Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A system and method for recovering heavy hydrocarbons with carbon three or more in natural gas

A natural gas and heavy hydrocarbon technology, which is applied in the field of natural gas condensate recovery, can solve the problems of large system pressure drop, complicated technical process of mixed hydrocarbon technology, and large number of equipment, and achieve the effect of low refrigeration temperature

Active Publication Date: 2018-12-28
XIAN CHANGQING TECH ENG
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the invention is to solve the existing natural gas recovery C 3 + The mixed hydrocarbon process technology has problems such as complex process, large number of equipment, and large system pressure drop

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A system and method for recovering heavy hydrocarbons with carbon three or more in natural gas
  • A system and method for recovering heavy hydrocarbons with carbon three or more in natural gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] This embodiment provides a system for recovering heavy hydrocarbons above C3 in natural gas, including cold box I1, propane evaporator I2, deethanizer 3, cold box II4, low temperature separator 5, reboiler 13 and compressor 8. Air cooler 9, water cooler 10, cold box III 7, propane evaporator 11, liquid separator 12;

[0028] The outlet of cold box I1 is connected to the inlet of propane evaporator I2 through pipelines, the outlet of propane evaporator I2 is connected to the middle of deethanizer 3 through pipelines, the inlet end of cold box II4 is connected to the top of deethanizer 3, and the outlet end is connected to low temperature separator 5 are connected by pipelines, the top outlet of the low-temperature separator 5 is connected to the cold box I1 through the pipeline, the bottom outlet is connected to the inlet of the compressor 8 through the pipeline, and the outlet of the compressor 8 is connected to the air cooler 9, the air cooler 9, the water cooler 10, th...

Embodiment 2

[0031] On the basis of Example 1, this example provides a system for recovering heavy hydrocarbons of C3 or more in natural gas, the top outlet of the low-temperature separator 5 is connected to the cold box I1 through a pipeline and the cold box II4.

[0032] The gas phase discharged from the top of the low-temperature separator 5 provides cooling capacity for the cold box II4, and then the gas phase enters the cold box I1 to exchange heat with the raw natural gas.

[0033] A throttle valve 6 is also provided between the bottom outlet of the low-temperature separator 5 and the inlet of the compressor 8, the outlet of the throttle valve 6, the cold box II4, and the cold box III7 are sequentially connected in series, and the outlet of the cold box III7 is connected to the compressor 8 The inlet port is connected.

[0034] The liquid phase discharged from the bottom outlet of the low-temperature separator 5 is depressurized by the throttle valve 6, the temperature drops, and ret...

Embodiment 3

[0037] On the basis of Embodiment 2, this embodiment provides a method for recovering heavy hydrocarbons with carbon three or more in natural gas, comprising the following steps:

[0038] Step 1) The raw natural gas is pre-cooled through the cold box I1 and the propane evaporator I2 in sequence, and then enters the middle part of the deethanizer 3;

[0039] Step 2) The gas phase at the top of the deethanizer 3 enters the cold box II 4 to be cooled to -50°C ~ -70°C, and then enters the low-temperature separator 5 to be divided into two phases of gas and liquid; wherein, the gas phase returns to the cold box II 4 for heat exchange, and the liquid After being depressurized by the throttle valve 6, the phase returns to the cold box II 4 for heat exchange;

[0040] Step 3) The gas phase after the heat exchange in step 2) enters the cold box I1 and then exchanges heat with the raw natural gas;

[0041] Step 4) The liquid phase after the heat exchange in step 2) enters the cold box ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a system and a method for recycling propane and C3<+> hybrid hydrocarbon in natural gas. The system comprises a cold box I, a propane evaporator I, a deethanization tower, a cold box II, a low-temperature separator, a re-boiler as well as a compressor, an air cooler, a water cooler, a cold box III, a propane evaporator II and a liquid separating tank. A refrigerant of the system is obtained from raw material natural gas, and the refrigerant mainly comprises ethane and propane; the refrigerant can achieve a relatively low refrigerating temperature, and also provides a return fluid for the deethanization tower, so an absorbing and separating process for a C3<+> component is integrated in the deethanization tower, and therefore, the C3<+> component can be recycled by only adopting a tower. The system and method have the advantages of being simple in technical process, small in equipment number, small in system pressure drop, and the like.

Description

technical field [0001] The invention belongs to the technical field of natural gas condensate recovery, and in particular relates to a system and method for recovering heavy hydrocarbons with carbon three or more in natural gas. Background technique [0002] In addition to methane, natural gas (including oilfield associated gas) usually contains a certain amount of propane and heavy hydrocarbons above carbon three (referred to as C 3 + mixed hydrocarbons). The main function of the natural gas condensate recovery device is to recover this part of C 3 + Mixed hydrocarbons, so as to obtain high value-added liquid hydrocarbon products. At present, the commonly used natural gas condensate recovery processes include cold oil absorption method, condensation separation method and direct heat exchange method (Direct Heat Exchange, referred to as DHX). Among them, the DHX process was proposed in the 1980s. This process is based on the condensation separation method, and the C 3 ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): F25J3/08
CPCF25J3/0209F25J3/0233F25J3/0242F25J2200/02F25J2200/76F25J2205/02F25J2270/02F25J2270/12F25J2270/60
Inventor 邱鹏王登海郑欣刘子兵薛岗
Owner XIAN CHANGQING TECH ENG
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com