Method for removing heavy hydrocarbon in natural gas through low-temperature capillary condensation

A technology of capillary condensation and natural gas, which is applied in the direction of gas fuel, petroleum industry, fuel, etc., can solve the problems of freezing of cold boxes, impossible to achieve removal concentration, etc., and achieve the effect of continuous operation, easy operation and stable operation

Active Publication Date: 2014-01-08
CHONGQING ENDURANCE IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Easy to freeze freezer
However, the vapor pressure of these substances is relatively high, therefore, it is basicall

Method used

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  • Method for removing heavy hydrocarbon in natural gas through low-temperature capillary condensation
  • Method for removing heavy hydrocarbon in natural gas through low-temperature capillary condensation
  • Method for removing heavy hydrocarbon in natural gas through low-temperature capillary condensation

Examples

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Effect test

Embodiment 1

[0032] Such as figure 1 As shown, this process adopts a two-tower low-temperature capillary condensation process for removing heavy hydrocarbons. The structure of the tower of the present invention is the same as that of the adsorption towers currently on the market. The first column 2 and the second column 3 are arranged in parallel and operated out of phase. The capillary porous material filled in the first tower 2 and the second tower 3 is coconut shell activated carbon, the apparent diameter is 3mm, the pore diameter is 7.8nm-15000nm, the concentration is distributed at 108nm, and the specific surface area is 1030m 2 / g, bulk density 0.43g / cm 3 , fully dry before use.

[0033] The raw natural gas is pre-cooled through the first heat exchanger 1, and the pre-cooling temperature is 6.5°C. The pre-cooled low-temperature feed gas enters the first tower 2 from the upper part of the first tower 2, heavy hydrocarbons (hydrocarbons with more than 5 carbon atoms) are enriched a...

Embodiment 2

[0041] as attached figure 2 As shown, this process adopts a three-tower low-temperature capillary condensation process. The first, second and third towers 2, 3 and 6 are arranged in parallel and operated in different phases. The capillary porous materials filled in the first, second and third towers 2, 3, and 6 are all silica gel, which is columnar particles with a diameter of 2.5mm, a pore diameter of 8.5-38nm, concentrated distribution at 22nm, and a specific surface area of ​​350m 2 / g, bulk density 0.75g / cm 3 , fully dry before use.

[0042] The raw natural gas is pre-cooled through the first heat exchanger 1, and the pre-cooling temperature is 5.5°C. Pre-cooled low-temperature capillary condensation of low-temperature raw gas to remove heavy hydrocarbons. Initially, the first tower 2 is in the state of cooling after regeneration, while the second tower is already in the middle of the low-temperature capillary condensation process, and the third tower 6 is in the low-t...

Embodiment 3

[0049] Such as figure 1 As shown, this process adopts a two-tower low-temperature capillary condensation process for removing heavy hydrocarbons. The first column 2 and the second column 3 are arranged in parallel and operated out of phase. The capillary porous material filled in the first tower 2 and the second tower 3 adopts mesoporous molecular sieve MCM-41, with an apparent diameter of 3mm, a pore diameter of 15nm, and a specific surface area of ​​985m 2 / g, bulk density 0.68g / cm 3 , fully dry before use.

[0050] The raw natural gas is pre-cooled through the first heat exchanger 1, and the pre-cooling temperature is 5.8°C. The pre-cooled low-temperature feed gas enters the first tower 2 from the upper part of the first tower 2, heavy hydrocarbons (hydrocarbons with more than 5 carbon atoms) are enriched and condensed in the bed layer, and the purified product gas flows from the first tower 2 The lower part flows out. The operating pressure of the first column 2 is 2M...

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Abstract

The invention discloses a method for removing heavy hydrocarbon in natural gas through low-temperature capillary condensation, which is characterized by comprising the following steps: (1) precooling the raw natural gas through a first heat exchanger, wherein the precooling temperature is 5.5-(-15.5) DEG C; and at the temperature, the heavy hydrocarbon in the raw natural gas does not condense; and (2) feeding the precooled low-temperature raw gas into a tower filled with a capillary porous material, wherein the operation pressure in the tower is 2-8MPa, the heavy hydrocarbon is condensed in the inner bores of the capillary porous material, and the product gas flows out from the lower part of the tower. The method disclosed by the invention is suitable for the natural gas which contains a volatile component with a high condensation point and is improper for cryogenic cooling to remove heavy hydrocarbon, and is also suitable for the raw gas of a common liquefaction plant of common natural gas with exceeding heavy hydrocarbon content. The raw natural gas after the heavy hydrocarbon removal meets the requirement of natural gas liquefaction on the heavy hydrocarbon content of the raw natural gas.

Description

technical field [0001] The invention relates to a method for removing impurities in natural gas, in particular to a method for pretreatment before liquefaction of natural gas, and a method for removing heavy hydrocarbons in natural gas through low-temperature capillary condensation. Background technique [0002] Natural gas is a kind of clean energy, which has the characteristics of high calorific value, high combustion efficiency, and less pollution after combustion. With the improvement of urban pipeline network construction, the use of pipeline natural gas is becoming more and more extensive. Since natural gas fields are generally not in the same region as gas demand, and some are even transnational, and the use of natural gas has a time period and seasonality, therefore, liquefied natural gas for the purpose of natural gas transportation and to solve the timeliness of natural gas has become an important means . With the expansion of LNG users to the transportation indu...

Claims

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Application Information

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IPC IPC(8): C10L3/10
Inventor 张金桥魏江涛曾桃陈昌禄
Owner CHONGQING ENDURANCE IND
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