CN202265558U - Device for producing liquefied natural gas from coke oven gas - Google Patents
Device for producing liquefied natural gas from coke oven gas Download PDFInfo
- Publication number
- CN202265558U CN202265558U CN2011203604679U CN201120360467U CN202265558U CN 202265558 U CN202265558 U CN 202265558U CN 2011203604679 U CN2011203604679 U CN 2011203604679U CN 201120360467 U CN201120360467 U CN 201120360467U CN 202265558 U CN202265558 U CN 202265558U
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- China
- Prior art keywords
- heat exchanger
- main heat
- natural gas
- mix refrigerant
- nitrogen
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Abstract
The utility model relates to a device for producing liquefied natural gas from coke oven gas. A traditional liquefied natural gas (LNG) device adopts a single mixed refrigerant compressor to generate cold energy, a mixed refrigerant serves as a cold source, and not only is isopentane or isobutane in the refrigerant frozen easily due to a low temperature, but also methane in the refrigerant may be frozen if the temperature is too low. The device for producing the liquefied natural gas from the coke oven gas comprises a main heat exchanger (1) installed in a cold box. The main heat exchanger is respectively connected with a mixed refrigerant compression refrigeration system and a nitrogen compression refrigeration system. A condenser (3) is installed at the top of a rectifying tower (2) connected with the main heat exchanger through a pipeline, a reboiler (4) is installed at the bottom of the rectifying tower, an output pipeline of the condenser is connected with the main heat exchanger through a subcooler (5) and connected with a fuel output pipeline (6) finally, and the reboiler is connected with a liquefied natural gas storage tank (7) after connected with the subcooler through a pipeline. The device is used for producing the liquefied natural gas from the coke oven gas.
Description
Technical field:
the utility model relates to a kind of equipment of from coke-oven gas, producing liquify natural gas.
Background technology:
Coke-oven gas is claimed coke-oven gas again, and its staple is the methane (CH of hydrogen, the content of content about 55% about about 25%
4
), carbon monoxide (CO), carbonic acid gas (CO
2
) and nitrogen (N
2
) content about 20%.Because coke(oven)gas is rich in hydrogen, methane and carbon monoxide; Therefore can improve calorific value through methanation reaction; Make most carbon monoxide, carbonic acid gas change into methane, can obtain the above synthetic natural gas of methane volume(tric)fraction 40-50%, obtain natural gas liquids (LNG) through liquefaction again.Gas employing methanation of coke oven is produced the natural gas liquids technology, and it is little to have an investment, consumes advantages such as low, pollution-free, that capacity usage ratio is high, the produce market prospect is good, is the preferable selection of coal chemical enterprise coal gas utilization.
since in the coke-oven gas hydrogen content higher, the separation temperature that liquefies accordingly is lower, thereby produces LNG and need consume more energy than conventional gas.Traditional LNG device adopts single mix refrigerant compressor to produce cold; Because coke-oven gas rectifying tower tower top temperature is lower; As adopt azeotrope to make low-temperature receiver, not only iso-pentane or Trimethylmethane freeze owing to temperature is low easily in the refrigeration agent, and also possibly freeze like the too low wherein methane of temperature.As improve tower top temperature and then must improve raw gas pressure or reduce the methane extraction yield, cost is higher.
The utility model content:
The equipment of from coke-oven gas, producing liquify natural gas that the purpose of
the utility model is a kind of good reliability of proposition, efficient is high, working cost is low.
Above-mentioned purpose realizes through following technical scheme:
The equipment of liquify natural gas is produced in
from coke-oven gas, its composition comprises: be installed in the main heat exchanger in the ice chest, described main heat exchanger connects mix refrigerant compression refrigerating system and nitrogen pressure compressing refrigeration system respectively; The cat head of the rectifying tower that is connected by the road with described main heat exchanger is equipped with condensing surface; At the bottom of the tower of described rectifying tower reboiler is housed; Described condensing surface delivery conduit connects described main heat exchanger through supercooler and finally connects the fuel delivery conduit, and described reboiler connects liquefied natural gas storage vessel after connecting described supercooler by the road again.
described equipment of from coke-oven gas, producing liquify natural gas; Described mix refrigerant compression refrigerating system comprises the mix refrigerant compressor; Described mix refrigerant compressor is through the described main heat exchanger of mix refrigerant pipe connection; The pipe connection of the mix refrigerant of extracting out from the middle part of described main heat exchanger is to described reboiler; The described main heat exchanger of pipe connection from the mix refrigerant of described reboiler output comes out to be connected to described mix refrigerant compressor through the re-heat pipeline from ice chest again and forms circulation.
described equipment of from coke-oven gas, producing liquify natural gas; Described nitrogen pressure compressing refrigeration system comprises nitrogen compressor; The nitrogen compression pipe of described nitrogen compressor connects described main heat exchanger; Cooled gas piping connects condensing surface through throttling valve, and the nitrogen pipeline connection nitrogen compressor of exporting from condensing surface circulates.
Beneficial effect:
1. the utility model have two to overlap independently refrigeration system: mix refrigerant compression refrigerating system and nitrogen pressure compressing refrigeration system.The nitrogen pressure compressing refrigeration system is used to provide because the lower low temperature cold of rectifying tower top temperature, and its advantage is: nitrogen belongs to cryogenic fluid, and the low and easy freezing not of vaporization temperature makes in the tail gas methane content reduce thereby can improve the methane yield because tower top temperature is low; When variation of ambient temperature or regulate output need regulate the azeotrope proportioning time, the influence that the rectifying tower operating mode receives is less; Adopt the low temperature nitrogen compressor because suction nitrogen superheating temperature is little thereby refrigerating efficiency is high.According to the feed gas composition situation can determine to adopt pure nitrogen gas still be n-formyl sarcolysine alkane mixed gas to reduce the condensing surface temperature difference to greatest extent, cut down the consumption of energy.
the utility model is changed the mode that traditional single mix refrigerant refrigeration system is mixed refrigerant systems+nitrogen (or nitrogen-methane blended gas) compression refrigerating system; Promptly solved to coke(oven)gas liquefaction and separation system liquefying-point low; The higher shortcoming of freezing easily of Trimethylmethane or iso-pentane freezing point has improved efficient again and has cut down the consumption of energy in the single mixed refrigerant systems.Compression system is higher than gas at normal temperature compressor assembly efficient, and compressor size need not water cooler for a short time for low temperature nitrogen (or nitrogen-methane blended gas).
Description of drawings:
accompanying drawing 1 is the structural representation of the utility model.
Embodiment:
Embodiment 1:
The equipment of liquify natural gas is produced in
from coke-oven gas, its composition comprises: be installed in the main heat exchanger 1 in the ice chest, described main heat exchanger connects mix refrigerant compression refrigerating system and nitrogen pressure compressing refrigeration system respectively; The cat head of the rectifying tower 2 that is connected by the road with described main heat exchanger is equipped with condensing surface 3; Reboiler 4 is housed at the bottom of the tower of described rectifying tower; Described condensing surface delivery conduit connects described main heat exchanger through supercooler 5 and finally connects fuel delivery conduit 6, and described reboiler connects liquefied natural gas storage vessel 7 after connecting described supercooler by the road again.
Embodiment 2:
described equipment of from coke-oven gas, producing liquify natural gas; Described mix refrigerant compression refrigerating system comprises mix refrigerant compressor 8; Described mix refrigerant compressor is through the described main heat exchanger of mix refrigerant pipe connection; The pipe connection of the mix refrigerant of extracting out from the middle part of described main heat exchanger is to described reboiler; The described main heat exchanger of pipe connection from the mix refrigerant of described reboiler output comes out to be connected to described mix refrigerant compressor through the re-heat pipeline from ice chest again and forms circulation.
Embodiment 3:
described equipment of from coke-oven gas, producing liquify natural gas; Described nitrogen pressure compressing refrigeration system comprises nitrogen compressor 9; The nitrogen compression pipe of described nitrogen compressor connects described main heat exchanger; Cooled gas piping connects condensing surface through throttling valve, and the nitrogen pipeline connection nitrogen compressor of exporting from condensing surface circulates.
Working process:
utilize above-mentioned equipment from coke-oven gas, to produce the process of liquify natural gas: the coke(oven)gas after the purification is sent into main heat exchanger through pipeline and is cooled to-160 ℃ ~-175 ℃ entering rectifying tower middle parts by the cryogenic media that from the mix refrigerant compressor, backflowed and carries out rectifying, and the tower still obtains natural gas liquids and crosses through supercooler and be decompressed to storage tank pressure after cold and deliver in the normal pressure liquefied natural gas storage vessel and store; Top of tower is extracted the tail gas of hydrogen, carbon monoxide, nitrogen out and after supercooler heats up back the main heat exchanger re-heat, is seen off, and institute's chilling requirement is provided by the mix refrigerant compression refrigerating system at the bottom of the rectifying tower, and rectifying tower top institute chilling requirement is provided by the nitrogen pressure compressing refrigeration system.
described method of from coke-oven gas, producing liquify natural gas, employed mix refrigerant is mixed by methane, ethene, propane, Trimethylmethane and nitrogen in the described mix refrigerant compression refrigerating system.The mix refrigerant of cooling box gets into the mix refrigerant compressor under 0.28MPa; Be compressed into 3.5MPa and cool off the laggard main heat exchanger of going into; Mix refrigerant is extracted out under-70 ℃ ~-90 ℃ certain temperatures in main heat exchanger middle part; Get into the high-pressure rectification bottom reboiler as thermal source heating tower lower curtate LNG; High-pressure refrigerant is got back to main heat exchanger after being cooled to-95 ℃ ~-110 ℃, continues to be cooled to-157 ℃ of supercooled liquids after after throttling valve is decompressed to 0.33MPa cooling, each hot-fluid of cooling main heat exchanger by re-heat after cooling box get into the compression of mix refrigerant compressor cycle.
described method of from coke-oven gas, producing liquify natural gas, in the described nitrogen pressure compressing refrigeration system in employed working medium be that nitrogen or methane content account for 10% ~ 40% the nitrogen and the mixed gas of methane.Nitrogen is behind low temperature nitrogen compressor compresses to 3.5 ~ 4.0MPa; Get into the main heat exchanger middle part be cooled to-160 ℃ ~--behind 170 ℃ the supercooled liquid; Be decompressed to 0.4 ~ 0.5MPa through the liquid nitrogen throttling valve; For the low-pressure distillation tower evaporator overhead condenser provides low-temperature receiver, be heated after the evaporation loop compression after supercooler is overheated again.
Claims (3)
1. equipment of from coke-oven gas, producing liquify natural gas, its composition comprises: be installed in the main heat exchanger in the ice chest, it is characterized in that: described main heat exchanger connects mix refrigerant compression refrigerating system and nitrogen pressure compressing refrigeration system respectively; The cat head of the rectifying tower that is connected by the road with described main heat exchanger is equipped with condensing surface; At the bottom of the tower of described rectifying tower reboiler is housed; Described condensing surface delivery conduit connects described main heat exchanger through supercooler and finally connects the fuel delivery conduit, and described reboiler connects liquefied natural gas storage vessel after connecting described supercooler by the road again.
2. the equipment of from coke-oven gas, producing liquify natural gas according to claim 1; It is characterized in that: described mix refrigerant compression refrigerating system comprises the mix refrigerant compressor; Described mix refrigerant compressor is through the described main heat exchanger of mix refrigerant pipe connection; The pipe connection of the mix refrigerant of extracting out from the middle part of described main heat exchanger is to described reboiler; The described main heat exchanger of pipe connection from the mix refrigerant of described reboiler output comes out to be connected to described mix refrigerant compressor through the re-heat pipeline from ice chest again and forms circulation.
3. the equipment of from coke-oven gas, producing liquify natural gas according to claim 1 and 2; It is characterized in that: described nitrogen pressure compressing refrigeration system comprises nitrogen compressor; The nitrogen compression pipe of described nitrogen compressor connects described main heat exchanger; Cooled gas piping connects condensing surface through throttling valve, and the nitrogen pipeline connection nitrogen compressor of exporting from condensing surface circulates.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203604679U CN202265558U (en) | 2011-09-24 | 2011-09-24 | Device for producing liquefied natural gas from coke oven gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203604679U CN202265558U (en) | 2011-09-24 | 2011-09-24 | Device for producing liquefied natural gas from coke oven gas |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202265558U true CN202265558U (en) | 2012-06-06 |
Family
ID=46156365
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011203604679U Withdrawn - After Issue CN202265558U (en) | 2011-09-24 | 2011-09-24 | Device for producing liquefied natural gas from coke oven gas |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202265558U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102504900A (en) * | 2011-10-20 | 2012-06-20 | 辽宁哈深冷气体液化设备有限公司 | Equipment for preparing liquefied natural gas (LNG) from coke oven gas and method thereof |
| CN103277979A (en) * | 2013-06-08 | 2013-09-04 | 中煤科工集团重庆研究院 | Deacidifying device in low-concentration oxygen-bearing coal bed gas copious cooling rectification treatment process |
-
2011
- 2011-09-24 CN CN2011203604679U patent/CN202265558U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102504900A (en) * | 2011-10-20 | 2012-06-20 | 辽宁哈深冷气体液化设备有限公司 | Equipment for preparing liquefied natural gas (LNG) from coke oven gas and method thereof |
| CN102504900B (en) * | 2011-10-20 | 2016-08-17 | 辽宁哈深冷气体液化设备有限公司 | The Apparatus and method for of liquified natural gas is produced from coke-stove gas |
| CN103277979A (en) * | 2013-06-08 | 2013-09-04 | 中煤科工集团重庆研究院 | Deacidifying device in low-concentration oxygen-bearing coal bed gas copious cooling rectification treatment process |
| CN103277979B (en) * | 2013-06-08 | 2015-06-17 | 中煤科工集团重庆研究院有限公司 | Deacidifying device in low-concentration oxygen-bearing coal bed gas copious cooling rectification treatment process |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20120606 Effective date of abandoning: 20120618 |
|
| C20 | Patent right or utility model deemed to be abandoned or is abandoned |