CN207299714U - A kind of natural gas ethane recovery device using cascade refrigeration - Google Patents
A kind of natural gas ethane recovery device using cascade refrigeration Download PDFInfo
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- CN207299714U CN207299714U CN201721308689.XU CN201721308689U CN207299714U CN 207299714 U CN207299714 U CN 207299714U CN 201721308689 U CN201721308689 U CN 201721308689U CN 207299714 U CN207299714 U CN 207299714U
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Abstract
The utility model discloses a kind of natural gas ethane recovery device using cascade refrigeration, including ice chest, cold catch pot, domethanizing column, dethanizer, propane heat-exchange system and ethene heat-exchange system, wherein：The gas outlet of ice chest is connected with cold catch pot, and the liquid-phase outlet of cold catch pot is connected with domethanizing column, dethanizer, deethanization overhead condenser, deethanizer overhead return tank, propane heat-exchange system, ethene heat-exchange system successively；The top gaseous phase of domethanizing column is connected with ice chest, expanding machine and product air compressor successively.One-component refrigerant multi-level throttle can be improved refrigerating efficiency by the utility model, reduce the coolant compressor load of ethane recovery device refrigerating part to a certain extent；Simple with design, buying is easy, and single compressor power is relatively low, reduces investment, the advantages of energy consumption is low and easy to operate flexible.
Description
Technical field
Lighter hydrocarbons recovery field, especially ethane recovery field are the utility model is related to, is specially that one kind uses cascade refrigeration
The process unit of ethane is recycled in natural gas, suitable for various raw gas pressures, for the raw gas pressure of ethane recovery factory
Makings condition less than 5MPa, not only has higher ethane recovery, but also the advantages of reduce investment outlay and reduce energy consumption.
Background technology
Ethane is the raw material of good chilling thermal cracking ethene, has olefin yields high, byproduct is seldom, and technique is simpler
Single, corresponding investment is reduced, and the construction period is short, and investment repayment waits many advantages soon, and a large amount of utilizations have been obtained in the Middle East and the U.S.,
And China, since itself petroleum reserves is more barren, ethene import volume rises year by year, under the stimulation of inexpensive high profit, alkene
The demand of raw material lighting is strong all the more, and ethane is largely present in outer defeated product natural gas, relatively low currently with rate, root
According to newest demand, more efficiently to utilize natural gas, gas product diversification is realized, greatly develop ethane recovery technology tool
It is significant.
Natural gas ethane recovery factory owner most will use " propane/propylene precooling+expander refrigeration " technique at present.Because
Using one-component refrigerant precooling, unstripped gas precooling temperature is relatively low, relies primarily on swell refrigeration and provides cold, works as raw gas pressure
It is less high, it is impossible to which that when providing enough colds, ethane recovery is then relatively low, not economical enough.And " cascade refrigeration+expansion mechanism
Cold technique " can not only provide relatively low precooling temperature but also can improve ethane recovery, suitable for various raw gas pressures, for raw material
When atmospheric pressure is not high, the problem of investment is high, and energy consumption is big, complicated can be solved.
The content of the invention
The shortcomings that the utility model overcomes in the prior art, there is provided a kind of to be returned using the natural gas ethane of cascade refrigeration
Receiving apparatus, has the advantages of energy consumption is low, it is easy to drive, and single compressor power is relatively low, and reduction invests and is easy to operate flexible.
The technical solution of the utility model is：A kind of natural gas ethane recovery device using cascade refrigeration, including ice chest,
Cold catch pot, domethanizing column, dethanizer, propane heat-exchange system and ethene heat-exchange system, wherein：The gas outlet of ice chest
Be connected with cold catch pot, the liquid-phase outlet of cold catch pot successively with domethanizing column, dethanizer, deethanization overhead condensation
Device, deethanizer overhead return tank, propane heat-exchange system, ethene heat-exchange system are connected；The top gaseous phase of domethanizing column successively with
Ice chest, expanding machine are connected with product air compressor；The gas outlet of ethene heat-exchange system is connected with demethanizer overhead entrance；
Propane compressor, propane condensator, the circulation connection of propane heat-exchange system；Ethylene compressor, propane heat-exchange system, ethene heat exchange system
System circulation connection.
Compared with prior art, the utility model has the advantages that：Suitable for the various raw gas pressure bars of ethane recovery factory
Part, the ethane recovery factory of 5MPa is less than for pressure, and one-component refrigerant multi-level throttle can be improved refrigeration by the utility model
Efficiency, reduces the coolant compressor load of ethane recovery device refrigerating part to a certain extent.It is simple with design, adopt
The advantages of purchase is easy, and single compressor power is relatively low, and reduction is invested, energy consumption is low and easy to operate flexible.
Brief description of the drawings
The utility model will illustrate by example and with reference to the appended drawing, wherein：
Fig. 1 is the technological principle flow chart of the present apparatus.
Embodiment
A kind of natural gas ethane recovery device using cascade refrigeration, as shown in Figure 1, including：Ice chest 1, cold catch pot
2nd, expanding machine 3, domethanizing column 4, domethanizing column bottom of towe reboiler 5, dethanizer 6, deethanization overhead condenser 7, dethanizer
Return tank of top of the tower 8, deethanizer overhead reflux pump 9, dethanizer bottom reboiler 10, product air compressor 11, propane compression
Machine 12, propane condensator 13, propane heat-exchange system 14, ethylene compressor 15, ethene heat-exchange system 16.One kind uses cascade refrigeration
Natural gas ethane recovery device be broadly divided into three parts, be respectively：Rectifying part, propane refrigeration part and ethylene refrigeration portion
Point.
First, rectifying part：The progress rectifying of raw material natural gas is separated into ethane product, C by the part3+ natural with product
Gas.
Ice chest 1 be ethane recovery device unstripped gas precooling and low temperature gas supercooling place, ice chest 1 successively with cold catch pot
2nd, expanding machine 3, domethanizing column 4 and product air compressor 11 connect.
The liquid phase that cold catch pot 2 exports is connected directly with domethanizing column 4；The liquid phase and deethanization that domethanizing column 4 exports
Tower 6 is connected directly；Dethanizer 6 and deethanization overhead condenser 7, deethanization return tank of top of the tower 8, deethanization tower top reflux pump 9
It is sequentially connected；The outlet of deethanization tower top reflux pump 9 is connected with 6 tower top entrance of dethanizer；4 bottom of domethanizing column is equipped with piptonychia
Alkane bottom reboiler 5, for providing heat for 4 bottom of domethanizing column；6 bottom of dethanizer is equipped with deethanization bottom reboiler
10, for providing heat for 6 bottom of dethanizer.
2nd, propane refrigeration part：The part is mainly that the liquefaction of product ethane and supercooling provide cold.
The gas phase that deethanizer overhead return tank 8 exports is ethane product, is with propane heat-exchange system 14 and ethene heat exchange
System 16 be connected be condensed into liquid after be delivered to ethane storage tank.
12 exit gas of propane compressor is connected to form propane refrigeration with propane condensator 13, propane heat-exchange system 14 successively
System circulation.
3rd, ethylene refrigeration part：The part is mainly the product gas liquefaction and supercooling offer cold to flow back.
Product air compressor 11 exports most of directly outer defeated, and remainder, which needs to be condensed into domethanizing column 4, provides cold,
Therefore it is connected successively with propane heat-exchange system 14 and ethene heat-exchange system 16, is condensed into after liquid and is connected again with domethanizing column 4.
The gas phase that ethylene compressor 15 exports is connected to form second with propane heat-exchange system 14 and ethene heat-exchange system 16 successively
Alkene refrigeration system circulates.
The method for recycling ethane from natural gas using cascade refrigeration, including following content：
1st, rectifying part
The drying natural gas containing ethane of 3.0~7.0MPa.g is connected with ice chest 1, is cooled to -35~-75 DEG C in advance by ice chest 1
Behind left and right, the gas phase most of (about 60~80% or so) isolated by cold catch pot 2 enters expanding machine 3, after expansion
For gaseous pressure to domethanizing column 4 is directly entered after 2.0~4.0MPa.g, it is further that remaining small part gas phase goes successively to ice chest 1
Condensation is to -80~-95 DEG C into entering back into 4 top of domethanizing column after liquid.The liquid phase that cold catch pot 2 is isolated then throttle to
Domethanizing column 4 is directly entered after 2.2~4.0MPa.g.The pressure of domethanizing column is controlled in 1.8~3.8MPa.g.
The C that 4 bottom of towe of domethanizing column comes out2+ be directly entered dethanizer 6, the pressure control of dethanizer 6 1.6~
3.5MPa.g, after the fractionation of dethanizer 6, the gas phase that tower top comes out is connected with deethanization overhead condenser 7, partial condensation
Then pass through deethanizer overhead reflux pump to -30~5 DEG C or so the rear liquid isolated by deethanizer overhead return tank 8
9 are delivered to 6 tower top of dethanizer then produces as its phegma, the isolated gas phase of deethanizer overhead return tank 8 for ethane
Product.
The gas phase that 4 tower top of domethanizing column comes out is exchanged heat to after 10~35 DEG C by ice chest 1, then to pass sequentially through expanding machine 3 same
80%~90% as defeated outside product natural gas after axis pressurized end and the supercharging of product air compressor 11.
2nd, propane refrigeration part
Propane heat-exchange system 14 includes high pressure propane evaporator, middle pressure propane evaporator and low-pressure propane evaporator, at this
Gas phase ethane product is condensed and is cooled to -34~-37 DEG C in system, the product natural gas of reflux is cooled to -34~-37 in advance
DEG C, and refrigerant ethylene cold coalescence is cooled to -34~-37 DEG C.
The refrigerant propane that 1300~1700kPa is pressurized to through propane compressor 12 condenses and cold by propane condensator 13
But to propane heat-exchange system 14 is entered after 30~50 DEG C, cold is provided for high pressure propane evaporator by throttling to 15~23 DEG C,
The product natural gas of reflux and refrigerant ethene are cooled in advance in entering after 18~26 DEG C and press propane evaporator.High pressure propane is evaporated
Phase propane in device returns to the three-level pumping entrance of propane compressor 12, the petrogas isolated then continue throttling to-
Propane evaporator is pressed in 15~-5 DEG C of entrance, cold is provided for it, by ethane product, the product natural gas of reflux and refrigerant second
Alkene enters low-pressure propane evaporator after being cooled to -12~-2 DEG C.Phase propane in middle pressure propane evaporator returns to propane compression
The two-stage supercharging entrance of machine, the petrogas isolated then continue extremely -39~-37 DEG C of throttling and enter low-pressure propane evaporator,
Cold is provided for it, ethane product, the product natural gas of reflux and refrigerant ethene are cooled to -36~-34 DEG C and enter ethene
Heat-exchange system.The gas phase that low-pressure propane evaporator is separated enters the level-one pumping entrance of propane compressor 12.Propane is then complete
Into kind of refrigeration cycle.
3rd, ethylene refrigeration
Ethene heat-exchange system 16 includes high-pressure ethylene evaporator, middle pressure ethene evaporator and low pressure ethylene evaporator, at this
The ethane product of condensation is crossed in system and is cooled to -90~-85 DEG C, by the product natural gas liquefaction of reflux and is cooled to -95~-90 excessively
℃。
The refrigerant ethene that 1600~2400kPa is pressurized to through ethylene compressor 15 passes sequentially through the condensation of ethene heat-exchange system
And after being cooled to -36~-34 DEG C extremely cold is provided by throttling for high-pressure ethylene evaporator for -60~-50 DEG C, by the product of reflux
Natural gas and ethane press ethene evaporator in entering after precooling -57~47 DEG C.Gaseous ethene in high-pressure ethylene evaporator returns
The three-level pumping entrance of ethylene compressor 15 is returned, the liquid ethylene isolated then continues to press in throttling to -81~-73 DEG C of entrance
Ethene evaporator, cold is provided for it, and low pressure second is entered after the product natural gas and ethane of reflux are cooled to -78~-70 DEG C
Alkene evaporator.Gaseous ethene in middle pressure ethene evaporator returns to the two-stage supercharging entrance of ethylene compressor 15, the liquid isolated
Body ethene then continues throttling to -98~-93 DEG C into low pressure ethylene evaporator, cold is provided for it, by the product day of reflux
Its phegma is used as to the top of domethanizing column 4 after extremely -95~-90 DEG C of right air cooling, ethane conveys after being cooled to -90~-85 DEG C
Stored to ethane storage tank.The gas phase that low pressure ethylene evaporator is separated enters the level-one pumping entrance of ethylene compressor 15.Second
Alkene then completes kind of refrigeration cycle.
Propane refrigeration part can use propylene refrigeration in the utility model, and ethylene refrigeration part can use ethane to freeze.
Domethanizing column and dethanizer are respectively equipped with reboiler in the utility model.
Domethanizing column is that plate column can also be filler and the board-like form being combined in the utility model, and dethanizer can
To be that plate column can also be packed tower.
In the utility model, propane heat-exchange system according to the pressure of ethane product, can also be single-stage heat exchange or
Two-stage heat exchange either level Four exchange heat corresponding propane compressor entrance can be level-one supercharging or two-step supercharging or
It is level Four supercharging.
In the utility model, propane cryogen can also be propylene.
In the utility model, according to the difference of propane compressor outlet pressure, propane condensator 13 is circulating water condensing,
Air cooler can be used to condense.
In the utility model, ethene heat-exchange system according to the pressure of the product natural gas of reflux, can be two-stage heat exchange or
Person's level Four exchanges heat, and corresponding ethylene compressor entrance can be two-step supercharging either level Four supercharging.
In the utility model, according to the requirement of ethane condition of storage and reflux product natural gas refrigeration temperature difference,
Ethene cryogen can also change ethane into.
The liquid phase that dethanizer bottom comes out in the utility model is C3+, can be decided whether according to user demand by taking off fourth
Alkane tower is fractionated to obtain and is sold outside LPG products and stable light hydrocarbon product, can also directly outer sell.Realize product diversification.
Claims (5)
- A kind of 1. natural gas ethane recovery device using cascade refrigeration, it is characterised in that：Including ice chest, cold catch pot, take off Methane tower, dethanizer, propane heat-exchange system and ethene heat-exchange system, wherein：The gas outlet and cold catch pot of ice chest Connection, the liquid-phase outlet of cold catch pot successively with domethanizing column, dethanizer, deethanization overhead condenser, dethanizer tower Top return tank, propane heat-exchange system, ethene heat-exchange system are connected；The top gaseous phase of domethanizing column successively with ice chest, expanding machine and Product air compressor is connected；The gas outlet of ethene heat-exchange system is connected with demethanizer overhead entrance；Propane compressor, third Alkane condenser, the circulation connection of propane heat-exchange system；Ethylene compressor, propane heat-exchange system, the circulation connection of ethene heat-exchange system.
- A kind of 2. natural gas ethane recovery device using cascade refrigeration according to claim 1, it is characterised in that：Low temperature The gaseous phase outlet of separator is divided into two-way, is connected successively with expanding machine, domethanizing column all the way, another way successively with ice chest, piptonychia Alkane tower upper inlet connects.
- A kind of 3. natural gas ethane recovery device using cascade refrigeration according to claim 1, it is characterised in that：De- second The liquid-phase outlet of alkane column overhead return tank is connected with deethanizer overhead reflux pump, deethanizer overhead phegma import successively.
- A kind of 4. natural gas ethane recovery device using cascade refrigeration according to claim 1, it is characterised in that：It is described Domethanizing column and dethanizer bottom of towe are equipped with reboiler.
- A kind of 5. natural gas ethane recovery device using cascade refrigeration according to claim 1, it is characterised in that：It is described Domethanizing column is plate column or filler and the board-like form being combined, and dethanizer is plate column or packed tower.
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| CN201721308689.XU CN207299714U (en) | 2017-10-12 | 2017-10-12 | A kind of natural gas ethane recovery device using cascade refrigeration |
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| CN201721308689.XU CN207299714U (en) | 2017-10-12 | 2017-10-12 | A kind of natural gas ethane recovery device using cascade refrigeration |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107560319A (en) * | 2017-10-12 | 2018-01-09 | 中国石油工程建设有限公司 | A kind of natural gas ethane recovery device and method using cascade refrigeration |
| CN109028758A (en) * | 2018-08-07 | 2018-12-18 | 中国石油工程建设有限公司 | A kind of natural gas ethane recovery device and method to be freezed using azeotrope |
| CN109059420A (en) * | 2018-09-06 | 2018-12-21 | 中国石油工程建设有限公司 | A kind of natural gas ethane recovery device and method of energy integrated utilization |
| CN110617640A (en) * | 2019-09-27 | 2019-12-27 | 西南石油大学 | Combined refrigeration method for low-pressure rich-gas ethane recovery |
| CN111704518A (en) * | 2020-07-08 | 2020-09-25 | 西安长庆科技工程有限责任公司 | Device and method for controlling condensation rate of gaseous ethane at top of deethanizer |
-
2017
- 2017-10-12 CN CN201721308689.XU patent/CN207299714U/en active Active
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107560319A (en) * | 2017-10-12 | 2018-01-09 | 中国石油工程建设有限公司 | A kind of natural gas ethane recovery device and method using cascade refrigeration |
| WO2019071869A1 (en) * | 2017-10-12 | 2019-04-18 | 中国石油工程建设有限公司 | Device and method using stepped cooling to recover ethane from natural gas |
| CN107560319B (en) * | 2017-10-12 | 2019-08-23 | 中国石油工程建设有限公司 | A kind of natural gas ethane recovery device and method using cascade refrigeration |
| CN109028758A (en) * | 2018-08-07 | 2018-12-18 | 中国石油工程建设有限公司 | A kind of natural gas ethane recovery device and method to be freezed using azeotrope |
| CN109059420A (en) * | 2018-09-06 | 2018-12-21 | 中国石油工程建设有限公司 | A kind of natural gas ethane recovery device and method of energy integrated utilization |
| CN110617640A (en) * | 2019-09-27 | 2019-12-27 | 西南石油大学 | Combined refrigeration method for low-pressure rich-gas ethane recovery |
| CN111704518A (en) * | 2020-07-08 | 2020-09-25 | 西安长庆科技工程有限责任公司 | Device and method for controlling condensation rate of gaseous ethane at top of deethanizer |
| CN111704518B (en) * | 2020-07-08 | 2024-04-02 | 西安长庆科技工程有限责任公司 | Device and method for controlling gaseous ethane condensation rate at top of deethanizer |
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Effective date of registration: 20210224 Address after: No. 6, Sichuan hi tech Zone, sublime Road, Chengdu, Sichuan Patentee after: CHINA PETROLEUM ENGINEERING & CONSTRUCTION Corp. Patentee after: CHINA NATIONAL PETROLEUM Corp. Address before: No. 6, Sichuan hi tech Zone, sublime Road, Chengdu, Sichuan Patentee before: CHINA PETROLEUM ENGINEERING & CONSTRUCTION Corp. |