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A method and device for recovering light hydrocarbons from natural gas

A light hydrocarbon recovery and natural gas technology, which is applied in natural gas light hydrocarbon recovery, condensation natural gas light hydrocarbon recovery, and natural gas processing, can solve the problems of low recovery rate of light hydrocarbons, poor applicability of gas sources, single adjustment means, etc., to reduce energy consumption. Low energy consumption, small heat transfer temperature difference, and good application prospects

Active Publication Date: 2018-09-14
CHENGDU SEPMEM SCI & TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0010] The purpose of the present invention is to provide a method and device for recovering light hydrocarbons from natural gas in view of the problems of low recovery rate of light hydrocarbons, low separation precision, single adjustment means, and poor applicability of gas sources existing in the recovery of light hydrocarbons in natural gas

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  • A method and device for recovering light hydrocarbons from natural gas
  • A method and device for recovering light hydrocarbons from natural gas

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Embodiment 1

[0055] The flow chart of this embodiment is as follows figure 1 As shown, the workflow of this embodiment is as follows.

[0056] The raw material gas enters the main heat exchanger 1 for cooling, and the cooled raw gas enters the primary separation tower 2 from the lower part of the primary separation tower 2 . The gas phase (mainly composed of C1 and C2) from the top separator 5 of the deethanizer is cooled by the main heat exchanger 1, and then enters the primary separation tower 2 from the upper part of the primary separation tower 2, and the liquid phase at the top of the tower and the gas phase at the bottom of the tower are in the The countercurrent contact in the primary separation tower 2 washes down the C3+ components in the feed gas.

[0057] The gas phase material rich in C1 and C2 is drawn from the top of the primary separation tower 2, and after being reheated by the main heat exchanger 1, it is exported as a product dry gas; the liquid phase material rich in C3...

Embodiment 2

[0064] The flow chart of this embodiment is as follows figure 2 shown.

[0065] In this embodiment, the main heat exchanger is composed of multiple heat exchangers, and the working process of this embodiment is as follows.

[0066] The raw material gas enters the raw material gas heat exchanger 1 for cooling, and the cooled raw material gas enters the evaporator 2 for further cooling, and then enters the primary separation tower 3 from the lower part of the tower. The gas phase (mainly composed of C1 and C2) from the top separator 8 of the deethanization tower is cooled by the evaporator 2 and the heat exchanger 4 on the top of the primary separation tower in sequence, and enters the primary separation tower 3 from the upper part of the primary separation tower 3. The top liquid phase and the tower bottom gas phase are countercurrently contacted in the primary separation tower 3 to wash off the C3+ components in the raw material gas.

[0067] The gas-phase material rich in ...

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Abstract

The invention discloses a natural gas light hydrocarbon recovery method and device in order to solve the problems that an existing natural gas light hydrocarbon recovery device is low in light hydrocarbon recovery rate, low in separation precision, single in adjustment means and poor in gas source adaptability. The method includes the following steps that raw gas enters a main heat exchanger and enters a primary separation tower after being cooled, a tower top gas phase of the primary separation tower is reheated and used as product dried gas, and a tower bottom liquid phase is conveyed into a deethanizer; a tower top gas phase of the deethanizer is cooled by the main heat exchanger and then subjected to gas-liquid separation, the liquid phase returns to the deethanizer, and the gas phase enters the primary separation tower after further condensation to wash the raw gas; the tower bottom liquid phase of the deethanizer is introduced into the deethanizer; a liquefied petroleum gas product and a condensate oil product are obtained from the tower top and the tower bottom of the deethanizer respectively; cold energy needed in the light hydrocarbon recovery process is provided by a refrigerating system which adopts two-stage throttling refrigeration. The method and device have the advantages that adjustment means are rich, gas source adjustability is high, and energy consumption is low.

Description

technical field [0001] The invention relates to the field of natural gas processing, in particular to the field of recovery of natural gas light hydrocarbons by condensation, and specifically relates to a method and device for recovery of natural gas light hydrocarbons. Background technique [0002] On the one hand, the recovery of light hydrocarbons in natural gas is to control the hydrocarbon dew point of natural gas, so as to achieve the quality index of commercial gas and avoid gas-liquid two-phase flow; on the other hand, the recovered liquid hydrocarbons have great economic value and can be directly used as high-heat value Fuel can also be used as chemical raw material. [0003] At present, light hydrocarbon recovery methods mainly include adsorption method, oil absorption method and condensation separation method. The adsorption method is a method for separating hydrocarbon gases by using the difference in the adsorption capacity of solid adsorbents with porous struc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F25J3/02
CPCF25J3/0209F25J3/0233F25J3/0242F25J3/0247F25J2200/04F25J2200/74F25J2200/78F25J2270/12F25J2270/60F25J2270/90
Inventor 张惊涛母斌
Owner CHENGDU SEPMEM SCI & TECH
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