CN203489577U - Preparation system for methane - Google Patents
Preparation system for methane Download PDFInfo
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- CN203489577U CN203489577U CN201320580904.7U CN201320580904U CN203489577U CN 203489577 U CN203489577 U CN 203489577U CN 201320580904 U CN201320580904 U CN 201320580904U CN 203489577 U CN203489577 U CN 203489577U
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Abstract
The utility model discloses a preparation system for methane. The preparation system comprises a feed gas purification unit, a refrigeration compression unit, a liquefaction unit and an LNG storage unit. The feed gas purification unit is used for conducting the purification operation on feed gas and conveying the purified gas to the liquefaction unit for the liquefaction operation. The refrigeration compression unit is used for conducting the pressurization cooling operation on nitrogen and conveying the low-temperature gas obtained after expansion refrigeration to the liquefaction unit. The liquefaction unit is used for receiving the feed gas from the purification operation and the low-temperature gas from the compression operation, controlling the feed gas to be cooled by the low-temperature gas for the separation operation, and conveying LNG at the separation position for the storage operation. By means of the preparation system for methane, a method for recycling LNG in tail gas and preparing LNG is applied, the energy-saving measures of an enterprise can be effectively taken, the resource consumption of the enterprise is reduced, and comprehensive energy utilization of the enterprise is improved.
Description
Technical field
The utility model relates to the recovery technology field of liquefied natural gas and methane, especially a kind of preparation system of methane.
Background technology
At present, along with improving constantly of people's living standard, for the utilization of the energy also age different from the past, so, the energy-saving and cost-reducing of the energy all advocated in a lot of areas energetically now, reduces the loss of the energy, increases the utilization ratio of the energy, the descendants that not only can better bring benefit to the mankind, has responded the guiding theory of country about sustainable development especially energetically.Investigation demonstration, the methane concentration in atmosphere has increased more than one times for many years, mainly by mankind's activity, is caused.The energy force rate carbon dioxide that methane stops heat to distribute from atmosphere is high 23 times, and therefore reducing discharge of methane and reclaiming in time methane is to solve the good approach that global warming issue can take effect in a short time.
Wherein, recycle methane as clean energy resource, can not only reduce global discharge of methane, also promote the production safety coefficients such as colliery, improve local air quality.The methane marketization is the new period mankind's a wise selection, for consolidating economic growth, promote energy security, improving environment and reduce greenhouse gas emission, is all a thing being highly profitable.In prior art, for film, carry in hydrogen tail gas and do not carry out a well recycling, the methane recovery operation of especially carrying in hydrogen tail gas for film does not have an effective way.
Utility model content
The technical problem that the utility model solves is to provide a kind of preparation system of methane, can in tail gas, reclaim and prepare the method for methane, can effectively improve the conservation measures of enterprise, reduces the resource consumption of enterprise, improves the comprehensive utilization of energy of enterprise.
For solving the problems of the technologies described above, the utility model provides a kind of preparation system of methane, it is characterized in that; Comprise unstripped gas purification unit, refrigerant compression unit, liquefaction unit, LNG storage element; Wherein,
Unstripped gas purification unit, for unstripped gas is carried out to purification run, and flows to liquefaction unit by purified gas and carries out Operation for liquefaction; Wherein, described unstripped gas purification process adopts drying tower and filter to realize; After described unstripped gas drying tower, remove H
2o enters Operation for liquefaction after filter carries out dust pretreatment;
Refrigerant compression unit, for nitrogen is carried out to supercharging cooling down operation, and is delivered to liquefaction unit by the cryogenic gas after swell refrigeration; Wherein, described refrigerant compression operation adopts compressor, cooler and surge tank to realize; Described nitrogen, after nitrogen buffer tank carries out buffer operation, enters compressor and carries out boost operations, enters cooler and carry out cooling down operation after boost operations completes, and coldly goes the cryogenic gas after operation to be delivered to Operation for liquefaction and to use as cold-producing medium
Liquefaction unit, for receiving from the unstripped gas of purification run with from the cryogenic gas of squeeze operation; Control unstripped gas and after cryogenic gas is cooling, carry out lock out operation, and the LNG of separation place is flowed to store operation; Wherein, described Operation for liquefaction adopts heat exchanger, knockout drum and rectifying column to realize; Described unstripped gas carries out cooling down operation under the effect of described cryogenic gas, and entering knockout drum after cooling carries out lock out operation, and the gas of sub-department enters after rectifying column from tower top output hydrogen and nitrogen, from output LNG product at the bottom of tower and flow to store operation;
LNG storage element, for storing the LNG of Operation for liquefaction output to reclaim;
Wherein, the control mode that described unstripped gas purification process, refrigerant compression operation, Operation for liquefaction, LNG store operation adopt is for controlling on the spot the control mode combining with Central Control Room Long-distance Control, and Central Control Room is controlled and adopted DCS control system; Wherein, measurement and control operation, the operation of stopping in emergency are all carried out in described Central Control Room; Device parameter and running state parameter show in Central Control Room DCS display unit, go forward side by side line item and corresponding alarm operation; The operation of device start that described operation relates to is carried out with control mode on the spot.
The utility model technique scheme has following beneficial features:
The utility model can reclaim and prepare the method for methane by technique scheme in tail gas, can effectively improve the conservation measures of enterprise, reduces the resource consumption of enterprise, improves the comprehensive utilization of energy of enterprise; By CH in the final LNG obtaining of technique scheme
4purity:>=98% (V/V).
The application's further feature and advantage will be set forth in the following description, and, partly from description, become apparent, or understand by implementing the application.The application's object and other advantages can be realized and be obtained by specifically noted structure in description, claims and accompanying drawing.
Accompanying drawing explanation
Fig. 1 is the structural representation of the utility model embodiment.
The specific embodiment
For making the purpose of this utility model, technical scheme and advantage clearer, hereinafter will be elaborated to embodiment of the present utility model.It should be noted that, in the situation that not conflicting, embodiment and the feature in embodiment in the application can be combined mutually.
The utility model provides a kind of preparation technology of methane, comprises unstripped gas purification process, refrigerant compression operation, Operation for liquefaction, LNG store operation; Wherein,
Unstripped gas purification process, for unstripped gas is carried out to purification run, and flows to liquefaction unit by purified gas and carries out Operation for liquefaction;
Refrigerant compression operation, for nitrogen is carried out to supercharging cooling down operation, and is delivered to liquefaction unit by the cryogenic gas after swell refrigeration;
Operation for liquefaction, for receiving from the unstripped gas of purification run with from the cryogenic gas of squeeze operation; Control unstripped gas and after cryogenic gas is cooling, carry out lock out operation, and the LNG of separation place is flowed to store operation;
LNG store operation, for storing the LNG of Operation for liquefaction output to reclaim;
Wherein, the control mode that the said method that the utility model provides adopts in practical operation is for controlling on the spot the control mode combining with Central Control Room Long-distance Control, and Central Control Room is controlled and adopted DCS control system.
Measurement and control operation in above-mentioned each operation that the utility model provides are all carried out in Central Control Room, and the operation of stopping in emergency is also carried out in Central Control Room; The device parameter that each operating unit relates to and running state parameter show in Central Control Room DCS display unit, go forward side by side line item and corresponding alarm operation.Wherein, the device start of unit carries out with control mode on the spot, carries out at the scene start-up operation.
Accordingly, the utility model provides a kind of preparation system of methane, as shown in Figure 1, comprises unstripped gas purification unit, refrigerant compression unit, liquefaction unit, LNG storage element; Wherein,
Unstripped gas purification unit, for unstripped gas is carried out to purification run, and flows to liquefaction unit by purified gas and carries out liquefaction unit;
Refrigerant compression unit, for nitrogen is carried out to supercharging cooling down operation, and is delivered to liquefaction unit by the cryogenic gas after swell refrigeration;
Liquefaction unit, for receiving from the unstripped gas of clean unit with from the cryogenic gas of compression unit; Control unstripped gas and after cryogenic gas is cooling, carry out lock out operation, and the LNG of separation place is flowed to storage element;
LNG storage element, for storing the LNG of liquefaction unit output to reclaim;
Wherein, the control mode that the said method that the utility model provides adopts in actual cell is for controlling on the spot the control mode combining with Central Control Room Long-distance Control, and Central Control Room is controlled and adopted DCS control system.
Measurement and control operation in the above-mentioned unit that the utility model provides are all carried out in Central Control Room, and the operation of stopping in emergency is also carried out in Central Control Room; The device parameter that unit relates to and running state parameter show in Central Control Room DCS display unit, go forward side by side line item and corresponding alarm operation.Wherein, the device start of unit carries out with control mode on the spot, carries out at the scene device start operation.
In concrete operations, the technique scheme technological process that the utility model provides specifically describes as follows:
This project adopts proposes to being rich in the film of CH4 the technological process that hydrogen tail gas is purified and developed, and adopts nitrogen expanding refrigeration liquefaction technology, low-temperature fractionating tower isolation technics to produce highly purified LNG product.
Refrigeration system adopts single cycle refrigeration technique.Kind of refrigeration cycle technological process adopts nitrogen expansion refrigeration.Nitrogen, when compressor supercharging is cooled to 0.8MPaG, temperature to be 40 ℃, then enters ice chest and is cooled to-140 ℃, then enters after decompressor swell refrigeration obtains-185 ℃ of cryogenic gases and returns to liquefaction ice chest, precooling unstripped gas, liquefied methane.
In concrete operations, the process equipment and the corresponding operating that relate to are described below:
1, unstripped gas purification unit and unstripped gas purification process; First unstripped gas enters in molecular sieve dehydration drying device and meets after decontamination index requires and enter liquefaction unit; It is as follows that unstripped gas purification unit relates to equipment:
1) drying tower; Drying tower is mainly used to adsorb the micro-H2O in unstripped gas, prevents that H2O from stopping up plate-fin heat exchanger in low temperature process process.
Drying tower technical parameter is as follows:
Quantity: 2
Pattern: vertical
Working media: unstripped gas
Operating pressure: 3.8MPaG
Operating temperature: 35 ℃
Adsorbent pattern: 4A molecular sieve
Work period: 8h
Material: Q345R
Size: φ 1000 * 3000
2) regeneration gas heater; Regeneration gas heater is used for the gas that thermal regeneration molecular sieve is used.
Regeneration gas heater technical parameter is as follows:
Quantity: 1
Tube side medium: the warm steam of office
Tube side inlet temperature: press saturated vapor in 2.5MPaG
Tube side outlet temperature: condensed steam
Shell side medium: regeneration gas (rich nitrogen)
Operating pressure: 0.07MPaG
Shell side inlet temperature: 40 ℃
Outlet temperature: 240 ℃
Material: Q345R
3) piping filter; Filter is mainly used to filter the molecular sieve dust in preprocessing process; Prevent from entering aluminum plate-fin heat exchanger, stop up Cryo Equipment.
Filter technology parameter is as follows:
Quantity: 2
Pattern: vertical
Working media: unstripped gas
Operating pressure: 3.8MPaG
Operating temperature: 40 ℃
Filtering accuracy: 0.125mm
2, refrigerant compression unit and refrigerant compression operation; For nitrogen is carried out to supercharging cooling down operation, and be delivered to Operation for liquefaction by the cryogenic gas after swell refrigeration; Squeeze operation can comprise compressor, cooler and surge tank; Nitrogen, after nitrogen buffer tank carries out buffer operation, enters compressor and carries out boost operations, enters cooler and carry out cooling down operation after boost operations completes, and coldly goes the cryogenic gas after operation to be delivered to Operation for liquefaction and to use as cold-producing medium.
Preferably, in concrete operations, refrigerant compression operation is comprised of single cycle nitrogen compressor, water cooler and nitrogen buffer tank.Low-pressure nitrogen from ice chest heat exchanger enters nitrogen buffer tank, then enters nitrogen compressor and boosts to 0.8MPaG, then enters water cooler cooling, goes out that water cooler is laggard enters ice chest precooling, then enters expander refrigeration end.Mix refrigerant enters cold-producing medium surge tank, then enters cold-producing medium and presses
Wherein, refrigerant compression unit key equipment is that nitrogen compressor, its technical parameter are as follows:
Quantity: 1
Air inflow: 18000Nm3/h
Admission pressure (gauge pressure): 0.2MPaG
Intake air temperature: 36.4 ℃
Medium: nitrogen
Outlet pressure (gauge pressure): 0.8MpaG
Outlet temperature :≤40 ℃
Shaft power: 1750kW
3, liquefaction unit and Operation for liquefaction; For receiving from the unstripped gas of purification run unit with from the cryogenic gas of squeeze operation; Control unstripped gas and after cryogenic gas is cooling, carry out lock out operation, and the LNG of separation place is flowed to LNG store operation.
Liquefaction unit can adopt liquefaction ice chest, and wherein, liquefaction ice chest is comprised of equipment such as plate-fin heat exchanger, rectifying column, knockout drums.Unstripped gas is cooled to-160 ℃ in ice chest, and throttling flash separation goes out the laggard low-temperature fractionating tower T1301 of entering of gas.Tower top is isolated all hydrogen and nitrogen, from the LNG product of producing at the bottom of tower.
The technical parameter of liquefaction ice chest is as follows:
Quantity: 1
Appearance and size: 4 * 4 * 20m*m*m
Insulation pattern: pearlife
Heat-preserving range: wing heat exchanger, flash tank, rectifying column etc.
4, LNG storage element and LNG store operation; For the LNG of Operation for liquefaction output is stored and is reclaimed.Wherein, this project adopts LNG primary and secondary tank stores with pressure, and tank volume is 300m3, can meet the storage needs of 4 days full load LNG products.
LNG storage tank technical parameter is as follows:
Quantity: 1
Pattern: vertical
Working media: LNG
Operating pressure: 0.3MPaG
Operating temperature :-160 ℃
Design pressure: 0.5MPaG
Design temperature :-196 ℃
5, diffuse unit and diffuse operation; Waste gas cloud diffusing tower from the safety valve discharge in liquefaction unit is concentrated high altitude discharge; Diffuse unit and can comprise diffusing tower.
Diffusing tower technical parameter is as follows:
Diffuse medium: normal-temperature natural-gas
Designing and arranging is high-volume: 6000m3/h
Exhaust stack inlet pressure: 6-12kPa
Steam pressure: 0.2-0.4MPa
Caliber interface: DN50
Power Level: AC220/50Hz
Diffuse height :～40m
Earthquake intensity: 7 degree
6, control module and control operation; Preferably, the above-mentioned unit in the utility model adopts and controls on the spot the control mode combining with Central Control Room Long-distance Control; Wherein, Central Control Room is controlled and is adopted DCS control system.
Measurement and control operation in the above-mentioned unit that the utility model provides are all carried out in Central Control Room, and the operation of stopping in emergency is also carried out in Central Control Room; The device parameter of unit and running state parameter show in Central Control Room DCS display unit, go forward side by side line item and corresponding alarm operation.Wherein, the device start of unit carries out with control mode on the spot, carries out at the scene start-up operation.
The final LNG technical parameter obtaining of technique scheme providing by the utility model is as follows:
CH in LNG
4purity:>=98% (V/V) volume ratio;
LNG flow: 1313.9Nm3/h;
LNG temperature :-160 ℃;
LNG pressure: 0.2MpaA.
CH in the LNG liquefied natural gas that the technique scheme providing by the utility model finally obtains
4purity higher than the CH of preparation of the prior art
4purity; Easy to spread and implement.
Although the disclosed embodiment of the utility model as above, the embodiment that described content just adopts for the ease of understanding the utility model, not in order to limit the utility model.Technical staff under any the utility model in technical field; do not departing under the prerequisite of the disclosed spirit and scope of the utility model; can do any modification and variation what implement in form and in details; but scope of patent protection of the present utility model, still must be as the criterion with the scope that appending claims was defined.
Claims (1)
1. a preparation system for methane, is characterized in that; Comprise unstripped gas purification unit, refrigerant compression unit, liquefaction unit, LNG storage element; Wherein,
Unstripped gas purification unit, for unstripped gas is carried out to purification run, and flows to liquefaction unit by purified gas and carries out Operation for liquefaction;
Wherein, described unstripped gas purification process adopts drying tower and filter to realize; After described unstripped gas drying tower, remove H
2o enters Operation for liquefaction after filter carries out dust pretreatment;
Refrigerant compression unit, for nitrogen is carried out to supercharging cooling down operation, and is delivered to liquefaction unit by the cryogenic gas after swell refrigeration;
Wherein, described refrigerant compression operation adopts compressor, cooler and surge tank to realize; Described nitrogen, after nitrogen buffer tank carries out buffer operation, enters compressor and carries out boost operations, enters cooler and carry out cooling down operation after boost operations completes, and coldly goes the cryogenic gas after operation to be delivered to Operation for liquefaction and to use as cold-producing medium
Liquefaction unit, for receiving from the unstripped gas of purification run with from the cryogenic gas of squeeze operation; Control unstripped gas and after cryogenic gas is cooling, carry out lock out operation, and the LNG of separation place is flowed to store operation;
Wherein, described Operation for liquefaction adopts heat exchanger, knockout drum and rectifying column to realize; Described unstripped gas carries out cooling down operation under the effect of described cryogenic gas, and entering knockout drum after cooling carries out lock out operation, and the gas of sub-department enters after rectifying column from tower top output hydrogen and nitrogen, from output LNG product at the bottom of tower and flow to store operation;
LNG storage element, for storing the LNG of Operation for liquefaction output to reclaim;
Wherein, the control mode that described unstripped gas purification unit, refrigerant compression unit, liquefaction unit, LNG storage element adopt is for controlling on the spot the control mode combining with Central Control Room Long-distance Control, and Central Control Room is controlled and adopted DCS control system; Wherein, measurement and control operation, the operation of stopping in emergency are all carried out in described Central Control Room; Device parameter and running state parameter show in Central Control Room DCS display unit, go forward side by side line item and corresponding alarm operation; The operation of device start that described operating unit relates to is carried out with control mode on the spot.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320580904.7U CN203489577U (en) | 2013-09-21 | 2013-09-21 | Preparation system for methane |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320580904.7U CN203489577U (en) | 2013-09-21 | 2013-09-21 | Preparation system for methane |
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| CN203489577U true CN203489577U (en) | 2014-03-19 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104807286A (en) * | 2014-10-31 | 2015-07-29 | 刘继福 | Nitrogen liquefaction system allowing recycling of LNG (Liquefied Natural Gas) cold energy |
| CN108266963A (en) * | 2018-01-16 | 2018-07-10 | 中科睿凌江苏低温设备有限公司 | A kind of tail gas recycle prepares the device of liquefied natural gas |
-
2013
- 2013-09-21 CN CN201320580904.7U patent/CN203489577U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104807286A (en) * | 2014-10-31 | 2015-07-29 | 刘继福 | Nitrogen liquefaction system allowing recycling of LNG (Liquefied Natural Gas) cold energy |
| CN104807286B (en) * | 2014-10-31 | 2016-02-03 | 刘继福 | Recycle the nitrogen gas liquefaction system of LNG cold energy |
| CN108266963A (en) * | 2018-01-16 | 2018-07-10 | 中科睿凌江苏低温设备有限公司 | A kind of tail gas recycle prepares the device of liquefied natural gas |
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140319 Termination date: 20180921 |
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| CF01 | Termination of patent right due to non-payment of annual fee |