-pressure tower. The high-pressure tower is connected to a high-pressure tower reboiler, which is connected to a steam generator. The steam generator is also connected to a low-pressure tower reboiler, which is connected to a low-pressure tower. The top of the high-pressure tower is connected to a high-pressure tower top cooler via a cooling pipeline. The high-pressure tower top cooler is connected to a tower top recooler, which is connected to a high-pressure tower bottom pump. The high-pressure tower bottom pump is connected to a top product output pipeline, and the high-pressure tower bottom pump is also connected to the upper part of the high-pressure tower via a reflux pipeline.

[0006] The high-pressure tower top cooler is connected to the low-pressure tower via a steam pipeline. The steam generator is connected to the low-pressure tower standby reboiler via a steam pipeline. The low-pressure tower standby reboiler is connected to a steam branch pipeline. The steam branch pipeline is connected in parallel with the steam pipeline and then connected to the low-pressure tower.

[0007] The top of the low-pressure tower is connected to a low-pressure tower cooler, the low-pressure tower cooler is connected to a low-pressure tower reflux tank, the low-pressure tower reflux tank is connected to a low-pressure tower reflux pump, the low-pressure tower reflux pump is connected to the product output pipeline at the top of the tower, and the low-pressure tower reflux pump is also connected to the upper part of the low-pressure tower through a reflux pipeline.

[0008] As a preferred embodiment, the bottom of the high-pressure tower is connected to a bottom material extraction pump, and the bottom material extraction pump is connected to a bottom product extraction pipeline.

[0009] As a preferred embodiment, the bottom of the low-pressure tower is connected to a low-pressure tower bottom pump, and the low-pressure tower bottom pump is connected to the bottom product extraction pipeline.

[0010] As a preferred embodiment, the low-pressure tower reflux tank is connected to the low-pressure tower vacuum pump.

[0011] Compared with the prior art, the beneficial effects of this utility model are: This utility model is equipped with a low-pressure tower, which is used in combination with a high-pressure tower. A portion of the high-temperature distillation product produced at the top of the high-pressure tower is sent to the low-pressure tower to provide heat for the distillation in the low-pressure tower, so that the raw material liquid in the low-pressure tower boils and achieves distillation. The heat of the distillation product produced at the top of the high-pressure tower is fully utilized for a second time, saving energy.

[0012] When the heat provided by the top cooler of the high-pressure tower to the low-pressure tower is insufficient, the steam generator sends hot steam to the standby reboiler of the low-pressure tower through the steam pipeline. Then, the hot steam is sent to the steam branch pipeline through the standby reboiler of the low-pressure tower, and then from the steam branch pipeline to the steam pipeline, and finally to the low-pressure tower to supplement the heat source of the low-pressure tower and ensure the stable and continuous operation of the entire system. Attached Figure Description

[0013] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0014] Figure 1 This is a schematic diagram of the connection structure of this utility model. Detailed Implementation

[0015] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0016] An energy-saving distillation apparatus includes a raw material conveying pipeline 1, which is connected to a high-pressure tower 2 and a low-pressure tower 3 respectively. The high-pressure tower 2 is connected to a high-pressure tower reboiler 4, and the high-pressure tower reboiler 4 is connected to a steam generator 5.

[0017] The top of the high-pressure tower 2 is connected to the tower top cooler 8 via a cooling pipeline 7. The tower top cooler 8 is connected to the tower top recooler 9. The tower top recooler 9 is connected to the tower bottom pump 10. The tower bottom pump 10 is connected to the tower top product output pipeline 11. The tower bottom pump 10 is also connected to the upper part of the high-pressure tower 2 via a return pipeline 12.

[0018] The high-pressure tower top cooler 8 is connected to the low-pressure tower 3 via steam pipeline 13. The steam generator 5 is connected to the low-pressure tower standby reboiler 6 via steam pipeline 14. The low-pressure tower standby reboiler 6 is connected to steam branch pipeline 15. The steam branch pipeline 15 is connected to the low-pressure tower 3 after being connected in parallel with the steam pipeline 13.

[0019] The top of the low-pressure tower 3 is connected to the low-pressure tower cooler 16, the low-pressure tower cooler 16 is connected to the low-pressure tower reflux tank 17, the low-pressure tower reflux tank 17 is connected to the low-pressure tower reflux pump 18, the low-pressure tower reflux pump 18 is connected to the tower top product output pipeline 11, and the low-pressure tower reflux pump 18 is also connected to the upper part of the low-pressure tower 3 through reflux pipeline 19.

[0020] Furthermore, the bottom of the high-pressure tower 2 is connected to a bottom material extraction pump 20, which is connected to a bottom product extraction pipeline 21.

[0021] Furthermore, the bottom of the low-pressure tower 3 is connected to a low-pressure tower bottom pump 22, and the low-pressure tower bottom pump 22 is connected to the bottom product extraction pipeline 21.

[0022] Furthermore, the low-pressure tower reflux tank 17 is connected to the low-pressure tower vacuum pump 23, which can regulate the pressure inside the low-pressure tower 3.

[0023] When this energy-saving distillation unit is in operation, a mixture of water and ethanol is used as raw material and enters the high-pressure tower 2 and low-pressure tower 3 respectively from the raw material conveying pipeline 1. The high-temperature steam generated in the steam generator 5 is sent to the high-pressure tower 2 through the high-pressure tower reboiler 4 to provide a heat source for the high-pressure tower 2, heating the raw material liquid in the high-pressure tower 2 to make it boil and achieve distillation. The distillation product at the top of the high-pressure tower 2 is sent to the high-pressure tower top cooler 8 through the cooling pipeline 7. After being cooled in the high-pressure tower top cooler 8, it is sent to the top recooler 9 for secondary cooling. After secondary cooling, the temperature drops to the ideal state. The high-pressure tower bottom pump 10 collects the distillation product to the top product output pipeline 11. A portion of the distillation product is also returned to the upper part of the high-pressure tower 2 through the reflux pipeline 12, which can effectively remove excess heat in the high-pressure tower 2, avoid overheating at the top of the tower, maintain the heat balance in the high-pressure tower 2, and ensure that the distillation in the high-pressure tower 2 can be carried out continuously and stably.

[0024] The material produced at the bottom of the high-pressure tower 2 is pumped out by the bottom material pump 20 to the bottom product extraction pipeline 21.

[0025] A portion of the distillation product fed from the top of high-pressure tower 2 into the high-pressure tower top cooler 8 is also fed into low-pressure tower 3 to provide heat for the distillation in low-pressure tower 3, causing the raw material liquid in low-pressure tower 3 to boil. When the heat provided by the high-pressure tower top cooler 8 to low-pressure tower 3 is insufficient, the steam generator 5 sends hot steam to the low-pressure tower standby reboiler 6 through steam pipeline 14, and then through the low-pressure tower standby reboiler 6 to the steam branch pipeline 15. The hot steam is then fed into the low-pressure tower 3 through the steam branch pipeline 15 and then into the steam pipeline 13 to supplement the heat source of low-pressure tower 3.

[0026] The distillation product produced at the top of the low-pressure column 3 is sent to the low-pressure column cooler 16. After being cooled in the low-pressure column cooler 16, it is sent to the low-pressure column reflux tank 17 for secondary cooling. The low-pressure column reflux tank 17 is connected to the low-pressure column reflux pump 18. The low-pressure column reflux pump 18 pumps a portion of the distillation product into the top product output line 8, and another portion of the distillation product flows back to the upper part of the low-pressure column 3 through the reflux line 19. This effectively removes excess heat from the low-pressure column 3, prevents overheating at the top of the column, maintains the heat balance in the low-pressure column 3, and ensures that the distillation in the low-pressure column 3 can proceed continuously and stably.

[0027] The material produced at the bottom of the low-pressure tower 3 is pumped out by the low-pressure tower bottom pump 22 to the bottom product collection pipeline 21.

[0028] The specific implementation of this utility model has been described in detail above, but it is only an example. This utility model is not limited to the specific implementation cases described above, and equivalent modifications to this utility model are also within the protection scope of this utility model.

Claims

1. An energy-saving distillation apparatus, characterized in that, It includes a raw material conveying pipeline (1), which is connected to a high-pressure tower (2) and a low-pressure tower (3) respectively. The high-pressure tower (2) is connected to a high-pressure tower reboiler (4), and the high-pressure tower reboiler (4) is connected to a steam generator (5). The top of the high-pressure tower (2) is connected to the high-pressure tower top cooler (8) via a cooling pipeline (7). The high-pressure tower top cooler (8) is connected to the tower top recooler (9). The tower top recooler (9) is connected to the high-pressure tower bottom pump (10). The high-pressure tower bottom pump (10) is connected to the tower top product output pipeline (11). The high-pressure tower bottom pump (10) is also connected to the upper part of the high-pressure tower (2) via a return pipeline (12). The high-pressure tower top cooler (8) is connected to the low-pressure tower (3) via a steam pipeline (13). The steam generator (5) is connected to the low-pressure tower standby reboiler (6) via a steam pipeline (14). The low-pressure tower standby reboiler (6) is connected to a steam branch pipeline (15). The steam branch pipeline (15) is connected to the low-pressure tower (3) after being connected in parallel with the steam pipeline (13). The top of the low-pressure tower (3) is connected to a low-pressure tower cooler (16), the low-pressure tower cooler (16) is connected to a low-pressure tower reflux tank (17), the low-pressure tower reflux tank (17) is connected to a low-pressure tower reflux pump (18), the low-pressure tower reflux pump (18) is connected to the product output pipeline (11) at the top of the tower, and the low-pressure tower reflux pump (18) is also connected to the upper part of the low-pressure tower (3) through a reflux pipeline (19).

2. The energy-saving distillation apparatus according to claim 1, characterized in that, The bottom of the high-pressure tower (2) is connected to the bottom material extraction pump (20), and the bottom material extraction pump (20) is connected to the bottom product extraction pipeline (21).

3. The energy-saving distillation apparatus according to claim 1, characterized in that, The bottom of the low-pressure tower (3) is connected to the low-pressure tower bottom pump (22), and the low-pressure tower bottom pump (22) is connected to the bottom product collection pipeline (21).

4. The energy-saving distillation apparatus according to claim 1, characterized in that, The low-pressure tower reflux tank (17) is connected to the low-pressure tower vacuum pump (23).

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