CN215387629U - Mechanical chemical medium vapor recompression rectification device - Google Patents

Mechanical chemical medium vapor recompression rectification device Download PDF

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Publication number
CN215387629U
CN215387629U CN202120417715.2U CN202120417715U CN215387629U CN 215387629 U CN215387629 U CN 215387629U CN 202120417715 U CN202120417715 U CN 202120417715U CN 215387629 U CN215387629 U CN 215387629U
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boiling
inlet
point substance
outlet
reboiler
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CN202120417715.2U
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杨金顺
李啸
杨展
朱荣声
旷逊
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Zhejiang Chenxuan Turbine Manufacturing Co ltd
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Zhejiang Chenxuan Turbine Manufacturing Co ltd
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Abstract

The utility model relates to a mechanical chemical medium vapor recompression rectification device. The utility model comprises a feed pump, a preheater, a rectifying tower, a compressor, a reboiler, a finished product storage tank, a reflux circulating pump, a high-boiling-point substance circulating pump and a high-boiling-point substance storage tank. The utility model recycles the latent heat of the purified low-boiling-point substance steam, and the low-boiling-point substance steam is pressurized and heated by the compressor to be used as a heat source of the reboiler, so that the steam consumed by the traditional rectifying device is not needed when the device is in normal operation. The purified low-boiling-point substance steam releases heat energy in the reboiler to be condensed, thereby saving the cooling water consumed in the condenser of the traditional rectifying device and the load and consumption of a cooling water cooling device. And recovering sensible heat of the purified low-boiling-point substance by using a preheater.

Description

Mechanical chemical medium vapor recompression rectification device
Technical Field
The utility model belongs to the technical field of chemical industry, and relates to a mechanical chemical medium vapor recompression rectification device.
Background
The Mechanical Vapor Recompression (MVR) technology is an energy-saving technology which utilizes secondary vapor generated by an evaporation system to compress the secondary vapor by a vapor compressor to do work, improves the heat energy grade of the secondary vapor, enables the secondary vapor to be used as a heat source of the evaporation system to be recycled, and reduces the requirement on external energy. However, at present, the technology is mainly used for an evaporation system in which a water vapor medium is reused by universal mechanical compression. The utility model uses special mechanical compression to compress the chemical medium steam which is generated in the chemical rectification device and is rectified, so as to improve the pressure and the temperature of the chemical medium steam, and the chemical medium steam is used as a heat source of a reboiler in the rectification device.
As shown in fig. 1, a conventional rectification apparatus comprises a feed pump, a rectification column, a condenser, a product tank, a reflux circulation pump, a receiving tank (which can be replaced by a bottom section of the rectification column), a reboiler, a high-boiling substance circulation pump, a high-boiling substance storage tank, and the like.
The crude product material is pumped into the middle part of the rectifying tower through a feed pump, and directly exchanges heat with rising low-boiling-point substance steam and downward flowing high-boiling-point substance in the tower from the downward flowing to the stripping section. The low-boiling-point substance is changed into steam and rises to the rectifying section, and the steam and the finished product pumped to the upper part of the tower by the reflux circulating pump are subjected to countercurrent mass transfer and purification, then enter the hot side of the condenser through a pipeline from the top of the tower, are subjected to indirect heat exchange with cooling circulating water and are condensed and then enter a finished product storage tank. And (4) part of the finished product is fed into a rectifying section at the upper part of the rectifying tower through the reflux circulating pump for mass transfer purification, and part of the finished product is output as a product. The high-boiling-point substance (including the high-boiling-point substance heated by the reboiler) is used as a heat source in the process of flowing the liquid phase under the stripping section to vaporize and evaporate the low-boiling-point substance in the crude material to move upwards. The high-boiling-point substance flowing down enters the receiving tank from the bottom of the tower, then is pumped into the cold side of the reboiler through the high-boiling-point substance circulating pump, and enters the stripping section at the lower part of the rectifying tower as a heat source for crude product stripping after indirectly exchanging heat with water vapor at the hot side and heating. And pumping the redundant high-boiling-point substances in the receiving tank to a high-boiling-point substance storage tank through a high-boiling-point substance circulating pump to be used as a byproduct for storage.
The traditional rectifying device needs to continuously provide hot steam for the system, a large amount of cooling water needs to be consumed in a condenser, and the defects of excessive energy and resource consumption exist. The utility model improves the traditional rectification technical device by utilizing the mechanical vapor recompression technology, recycles the heat carried by the purified low-boiling-point substance vapor, reduces the energy consumption of products and does not need to consume cooling water.
Disclosure of Invention
The utility model aims to provide a mechanical chemical medium vapor recompression rectification device, which utilizes the Mechanical Vapor Recompression (MVR) technology to improve the traditional rectification technical device and aims to recycle the heat (mainly latent heat) carried by low-boiling-point substance vapor after rectification and purification and reduce the energy consumption of products.
A mechanical chemical medium vapor recompression rectification device comprises a feed pump, a preheater, a rectification tower, a compressor, a reboiler, a finished product storage tank, a reflux circulating pump, a high-boiling-point substance storage tank and the like. The inlet of the feed pump is a crude product inlet, and the outlet of the feed pump is connected with the inlet of the cold side of the preheater; the outlet of the cold side of the preheater is connected with the inlet of the middle part of the rectifying tower, and the outlet of the low-boiling-point substance of the rectifying tower is connected with the inlet of the compressor; the outlet of the compressor is connected with the inlet of the hot side of the reboiler, and the outlet of the hot side of the reboiler is connected with the inlet of the hot side of the preheater; the outlet of the hot side of the preheater is connected with the inlet of a finished product storage tank, and the outlet of the finished product storage tank is connected with the inlet of a reflux circulating pump; the outlet of the reflux circulating pump is divided and respectively connected with the inlet of the rectifying section of the rectifying tower and an output finished product; a high-boiling-point substance outlet of the rectifying tower is connected with an inlet of a high-boiling-point substance circulating pump, an outlet of the high-boiling-point substance circulating pump is respectively connected with a cold-side inlet of the reboiler and an inlet of a high-boiling-point substance storage tank, and the high-boiling-point substance is output; the outlet of the cold side of the reboiler is connected with the inlet of the stripping section of the rectifying tower.
The high-boiling-point substance outlet of the rectifying tower is connected with the inlet of the high-boiling-point substance circulating pump through the receiving groove.
Preferably, the high-boiling-point substance circulating pump adopts a centrifugal submerged pump.
The utility model recycles the latent heat of the steam of the purified low-boiling-point substance, and the latent heat is pressurized and heated by the compressor and then is used as the heat source of the reboiler, so that the steam consumed by the traditional rectifying device is not needed when the device is in normal operation. The purified low-boiling-point substance steam releases heat energy in the reboiler to be condensed, thereby saving the cooling water consumed in the traditional rectifying device and the load and consumption of a cooling water cooling device. And recovering sensible heat of the purified low-boiling-point substance by using a preheater.
Drawings
FIG. 1 is a schematic flow diagram of a conventional rectification apparatus;
FIG. 2 is a schematic flow chart of the present invention;
Detailed Description
As shown in fig. 2, a mechanical chemical medium vapor recompression rectification device comprises a feed pump, a preheater, a rectification tower, a compressor, a reboiler, a finished product storage tank, a reflux circulating pump, a receiving tank (which can be replaced by a rectification tower bottom section), a high-boiling-point substance circulating pump and a high-boiling-point substance storage tank.
The crude product is sucked into the inlet of the preheater by a feed pump and then enters the preheater through the outlet of the feed pump, and the outlet of the feed pump is connected with the feed inlet of the preheater. The cold side inlet of the preheater is connected with a feed pump, the cold side outlet of the preheater is connected with the rectifying tower, and the hot side inlet of the preheater is connected with the reboiler, and the hot side outlet of the preheater is connected with the finished product storage tank. And pumping the crude product into a preheater by a feed pump for heat exchange and temperature rise, and feeding the crude product subjected to heat exchange and temperature rise into the middle part of the rectifying tower. The inlet of the middle part of the rectifying tower is connected with the outlet of the cold side of the preheater, the inlet of the rectifying section of the rectifying tower is connected with the outlet of the reflux circulating pump, the inlet of the stripping section of the rectifying tower is connected with the outlet of the hot side of the reboiler, the steam outlet of the low-boiling-point substance of the rectifying tower is connected with the compressor, and the outlet of the high-boiling-point substance of the rectifying tower is connected with the receiving tank. The crude product entering the middle part of the rectifying tower flows downwards in the tower to a stripping section to directly exchange heat with ascending low-boiling-point substance steam and descending high-boiling-point substance liquid, the low-boiling-point substance is changed into steam and ascends to the rectifying section, and the steam and the finished product are pumped to the upper part of the tower through a reflux circulating pump to carry out countercurrent mass transfer purification, and then enter a compressor from the top of the tower through a pipeline to be pressurized and heated. The steam outlet of the low-boiling-point substance at the top of the rectifying tower is connected with the inlet of a compressor, and the outlet of the compressor is connected with the inlet of the hot side of the reboiler. The hot side inlet of the reboiler is connected with the outlet of the compressor, and the hot side outlet of the reboiler is connected with the hot side inlet of the preheater; the outlet of the cold side of the reboiler is connected with the inlet of the stripping section at the lower part of the rectifying tower, and the inlet of the cold side of the reboiler is connected with the high-boiling-point substance circulating pump. The low-boiling-point substance finished product pressurized and heated by the compressor enters a reboiler, is indirectly subjected to heat exchange and condensation with high-boiling-point substances, then is connected with the preheater through a hot side outlet of the reboiler, enters the preheater for heat exchange again and is cooled, and then enters a finished product storage tank inlet through a pipeline which is connected with the finished product storage tank through the preheater, a finished product storage tank outlet is connected with an inlet of a reflux circulating pump, an outlet of the reflux circulating pump is divided, one is connected with a rectifying tower, and the other is connected with a finished product output. The rectifying tower high-boiling substance outlet is connected with the inlet of the receiving tank, the outlet of the receiving tank is connected with the inlet of the high-boiling substance circulating pump, the outlet of the high-boiling substance circulating pump is divided into three interfaces, one interface is connected with the reboiler, the other interface is connected with the high-boiling substance storage tank, and the other interface is used for outputting the high-boiling substance. The high-boiling-point substance (including the high-boiling-point substance heated by the reboiler) is used as a heat source in the process that the liquid phase flows down in the stripping section to vaporize and evaporate the low-boiling-point substance in the crude material to flow upwards. The high-boiling-point substance flowing down enters the receiving tank from the bottom of the tower, then is pumped into the cold side of the reboiler through the high-boiling-point substance circulating pump, and indirectly exchanges heat with the low-boiling-point substance steam with the hot side heated by the pressure of the compressor, and then enters the stripping section at the lower part of the rectifying tower to be used as a heat source for crude product stripping. And pumping the redundant high-boiling-point substances in the receiving tank to a high-boiling-point substance storage tank through a high-boiling-point substance circulating pump to be used as a byproduct for storage.
For the existing project, the original device can be kept basically still, and a compressor unit, a reboiler, a preheater and other equipment are additionally arranged.

Claims (3)

1. A mechanical chemical medium vapor recompression rectification device is characterized in that: comprises a feed pump, a preheater, a rectifying tower, a compressor, a reboiler, a finished product storage tank, a reflux circulating pump, a high-boiling-point substance circulating pump and a high-boiling-point substance storage tank; the inlet of the feed pump is a crude product inlet, and the outlet of the feed pump is connected with the inlet of the cold side of the preheater; the outlet of the cold side of the preheater is connected with the inlet of the middle part of the rectifying tower, and the outlet of the low-boiling-point substance of the rectifying tower is connected with the inlet of the compressor; the outlet of the compressor is connected with the inlet of the hot side of the reboiler, and the outlet of the hot side of the reboiler is connected with the inlet of the hot side of the preheater; the outlet of the hot side of the preheater is connected with the inlet of a finished product storage tank, and the outlet of the finished product storage tank is connected with the inlet of a reflux circulating pump; the outlet of the reflux circulating pump is divided and respectively connected with the inlet of the rectifying section of the rectifying tower and an output finished product; a high-boiling-point substance outlet of the rectifying tower is connected with an inlet of a high-boiling-point substance circulating pump, an outlet of the high-boiling-point substance circulating pump is respectively connected with a cold-side inlet of the reboiler and an inlet of a high-boiling-point substance storage tank, and the high-boiling-point substance is output; the outlet of the cold side of the reboiler is connected with the inlet of the stripping section of the rectifying tower.
2. The mechanical chemical medium vapor recompression rectification device as recited in claim 1, wherein: the outlet of the rectifying tower for high-boiling residue is connected with the inlet of the high-boiling residue circulating pump through the receiving groove.
3. The mechanical chemical medium vapor recompression rectification device as recited in claim 1, wherein: the high-boiling substance circulating pump adopts a centrifugal submerged pump.
CN202120417715.2U 2021-02-25 2021-02-25 Mechanical chemical medium vapor recompression rectification device Active CN215387629U (en)

Priority Applications (1)

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CN202120417715.2U CN215387629U (en) 2021-02-25 2021-02-25 Mechanical chemical medium vapor recompression rectification device

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Application Number Priority Date Filing Date Title
CN202120417715.2U CN215387629U (en) 2021-02-25 2021-02-25 Mechanical chemical medium vapor recompression rectification device

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112827207A (en) * 2021-02-25 2021-05-25 浙江宸轩透平机制造有限公司 Mechanical chemical medium vapor recompression rectification device and method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112827207A (en) * 2021-02-25 2021-05-25 浙江宸轩透平机制造有限公司 Mechanical chemical medium vapor recompression rectification device and method

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