CN210728749U

CN210728749U - Propylene degassing system

Info

Publication number: CN210728749U
Application number: CN201921293644.9U
Authority: CN
Inventors: 汪乃东; 李汉初; 许多琦; 范连锋
Original assignee: Dongguan Juzhengyuan Technology Co Ltd
Current assignee: Dongguan Juzhengyuan Technology Co Ltd
Priority date: 2019-08-06
Filing date: 2019-08-09
Publication date: 2020-06-12
Anticipated expiration: 2029-08-09

Abstract

The utility model discloses a propylene degassing system, which comprises a degassing tower, a heating device which is arranged in the degassing tower and used for heating liquid propylene, and a condensing device which is used for condensing the liquid propylene; the degassing tower comprises a degassing cavity, a feeding pipe, a discharging pipe, a vent pipe and a heat exchange mechanism, wherein the feeding pipe is communicated with the degassing cavity and is used for conveying liquid propylene to enter the degassing cavity, the discharging pipe is communicated with the degassing cavity and is used for conveying the liquid propylene to be discharged out of the degassing cavity, the vent pipe is used for communicating the top of the degassing cavity with the outside of the degassing tower, the degassing system further comprises the heat exchange mechanism, the heat exchange mechanism comprises a first heat exchange assembly and a second heat exchange assembly, the first heat exchange assembly is used for preheating the liquid propylene before entering the degassing tower, the liquid propylene before entering a condensing device is cooled, a heat exchange medium outlet of the first heat exchange assembly is communicated with a heat exchange medium inlet of the second heat exchange assembly, and a. The utility model discloses a propylene degasification system has advantages such as the energy consumption is low.

Description

Propylene degassing system

Technical Field

The utility model relates to a propylene production facility field especially relates to a propylene degasification system.

Background

In the UNIPOL polypropylene production process, in the production process of a propylene raw material, the process flow of propylene degassing is as follows: the propylene raw material is conveyed into a degassing tower, and then heated by a propylene reboiler, and light component impurities such as oxygen, carbon monoxide, carbon dioxide and the like are removed from the tower top. However, when the demand of propylene is large, the degassing tower is required to perform rapid degassing, which has a high demand on the capacity of an ethylene reboiler, and if the degassing capacity needs to be increased, the power of the ethylene reboiler needs to be increased, and the energy consumption is increased; in addition, the liquid propylene discharged from the bottom of the column needs to be cooled, which also has high requirements on a condensing device, and the power of the condensing device needs to be increased to meet the requirement of the condensing amount, so that the energy consumption is increased. Therefore, the existing propylene degassing system needs to increase energy consumption when the propylene supply load is large, and corresponding equipment needs to be replaced when the power of a propylene reboiler and a condensing device cannot be adjusted on the equipment, so that inconvenience is brought to use.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects of the prior art, the utility model aims to provide a propylene degassing system with low energy consumption.

The purpose of the utility model is realized by adopting the following technical scheme:

a propylene degassing system comprises a degassing tower, a heating device arranged in the degassing tower and used for heating liquid propylene, and a condensing device used for condensing the degassed liquid propylene; the degassing tower includes the degasification chamber, communicates with the degasification chamber and is used for carrying liquid propylene to get into the inlet pipe in degasification chamber, communicate with the degasification chamber and be used for carrying liquid propylene discharging degasification chamber discharging pipe, be used for communicating degasification chamber top and the outside blast pipe of degassing tower, the degasification system still includes heat transfer mechanism, heat transfer mechanism is including being used for getting into the first heat transfer subassembly that liquid propylene preheated before the degasification tower and getting into the second heat transfer subassembly of the liquid propylene cooling before the condensing equipment, the heat transfer medium export of first heat transfer subassembly and the heat transfer medium entry intercommunication of second heat transfer subassembly, the heat transfer medium entry of first heat transfer subassembly and the heat transfer medium export intercommunication of second heat transfer subassembly.

The utility model discloses in, further preferred scheme does, still be equipped with the power device who supplies the heat transfer medium at heat transfer mechanism internal loop between first heat exchange assemblies and the second heat exchange assemblies.

The utility model discloses in, further preferred scheme does, power device is the circulating pump.

The utility model discloses in, further preferred scheme does, the inlet pipe is linked together with the middle part in degasification chamber, the discharging pipe is linked together with the bottom in degasification chamber, heating device sets up in degasification chamber bottom.

In the utility model, a further preferred scheme is that the propylene degassing system further comprises a first propylene delivery pump and a second propylene delivery pump, wherein one end of the first propylene delivery pump is communicated with the other end of the feeding pipe and is used for being communicated with an external propylene supply device; one end of the second propylene conveying pump is communicated with the other end of the discharge pipe and is used for being communicated with an external propylene storage device.

The utility model discloses in, further preferred scheme does, propylene degasification system still includes high-pressure torch, high-pressure torch includes the inlet end, inlet end and blast pipe intercommunication.

In the utility model, a further preferred scheme does, heating device is the propylene reboiler.

The utility model discloses in, further preferred scheme does, propylene degasification system still is provided with the thermometer that is used for monitoring the inside propylene temperature in degasification chamber and is used for monitoring the level gauge of the inside liquid propylene liquid level height in degasification chamber.

The utility model discloses in, further preferred scheme does, all be provided with the valve on inlet pipe, discharging pipe and the blast pipe.

The utility model discloses in, further preferred scheme does, the degasification intracavity is equipped with the manometer that is used for detecting degasification intracavity pressure size.

Compared with the prior art, the beneficial effects of the utility model reside in that: through the arrangement of the structure, the heat exchange mechanism is additionally arranged on the existing propylene degassing system, and the liquid propylene before entering the degassing tower is preheated by utilizing the heat exchange mechanism, so that the energy consumption of the propylene reboiler for heating the liquid propylene can be reduced, more liquid propylene can be heated under the same energy consumption, and the requirement of high load is further met; in addition, the liquid propylene discharged from the degassing tower and before entering the condensing device is pre-cooled by the heat exchange mechanism, so that the energy consumption for cooling the liquid propylene is reduced, more liquid propylene can be cooled under the same energy consumption, and the requirement of high load is further met; just so need not to change heating device and condensing equipment, perhaps increase its power consumption, just can satisfy the degasification needs of high load, heat transfer mechanism passes through the circulation simultaneously, is used for preheating and the cooling in advance of liquid propylene with the heat for whole degasification system has energy-concerving and environment-protective advantage.

Drawings

FIG. 1 is a propylene degassing system of example 1;

wherein, 1, a degassing tower; 10. a degassing chamber; 11. a feed pipe; 12. a discharge pipe; 13. an exhaust pipe; 2. A heating device; 3. a condensing unit; 4. a second heat exchange assembly; 5. a first heat exchange assembly; 6. and a power device.

Detailed Description

The present invention will be further described with reference to the following detailed description, and it should be noted that, in the premise of no conflict, the embodiments or technical features described below can be arbitrarily combined to form a new embodiment.

Through the arrangement of the structure, the heat exchange mechanism is additionally arranged on the existing propylene degassing system, and the liquid propylene before entering the degassing tower is preheated by utilizing the heat exchange mechanism, so that the energy consumption of the propylene reboiler for heating the liquid propylene can be reduced, more liquid propylene can be heated under the same energy consumption, and the requirement of high load is further met; in addition, the liquid propylene discharged from the degassing tower and before entering the condensing device is pre-cooled by the heat exchange mechanism, so that the energy consumption for cooling the liquid propylene is reduced, more liquid propylene can be cooled under the same energy consumption, and the requirement of high load is further met; just so need not to change heating device and condensing equipment, perhaps increase its power consumption, just can satisfy the degasification needs of high load, heat transfer mechanism passes through the circulation simultaneously, is used for preheating and the cooling in advance of liquid propylene with the heat for whole degasification system has energy-concerving and environment-protective advantage.

In order to be more beneficial to the circulation of the medium in the heat exchange mechanism, a power device for circulating the heat exchange medium in the heat exchange mechanism is also arranged between the first heat exchange assembly and the second heat exchange assembly; the power plant may be a circulation pump.

In order to make the heating more efficient and to better achieve the degassing treatment, the feeding pipe is communicated with the middle part of the degassing cavity, the discharging pipe is communicated with the bottom part of the degassing cavity, and the heating device is arranged at the bottom part of the degassing cavity.

In order to better convey and discharge propylene out of the degassing cavity, the propylene degassing system further comprises a first propylene conveying pump and a second propylene conveying pump, wherein one end of the first propylene conveying pump is communicated with the feeding pipe, and the other end of the first propylene conveying pump is communicated with an external propylene supply device; one end of the second propylene conveying pump is communicated with the other end of the discharge pipe and is used for being communicated with an external propylene storage device.

For better processing of tail gas, the propylene degassing system further comprises a high-pressure torch, wherein the high-pressure torch comprises a gas inlet end, and the gas inlet end is communicated with a gas exhaust pipe. Therefore, the discharged tail gas is combusted and treated by a high-pressure torch, and the polluted gas is further treated, so that the method is more environment-friendly.

As for the heating device, it may be a heating structure commonly used in the art, such as an electric heating mechanism, a steam heating structure, etc., and a specific heating device may be a propylene reboiler.

In order to facilitate monitoring of the level and temperature of the propylene inside the degassing chamber, the propylene degassing system is further provided with a thermometer for monitoring the temperature of the propylene inside the degassing chamber and a level gauge for monitoring the level of the liquid propylene inside the degassing chamber.

In order to facilitate the communication or the closing among all the parts, the feeding pipe, the discharging pipe and the exhaust pipe are provided with valves, so that the valves can be opened and closed according to actual needs.

In order to facilitate the detection of the air pressure in the degassing cavity, a pressure gauge for detecting the pressure in the degassing cavity is arranged in the degassing cavity.

Example 1

A propylene degassing system comprises a degassing tower 1, a heating device 2 arranged in the degassing tower and used for heating liquid propylene, and a condensing device 3 used for condensing the degassed liquid propylene; the degassing system comprises a degassing tower, a heat exchange mechanism and a heat exchange device, wherein the degassing tower comprises a degassing cavity 10, a feeding pipe 11 which is communicated with the degassing cavity and used for conveying liquid propylene to enter the degassing cavity, a discharging pipe 12 which is communicated with the degassing cavity and used for conveying liquid propylene to be discharged out of the degassing cavity, and a discharging pipe 13 which is used for communicating the top of the degassing cavity with the outside of the degassing tower; a power device 6 for circulating a heat exchange medium in the heat exchange mechanism is also arranged between the first heat exchange assembly and the second heat exchange assembly; the power device is a circulating pump; the feeding pipe is communicated with the middle part of the degassing cavity, the discharging pipe is communicated with the bottom of the degassing cavity, and the heating device is arranged at the bottom of the degassing cavity; the heating device is a propylene reboiler.

Example 2

In this embodiment, the propylene degassing system further includes a first propylene delivery pump and a second propylene delivery pump, wherein one end of the first propylene delivery pump is communicated with the feeding pipe, and the other end of the first propylene delivery pump is communicated with an external propylene supply device; one end of the second propylene conveying pump is communicated with the discharge pipe, and the other end of the second propylene conveying pump is communicated with an external propylene storage device; the propylene degassing system further comprises a high-pressure torch, the high-pressure torch comprises a gas inlet end, the gas inlet end is communicated with the exhaust pipe, and the rest of the structure, the parts and the like are the same as those in the embodiment 1.

Example 3

In this embodiment, the propylene degassing system is further provided with a thermometer for monitoring the temperature of propylene in the degassing chamber and a liquid level gauge for monitoring the liquid propylene liquid level in the degassing chamber; valves are arranged on the feeding pipe, the discharging pipe and the exhaust pipe; the degassing cavity is internally provided with a pressure gauge for detecting the pressure in the degassing cavity, and the rest structures, parts and the like are the same as those in the embodiment 1.

The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention cannot be limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are all within the protection scope of the present invention.

Claims

1. A propylene degassing system comprises a degassing tower, a heating device arranged in the degassing tower and used for heating liquid propylene, and a condensing device used for condensing the degassed liquid propylene; the degassing tower comprises a degassing cavity, a feeding pipe, a discharging pipe, a vent pipe and a heat exchange mechanism, wherein the feeding pipe is communicated with the degassing cavity and used for conveying liquid propylene to enter the degassing cavity, the discharging pipe is communicated with the degassing cavity and used for conveying the liquid propylene to be discharged from the degassing cavity, the vent pipe is used for communicating the top of the degassing cavity with the outside of the degassing tower, the degassing system further comprises the heat exchange mechanism, the heat exchange mechanism comprises a first heat exchange component and a second heat exchange component, the first heat exchange component is used for preheating the liquid propylene before entering the degassing tower, the second heat exchange component is used for cooling the liquid propylene before entering a condensing device, a heat exchange medium outlet of the first heat exchange component is communicated with a heat exchange medium inlet of the second heat exchange component, and a heat exchange medium inlet of.

2. The propylene degassing system of claim 1, wherein a power device for circulating a heat exchange medium inside the heat exchange mechanism is further arranged between the first heat exchange assembly and the second heat exchange assembly.

3. The propylene degassing system of claim 2, wherein the power plant is a circulation pump.

4. The propylene degassing system of claim 1, wherein the feed pipe communicates with a middle portion of the degassing chamber, the discharge pipe communicates with a bottom portion of the degassing chamber, and the heating device is disposed at the bottom portion of the degassing chamber.

5. The propylene degassing system of claim 1, further comprising a first propylene transfer pump and a second propylene transfer pump, wherein one end of the first propylene transfer pump is communicated with the feeding pipe and the other end is communicated with an external propylene supply device; one end of the second propylene conveying pump is communicated with the other end of the discharge pipe and is used for being communicated with an external propylene storage device.

6. The propylene degassing system of claim 1 further comprising a high pressure flare comprising a gas inlet end in communication with a vent pipe.

7. The propylene degassing system of claim 1, wherein the heating device is a propylene reboiler.

8. The propylene degassing system according to claim 1, further provided with a thermometer for monitoring the temperature of the propylene inside the degassing chamber and a level gauge for monitoring the level of the liquid propylene inside the degassing chamber.

9. The propylene degassing system according to any one of claims 1 to 8, wherein valves are provided in the feed pipe, the discharge pipe and the vent pipe.

10. The degassing system for propylene according to any one of claims 1 to 8, wherein a pressure gauge for measuring the pressure inside the degassing chamber is provided inside the degassing chamber.