CN204240706U - A kind of natural gas liquefaction system and knot screen thereof - Google Patents
A kind of natural gas liquefaction system and knot screen thereof Download PDFInfo
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- CN204240706U CN204240706U CN201420564825.1U CN201420564825U CN204240706U CN 204240706 U CN204240706 U CN 204240706U CN 201420564825 U CN201420564825 U CN 201420564825U CN 204240706 U CN204240706 U CN 204240706U
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Abstract
The utility model discloses a kind of knot screen of natural gas liquefaction system, comprise removal of impurities pipeline, one end of this removal of impurities pipeline is communicated in the outlet of first order compressor, and the other end of this removal of impurities pipeline is communicated in the entrance of cold box system.Visible, this programme adopts the existing high pressure of first order compressor outlet, the natural gas of high temperature purges cold box system, and purging speed is fast, pressure is high, temperature is high, drastically increases dust removal rate.This programme does not need to purchase equipment in addition, simplifies process system, saves system cost, thus brings direct economic benefit for owner.The invention also discloses a kind of natural gas liquefaction system comprising above-mentioned knot screen.
Description
Technical field
The utility model relates to derived energy chemical technical field, particularly relates to a kind of natural gas liquefaction system and knot screen thereof.
Background technology
At present, in the liquefaction process of natural gas, first raw natural gas is processed through pretreatment and compression, high pressure after overcompression process, swiftly flowing natural gas enter cold box system by valve with certain flow, then in cold box system through precooling, expand the cooling such as cooling, throttling liquefaction process, the LNG (liquefied natural gas) of final acquisition-142 DEG C.
Concrete, compressor treatment system of the prior art is provided with three-stage blower, and existing cold box system comprises the First Heat Exchanger, freon heat exchanger, the second heat exchanger, high-pressure ejector, the first separator and the second separator that set gradually.
The detailed process of the liquefaction of above-mentioned natural gas is: from well natural gas out with the pressure of about 2.3MPa, with certain flow through CO
2purification level and H
2o dry stage, and supercharging in the compressor of logistics that is liquefied, 20MPa after three stage compression, the high-pressure natural gas of 40 DEG C enter cold box system, then after two-stage heat exchanger and the heat exchange of freon heat exchanger ,-37 DEG C are cooled to, and enter high-pressure ejector with the pressure of 19.8 ~ 19.9MPa, finally formed the LNG of-142 DEG C after high-pressure ejector swell refrigeration, and Pressure Drop is to 1.2MPa.First separator and the second separator are for separating of liquid and gas, and its operating pressure is respectively about 1.2MPa and 0.4MPa.
But existing natural gas liquefaction process exists following shortcoming: on the one hand, containing a small amount of heavy hydrocarbon in the LNG product produced after high-pressure spray, cumulative in the storage tank of heavy hydrocarbon in cold box system and pipeline; On the other hand, unstripped gas natural gas after pretreatment and compressor process is entrained with a small amount of impurity of part, be mixed in after high-pressure spray in heavy hydrocarbon and be attached on storage tank and duct wall together, the heavy hydrocarbon of these accumulation and impurity easily cause the frozen block of cold box system in long systemic circulation.
In order to overcome above-mentioned shortcoming, prior art adopts electric heater to carry out heating raw natural gas, and the natural gas of heat is circulated by cold box system, the heavy hydrocarbon of low temperature frozen block and impurity re-heat, heats up, blows stifled, thus reach the object of despumation.
There is following shortcoming in the method for existing despumation: 1, raw natural gas pressure is low, and purge slowly, efficiency is extremely low, brings loss to owner; 2, the method needs outsourcing electric heater and pipe-line system, also needs the robot control system(RCS) increasing electric heater, thus adds system cost.
Therefore, how improving the efficiency of despumation and reduce system cost, is the current technical issues that need to address of those skilled in the art.
Utility model content
In view of this, the utility model provides a kind of knot screen of natural gas liquefaction system, and this knot screen can improve the efficiency of despumation and reduce system cost.
In order to solve the problem, the utility model provides a kind of knot screen of natural gas liquefaction system, comprise removal of impurities pipeline, one end of described removal of impurities pipeline is communicated in the outlet of first order compressor, and the other end of described removal of impurities pipeline is communicated in the entrance of cold box system.
Preferably, in above-mentioned knot screen, the pressure of the natural gas in the exit of described first order compressor is 2 ~ 4MPa.
Preferably, in above-mentioned knot screen, the temperature of the natural gas in the exit of described first order compressor is 80 ~ 120 DEG C.
The knot screen of a kind of natural gas liquefaction system that the utility model provides, comprises removal of impurities pipeline, and one end of this removal of impurities pipeline is communicated in the outlet of first order compressor, and the other end of this removal of impurities pipeline is communicated in the entrance of cold box system.Visible, this programme adopts the existing high pressure of first order compressor outlet, the natural gas of high temperature purges cold box system, and purging speed is fast, pressure is high, temperature is high, drastically increases dust removal rate.This programme does not need to purchase equipment in addition, simplifies process system, saves system cost, thus brings direct economic benefit for owner.
The utility model additionally provides a kind of natural gas liquefaction system, comprises the knot screen described in above-mentioned any one.The derivation of the beneficial effect that the derivation of the beneficial effect that this natural gas liquefaction system produces and above-mentioned knot screen bring is substantially similar, therefore repeats no more herein.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments more of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the natural gas liquefaction system structural representation in the utility model specific embodiment scheme;
Fig. 2 is the cold box system structural representation in the utility model specific embodiment scheme;
In Fig. 1 and Fig. 2:
First order compressor-1, high stage compressor-2, third level compressor-3, First Heat Exchanger-4, the second heat exchanger-5, high-pressure ejector-6, the first separator-7, the second separator-8, the 3rd separator-9, removal of impurities pipeline-10, freon heat exchanger-11, flush type heat exchanger-12, entrance point-91, liquid outlet end-92, gas outlet end-93.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
Please refer to Fig. 1 and Fig. 2, Fig. 1 is the natural gas liquefaction system structural representation in the utility model specific embodiment scheme, and Fig. 2 is the cold box system structural representation in the utility model specific embodiment scheme.In figure, arrow represents the flow direction of natural gas.
In a kind of specific embodiment scheme, the utility model provides a kind of knot screen of natural gas liquefaction system, comprise removal of impurities pipeline 10, one end of removal of impurities pipeline 10 is communicated in the outlet of first order compressor 1, and the other end of removal of impurities pipeline 10 is communicated in the entrance of cold box system.Concrete, this programme configures a road threeway reducing pipeline (i.e. removal of impurities pipeline 10) to ice chest entrance in the outlet of first order compressor 1.
Concrete, the compressor treatment system in this programme natural gas liquefaction system comprises first order compressor 1, high stage compressor 2 and third level compressor 3.Preferably, the pressure of the natural gas in the exit of first order compressor 1 is 2 ~ 4MPa, and the temperature of the natural gas in the exit of first order compressor 1 is 80 ~ 120 DEG C.
Visible, the high pressure that this programme adopts existing first order compressor 1 to export, the natural gas of high temperature purge cold box system, and purging speed is fast, pressure is high, temperature is high, drastically increases dust removal rate.This programme does not need to purchase equipment in addition, simplifies process system, saves system cost, thus brings directly considerable economic benefit for owner.
The utility model additionally provides a kind of natural gas liquefaction system, comprises the knot screen described in above-mentioned any one.The derivation of the beneficial effect that the derivation of the beneficial effect that this natural gas liquefaction system produces and above-mentioned knot screen bring is substantially similar, therefore repeats no more herein.
Concrete, the natural gas liquefaction system that the utility model provides comprises above-mentioned compressor treatment system and cold box system and above-mentioned knot screen.Wherein, the cold box system in this programme comprises First Heat Exchanger 4, second heat exchanger 5, freon heat exchanger 11, high-pressure ejector 6, first separator 7 and the second separator 8.
In this programme, the liquefaction process of natural gas is as follows:
From well raw natural gas out with the pressure of about 2.3MPa, with certain flow through CO
2purification level and H
2o dry stage, and supercharging in compressor treatment system, 20MPa after three stage compression, the high-pressure natural gas of 40 DEG C enter cold box system, then after two-stage heat exchanger and freon heat exchanger 11 heat exchange ,-37 DEG C are cooled to, and enter high-pressure ejector 6 with the pressure of 19.8 ~ 19.9MPa, finally formed the LNG of-142 DEG C after high-pressure ejector 6 swell refrigeration, and Pressure Drop is to 1.2MPa.First separator 7 and the second separator 8 are for separating of liquid and gas, and its operating pressure is respectively about 1.2MPa and 0.4MPa.
Concrete, in First Heat Exchanger 4, natural gas is refluxed and is cooled to 281 ~ 282K.Afterwards, natural gas enters freon heat exchanger 11, and here cooled machine is cooled to 238K.Enter the second heat exchanger 5 again, natural gas direct current is cooled to 206 ~ 208K, and enters the nozzle of high-pressure ejector 6 with the pressure of 19.8 ~ 19.9MPa.
Concrete, in order to be separated liquid and gas, after high-pressure ejector 6, be provided with the first separator 7 and the second separator 8.Pressure in first separator 7 is determined by return pressure, and its operating pressure is respectively about 1.2MPa.Under the adjustment of about 0.57MPa and about 139K, the liquid be separated is sent to user with certain flow from the first separator 7, and another part then enters the second separator 8 with certain flow.The vapor chamber of the second separator 8 is connected by passive stream with high-pressure ejector 6, and its operating pressure maintains by the work of high-pressure ejector 6, and operating pressure is 0.4MPa.
In order to blow down the impurity such as hydrogen, helium and nitrogen, preferably, this programme is provided with flush type heat exchanger 12 and the 3rd separator 9.Concrete, flush type heat exchanger 7 is arranged among the second separator 6, and is connected with return line.3rd separator 8 is provided with entrance point 91, liquid outlet end 92 and gas outlet end 93.Entrance point 91 is connected with return line by flush type heat exchanger 12, and 92, liquid outlet end is connected with the second separator 8.Concrete, the temperature in the 3rd separator 9 is 138 ~ 140K, pressure is 1.17 ~ 1.18MPa.
When carrying out liquefaction process, from the natural gas of return line with the mass flow of about 840kg/h, through flush type heat exchanger 12, enter among the 3rd separator 9.In the 3rd separator 9, under certain temperature, pressure condition, the natural gas of enrichment hydrogen, helium and Nitrogen gas impurity is discharged through gas outlet end 93 with certain flow, liquified natural gas after despumation is then discharged via liquid outlet end 92, thus realizes the object of the inert gas impurity be separated in liquefied natural gas.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the utility model.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein when not departing from spirit or scope of the present utility model, can realize in other embodiments.Therefore, the utility model can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (4)
1. the knot screen of a natural gas liquefaction system, it is characterized in that, comprise removal of impurities pipeline (10), one end of described removal of impurities pipeline (10) is communicated in the outlet of first order compressor (1), and the other end of described removal of impurities pipeline (10) is communicated in the entrance of cold box system.
2. knot screen according to claim 1, is characterized in that, the pressure of the natural gas in the exit of described first order compressor (1) is 2 ~ 4MPa.
3. knot screen according to claim 1, is characterized in that, the temperature of the natural gas in the exit of described first order compressor (1) is 80 ~ 120 DEG C.
4. a natural gas liquefaction system, is characterized in that, comprises the knot screen described in any one of claims 1 to 3.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420564825.1U CN204240706U (en) | 2014-09-28 | 2014-09-28 | A kind of natural gas liquefaction system and knot screen thereof |
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| CN201420564825.1U CN204240706U (en) | 2014-09-28 | 2014-09-28 | A kind of natural gas liquefaction system and knot screen thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105157350A (en) * | 2015-10-23 | 2015-12-16 | 重庆耐德工业股份有限公司 | Technology and system for removing heavy hydrocarbons in natural gas |
| CN106705531A (en) * | 2017-02-22 | 2017-05-24 | 杭州川空通用设备有限公司 | Cold box structure provided with warming gas system and warming technology |
| CN113309494A (en) * | 2021-06-23 | 2021-08-27 | 中海石油(中国)有限公司海南分公司 | Production pipeline and processing system for natural gas hydrate with covering layer and production method thereof |
-
2014
- 2014-09-28 CN CN201420564825.1U patent/CN204240706U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105157350A (en) * | 2015-10-23 | 2015-12-16 | 重庆耐德工业股份有限公司 | Technology and system for removing heavy hydrocarbons in natural gas |
| CN106705531A (en) * | 2017-02-22 | 2017-05-24 | 杭州川空通用设备有限公司 | Cold box structure provided with warming gas system and warming technology |
| CN113309494A (en) * | 2021-06-23 | 2021-08-27 | 中海石油(中国)有限公司海南分公司 | Production pipeline and processing system for natural gas hydrate with covering layer and production method thereof |
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