Natural gas molecular sieve adsorption dehydration system provided with heat recycling structure, and method

A technology of natural gas and molecular sieve, which is applied in the direction of gas fuel, petroleum industry, fuel, etc., can solve the problems of waste of heat energy, decrease of adsorption capacity, waste of resources, etc., achieve high-efficiency dehydration operation, reduce heating load, and reduce complexity.

Inactive Publication Date: 2019-07-02
珠海巨涛海洋石油服务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the commonly used molecular sieve dehydration processes are mainly 1+1 scheme (1 tower for adsorption and 1 tower for regeneration) and 2+1 scheme (2 towers for adsorption and 1 tower for regeneration). Non-stop production of natural gas processing units to replace molecular sieves
Since the regeneration of molecular sieve requires high temperature to be fully regenerated, and the molecular sieve regenerated at high temperature needs to be cooled before it can be put into the next round of adsorption operation, the heat generated by cooling the molecular sieve is wasted because it is not recycled.
In addition, the molecular sieve adsorbent has a certain service life. After the service life expires, the molecular sieve will be pulverized and the adsorption capacity will decrease. Therefore,

Method used

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  • Natural gas molecular sieve adsorption dehydration system provided with heat recycling structure, and method
  • Natural gas molecular sieve adsorption dehydration system provided with heat recycling structure, and method

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Experimental program
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Effect test

specific Embodiment 1

[0046] Specific embodiment 1: According to the operation sequence of adjusting the adsorption tower and each switching valve, the alternate switching of adsorption and regeneration can be realized:

[0047] When the two towers of adsorption tower A1 and adsorption tower B2 are adsorbed and dehydrated, the adsorption tower C3 is cold-regenerated, the adsorption tower D4 is hot-regenerated, and the adsorption tower E5 is standby; at this time, the adsorption tower A1 and the adsorption tower B2 are two dehydration towers, and the adsorption tower C3 is Cold regeneration tower and adsorption tower D4 are hot regeneration towers, and adsorption tower E5 is a standby tower;

[0048] Open the valves on the dehydration inlet branch pipe and the dehydration gas outlet branch pipe on the adsorption tower A1 and the adsorption tower B2, and close the valves on the cooling gas inlet branch pipe, the cooling gas outlet branch pipe, the hot gas inlet branch pipe and the hot gas outlet branc...

specific Embodiment 2

[0054] When the two towers of adsorption tower B2 and adsorption tower C3 are adsorbed and dehydrated, the adsorption tower D4 is cold-regenerated, the adsorption tower A1 is hot-regenerated, and the adsorption tower E5 is standby. At this time, the adsorption tower B2 and the adsorption tower C3 are two dehydration towers, and the adsorption tower D4 is Cold regeneration tower and adsorption tower A1 are hot regeneration towers, and adsorption tower E5 is a standby tower;

[0055] Open the valves on the dehydration inlet branch pipe and the dehydration gas outlet branch pipe on the adsorption tower B2 and the adsorption tower C3, and close the valves on the cooling gas inlet branch pipe, the cooling gas outlet branch pipe, the hot gas inlet branch pipe and the hot gas outlet branch pipe;

[0056] Open the valve on the cooling gas inlet branch pipe and the cooling gas outlet branch pipe on the adsorption tower D4, and close the valves on the dehydration inlet branch pipe, the d...

specific Embodiment 3

[0061] When the two towers of adsorption tower C3 and adsorption tower D4 are adsorbed and dehydrated, the adsorption tower A1 is cold regenerated, the adsorption tower B2 is hot regenerated, and the adsorption tower E5 is used for standby; at this time, the adsorption tower C3 and the adsorption tower D4 are two dehydration towers, and the adsorption tower A1 is a cold regeneration tower, adsorption tower B2 is a hot regeneration tower, and adsorption tower E5 is a standby tower;

[0062] Open the valves on the dehydration inlet branch pipe and the dehydration gas outlet branch pipe on the adsorption tower C3 and the adsorption tower D4, and close the valves on the cooling gas inlet branch pipe, the cooling gas outlet branch pipe, the hot gas inlet branch pipe and the hot gas outlet branch pipe;

[0063] Open the valves on the cooling gas inlet branch pipe and the cooling gas outlet branch pipe on the adsorption tower A1, and close the valves on the dehydration inlet branch pi...

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Abstract

The invention discloses a natural gas molecular sieve adsorption dehydration system provided with a heat recycling structure, and a method. The natural gas molecular sieve adsorption dehydration system comprises an adsorption tower assembly composed of a plurality of adsorption towers, a filter, a heater, a heat recycling heat exchanger, an air cooler, a gas-liquid separator, and a compressor; inthe adsorption tower assembly, at least on adsorption tower is taken as a dehydration tower, at least one adsorption tower is taken as a cooling regeneration tower, at least one adsorption tower is taken as a thermal regeneration tower, and at least one adsorption tower is taken as a standby tower; dehydration, cooling regeneration, and thermal regeneration process is realized through cooperationof a switch valve and the adsorption towers, no exhaust gas is discharged, natural gas waste or adoption of other processing equipment is avoided, device operation flexibility and operation reliability are increased, large scale continuous dehydration operation is realized, and the natural gas molecular sieve adsorption dehydration system can be widely used in natural gas dehydration.

Description

technical field [0001] The invention relates to the technical field of natural gas liquefaction, in particular to a natural gas molecular sieve adsorption and dehydration system and method with heat recovery and utilization structure. Background technique [0002] The natural gas liquefaction process is a series of processes in which the raw natural gas from the long-distance pipeline network is pressurized and purified, and then liquefied in a cold box. Before liquefaction, the raw natural gas must be purified and pretreated to remove impurities such as carbon dioxide, hydrogen sulfide, water, mercury, and heavy hydrocarbons contained in the raw natural gas. These substances will freeze at the low temperature used in the liquefaction process and block equipment or reduce the performance of the heat exchanger, usually use triethylene glycol to absorb dehydration to reduce the dew point of natural gas water to 5°C below the ambient temperature, but the depth of triethylene gl...

Claims

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Application Information

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IPC IPC(8): C10L3/10
CPCC10L3/106
Inventor 张清堤马永刚文豪李军辉
Owner 珠海巨涛海洋石油服务有限公司
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