CN102453569A - Natural gas expansion refrigeration liquefying process - Google Patents
Natural gas expansion refrigeration liquefying process Download PDFInfo
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- CN102453569A CN102453569A CN2010105194880A CN201010519488A CN102453569A CN 102453569 A CN102453569 A CN 102453569A CN 2010105194880 A CN2010105194880 A CN 2010105194880A CN 201010519488 A CN201010519488 A CN 201010519488A CN 102453569 A CN102453569 A CN 102453569A
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Abstract
The invention discloses a natural gas expansion refrigeration liquefying process, which mainly comprises the following steps of: removing water and CO2 from a feed gas; cooling and liquefying; providing cold energy for a heat exchanger; and completing natural gas expansion refrigeration liquefying, and the like. The process has the advantages of simple flow, flexibility for adjusting, working reliability, easiness for starting and operating, and convenience for maintaining.
Description
Technical field
The present invention relates to a kind of Sweet natural gas swell refrigeration liquefaction process.
Background technology
Peak regulation type natural gas liquefaction flow process is annual divides 3 stages to move, i.e. liquefaction stage, stand-by phase and gasification delivery phase.The liquefaction stage cycle is generally at 50～300 days, with the obtainable residue natural gas liquefaction in the upper reaches; The stand-by phase natural gas liquids is stored in the storage tank, and not having the liquefaction Sweet natural gas increases and output; The gasification delivery phase is sent the liquefied natural gas gasifying that stores into gas distributing system.
Compare with BL type liquefied natural gas plant, the industrial scale of peak regulation type liquefied natural gas plant is less, and its liquefying power is generally about 1/10 of load peak, but the ability of storage and gasification is very big, and common vaporization ability is 10 times of liquefying power.The liquefying power of typical peak regulation type lng plant is 10～20 * 104Nm
3/ d, refrigeration power is approximately 1500～7000kW, and storage volume is 2～10 * 104m
3
That peak regulation type natural gas liquefaction flow process requires to have is efficient, flexible, easy, characteristics cheaply, wherein important with low cost.Companies such as APCI, Pritchard, Linde, Gaz de France, CBI, BOC provide relevant natural gas liquefaction technology unexpectedly mutually, this market of contention peak regulation type natural gas liquefaction device.
Natural gas liquids has wide application prospect in the city with field, controlled atmosphere peak, but the natural gas liquids technology of China start late, compare in addition very big gap with developed countries.In decades, existing abroad a large amount of peak regulation type devices are constructed and put into operation, so aspects such as plant design, construction, accumulating, use, management, all have the technical experience of success can supply to use for reference.
China is from the nineties in last century; Under the collaboration of national science and technology department and relevant institute; Kaifeng Chiller Instrument Factory, coke-oven plant, Beijing, Mianyang, Sichuan gas company, Jilin Oil Field, long celebrating oil field, Shanghai gas company, Zhongyuan Oil Field etc. are successively arranged; Bold trial has been carried out in the development of centering small liquid gas plant, obtains valuable practical experience.
Utilize the ducted HPG of virgin gas, isentropic expansion in the refrigeration cycle decompressor, the low temperature cold of acquisition another strand Sweet natural gas that is used to liquefy is referred to as the circulation of Sweet natural gas expander refrigeration.Sweet natural gas after the isentropic expansion is sent into low-pressure pipe network at last.
Summary of the invention
The objective of the invention is to overcome the shortcoming and defect of above-mentioned prior art, provide a kind of flow process simple, regulate flexibly, reliable operation, be prone to start, Sweet natural gas swell refrigeration liquefaction process easy to operate, easy to maintenance.
The object of the invention is realized through following technical proposals: Sweet natural gas swell refrigeration liquefaction process may further comprise the steps:
(a) at first, after virgin gas dewatered through water trap, part gets into took off CO
2Tower removes CO
2
(b) then, virgin gas removes CO
2After, behind interchanger and supercooler, liquefy, get into storage tank behind the partial throttling and store, for interchanger and supercooler cold is provided after another part throttling;
(c) last, self-evaporating gas in the storage tank at first for interchanger provides cold, gets into and returns air compressor, and compression is also cooled off the back and do not advanced to take off CO
2The virgin gas of tower mixes, advance the interchanger cooling after, get into the decompressor cooling, for interchanger provides cold.
Said raw gas pressure is 4.0MPa, and corresponding liquefying-point is 180K.
Be divided into two strands after the said virgin gas dehydration, 80% gets into the refrigeration branch road, and 20% as treating that liquefied gas gets into ice chest after being further purified; Sweet natural gas in the refrigeration branch road is cooled to the expander inlet temperature in interchanger; After separator separates went out condensation product, gas phase partly got into turbo-expander, expand into 1.3MPa; Return interchanger then; And converge with the high pressure component gases, combined gas streams gets into interchanger and is heated to room temperature, sends into pipe network by supercharger at last.
Temperature after said decompressor expands is 180K～170K, and this is to remove CO in pre-treatment, saving on the one hand
2Device because molar content is 1% CO
2Meeting is in the following crystallization of 170K, thus the obstruction refrigeration circuit; Also be for preventing that more liquefaction of gases appears in Sweet natural gas in the refrigeration circuit on the other hand.
In sum, the invention has the beneficial effects as follows:
(1) since with Sweet natural gas this as working medium, it is consumption of power hardly, and that strand Sweet natural gas that only need treat liquefaction removes impurity, thereby pre-treatment tolerance can greatly reduce, and accounts for 20%～35% of total tolerance;
(2) flow process simple, regulate flexibly, reliable operation, be prone to start, easy to operate, easy to maintenance.
Description of drawings
Fig. 1 is a schematic flow sheet of the present invention.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention is done further detailed description, but embodiment of the present invention is not limited only to this.
Embodiment 1:
The schematic flow sheet of Sweet natural gas swell refrigeration liquefaction process as shown in Figure 1 can know that its working process is: after virgin gas dewatered through water trap 1, part gets into took off CO
2Tower removes CO
2This part Sweet natural gas removes CO
2After, liquefaction behind interchanger 5,6,7 and supercooler 8 gets into storage tank 9 and stores behind the partial throttling, for interchanger 5,6,7 and supercooler 8 cold is provided after another part throttling.Self-evaporating gas at first provides cold for interchanger 5 in the storage tank 9, gets into and returns air compressor 4, and compression is also cooled off the back and do not advanced to take off CO
2The virgin gas of tower mixes, advance interchanger 5 coolings after, get into decompressor 10 coolings, for interchanger 5,6,7 provides cold.
Among Fig. 1, raw gas pressure is 4.0MPa, and corresponding liquefying-point is about 180K.Be divided into two strands after the virgin gas dehydration, about 80% gets into the refrigeration branch road, and 20% as treating that liquefied gas gets into ice chest after being further purified.Sweet natural gas in the refrigeration branch road is cooled to the expander inlet temperature in interchanger; After separator separates went out condensation product, gas phase partly got into turbo-expander, expand into about 1.3MPa; Return interchanger then; And converge with the high pressure component gases, combined gas streams gets into interchanger and is heated to room temperature, sends into pipe network by supercharger at last.Temperature design after turbo-expander expands is 180K～170K: this is in pre-treatment, saving the device that removes CO2 on the one hand because molar content be 1% CO2 can be in the following crystallization of 170K, thereby stop up refrigeration circuit; Also be for preventing that more liquefaction of gases appears in Sweet natural gas in the refrigeration circuit on the other hand.
By on can know since with Sweet natural gas this as working medium, it is consumption of power hardly, and that strand Sweet natural gas that only need treat liquefaction removes impurity, thereby pre-treatment tolerance can greatly reduce, and accounts for 20%～35% of total tolerance; The technical process that the present invention relates to is simple, regulate flexibly, reliable operation, be prone to start, easy to operate, easy to maintenance.
The above only is preferred embodiment of the present invention, is not the present invention is done any pro forma restriction, and every foundation technical spirit of the present invention, any simple modification, equivalent variations to above embodiment did all fall within protection scope of the present invention.
Claims (4)
1. Sweet natural gas swell refrigeration liquefaction process is characterized in that, may further comprise the steps:
(a) at first, after virgin gas dewatered through water trap, part gets into took off CO
2Tower removes CO
2
(b) then, virgin gas removes CO
2After, behind interchanger and supercooler, liquefy, get into storage tank behind the partial throttling and store, for interchanger and supercooler cold is provided after another part throttling;
(c) last, self-evaporating gas in the storage tank at first for interchanger provides cold, gets into and returns air compressor, and compression is also cooled off the back and do not advanced to take off CO
2The virgin gas of tower mixes, advance the interchanger cooling after, get into the decompressor cooling, for interchanger provides cold.
2. Sweet natural gas swell refrigeration liquefaction process according to claim 1 is characterized in that said raw gas pressure is 4.0MPa, and corresponding liquefying-point is 180K.
3. Sweet natural gas swell refrigeration liquefaction process according to claim 1 is characterized in that, is divided into two strands after the said virgin gas dehydration, and 80% gets into the refrigeration branch road, and 20% as treating that liquefied gas gets into ice chest after being further purified; Sweet natural gas in the refrigeration branch road is cooled to the expander inlet temperature in interchanger; After separator separates went out condensation product, gas phase partly got into turbo-expander, expand into 1.3MPa; Return interchanger then; And converge with the high pressure component gases, combined gas streams gets into interchanger and is heated to room temperature, sends into pipe network by supercharger at last.
4. Sweet natural gas swell refrigeration liquefaction process according to claim 1 is characterized in that, the temperature after said decompressor expands is 180K～170K.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2010105194880A CN102453569A (en) | 2010-10-18 | 2010-10-18 | Natural gas expansion refrigeration liquefying process |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010105194880A CN102453569A (en) | 2010-10-18 | 2010-10-18 | Natural gas expansion refrigeration liquefying process |
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| CN102453569A true CN102453569A (en) | 2012-05-16 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104132245A (en) * | 2014-07-18 | 2014-11-05 | 辽宁石油化工大学 | Peak load shaving and refrigeration method and device based on natural gas hydrate technology |
-
2010
- 2010-10-18 CN CN2010105194880A patent/CN102453569A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104132245A (en) * | 2014-07-18 | 2014-11-05 | 辽宁石油化工大学 | Peak load shaving and refrigeration method and device based on natural gas hydrate technology |
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Application publication date: 20120516 |