CN205102508U - Backflow LNG apparatus for producing of expander of adoption - Google Patents
Backflow LNG apparatus for producing of expander of adoption Download PDFInfo
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- CN205102508U CN205102508U CN201520707390.6U CN201520707390U CN205102508U CN 205102508 U CN205102508 U CN 205102508U CN 201520707390 U CN201520707390 U CN 201520707390U CN 205102508 U CN205102508 U CN 205102508U
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- tail gas
- lng
- expansion machine
- decompressor
- expander
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Abstract
The utility model discloses a backflow LNG apparatus for producing of expander of adoption, including LNG production system and refrigerating system, refrigerating system includes cold box (2), sets up heat exchanger unit (9), mixed cryogen liquid expander (8) and the mixed cryogen compression unit (10) of setting in cold box (2) in cold box (2), heat exchanger unit (9), mixed cryogen liquid expander (8) and mixed cryogen compression unit (10) are connected through the pipeline, the LNG production system includes purification unit (1), separator (3), denitrogenation tower (4), natural gas liquid volume expansion machine (5), LNG storage tank (6) and tail gas backflow expander (7). The beneficial effects of the utility model are that: through using the tail gas expander that backflows, reduced the irreversibility of flow, make full use of the pressure energy of tail gas does not congeal, saved the energy consumption, reduction in production cost compares in not adopting the backflow LNG device of expander of tail gas, the energy consumption can practice thrift about 5%.
Description
Technical field
The utility model relates to LNG process units, particularly a kind of LNG process units adopting stream backed expansion machine.
Background technology
In usual LNG process units, the not solidifying tail gas of certain pressure reduces outside pressure exhaust by the mode of choke valve, and pressure energy is not fully utilized.The cavitation that throttling process is attended by also inevitably reduces the life-span of choke valve.Adopt tail gas stream backed expansion machine to replace choke valve, not only eliminate the irreversibility of throttling, also eliminate cavitation, meanwhile, the external work of tail gas stream backed expansion machine can be recycled, and reduces the energy consumption of device, take full advantage of the energy of tail gas, decrease the operating cost of device.
Utility model content
The purpose of this utility model is the shortcoming overcoming prior art, provides a kind of compact conformation, reduces the LNG process units of energy consumption, employing stream backed expansion machine that operating flexibility is high.
The purpose of this utility model is achieved through the following technical solutions: a kind of LNG process units adopting stream backed expansion machine, comprise LNG production system and refrigeration system, refrigeration system comprises ice chest, the heat exchanger unit be arranged in ice chest, be arranged on azeotrope liquid expander in ice chest and azeotrope compression unit, and heat exchanger unit, azeotrope liquid expander are connected by pipeline with azeotrope compression unit;
LNG production system comprises clean unit, separator, denitrification column, natural gas liquids decompressor, LNG storage tank and tail gas stream backed expansion machine, separator, denitrification column, natural gas liquids decompressor and tail gas reflux decompressor are arranged in ice chest, clean unit, separator, denitrification column, natural gas liquids decompressor and LNG storage tank pass through pipeline communication successively, separator and tail gas stream backed expansion machine pass through pipeline communication, pipeline between separator and tail gas stream backed expansion machine is communicated with denitrification column, and the pipeline between clean unit and separator is through heat exchanger unit.
Described azeotrope liquid expander is coaxially connected with generator A, and natural gas liquids decompressor is coaxially connected with generator B, and tail gas reflux decompressor is coaxially connected with generator C.
The fixed gas that described separator and denitrification column are produced enters tail gas stream backed expansion machine expansion work, reclaims tail gas energy.
Described azeotrope liquid expander and natural gas liquids decompressor can replace with choke valve, obtain low temperature by throttle effect.
Described tail gas stream backed expansion machine outlet pressure is 0.01 ~ 0.6MPa.
The component of the azeotrope that described refrigeration system uses is combined by the component arbitrary proportion of two or more in nitrogen, methane, ethane, ethene, propane, propylene, butane, pentane and hexane, and the azeotrope pressure entering ice chest is 0.5 ~ 6MPa.
The utility model has the following advantages: the not solidifying tail gas that separator and denitrification column produce enters in heat exchanger unit from tail gas stream backed expansion machine, for cooling and liquefaction unstripped gas supplement cold, thus saves energy consumption; By using tail gas stream backed expansion machine, replacing the choke valve in traditional process, reducing the irreversibility of flow process, save energy consumption, reduce production cost.
Accompanying drawing explanation
Fig. 1 is a kind of structural representation adopting the LNG process units of stream backed expansion machine;
In figure, 1-clean unit, 2-ice chest, 3-separator, 4-denitrification column, 5-natural gas liquids decompressor, 6-LNG storage tank, 7-tail gas reflux decompressor, 8-azeotrope liquid expander, 9-heat exchanger unit, 10-azeotrope compression unit, 11-fuel exhaust gas, 12-generator A, 13-generator B, 14-generator C.
Detailed description of the invention
Be further described the utility model below in conjunction with accompanying drawing, protection domain of the present utility model is not limited to the following stated:
As shown in Figure 1, a kind of LNG process units adopting stream backed expansion machine, comprise LNG production system and refrigeration system, refrigeration system comprise ice chest 2, the heat exchanger unit 9 be arranged in ice chest 2, the azeotrope compression unit 10 that is arranged on the azeotrope liquid expander 8 in ice chest 2 and is arranged on outside ice chest 2;
LNG production system comprises clean unit 1, separator 3, denitrification column 4, natural gas liquids decompressor 5, LNG storage tank 6 and tail gas reflux decompressor 7, separator 3, denitrification column 4, natural gas liquids decompressor 5 and tail gas reflux decompressor 7 are arranged in ice chest 2, clean unit 1, separator 3, denitrification column 4, natural gas liquids decompressor 5 and LNG storage tank 6 pass through pipeline communication successively, separator 3 and tail gas reflux decompressor 7 pass through pipeline communication, pipeline between separator 3 and tail gas reflux decompressor 7 is communicated with denitrification column 4, pipeline between clean unit 1 and separator 3 is through heat exchanger unit 9, in the present embodiment, azeotrope liquid expander 8 and natural gas liquids decompressor 5 can replace with choke valve, low temperature is obtained by throttle effect.
In the present embodiment, described azeotrope liquid expander 8 is coaxially connected with generator A12, natural gas liquids decompressor 5 is coaxially connected with generator B13, tail gas stream backed expansion machine 7 is coaxially connected with generator C14, the expansion work of azeotrope liquid expander 8, natural gas liquids decompressor 5 and tail gas stream backed expansion machine 7 except for except generator, can also be used for driving device, such as compressor, pump etc., when being used for driving compressor, can supercharging unstripped gas, cold-producing medium and BOG.
In the present embodiment, the component of the azeotrope that described refrigeration system uses is combined by the component arbitrary proportion of two or more in nitrogen, methane, ethane, ethene, propane, propylene, butane, pentane and hexane, and the azeotrope pressure entering ice chest 2 is 0.5 ~ 6MPa.
The course of work of the present utility model is as follows: unstrpped gas enters clean unit 1, form purified gas being cleaned after unit 1 processes, purified gas is cooled by the heat exchanger unit 9 in ice chest 2, separator 3 is entered after being cooled to uniform temperature, and be separated the not solidifying tail gas and dehydrogenation liquid natural gas that are rich in hydrogen, dehydrogenation liquid natural gas enters denitrification column 4 and isolates the not solidifying tail gas and denitrogenation liquid natural gas that are rich in nitrogen further, denitrogenation liquid natural gas enters to enter in LNG storage tank 6 after natural gas liquids decompressor 5 is depressured to LNG storage tank 6 required pressure value and is stored, liquified natural gas expansion work in natural gas liquids decompressor 5 reclaims generating by generator B13, also may be used for unstripped gas, cold-producing medium pressurizes, the not solidifying tail gas being rich in hydrogen and the not solidifying tail gas being rich in nitrogen converge rear introducing tail gas stream backed expansion machine 7, expand after lowering the temperature and enter purified gas and the azeotrope that heat exchanger unit 9 help cooling enters ice chest 2, tail gas is discharged outside ice chest 2 after rewarming to normal temperature, tail gas stream backed expansion machine 5 outlet pressure is 0.01 ~ 0.6MPa, tail gas expansion work in tail gas stream backed expansion machine 7 reclaims generating by generator C14, also may be used for unstripped gas, cold-producing medium pressurizes.
Claims (4)
1. one kind adopts the LNG process units of stream backed expansion machine, it is characterized in that: comprise LNG production system and refrigeration system, refrigeration system comprises ice chest (2), the heat exchanger unit (9) be arranged in ice chest (2), be arranged on azeotrope liquid expander (8) in ice chest (2) and azeotrope compression unit (10), and heat exchanger unit (9), azeotrope liquid expander (8) are connected by pipeline with azeotrope compression unit (10);
LNG production system comprises clean unit (1), separator (3), denitrification column (4), natural gas liquids decompressor (5), LNG storage tank (6) and tail gas stream backed expansion machine (7), separator (3), denitrification column (4), natural gas liquids decompressor (5) and tail gas reflux decompressor (7) are arranged in ice chest (2), clean unit (1), separator (3), denitrification column (4), natural gas liquids decompressor (5) and LNG storage tank (6) pass through pipeline communication successively, separator (3) and tail gas stream backed expansion machine (7) pass through pipeline communication, pipeline between separator (3) and tail gas stream backed expansion machine (7) is communicated with denitrification column (4), pipeline between clean unit (1) and separator (3) is through heat exchanger unit (9).
2. a kind of LNG process units adopting stream backed expansion machine according to claim 1, it is characterized in that: described azeotrope liquid expander (8) and generator A(12) be coaxially connected, natural gas liquids decompressor (5) and generator B(13) be coaxially connected, tail gas reflux decompressor (7) and generator C(14) be coaxially connected.
3. a kind of LNG process units adopting stream backed expansion machine according to claim 1, is characterized in that: described azeotrope liquid expander (8) and natural gas liquids decompressor (5) can replace with choke valve, obtain low temperature by throttle effect.
4. a kind of LNG process units adopting stream backed expansion machine according to claim 1, is characterized in that: described tail gas stream backed expansion machine (5) outlet pressure is 0.01 ~ 0.6MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520707390.6U CN205102508U (en) | 2015-09-14 | 2015-09-14 | Backflow LNG apparatus for producing of expander of adoption |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520707390.6U CN205102508U (en) | 2015-09-14 | 2015-09-14 | Backflow LNG apparatus for producing of expander of adoption |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205102508U true CN205102508U (en) | 2016-03-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520707390.6U Active CN205102508U (en) | 2015-09-14 | 2015-09-14 | Backflow LNG apparatus for producing of expander of adoption |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205102508U (en) |
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2015
- 2015-09-14 CN CN201520707390.6U patent/CN205102508U/en active Active
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 611700 north area of Chengdu modern industrial port, Pixian County, Chengdu City, Sichuan Province Patentee after: Sichuan Shudao Equipment Technology Co.,Ltd. Address before: 611700 north area of Chengdu modern industrial port, Pixian County, Chengdu City, Sichuan Province Patentee before: CHENGDU SHENLENG LIQUEFACTION PLANT Co.,Ltd. |