阅读说明：本技术 一种天然气脱水脱烃集成装置及方法 (Natural gas dehydration and dealkylation integrated device and method ) 是由 王刚 郑春来 涂洁 肖乐 孙润林 郭建 陈运强 刘玉洁 蒋志明 王科 叶虹 冼 于 2020-12-22 设计创作，主要内容包括：本发明属于天然气净化技术领域,具体涉及一种天然气脱水脱烃集成装置及方法。其技术方案为：一种天然气脱水脱烃集成装置,包括湿原料气进入管线和产品气出装置管线,湿原料气进入管线和产品气出装置管线之间连接有三组脱水脱烃单元；所述湿原料气进入管线与脱水脱烃单元的进口之间还连接有分支管线；还包括再生气加热器,三组脱水脱烃单元的出口分别与再生气加热器通过管道连接,再生气加热器的出口管线与脱水脱烃单元连接；还包括冷却分离单元,冷却分离单元分别与三组脱水脱烃单元通过管道连接,冷却分离单元的气相出口管线连接到湿原料气进入管线。本发明提供了一种三组脱水脱烃单元循环进行吸附、冷吹、再生加热的天然气脱水脱烃集成装置及方法。(The invention belongs to the technical field of natural gas purification, and particularly relates to a natural gas dehydration and dealkylation integrated device and method. The technical scheme is as follows: a natural gas dehydration and dealkylation integrated device comprises a wet raw material gas inlet pipeline and a product gas outlet device pipeline, wherein three groups of dehydration and dealkylation units are connected between the wet raw material gas inlet pipeline and the product gas outlet device pipeline; a branch pipeline is connected between the wet raw material gas inlet pipeline and an inlet of the dehydration and dealkylation unit; the system also comprises a regenerated gas heater, the outlets of the three groups of dehydration and dealkylation units are respectively connected with the regenerated gas heater through pipelines, and the outlet pipeline of the regenerated gas heater is connected with the dehydration and dealkylation units; the device also comprises a cooling separation unit, wherein the cooling separation unit is respectively connected with the three groups of dehydration and dealkylation units through pipelines, and a gas phase outlet pipeline of the cooling separation unit is connected to a wet raw material gas inlet pipeline. The invention provides a natural gas dehydration and dealkylation integrated device and a method for circularly performing adsorption, cold blowing and regenerative heating by three groups of dehydration and dealkylation units.)

1. The natural gas dehydration and dealkylation integrated device is characterized by comprising a wet raw material gas inlet pipeline (1) and a product gas outlet device pipeline (16), wherein three groups of dehydration and dealkylation units are connected between the wet raw material gas inlet pipeline (1) and the product gas outlet device pipeline (16), and adsorption program control valves are respectively installed on an inlet pipeline and an outlet pipeline of each dehydration and dealkylation unit; a branch pipeline (3) is connected between the wet raw material gas inlet pipeline (1) and an inlet of the dehydration and dealkylation unit, and a regeneration program control valve is installed on the branch pipeline (3); the device also comprises a regenerated gas heater (10), the outlets of the three groups of dehydration and dealkylation units are respectively connected with the regenerated gas heater (10) through pipelines, a regeneration program control valve is arranged on a pipeline between the dehydration and dealkylation units and the regenerated gas heater (10), and the outlet pipeline of the regenerated gas heater (10) is connected with the dehydration and dealkylation units; the device also comprises a cooling separation unit, the cooling separation unit is respectively connected with the three groups of dehydration and dealkylation units through pipelines, a regeneration program control valve is installed on a pipeline between the cooling separation unit and the dehydration and dealkylation units, and a gas phase outlet pipeline of the cooling separation unit is connected to the wet raw material gas inlet pipeline (1).

2. A natural gas dehydration and dealkylation integrated plant as claimed in claim 1 wherein the dehydration and dealkylation unit comprises a dehydration column, the inlet line of which is connected to the wet feed gas inlet line (1), the outlet line of which is connected to a dealkylation column, the outlet line of which is connected to the product gas outlet plant line (16); the branched pipeline (3) is connected with an inlet of the dehydration tower, an outlet of the dealkylation tower is connected with a regenerated gas heater (10) through a pipeline, an outlet of the regenerated gas heater (10) is respectively connected with an outlet of the dealkylation tower and an outlet of the dehydration tower through a pipeline, and regeneration program control valves are respectively arranged on pipelines between the outlet of the regenerated gas heater (10) and outlets of the dealkylation tower and the dehydration tower; the cooling separation units are divided into two groups, wherein the inlet pipeline of one group of cooling separation units is connected with the inlet of the dealkylation tower, and the inlet pipeline of the other group of cooling separation units is connected with the inlet of the dehydration tower.

3. An integrated natural gas dehydration and dealkylation apparatus according to claim 2, characterized in that a hot regeneration gas flow distribution valve (11) is further installed on the pipeline between the outlet of the regeneration gas heater (10) and the outlet of the dealkylation tower.

4. The integrated natural gas dehydration and hydrocarbon removal device according to claim 2, wherein an adsorption program control valve is installed on a pipeline between the dehydration tower and the hydrocarbon removal tower.

5. The integrated dehydration and hydrocarbon removal device for natural gas as claimed in claim 1, wherein the cooling and separation unit comprises a regeneration gas cooler and a regeneration gas separator which are connected through a pipeline, an inlet pipeline of the regeneration gas cooler is connected with the dehydration and hydrocarbon removal unit, a gas phase outlet pipeline of the regeneration gas separator is connected to the wet raw material gas inlet pipeline (1), and a liquid phase outlet of the regeneration gas separator is connected with the liquid discharge pipe.

6. An integrated natural gas dehydration and hydrocarbon removal plant according to claim 1, characterized in that said wet feed gas inlet line (1) is equipped with a flow control valve (2).

7. A natural gas dehydration and hydrocarbon removal method is characterized by comprising the following steps:

s1: opening adsorption program control valves at an inlet and an outlet of the first group of dehydration and dealkylation units, and closing all regeneration program control valves on the first group of dehydration and dealkylation units; opening a regeneration program control valve on a branch pipeline (3) connected to the second group of dehydration and dealkylation units, a regeneration program control valve on a pipeline between a regeneration gas heater (10) and the outlet of the second group of dehydration and dealkylation units, and closing the regeneration program control valve on the pipeline between the outlet of the regeneration gas heater (10) and the second group of dehydration and dealkylation units, and the regeneration program control valve on a pipeline between the cooling separation unit and the second group of dehydration and dealkylation units; opening a regeneration program control valve on a pipeline between the outlet of the regeneration gas heater (10) and the third group of dehydration and dealkylation units, and a regeneration program control valve on a pipeline between the cooling separation unit and the third group of dehydration and dealkylation units, and closing a regeneration program control valve on a branch pipeline (3) connected to the third group of dehydration and dealkylation units, and a regeneration program control valve on a pipeline between the regeneration gas heater (10) and the outlet of the third group of dehydration and dealkylation units;

s2: after the first group of dehydration and dealkylation units are saturated by adsorption, opening adsorption program control valves at an inlet and an outlet of the second group of dehydration and dealkylation units, and closing all regeneration program control valves on the second group of dehydration and dealkylation units; opening a regeneration program control valve on a branch pipeline (3) connected to the third group of dehydration and dealkylation units, a regeneration program control valve on a pipeline between a regeneration gas heater (10) and an outlet of the third group of dehydration and dealkylation units, and closing the regeneration program control valve on the pipeline between the outlet of the regeneration gas heater (10) and the third group of dehydration and dealkylation units, and the regeneration program control valve on a pipeline between a cooling separation unit and the third group of dehydration and dealkylation units; opening a regeneration program control valve on a pipeline between the outlet of a regeneration gas heater (10) and the first group of dehydration and dealkylation units, and a regeneration program control valve on a pipeline between a cooling separation unit and the first group of dehydration and dealkylation units, and closing a regeneration program control valve on a branch pipeline (3) connected to the first group of dehydration and dealkylation units, and a regeneration program control valve on a pipeline between the regeneration gas heater (10) and the outlet of the first group of dehydration and dealkylation units;

s3: after the second group of dehydration and dealkylation units are saturated in adsorption, opening adsorption program control valves at an inlet and an outlet of the third group of dehydration and dealkylation units, and closing all regeneration program control valves on the third group of dehydration and dealkylation units; opening a regeneration program control valve on a branch pipeline (3) connected to the first group of dehydration and dealkylation units, a regeneration program control valve on a pipeline between a regeneration gas heater (10) and the outlet of the first group of dehydration and dealkylation units, and closing the regeneration program control valve on the pipeline between the outlet of the regeneration gas heater (10) and the first group of dehydration and dealkylation units, and the regeneration program control valve on a pipeline between the cooling separation unit and the first group of dehydration and dealkylation units; opening a regeneration program control valve on a pipeline between the outlet of the regeneration gas heater (10) and the second group of dehydration and dealkylation units, and a regeneration program control valve on a pipeline between the cooling separation unit and the second group of dehydration and dealkylation units, and closing a regeneration program control valve on a branch pipeline (3) connected to the second group of dehydration and dealkylation units, and a regeneration program control valve on a pipeline between the regeneration gas heater (10) and the outlet of the second group of dehydration and dealkylation units; until the third group of dehydration and hydrocarbon removal units are saturated by adsorption;

s4: the loop sequentially goes through steps S1 to S3.

8. A natural gas dehydration and dealkylation method according to claim 7, characterized in that the dehydration and dealkylation unit comprises a dehydration tower, an inlet line of which is connected to the wet feed gas inlet line (1), an outlet line of which is connected to a dealkylation tower, an outlet line of which is connected to the product gas outlet device line (16); an adsorption program control valve is arranged on a pipeline between the dehydration tower and the hydrocarbon removal tower; in step S1, the adsorption program control valve on the line between the dehydration column and the dealkylation column in the first and second groups of dehydration and dealkylation units is opened, and the adsorption program control valve on the line between the dehydration column and the dealkylation column in the third group of dehydration and dealkylation units is closed; in step S2, the adsorption program control valve on the line between the dehydration column and the dealkylation column in the second and third sets of dehydration and dealkylation units is opened, and the adsorption program control valve on the line between the dehydration column and the dealkylation column in the first set of dehydration and dealkylation units is closed; in step S3, the adsorption program control valve on the line between the dehydration column and the dealkylation column in the third group and the first group of dehydration and dealkylation units is opened, and the adsorption program control valve on the line between the dehydration column and the dealkylation column in the second group of dehydration and dealkylation units is closed.

9. The natural gas dehydration and hydrocarbon removal method according to claim 7, wherein the cooling separation unit comprises a regeneration gas cooler and a regeneration gas separator which are connected through a pipeline, an inlet pipeline of the regeneration gas cooler is connected with the dehydration and hydrocarbon removal unit, a gas phase outlet pipeline of the regeneration gas separator is connected to the wet feed gas inlet pipeline (1), and a liquid phase outlet of the regeneration gas separator is connected with the liquid discharge pipe.

10. A process for dehydrating and dealkylating natural gas according to claim 7, characterized in that the wet feed gas inlet line (1) is equipped with a flow control valve (2).

Technical Field

The invention belongs to the technical field of natural gas purification, and particularly relates to a natural gas dehydration and dealkylation integrated device and method.

Background

The gas dehydration method generally includes a membrane separation method, a solid adsorption method, a solvent absorption method, a low temperature method, and the like. Gas dealkylation processes generally include cryogenic processes and solid adsorption processes. The dehydration by the solid adsorption method usually adopts drying agents such as molecular sieves, activated alumina and the like to carry out adsorption dehydration, and the molecular sieves after adsorption are heated by regenerated gas to remove water in the molecular sieves. The solid adsorption method for removing hydrocarbons usually adopts adsorbents such as silica gel and active carbon to carry out adsorption and hydrocarbon removal, and the adsorbed adsorbents are heated by regenerated gas to remove hydrocarbon components.

The scheme of dehydration and dealkylation by solid adsorption method is that a set of dehydration device by solid adsorption method and a set of dealkylation device by solid adsorption method are separately arranged, and a regeneration gas heater, a cooler and a set of program control valve of each device are required to be respectively arranged to regenerate, heat and cool and blow the devices.

Disclosure of Invention

In order to solve the above problems in the prior art, the present invention aims to provide a natural gas dehydration and dealkylation integrated apparatus and method in which three sets of dehydration and dealkylation units perform adsorption, cold blowing, and regeneration heating in a circulating manner, which simplifies the structures of cold blowing and regeneration heating, and enables the adsorption process to be performed continuously.

The technical scheme adopted by the invention is as follows:

a natural gas dehydration and dealkylation integrated device comprises a wet raw material gas inlet pipeline and a product gas outlet device pipeline, wherein three groups of dehydration and dealkylation units are connected between the wet raw material gas inlet pipeline and the product gas outlet device pipeline, and adsorption program control valves are respectively arranged on an inlet pipeline and an outlet pipeline of each dehydration and dealkylation unit; a branch pipeline is connected between the wet raw material gas inlet pipeline and an inlet of the dehydration and dealkylation unit, and a regeneration program control valve is installed on the branch pipeline; the device also comprises a regenerated gas heater, the outlets of the three groups of dehydration and dealkylation units are respectively connected with the regenerated gas heater through pipelines, a regeneration program control valve is arranged on a pipeline between the dehydration and dealkylation unit and the regenerated gas heater, and an outlet pipeline of the regenerated gas heater is connected with the dehydration and dealkylation unit; the device also comprises a cooling separation unit, the cooling separation unit is respectively connected with the three groups of dehydration and dealkylation units through pipelines, a regeneration program control valve is arranged on a pipeline between the cooling separation unit and the dehydration and dealkylation units, and a gas phase outlet pipeline of the cooling separation unit is connected to a wet raw material gas inlet pipeline.

The dehydration and dealkylation unit is a combination of a dehydration tower and a dealkylation tower. In one period, a part of gas in the wet raw material gas inlet pipeline is dehydrated and dealkylated through the first group of dehydration and dealkylation units, and the treated natural gas is discharged to the pipeline passing through the product gas outlet device. And the other part of the gas is used for cold blowing the second group of dehydration and hydrocarbon removal units, cooling the second group of dehydration and hydrocarbon removal units to below 50 ℃, and simultaneously removing water and hydrocarbon in the regeneration gas. And after the cold-blown gas is heated by a regeneration gas heater, the third group of dehydration and dealkylation units are subjected to regeneration heating, so that water and hydrocarbon adsorbed on the third group of dehydration and dealkylation units can be discharged as far as possible. The mixed gas discharged from the third group of dehydration and dealkylation units is cooled by the cooling and separating unit and then is separated, so that liquid-phase water and liquid-phase hydrocarbon in the regenerated gas are separated. The separated gas returns to the wet raw material gas to enter a pipeline and then enters a first group of dehydration and dealkylation units to carry out dehydration and dealkylation.

And after the first group of dehydration and dealkylation units are saturated in adsorption, performing dehydration and dealkylation on the cold-blown second group of dehydration and dealkylation units, performing cold-blowing on the regenerated and heated third group of dehydration and dealkylation units, and performing regeneration and heating on the first group of dehydration and dealkylation units saturated in adsorption. The circulation is carried out, a group of dehydration and dealkylation units are arranged in each period for dehydration and dealkylation, and the continuous operation of the adsorption process is ensured. In the same period, only one group of dehydration and dealkylation units are subjected to cold blowing, and only one group of dehydration and dealkylation units are subjected to regeneration heating, so that the number of regeneration gas heaters and cooling and separating units can be reduced, and the structure of the device is correspondingly simplified.

As a preferred embodiment of the present invention, the dehydration and dealkylation unit comprises a dehydration tower, an inlet pipeline of the dehydration tower is connected to the wet raw material gas inlet pipeline, an outlet pipeline of the dehydration tower is connected to a dealkylation tower, and an outlet pipeline of the dealkylation tower is connected to a product gas outlet device pipeline; the branched pipeline is connected with an inlet of the dehydrating tower, an outlet of the dealkylating tower is connected with the regenerated gas heater through a pipeline, an outlet of the regenerated gas heater is respectively connected with an outlet of the dealkylating tower and an outlet of the dehydrating tower through a pipeline, and regeneration program control valves are respectively arranged on pipelines between the outlet of the regenerated gas heater and the outlets of the dealkylating tower and the dehydrating tower; the cooling separation units are divided into two groups, wherein the inlet pipeline of one group of cooling separation units is connected with the inlet of the dealkylation tower, and the inlet pipeline of the other group of cooling separation units is connected with the inlet of the dehydration tower. The dehydrating tower can adsorb moisture in the gas, and the hydrocarbon removing tower can adsorb hydrocarbon in the gas. The time of one cycle is determined according to the properties of the product. The different dehydration and de-hydrocarbon times for a gas can be balanced by increasing the volume of the column with a longer adsorption time, but is limited to gases with comparable dehydration and de-hydrocarbon times.

In a preferred embodiment of the present invention, a hot regeneration gas flow distribution valve is further installed on a pipeline between the outlet of the regeneration gas heater and the outlet of the dealkylation tower. The thermal regeneration gas flow distribution valve can control the amounts of the regeneration gas entering the dealkylation tower and the regeneration gas entering the dehydration tower, and ensures that both the dealkylation tower and the dehydration tower can be fully regenerated and heated.

In a preferred embodiment of the present invention, an adsorption process control valve is installed in a line between the dehydration column and the hydrocarbon removal column. When the dehydration and dealkylation unit carries out adsorption or cold blowing, an adsorption program control valve between the dehydration tower and the dealkylation tower is opened, and gas can enter the dealkylation tower from the dehydration tower. When the dehydration and dealkylation unit carries out regeneration heating, the adsorption program control valve between the dehydration tower and the dealkylation tower is closed, so that gas heated by the regeneration gas heater can enter the dehydration tower and the dealkylation tower respectively in two ways, water or hydrocarbon discharged from the dehydration tower and the dealkylation tower can be separated by the corresponding cooling and separating units, and the water or hydrocarbon discharged from the dehydration tower and the dealkylation tower is prevented from returning to a raw material gas inlet pipeline. And the regeneration gas enters from the outlets of the dehydrating tower and the dealkylation tower respectively, and regenerates and heats the dehydrating tower and the dealkylation tower in the reverse direction.

As a preferable scheme of the invention, the cooling separation unit comprises a regeneration gas cooler and a regeneration gas separator which are connected through a pipeline, an inlet pipeline of the regeneration gas cooler is connected with the dehydration and dealkylation unit, a gas phase outlet pipeline of the regeneration gas separator is connected to a wet raw material gas inlet pipeline, and a liquid phase outlet of the regeneration gas separator is connected with a liquid discharge pipe. The cooler cools the gas and then the gas is subjected to regeneration gas separation for gas-liquid separation, so that the water and the hydrocarbon which are separated in the invention are finally discharged.

In a preferred embodiment of the present invention, a flow control valve is installed on the wet feed gas inlet line. The flow control valve can control the gas quantity entering the dehydration and dealkylation unit of the adsorption procedure and the gas quantity entering the dehydration and dealkylation unit of the cold blowing procedure, and the gas can be ensured to carry out thorough cold blowing and regenerative heating on the corresponding dehydration and dealkylation unit.

A natural gas dehydration and dealkylation method, comprising the following steps:

s1: opening adsorption program control valves at an inlet and an outlet of the first group of dehydration and dealkylation units, and closing all regeneration program control valves on the first group of dehydration and dealkylation units; opening a regeneration program control valve on a branch pipeline connected to the second group of dehydration and dealkylation units, a regeneration program control valve on a pipeline between a regeneration gas heater and the outlet of the second group of dehydration and dealkylation units, and closing the regeneration program control valve on the pipeline between the outlet of the regeneration gas heater and the second group of dehydration and dealkylation units, and a regeneration program control valve on a pipeline between a cooling separation unit and the second group of dehydration and dealkylation units; opening a regeneration program control valve on a pipeline between an outlet of the regeneration gas heater and the third group of dehydration and dealkylation units, and a regeneration program control valve on a pipeline between the cooling separation unit and the third group of dehydration and dealkylation units, and closing a regeneration program control valve on a branch pipeline connected to the third group of dehydration and dealkylation units, and a regeneration program control valve on a pipeline between the regeneration gas heater and an outlet of the third group of dehydration and dealkylation units;

s2: after the first group of dehydration and dealkylation units are saturated by adsorption, opening adsorption program control valves at an inlet and an outlet of the second group of dehydration and dealkylation units, and closing all regeneration program control valves on the second group of dehydration and dealkylation units; opening a regeneration program control valve on a branch pipeline connected to the third group of dehydration and dealkylation units, a regeneration program control valve on a pipeline between the regeneration gas heater and the outlet of the third group of dehydration and dealkylation units, and closing the regeneration program control valve on the pipeline between the outlet of the regeneration gas heater and the third group of dehydration and dealkylation units, and a regeneration program control valve on a pipeline between the cooling separation unit and the third group of dehydration and dealkylation units; opening a regeneration program control valve on a pipeline between an outlet of a regeneration gas heater and the first group of dehydration and dealkylation units, opening a regeneration program control valve on a pipeline between a cooling separation unit and the first group of dehydration and dealkylation units, and closing a regeneration program control valve on a branch pipeline connected to the first group of dehydration and dealkylation units, and opening a regeneration program control valve on a pipeline between the regeneration gas heater and an outlet of the first group of dehydration and dealkylation units;

s3: after the second group of dehydration and dealkylation units are saturated in adsorption, opening adsorption program control valves at an inlet and an outlet of the third group of dehydration and dealkylation units, and closing all regeneration program control valves on the third group of dehydration and dealkylation units; opening a regeneration program control valve on a branch pipeline connected with the first group of dehydration and dealkylation units, a regeneration program control valve on a pipeline between a regeneration gas heater and an outlet of the first group of dehydration and dealkylation units, and closing the regeneration program control valve on the pipeline between the outlet of the regeneration gas heater and the first group of dehydration and dealkylation units, and a regeneration program control valve on a pipeline between a cooling separation unit and the first group of dehydration and dealkylation units; opening a regeneration program control valve on a pipeline between the outlet of the regeneration gas heater and the second group of dehydration and dealkylation units, and a regeneration program control valve on a pipeline between the cooling separation unit and the second group of dehydration and dealkylation units, and closing a regeneration program control valve on a branch pipeline connected to the second group of dehydration and dealkylation units, and a regeneration program control valve on a pipeline between the regeneration gas heater and the outlet of the second group of dehydration and dealkylation units; until the third group of dehydration and hydrocarbon removal units are saturated by adsorption;

s4: the loop sequentially goes through steps S1 to S3.

As a preferred embodiment of the present invention, the dehydration and dealkylation unit comprises a dehydration tower, an inlet pipeline of the dehydration tower is connected to the wet raw material gas inlet pipeline, an outlet pipeline of the dehydration tower is connected to a dealkylation tower, and an outlet pipeline of the dealkylation tower is connected to a product gas outlet device pipeline; an adsorption program control valve is arranged on a pipeline between the dehydration tower and the hydrocarbon removal tower; in step S1, the adsorption program control valve on the line between the dehydration column and the dealkylation column in the first and second groups of dehydration and dealkylation units is opened, and the adsorption program control valve on the line between the dehydration column and the dealkylation column in the third group of dehydration and dealkylation units is closed; in step S2, the adsorption program control valve on the line between the dehydration column and the dealkylation column in the second and third sets of dehydration and dealkylation units is opened, and the adsorption program control valve on the line between the dehydration column and the dealkylation column in the first set of dehydration and dealkylation units is closed; in step S3, the adsorption program control valve on the line between the dehydration column and the dealkylation column in the third group and the first group of dehydration and dealkylation units is opened, and the adsorption program control valve on the line between the dehydration column and the dealkylation column in the second group of dehydration and dealkylation units is closed.

As a preferable scheme of the invention, the cooling separation unit comprises a regeneration gas cooler and a regeneration gas separator which are connected through a pipeline, an inlet pipeline of the regeneration gas cooler is connected with the dehydration and dealkylation unit, a gas phase outlet pipeline of the regeneration gas separator is connected to a wet raw material gas inlet pipeline, and a liquid phase outlet of the regeneration gas separator is connected with a liquid discharge pipe.

In a preferred embodiment of the present invention, a flow control valve is installed on the wet feed gas inlet line.

The invention has the beneficial effects that:

1. three groups of dehydration and dealkylation units circularly and sequentially perform dehydration and dealkylation, cold blowing and regenerative heating, and one group of dehydration and dealkylation units performs dehydration and dealkylation in each period, so that the continuous performance of an adsorption process is ensured.

2. In the same period, only one group of dehydration and dealkylation units are subjected to cold blowing, and only one group of dehydration and dealkylation units are subjected to regeneration heating, so that the number of regeneration gas heaters and cooling and separating units can be reduced, and the structure of the device is correspondingly simplified.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic diagram of the configuration of the present invention when a first set of dehydration and dealkylation units are used for adsorption;

FIG. 3 is a schematic diagram of the present invention configuration when a second set of dehydration and dealkylation units are used for adsorption;

FIG. 4 is a schematic diagram of the present invention configuration when a third set of dehydration and dealkylation units is used for adsorption; .

In the figure, 1-wet feed gas enters the pipeline; 2-a flow control valve; 3-a branch line; 4-a first dehydration column; 5-a second dehydration column; 6-a third dehydration column; 7-a first de-hydrocarbonation column; 8-a second de-hydrocarbonation column; 9-a third de-hydrocarbonation column; 10-a regeneration gas heater; 11-thermal regeneration gas flow distribution valve; 12-a hydrocarbon-containing regeneration gas cooler; 13-aqueous regeneration gas cooler; 14-a hydrocarbon-containing regenerator gas separator; 15-moisture regeneration gas separator; 16-product gas outlet means line; KV-1A, KV-1B, KV-1C, KV-2A, KV-2B, KV-2C, KV-3A, KV-3B, KV-3C is an adsorption program control valve; KV-4A, KV-4B, KV-4C, KV-5A, KV-5B, KV-5C, KV6A, KV-6B, KV-6C, KV-7A, KV-7B, KV-7C, KV-8A, KV-8B, KV-8C, KV-9A, KV-9B, KV-9C are regeneration program control valves.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

As shown in fig. 1, the integrated natural gas dehydration and dealkylation apparatus of the present embodiment is used for natural gas dehydration and dealkylation. The natural gas dehydration and dealkylation integrated device of the embodiment comprises a set of dehydration towers, a set of dealkylation towers, a regeneration gas heater 10, a hydrocarbon-containing regeneration gas cooler 12, a water-containing regeneration gas cooler 13, a hydrocarbon-containing regeneration gas separator 14 and a water-containing regeneration gas separator 15. The set of dehydration towers comprises a first dehydration tower 4, a second dehydration tower 5 and a third dehydration tower 6, and the set of dehydrocarbon towers comprises a first dehydrocarbon tower 7, a second dehydrocarbon tower 8 and a third dehydrocarbon tower 9; the wet raw material gas inlet pipeline 1 from the upstream is communicated with a branch pipeline 3, a flow control valve 2 is arranged on the wet raw material gas inlet pipeline 1, and the flow control valve 2 can play the roles of controlling the flow and reducing the pressure. A hot regeneration gas flow distributing valve 11 is arranged on a pipeline from the outlet of the regeneration gas heater 10 to the dealkylation tower, and the hot regeneration gas flow distributing valve 11 can play a role of distributing the regeneration gas flow.

The tops of the first dehydrating tower 4, the second dehydrating tower 5 and the third dehydrating tower 6 are respectively communicated with a wet raw material gas inlet pipeline 1, a branch pipeline 3 and a water-containing regeneration gas cooler 13, and adsorption program control valves KV-1A, KV-1B and KV-1C are respectively arranged on pipelines of the wet raw material gas inlet pipeline 1 communicated with the first dehydrating tower 4, the second dehydrating tower 5 and the third dehydrating tower 6. And regeneration program control valves KV-4A, KV-4B and KV-4C are respectively arranged on pipelines of the branch pipeline 3 communicated with the tops of the first dehydrating tower 4, the second dehydrating tower 5 and the third dehydrating tower 6. And regeneration program control valves KV-9A, KV-9B and KV-9C are respectively arranged on pipelines communicated with the top of the first dehydrating tower 4, the second dehydrating tower 5 and the third dehydrating tower 6 through an inlet pipeline of the water-containing regeneration gas cooler 13.

The bottoms of the first dehydrating tower 4, the second dehydrating tower 5 and the third dehydrating tower 6 are respectively communicated with the tops of the first dealkylating tower 7, the second dealkylating tower 8 and the third dealkylating tower 9, and adsorption program control valves KV-2A, KV-2B and KV-2C are respectively arranged on communicated pipelines. The bottoms of the first dehydration tower 4, the second dehydration tower 5 and the third dehydration tower 6 are communicated with an outlet pipeline of a regeneration gas heater 10, and regeneration program control valves KV-7A, KV-7B and KV-7C are respectively arranged on the communicated pipelines.

The tops of the first dealkylation tower 7, the second dealkylation tower 8 and the third dealkylation tower 9 are respectively communicated with the inlet of the hydrocarbon-containing regeneration gas cooler 12, and regeneration program control valves KV-8A, KV-8B and KV-8C are respectively arranged on the communicated pipelines.

The bottoms of the first dealkylation tower 7, the second dealkylation tower 8 and the third dealkylation tower 9 are respectively communicated with a product gas outlet device pipeline 16, a hot regeneration gas flow distribution valve 11 and a regeneration gas heater 10. Adsorption program control valves KV-3A, KV-3B and KV-3C are respectively arranged on pipelines which are communicated with a product gas outlet device pipeline 16 at the bottoms of the first dealkylation tower 7, the second dealkylation tower 8 and the third dealkylation tower 9; regeneration program control valves KV-5A, KV-5B and KV-5C are respectively arranged on pipelines at the bottoms of the first dealkylation tower 7, the second dealkylation tower 8 and the third dealkylation tower 9, which are communicated with the regeneration gas heater 10; regeneration program control valves KV-6A, KV-6B and KV-6C are respectively arranged on pipelines at the bottoms of the first dealkylation tower 7, the second dealkylation tower 8 and the third dealkylation tower 9, which are communicated with the thermal regeneration gas flow distribution valve 11.

The outlet of the regenerated gas heater 10 is respectively communicated with a regeneration program control valve KV-7A, KV-7B, KV-7C and a thermal regenerated gas flow distribution valve 11.

The outlet of the hydrocarbon-containing regeneration gas cooler 12 is communicated with the inlet of the hydrocarbon-containing regeneration gas separator 14; the outlet of the hydrous regeneration gas cooler 13 is communicated with the inlet of the hydrous regeneration gas separator 15. The outlet of the hydrocarbon-containing regeneration gas separator 14 is respectively communicated with the outlet of the aqueous regeneration gas separator 15 and the downstream of the flow control valve 2.

The first dehydrating tower 4 and the first dealkylating tower 7, the second dehydrating tower 5 and the second dealkylating tower 8, and the third dehydrating tower 6 and the third dealkylating tower 9 of the dehydration and dealkylation device provided by the invention can respectively carry out adsorption, cold blowing and heating processes in the same period.

The specific process is as follows:

when one dehydrating tower and one hydrocarbon removing tower carry out the processes of adsorption dehydration and hydrocarbon removal, the adsorption program control valve group of the dehydrating tower and the hydrocarbon removing tower is opened, and the connected regeneration program control valve group is closed. As shown in FIG. 2, taking the case where the first dehydrating tower 4 and the first dealkylating tower 7 adsorb, the second dehydrating tower 5 and the second dealkylating tower 8 cool blow, and the third dehydrating tower 6 and the third dealkylating tower 9 regenerate and heat, the adsorption program control valves KV-1A, KV-2A and KV-3A of the first dehydrating tower 4 and the first dealkylating tower 7 are in an on state, and KV-4A, KV-5A, KV-6A, KV-7A, KV-8A and KV-9A are in an off state. Wet raw material gas enters a pipeline 1 and an adsorption program control valve KV-1A through the wet raw material gas, enters a dehydrating tower I4, is subjected to adsorption dehydration in the tower, dehydrated dry gas enters a first dealkylation tower 7 through an adsorption program control valve KV-2A, is subjected to adsorption dealkylation in the tower, and dealkylated product gas enters a product gas outlet device pipeline 16 through an adsorption program control valve KV-3A and is led to the downstream. When the first dehydrating tower 4 and the first dealkylating tower 7 are used for adsorption, the second dehydrating tower 5 and the second dealkylating tower 8 are in a cold blowing stage, the adsorption program control valves KV-1B and KV-3B are in a closed state, the regeneration program control valves KV-6B, KV-7B, KV-8B and KV-9B are also in a closed state, and the adsorption program control valve KV-2B and the regeneration program control valve KV-4B, KV-5B are in an open state.

And (3) allowing about 15-25% of wet raw material gas to pass through a branch pipeline 3, passing through a regeneration program control valve KV-4B, entering a second dehydration tower 5 for cold blowing, passing through an adsorption program control valve KV-2B, entering a second dealkylation tower 8 for cold blowing, and then entering a regeneration gas heater 10 for heating and temperature rise through a regeneration program control valve KV-5B. At this time, the third dehydrating tower 6 and the third dealkylating tower 9 are in the regeneration heating stage, the adsorption program control valves KV-1C, KV-2C and KV-3C are in the closed state, the regeneration program control valves KV-4C and KV-5C are also in the closed state, and the regeneration program control valves KV-6C, KV-7C, KV-8C and KV-9C are in the open state.

The regenerated gas heated by the regenerated gas heater 10 is divided into two paths, and one path of the regenerated gas passes through the hot regenerated gas flow distribution valve 11 and then enters the third dealkylation tower 9 from the bottom through the regeneration program control valve KV-6C, so that the third dealkylation tower 9 is heated in a regeneration mode. The hydrocarbon-containing regeneration gas which finishes the process of the hydrocarbon-removing regeneration enters a hydrocarbon-containing regeneration gas cooler 12 through a regeneration program control valve KV-8C for cooling, the hydrocarbon-containing regeneration gas after cooling enters a hydrocarbon-containing regeneration gas separator 14 for gas-liquid separation, a gas phase in the hydrocarbon-containing regeneration gas separator 14 is merged into wet raw material gas through a gas phase outlet pipeline of the hydrocarbon-containing regeneration gas separator and a gas phase outlet pipeline of a water-containing regeneration gas separator 15 and enters a pipeline 1, and the wet raw material gas is merged with wet raw material gas to be adsorbed in a dehydrating tower I4 for the process of adsorption, then enters a dehydrating tower I4 through an adsorption program control valve KV-1A, and is subjected.

And the other path of the heated regeneration gas enters the third dehydration tower 6 from the bottom through a regeneration program control valve KV-7C, so that the third dehydration tower 6 is subjected to regeneration heating. The water-containing regeneration gas which finishes the dehydration regeneration process enters a water-containing regeneration gas cooler 13 for cooling through a regeneration program control valve KV-9C, the cooled water-containing regeneration gas enters a water-containing regeneration gas separator 15 for gas-liquid separation, the gas phase in the water-containing regeneration gas separator 15 is converged into wet feed gas through a water-containing regeneration gas separator gas phase outlet pipeline and a hydrocarbon-containing regeneration gas separator 14 gas phase outlet pipeline together and enters a pipeline 1, the gas is converged with wet raw gas to be adsorbed in a dehydrating tower I4 for the adsorption process, enters a dehydrating tower I4 through an adsorption program control valve KV-1A for adsorption dehydration, the dehydrated dry gas enters a first dealkylation tower 7 through an adsorption program control valve KV-2A, the adsorption and the hydrocarbon removal are carried out in the tower, and the product gas after the hydrocarbon removal enters a product gas outlet device pipeline 16 through an adsorption program control valve KV-3A and is led to the downstream.

In the dehydration/dealkylation apparatus of the present invention, the first dehydration column 4 and the first dealkylation column 7, the second dehydration column 5 and the second dealkylation column 8, and the third dehydration column 6 and the third dealkylation column 9 are sequentially switched according to adsorption, cold blowing, and regenerative heating. Each group of the towers circulates according to the sequence of adsorption, regenerative heating, cold blowing and adsorption.

As shown in fig. 2, in the first cycle, the first dehydrating tower 4 and the first dealkylating tower 7 perform an adsorption process, while the second dehydrating tower 5 and the second dealkylating tower 8 perform a cold blowing process, and the third dehydrating tower 6 and the third dealkylating tower 9 perform a regeneration heating process.

As shown in fig. 3, in the next cycle, the first dehydrating tower 4 and the first dealkylating tower 7 are switched from the adsorption process to the regeneration heating process, at which time the adsorption process control valves KV-1A, KV-2A and KV-3A are switched to the off state and the regeneration process control valves KV-6A, KV-7A, KV-8A and KV-9A are switched to the on state. And the second dehydrating tower 5 and the second dealkylating tower 8 which are subjected to cold blowing are switched to an adsorption dehydration dealkylating process from the cold blowing process, at the moment, the regeneration program control valves KV-4B and KV-5B are switched to a closed state, and the adsorption program control valves KV-1B and KV-3B are switched to an open state. The third dehydrating tower 6 and the third hydrocarbon removing tower 9 are switched from the regeneration heating process to the cold blowing process, at this time, the regeneration program control valves KV-6C, KV-7C, KV-8C and KV-9C are switched to a closed state, the adsorption program control valve KV-2C is switched to an open state, and the regeneration program control valves KV-4C and KV-5C are switched to an open state.

As shown in fig. 4, when the 3 rd cycle is entered, the first dehydrating tower 4 and the first hydrocarbon-removing tower 7 are switched from the regeneration heating process to the cold blowing process, at which time the regeneration program control valves KV-6A, KV-7A, KV-8A and KV-9A are switched to the off state, the adsorption program control valve KV-2A is switched to the on state, and the regeneration program control valves KV-4C and KV-5C are switched to the on state. The second dehydrating tower 5 and the second hydrocarbon removing tower 8 are switched from the adsorption process to the regeneration heating process, at this time, the adsorption program control valves KV-1B, KV-2B and KV-3B are switched to a closed state, and the regeneration program control valves KV-6B, KV-7B, KV-8B and KV-9B are switched to an open state. And the third dehydrating tower 6 and the third dealkylating tower 9 which are subjected to cold blowing are switched to an adsorption dehydration dealkylating process from the cold blowing process, at the moment, the regeneration program control valves KV-4C and KV-5C are switched to a closed state, and the adsorption program control valves KV-1C and KV-3C are switched to an open state.

And then cycling according to the above process.

The invention is not limited to the above alternative embodiments, and any other various forms of products can be obtained by anyone in the light of the present invention, but any changes in shape or structure thereof, which fall within the scope of the present invention as defined in the claims, fall within the scope of the present invention.