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Separation system and process for effectively recovering propylene in the process of non-condensable gas discharge in refrigeration stations

A refrigeration station and propylene technology, applied in the chemical industry, can solve the problems of increased start-up cost and operational difficulty, and achieve the effects of shortened start-up time, efficient recovery, and low equipment investment

Active Publication Date: 2018-10-23
BEIJING PETROCHEM ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above measures increase the start-up cost and operation difficulty, and in the same start-up process, the loss of propylene per unit volume of non-condensable gas is not reduced

Method used

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  • Separation system and process for effectively recovering propylene in the process of non-condensable gas discharge in refrigeration stations

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] This embodiment provides a separation system for effectively recovering propylene during the non-condensable gas discharge process of the refrigeration station, and its structural diagram is as follows figure 1 As shown, the system includes a propylene / non-condensable gas heat exchanger 7 and a propylene separator 8;

[0054] The non-condensable gas outlet of the propylene condenser 3 and the propylene storage tank 4 of the freezing station device is connected to the non-condensable gas inlet in the tube side of the propylene / non-condensable gas heat exchanger 7 through a pipeline;

[0055] The non-condensable gas outlet at the top of the tube side of the propylene / non-condensable gas heat exchanger 7 and the liquid outlet at the bottom of the tube side are respectively connected to the inlet of the propylene separator 8 through pipelines, and the propylene / non-condensable gas heat exchange The outlet of the gaseous propylene in the shell side of the device 7 is connect...

Embodiment 2

[0063] This embodiment provides a separation process for effectively recovering propylene during the non-condensable gas discharge process of a refrigeration station, which is realized by using the system provided in Example 1, wherein the process includes the following specific steps:

[0064] The average non-condensable gas flow rate used in this example is 3800Nm 3 / h, which contains about 92mol% propylene, the pressure is 1.95MPaG, and the temperature is 40°C.

[0065] The start-up non-condensable gas discharged from the top of the propylene condenser 3 and propylene storage tank 4 of the refrigeration station device enters the tube side of the propylene / non-condensable gas heat exchanger 7 for heat exchange and cooling, and its temperature drops to -40°C. Propylene is condensed to form a gas-liquid mixture, which enters the propylene separator 8; non-condensable gas 210Nm is obtained at the top of the propylene separator 8 3 / h, wherein the nitrogen content is 90mol%, de...

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PUM

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Abstract

The invention provides a separation system and a separation technology for effectively recycling propylene during discharge of non-condensable gas of a refrigeration station. The technology comprises the following steps: a, firstly sending propylene coming from the refrigeration station and containing non-condensable gas into a tube pass of a propylene / non-condensable gas heat exchanger to perform heat exchange and cooling, thus obtaining non-condensable gas and a gas-liquid mixture; b, respectively sending the non-condensable gas and the gas-liquid mixture obtained in step a to a propylene separator for separation, thus obtaining the non-condensable gas and a propylene condensate; c, carrying out decompression treatment on the propylene condensate obtained in step b to obtain the propylene condensate after decompression treatment, and sending the propylene condensate after decompression treatment to the tube pass of the propylene / non-condensable gas heat exchanger to perform heat exchange with propylene containing the non-condensable gas in the tube pass, thus obtaining gaseous propylene. The system and the technology provided by the invention can recycle propylene produced during discharge of the non-condensable gas in driving of propylene refrigerating system and can effectively recycle more than or equal to 95% of propylene in the non-condensable gas during driving of the refrigeration station.

Description

technical field [0001] The invention relates to a separation system and process for effectively recovering propylene during the non-condensable gas discharge process of a refrigeration station, belonging to the technical field of chemical industry. Background technique [0002] Non-condensable gases such as air, nitrogen, and lubricating oil vapor often accumulate in the condenser and liquid storage tank of the refrigeration system. These non-condensable gases circulate and accumulate in the propylene refrigeration system, neither condensing with propylene nor producing refrigeration. Effect, the existence of non-condensable gas in the system will greatly weaken the heat transfer effect of the condenser, increase the condensation temperature and pressure, and increase the power consumption of the refrigeration compressor. Therefore, once non-condensable gas accumulates in the refrigeration system, it must be discharged in time. [0003] Non-condensable gas will enter the sy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D5/00B01D1/00F23G7/06
CPCB01D1/00B01D5/0048B01D5/006F23G7/06F23G2209/14
Inventor 汪旭卞潮渊蒋晓伟潘海敏刘莎
Owner BEIJING PETROCHEM ENG