CN203229502U - Device for carrying out dealkylation and dehydration by using differential pressure of inlet and outlet of pipeline - Google Patents
Device for carrying out dealkylation and dehydration by using differential pressure of inlet and outlet of pipeline Download PDFInfo
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- CN203229502U CN203229502U CN 201320112318 CN201320112318U CN203229502U CN 203229502 U CN203229502 U CN 203229502U CN 201320112318 CN201320112318 CN 201320112318 CN 201320112318 U CN201320112318 U CN 201320112318U CN 203229502 U CN203229502 U CN 203229502U
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Abstract
The utility model discloses a device for carrying out dealkylation and dehydration by using a differential pressure of an inlet and an outlet of a pipeline, belonging to the technical field of natural gas fields. The device comprises a plate-fin heat exchanger, a throttling valve and a low-temperature separator, wherein the plate-fin heat exchanger is connected with the throttling valve, a dew point tester and the low-temperature separator by the pipeline, and the other end of the throttling valve is connected with the low-temperature separator through the pipeline. The device has the advantages that the temperature of virgin gas is reduced to be -39.76 DEG C by using pressure energy of the inlet and the outlet of the pipeline through the pressure drop of the virgin gas in the pipeline, and liquid hydrocarbon is separated at the temperature. The rated cold load of a refrigeration unit can be greatly reduced, the equipment investment and the running power consumption are saved, and the economic benefit is remarkable.
Description
Technical field
The utility model relates to a kind of pipeline inlet outlet pressure differential that utilizes and takes off the hydrocarbon dewatering unit, belongs to the natural gas field technical field.
Background technology
Generally speaking, low temperature process is that Sweet natural gas is cooled to a certain low temperature below the hydrocarbon dew point, obtains a part and is rich in liquid hydrocarbon (gas reducing liquid or condensate oil) than heavy hydrocarbons, and make it separated from the gas under this low temperature, so it also claims the condensation separation method.By the refrigeration system difference that cold is provided, low temperature process can be divided into three kinds of swell refrigeration (comprising throttling refrigeration and turbine expander refrigeration), cryogen refrigeration and joint refrigeration methods.
Adopt the low temperature process during except the recovery gas reducing liquid, also Sweet natural gas de-oiling simultaneously (namely take off liquid hydrocarbon or the take off lime set) dehydrations that are used for containing heavy hydrocarbon at present more, make its water, hydrocarbon dew point meet the requirement of marketable natural gas quality index or pipe-line transportation, namely usually said gas dew point is controlled.
Behind the normal employing triglycol dehydration normal temperature delivery technology, Sweet natural gas is directly outer defeated in the gas field.In the gas field and pipeline in service, find that pipeline has lime set to separate out, not only long distance pipeline is caused heavy corrosion, also have a strong impact on calorific value and the outer defeated dew point of Sweet natural gas.
Summary of the invention
In order to overcome the deficiencies in the prior art, the utility model provides a kind of pipeline inlet outlet pressure differential that utilizes to take off the hydrocarbon dewatering unit.
A kind of device that utilizes the pipeline inlet outlet pressure differential to take off the hydrocarbon dehydration comprises plate-fin heat exchanger, throttling valve, low-temperature separator; Plate-fin heat exchanger is by pipe connection throttling valve, dew point testing instrument and low-temperature separator, and the other end of throttling valve is by the pipe connection low-temperature separator.
A kind of pipeline inlet outlet pressure differential that utilizes takes off the hydrocarbon dehydration method, is saving cost, is simplifying under the situation of technology, removes heavy hydrocarbon and reclaims gas reducing liquid; Make its water, hydrocarbon dew point meet pipeline defeated requirement outward, and satisfy the marketable natural gas quality index.
A kind of pipeline inlet outlet pressure differential that utilizes takes off the hydrocarbon dehydration method, contains following steps: by a dingus of being made up of plate-fin heat exchanger, throttling valve and low-temperature separator, raw natural gas produces a little temperature drop inside; As the interchanger cold-end temperature difference, choose enough big heat exchanger area with this temperature drop, make unstripped gas under cold-end temperature difference, produce enough big temperature drop through heat exchange, to satisfy the requirement of natural qi exhaustion hydrocarbon and dehydration;
Unstripped gas minimum temperature can occur when temperature further is reduced to pipe-line transportation, and constantly separate out water of condensation and liquid hydrocarbon in process of cooling through producing Joule-Thomson effect through throttling valve throttling meeting again after the precooling;
In low-temperature separator, cold dry gas (being that water, hydrocarbon dew point meet the gas that pipe-line transportation requires) passes through plate-fin heat exchanger and unstripped gas heat exchange again with after liquid hydrocarbon separates.Dry gas after the re-heat is defeated outward as commodity gas.
Further contain following steps: unstripped gas 1 is given plate-fin heat exchanger 2 by pipe-line transportation, plate-fin heat exchanger 2 outputs first logistics 3, first logistics 3 is given throttling valve 4 by pipe-line transportation, throttling valve 4 outputs second logistics 5, second logistics 5 is given low-temperature separator 7 by pipe-line transportation, low-temperature separator 7 is converted into the 4th logistics 6 and the 3rd logistics 8 outputs with second logistics 5, the 3rd logistics 8 is given plate-fin heat exchanger 2 by pipe-line transportation, plate-fin heat exchanger 2 is converted into outer defeated dry gas 9 with the 3rd logistics 8, outer defeated dry gas 9 is given dew point testing instrument 10 by pipe-line transportation, the outer gas transmission 11 after the 10 output tests of dew point testing instrument.
The utility model has the advantages that by unstripped gas and fall at ducted pressure, utilize the pressure energy of conduit entrance and outlet, the temperature of unstripped gas is cooled to-39.76 ℃, under this temperature, isolate liquid hydrocarbon.
Take off the hydrocarbon device by the set of tubes pressure difference of in the league (unit of length) gas field gas gathering station of Soviet Union of long celebrating oil field, going into operation.
Find through on-the-spot test: this device day processing Sweet natural gas 89 * 10
4m
3, the pressure 4.6～4.8MPa that enters the station, departures pressure 4.1MPa, utilize the pressure difference throttling of Sweet natural gas turnover station 0.5～0.7MPa, make that inlet temperature is 20 ℃ Sweet natural gas, reach-39.76 ℃ low temperature by heat exchange, heavy hydrocarbon and water sepn that the part molecular weight is bigger are come out, and the dry gas re-heat is defeated outward.
This device day is isolated heavy hydrocarbon 1.1m
3, utilize this method and install not only Sweet natural gas outward defeated dew point reach specification of quality, and this Technology can significantly reduce the specified refrigeration duty of unit cooler, saves facility investment and operation power consumption, remarkable in economical benefits.
Description of drawings
When considered in conjunction with the accompanying drawings, by the reference following detailed, can more completely understand the utility model better and learn wherein many attendant advantages easily, but accompanying drawing described herein is used to provide further understanding of the present utility model, constitute a part of the present utility model, illustrative examples of the present utility model and explanation thereof are used for explaining the utility model, do not constitute improper restriction of the present utility model, as figure wherein:
Fig. 1 takes off hydrocarbon dehydration enforcement topology example figure for the pipeline inlet outlet pressure differential that utilizes of the present utility model.
Below in conjunction with drawings and Examples the utility model is further specified.
Embodiment
Obviously, the many modifications and variations done based on aim of the present utility model of those skilled in the art belong to protection domain of the present utility model.
Embodiment 1: as shown in Figure 1, a kind of device that utilizes the pipeline inlet outlet pressure differential to take off the hydrocarbon dehydration comprises plate-fin heat exchanger 2, throttling valve 4, low-temperature separator 7;
Plate-fin heat exchanger 2 is by pipe connection throttling valve 4, dew point testing instrument 10 and low-temperature separator 7, and the other end of throttling valve 4 is by pipe connection low-temperature separator 7.
A kind of pipeline inlet outlet pressure differential that utilizes takes off the hydrocarbon dewatering unit, can save cost, simplify under the situation of technology, removes heavy hydrocarbon and reclaims gas reducing liquid.Make its water, hydrocarbon dew point meet pipeline defeated requirement outward, and satisfy the marketable natural gas quality index.
By a dingus of being made up of plate-fin heat exchanger, throttling valve and low-temperature separator, raw natural gas produces a little temperature drop inside.As the interchanger cold-end temperature difference, choose enough big heat exchanger area with this temperature drop, make unstripped gas under cold-end temperature difference, produce enough big temperature drop through heat exchange, to satisfy the requirement of natural qi exhaustion hydrocarbon and dehydration.
Principle of the present utility model: unstripped gas minimum temperature can occur when temperature further is reduced to pipe-line transportation, and constantly separate out water of condensation and liquid hydrocarbon in process of cooling through producing Joule-Thomson effect through throttling valve throttling meeting again after the precooling.In low-temperature separator, cold dry gas (being that water, hydrocarbon dew point meet the gas that pipe-line transportation requires) passes through plate-fin heat exchanger and unstripped gas heat exchange again with after liquid hydrocarbon separates.Dry gas after the re-heat is defeated outward as commodity gas.
The pipeline inlet outlet pressure differential takes off the hydrocarbon dewatering unit and mainly is made up of plate-type heat exchanger, throttling valve, low-temperature separator.
As shown in Figure 1: after unstripped gas (20 ℃ of temperature, pressure 4.8MPa) entered the plate-fin heat exchanger heat exchange, temperature was-34.5 ℃, enter the throttling valve throttling, logistics after the throttling (temperature-39.76 ℃, pressure 4.1MPa) enters low-temperature separator, isolates heavy hydrocarbon and minor amount of water.Top gas provides cold by plate-fin heat exchanger to unstripped gas, outer defeated dry gas (16.5 ℃ of temperature, pressure 4.09MPa) after the heat exchange, and the dew point of defeated dry gas is-39.77 ℃ under 4.1MPa outside calculating.
By calculating: the thermal load of plate-fin heat exchanger is 1.942 * 10
8Kj/h is about 5.94 * 10
4W is 59.4kW, comes to determine the heat interchanging area of interchanger thus.
Table 1 is long celebrating oil field Soviet Union league (unit of length) gas field gas component table;
The on-the-spot gas component test chart of table 1
(material gas quantity is 7.86 * 10 in the table
4Kgmol/h, pressure are 4.8MPa, and temperature is 20 ℃.）
As shown in Figure 1, raw natural gas 1 comes (20 ℃ of temperature, pressure 4.8MPa) to enter plate-fin heat exchanger 2 from each gas gathering station.
Through the Sweet natural gas after the heat exchange, first logistics, 3 temperature are-34.5 ℃, and pressure is 4.79MPa.
Sweet natural gas continues through throttling valve 4 throttlings, and second logistics, 5 temperature are-39.76 ℃ after the throttling, and pressure is 4.1MPa.
Sweet natural gas after the throttling enters low-temperature separator 7, and under the effect of cyclonic separation, gaseous stream 8 is separated in separator; Isolated gas phase is about 7.86 * 10
4Kgmol/h; Isolated liquid phase is about 0.886kgmol/h.
From the gaseous stream 8 that low-temperature separator is come out, temperature is-39.76 ℃, and pressure is 4.1MPa, enters plate-fin heat exchanger 2 again, provides refrigerating duty to unstripped gas.
Outer defeated dry gas 9 temperature after the heat exchange are 16.5 ℃ and since through the pressure-losses behind the interchanger 0.01MPa, resulting pressure is 4.09MPa; Find that through dew point testing instrument 10 when natural atmospheric pressure was controlled at 4.1MPa, its dew point 11 temperature were-39.77 ℃; That is to say that when temperature was-39.76 ℃ after throttling, its heavy hydrocarbon was separated out fully, defeated gas dew point reaches requirement outward.
In analog calculation, different pressure can be provided, the water dew point under the different pressures will be obtained.
As mentioned above, embodiment of the present utility model is explained, but as long as not breaking away from inventive point of the present utility model and effect in fact can have a lot of distortion, this will be readily apparent to persons skilled in the art.Therefore, such variation also all is included within the protection domain of the present utility model.
Claims (1)
1. a device that utilizes the pipeline inlet outlet pressure differential to take off the hydrocarbon dehydration is characterized in that comprising plate-fin heat exchanger, throttling valve, low-temperature separator; Plate-fin heat exchanger is by pipe connection throttling valve, dew point testing instrument and low-temperature separator, and the other end of throttling valve is by the pipe connection low-temperature separator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320112318 CN203229502U (en) | 2013-03-13 | 2013-03-13 | Device for carrying out dealkylation and dehydration by using differential pressure of inlet and outlet of pipeline |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320112318 CN203229502U (en) | 2013-03-13 | 2013-03-13 | Device for carrying out dealkylation and dehydration by using differential pressure of inlet and outlet of pipeline |
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| Publication Number | Publication Date |
|---|---|
| CN203229502U true CN203229502U (en) | 2013-10-09 |
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ID=49285640
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320112318 Expired - Fee Related CN203229502U (en) | 2013-03-13 | 2013-03-13 | Device for carrying out dealkylation and dehydration by using differential pressure of inlet and outlet of pipeline |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203229502U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104046400A (en) * | 2013-03-13 | 2014-09-17 | 中国石油天然气股份有限公司 | Device and method for carrying out dealkylation and dehydration by using differential pressure of inlet and outlet of pipeline |
| CN106090610A (en) * | 2016-06-23 | 2016-11-09 | 上海电力学院 | The natural gas pipe network pressure energy of a kind of heavy hydrocarbon zero-emission utilizes system |
-
2013
- 2013-03-13 CN CN 201320112318 patent/CN203229502U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104046400A (en) * | 2013-03-13 | 2014-09-17 | 中国石油天然气股份有限公司 | Device and method for carrying out dealkylation and dehydration by using differential pressure of inlet and outlet of pipeline |
| CN104046400B (en) * | 2013-03-13 | 2016-08-03 | 中国石油天然气股份有限公司 | A kind of method and apparatus utilizing pipeline inlet outlet pressure differential to take off hydrocarbon dehydration |
| CN106090610A (en) * | 2016-06-23 | 2016-11-09 | 上海电力学院 | The natural gas pipe network pressure energy of a kind of heavy hydrocarbon zero-emission utilizes system |
| CN106090610B (en) * | 2016-06-23 | 2018-05-22 | 上海电力学院 | A kind of natural gas pipe network pressure energy of heavy hydrocarbon zero-emission utilizes system |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131009 Termination date: 20210313 |
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| CF01 | Termination of patent right due to non-payment of annual fee |