CN207280081U - The energy-saving production system of high-purity special gas based on LNG cold energy - Google Patents
The energy-saving production system of high-purity special gas based on LNG cold energy Download PDFInfo
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- CN207280081U CN207280081U CN201721333022.5U CN201721333022U CN207280081U CN 207280081 U CN207280081 U CN 207280081U CN 201721333022 U CN201721333022 U CN 201721333022U CN 207280081 U CN207280081 U CN 207280081U
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Abstract
A kind of cryogenic rectification field and the energy-saving production system of high-purity special gas in LNG cold energy uses field, including raw material gas purifying system, LNG cold energy recovery systems, high-purity gas piece-rate system, product storage sub-packaging system, waste product gas processing system, LNG cold energy recovery systems include condensing heat-exchange module, product low-temperature storage heat exchange module, exhaust gas cryogenic trapping heat exchange module and unstripped gas precooling module at the top of rectifying column.In the utility model, LNG cold energy can be utilized to produce high-purity special gas, general refrigerating cycle and equipment are substituted using LNG cold energy, can significantly simplification of flowsheet, the energy consumption of high-purity special gas is saved, is adapted to the LNG receiving stations of various scales, distributed point to supply station, multiple product can also be purified at the same time in different warm areas, achieve the purpose that LNG cold energy Multi-class propagations, improve total energy approach rate.The utility model is designed reasonably, it is simple in structure, suitable for the optimization design of high-purity special gas production equipment.
Description
Technical field
A kind of technique that the utility model is related to cryogenic rectification field and LNG cold energy uses field, and in particular to Yi Zhongli
Special gas is separated into the production system of high-purity (or ultra-pure) product with LNG cold energy.
Background technology
In recent years, LNG import volumes in China were rapidly increasing, and east and multiple coastal cities start or completed successively
The construction of LNG receiving stations, downstream user is supplied to by pipe network is inputted after LNG vaporization.In this process, -162 DEG C of LNG sheets
The distinctive high-quality cold energy of body receives more and more attention, to its high efficiente callback using with important energy conservation and environmental protection meaning and again
Big economic value.Currently plan and build LNG cold energy uses project include air separation, low-temperature electricity-generating, cold storage warehouse,
Rubber pulverizing, dry ice manufacture, sewage disposal and freeze-drying etc..But these projects, largely belong to low value-added technology
Industry, can only lean on expansion scale to lift economic benefit.
High-purity special gas, includes but not limited to high pure electronic gas (such as CF4, inert gas), graphene carbon source
(CH4 etc.), isotope gas is (such as13CO etc.), these products are in graphene industry, electronics and information industry, aerospace, advanced doctor
The fields such as treatment have boundless application market, while have very high economic value.With new materials such as graphenes and
The fast development of semiconductor manufacturing industry, the purity requirement to gas are also higher and higher.But the correspondingly, production of high-purity special gas
Technique and technical barrier are higher, and investment is larger, and especially energy consumption is also very high, and manufacturer is mainly that France's liquefaction is empty at present
Gas, German woods moral, US Air gasification work, the several large-scale gas companies of Praxair and Japan.Tradition is replaced using LNG cold energy
Cryogenic refrigeration circulation or liquid nitrogen in distillation system, can reduce equipment investment and energy consumption, production cost is greatly reduced；At the same time can
With the high-purity gas product for different boiling, the purifying technique of different warm areas is designed, realizes that the multi-temperature zone step of LNG cold energy is sharp
With raising LNG cold energy use rates, have very big economic benefit and social benefit.
Found through being retrieved to prior art literature, many on the cold applicable technical patents of LNG both at home and abroad, partial monopoly
Relate to the use of LNG cold energy separation gas, but the method and apparatus for not relating to high-purity gas rectifying.Chinese Patent Application No.
" full-liquid air separation device for utilizing LNG cold energy " disclosed in CN201010184299.2, describes one kind by LNG cold energy
The nitrogen cycle refrigeration system of low temperature compression is carried out, circulation cold is imported in air separation column and achievees the purpose that to separate liquid oxygen and nitrogen.
But whole flow process is separated only for air, and complex process, the purity requirement of product gas is relatively low, phase is produced with high-purity gas
Than the requirement to technique and device has larger difference.It has also been found that Chinese Patent Application No. CN201410277359.3 in retrieval
Disclosed " a kind of efficient air separation unit using cold energy of liquefied natural gas " improves the technique of previous item patent, not only
Using the cold energy liquefied air of LNG deep cooling warm areas, while with the cold energy cooling air compressor shaft of high temperature warm area, so as to further carry
The high comprehensive utilization ratio of cold energy, but still differ larger with high-purity gas production technology.And Chinese Patent Application No. is
" light hydrocarbon deep cooling separating method based on LNG cold energy " disclosed in CN201310320434.5, directly replaces tradition using LNG cold energy
The cold of three stage compression kind of refrigeration cycle, eliminates Partial shrinkage machine and expanding machine, simplifies equipment and flow, and makes LNG cold
It can be fully used.But this patent only improves the cold energy matching of traditional lighter hydrocarbons separating technology, specially for refining
The cryogenic separation of factory's dry gas and ethene cracking gas, is not directed to other special gases, is also not directed to high-pure gas distillation technology
And system.In addition upstream raw material gas needs refinery to provide, and cold energy used needs Large LNG receiving station to coordinate, limiting factor
It is a lot of, it is not appropriate for the cold energy use project as medium-sized and small-sized LNG satellite gasification stations station.
The content of the invention
The purpose of this utility model is that in view of the deficiencies of the prior art, there is provided one kind using LNG cold energy production it is high-purity (or
It is ultra-pure) the energy-saving technique of special gas, technology utilization LNG cold energy substitutes general refrigerating cycle and equipment, can be significantly simple
Change technological process, save the energy consumption of high-purity special gas, be adapted to the LNG receiving stations of various scales, distributed point to supply station.Should
Technique can also purify multiple product at the same time in different warm areas, and cascade utilization LNG cold energy, improves integrated energy efficiency.This practicality
New another important feature is, for the high added value advantage using high-purity special gas product, instead of traditional extensive style
LNG cold energy industries, lift the economic benefit of LNG cold energy uses.
The utility model is achieved through the following technical solutions, and the utility model includes：Raw material gas purifying system,
LNG cold energy recovery systems, high-purity gas piece-rate system, product storage sub-packaging system, the most of composition of waste product gas processing system five；
Unstripped gas is sloughed after partial impurities reach follow-up equipment requirement by raw material gas purifying system, is carried into high-purity piece-rate system
Pure, the high purity product of acquisition stores sub-packaging system by product and is stored and dispensed, and is enriched with the waste product gas of impurity then by useless
Product gas processing system is handled；Wherein, LNG cold energy recovery systems, cold is provided for whole flow process, except in raw material gas purifying system
Unstripped gas is carried out outside precooling in system, cold is also delivered to high-purity gas piece-rate system, product storage sub-packaging system respectively, is given up
Three parts of product gas processing system, for its provide needed for cold energy.In the utility model, five most concrete structures are as follows：
First, raw material gas purifying system
Raw material gas purifying system includes raw material after raw material gas storage tank, purification before preliminary clearning device, online detection instrument, purification
Gas storage tank.
The type and quantity of preliminary clearning device, component and purity depending on unstripped gas.For low-purity (3N to 5N)
Unstripped gas, purifier include the equipment such as chemical subtraction and physical absorption, for removing the material for being easy to absorb absorption, as CO2,
The impurity such as H2O, and solid particulate matter, make its total content be less than 1ppm, ensure the quality of final products.And for higher degree
The unstripped gas of (5N to 8N), purifier then only needs some minifilters, even without filter plant, you can reaches pretreatment
Purity requirement.
Online detection instrument, including chromatograph, dew point hygrometer, the detection device of other special compositions, and flow pass
Sensor, temperature sensor, and pressure sensor, for detecting, monitoring purity, flow, temperature, the pressure of key component.
Raw material gas storage tank after raw material gas storage tank, purification, for the pressure vessel with pressure reducing valve, purifies for storing before purification
Front and rear unstripped gas.
2nd, LNG cold energy recovery systems
Condensing heat-exchange module, product low-temperature storage heat exchange module, exhaust gas at the top of LNG cold energy recovery systems, including rectifying column
Cryogenic trapping heat exchange module, unstripped gas precooling module, and corresponding adiabatic connecting line.
Condensing heat-exchange module is a cryogen heat exchanger at the top of rectifying column, can be board-like, plate-fin or other forms.Should
Heat exchanger cold side connects low temperature LNG pipelines, and hot side is provided with temperature control modules, is integrally placed inside rectifying column tower top, as
Rectifying column condenser.When flow of feed gas is through heat exchanger hot side in tower, cold is passed to tower unstripped gas by low temperature LNG, and in temperature
It is set to maintain specified temp under the action of control module.
Product low-temperature storage heat exchange module is a cryogenic heat exchanger, is coil pipe or other forms.The heat exchanger is cold using LNG
The wall temperature of ultra-pure product storage tank can be maintained below product boiling point, facilitate it to store in liquid form.
Waste product gas cryogenic trapping heat exchange module is a cryogenic heat exchanger, can be plate-fin or other forms.Heat exchanger profit
It is convenient to concentrate trapping processing by the waste product air cooling of rectifying column discharge to liquid with LNG cold energy.
Unstripped gas precooling module is a cryogenic heat exchanger, can be plate-fin or other forms.The heat exchanger cold side is low temperature
LNG, hot side are room temperature unstripped gas.Flow of feed gas is through the heat exchanger, after being down to required precooling temperature, by the charging in the middle part of rectifying column
Mouth enters in tower.
3rd, high-purity gas piece-rate system
High-purity gas piece-rate system, for the technique core apparatus, including high-purity distillation tower and its temperature, pressure, flow, liquid
Level controlling system.
High-purity distillation tower, is placed in high-vacuum insulation structure.
In high-purity distillation tower, purer precooling unstripped gas enters from feed inlet in the middle part of tower, by cold at the top of rectifying column
Solidifying heat exchange module, is liquefied after absorbing LNG colds, is collected to along inner-tower filling material at tower bottom reboiler, after partial raw gas gasification
Rise, dynamic balance state is formed in tower with dirty unstripped gas, high purity liquid (gas) production is can extract out from bottom of towe (tower top)
Product, and it is proposed that waste product gas (liquid) body from opposite side.It is with traditional rectifying column difference, its internal high precision machining, is filled out
Expect function admirable, so as to form continual and steady high-precision temperature, barometric gradient field, as temperature gradient up to 0.01 DEG C/
M, the separation for ultra-high purity product provide condition.
4th, product storage sub-packaging system
Product storage sub-packaging system include high purity liquid product storage tank, air vaporizers, high-pressure gaseous product storage tank and
Supporting packing pipeline.High purity liquid product is extracted from the bottom of high-purity distillation tower, into high purity liquid product storage tank, storage tank
Outer wall absorbs LNG cold energy, maintains its internal temperature to be less than product boiling point through product low-temperature storage heat exchange module.It is high-purity when needing
During gas products, high purity liquid product storage tank valve is opened, product is after air vaporizers gasify, into high-pressure gaseous product
Storage tank is stored, then is transported to downstream user.
5th, waste product gas processing system
Waste product gas processing system, including waste product gas trap receptacle and pipeline.The waste product gas of impurity is enriched with through high-purity distillation
After top of tower outflow, by waste product gas cryogenic trapping heat exchange module, liquefy after absorbing LNG colds, then waste product is entered by pipeline
Gas trap receptacle carries out subsequent treatment.Waste product gas trap receptacle is a low-temperature pressure container.
Compared with prior art, the utility model has the advantages that：
First, flow is simple：LNG cold energy is used to separate high-purity special gas, can instead of general refrigerating cycle and equipment
To completely dispense with the large scale equipments such as expanding machine and compressor, so that significantly simplification of flowsheet；
Second, energy conservation and environmental protection：Using LNG cold energy rectifying, the energy consumption of high-purity special gas is not only greatlyd save, but also
Reduce LNG vaporization cost；
3rd, scalable, adaptability height：The modularized design of distillation system, makes it both to meet small-sized LNG vaporization
The demand stood, also can multiple module paralleling, make full use of the cold energy of large-scale Vaporizing Station, you can according to LNG receiving stations, the rule of Vaporizing Station
Mould is adjusted flexibly；
4th, can cascade utilization LNG cold energy：High-purity special gas is numerous in variety, can be preferably a variety of according to the height of boiling point
Target product, along LNG heating curves, carries out rectification and purification, such step technology pattern can be maximum respectively under different warm areas
Change utilizes LNG cold energy, improves capacity usage ratio；
5th, economic rate of return is high：Since ultra-pure special gas has very high added value, with traditional extensive style
LNG cold energy industries are compared, and are had the characteristics that small investment, cycle are short, return rate is high, are greatly improved the recovery value of LNG cold energy.
Brief description of the drawings
Fig. 1 is the overall structure diagram of the utility model；
Fig. 2 is the multi-level Product flow diagram of the utility model；
Wherein：1st, raw material gas purifying system, 2, pressure reducing valve, 3, high-purity gas piece-rate system, 4, product storage sub-packaging system,
5th, waste product gas processing system, 6, preliminary clearning device, 7, online detection instrument, 8, raw material gas storage tank before purification, 9, at the top of rectifying column
Condensing heat-exchange module, 10, product low-temperature storage heat exchange module, 11, exhaust gas cryogenic trapping heat exchange module, 12, the pre- chill of unstripped gas
Block, 13, high-purity distillation tower, 14, high purity liquid product storage tank, 15, air vaporizers, 16, high-pressure gaseous product storage tank, 17, useless
Product gas trap receptacle, 18, raw material gas storage tank before purification, 19, reboiler.
Embodiment
Elaborate below to the embodiment of the utility model, the present embodiment using technical solutions of the utility model before
Put and implemented, give detailed embodiment and specific operating process, but the scope of protection of the utility model is unlimited
In following embodiments, any one skilled in the art in the open scope of the utility model patent, according to
The technical solution of the utility model and its patent of invention design are subject to equivalent substitution or the form of change, in the utility model
Within protection domain.
Embodiment
LNG satellite stations sum is more than 600, and scale is differed from 50 cubic metres/day to 5000 cubic metres/day, wherein most normal
See that scale between 200-500 cubic metres/day, is now illustrated by taking the amount of vaporization of 300 cubic metres/day as an example.
The purpose of the present embodiment is to utilize LNG cold energy, by CF4Unstripped gas (4-5N) purifies to ultra-high purity (9N).Analyze this
Unstripped gas, due to CF4Preparation process is reacted using carbon and fluorine, or carbon monoxide and the method for fluorine reaction, contains impurity in product：
Solid particle (carbon and dust) 30ppm, H2O 20ppm, CO40ppm, F210ppm.System is purified by the LNG cold energy in this patent
System, total impurities can drop below the level of 10ppb.
As shown in Figure 1, the utility model includes raw material gas purifying system 1, pressure reducing valve 2, high-purity gas piece-rate system 3, production
Product storage sub-packaging system 4, waste product gas processing system 5, preliminary clearning device 6, online detection instrument 7, purification before raw material gas storage tank 8,
Condensing heat-exchange module 9, product low-temperature storage heat exchange module 10, exhaust gas cryogenic trapping heat exchange module 11, unstripped gas at the top of rectifying column
It is precooling module 12, high-purity distillation tower 13, high purity liquid product storage tank 14, air vaporizers 15, high-pressure gaseous product storage tank 16, useless
Raw material gas storage tank 18, reboiler 19 after product gas trap receptacle 17, purification.
Raw material gas purifying system 1, effect are to reduce impurity concentration, to reach ultra-pure rectifying column inlet purity requirement, in advance
Purifier 6, online detection instrument 7, purification before raw material gas storage tank 8, purification before raw material gas storage tank 18, unstripped gas precooling module
12.Wherein：Preliminary clearning device 6 includes using the equipment such as chemical subtraction and physical absorption, by solid particle and H2O content is down to
0.1ppm, by gaseous impurity CO, F21ppm or so is reduced to Deng total content, and gas-chromatography is included by online detection instrument 7
Instrument etc.) gas componant is detected in real time, if not reaching purity requirement, continue to be passed through preliminary clearning device 6, until reaching standard
Afterwards, raw material gas storage tank 18 after unstripped gas is stored to purification.Before low temperature high-purity distillation is carried out, raw material gas storage tank 18 after purification
In normal temperature and pressure unstripped gas through unstripped gas precooling module 12, exchange heat, reach with the natural gas (- 160 DEG C) of colder temperature
Precooling saturation temperature (- 127.8 DEG C or so).
High-purity gas piece-rate system 3, effect are the physical methods with cryogenic rectification, by the relatively low CO of unstripped gas mid-boiling point (-
191.5℃)、F2The higher CF of (- 188.1 DEG C) and boiling point4(- 127.8 DEG C) are separated.Purer precooling unstripped gas is from height
Pure 13 middle part feed inlet of rectifying column enters, and by condensing heat-exchange module 9 at the top of rectifying column, absorbs low temperature LNG (- 160 DEG C or so)
Cold after be liquefied, be collected to along inner-tower filling material at tower bottom reboiler 19, partial raw gas vaporization after rise, with dirty raw material
Gas forms dynamic balance state in tower, i.e. bottom of towe is enrichment CF4The cryogenic liquid of (slightly below -127.8 DEG C), tower top enrichment are miscellaneous
The cryogenic gas (slightly above -127.8 DEG C) of matter.Ultra-pure 0.01 DEG C of rectifying column internal temperature control precision, pressure controling precision
10Pa, ensures that unstripped gas has highly stable dynamic balance state, in this case, can extract out from bottom of towe pure in tower
Spend the CF for 99.9999999%4Fluid product, and it is proposed that the high waste product gas of impurity content from tower top.
Product stores sub-packaging system 4, and effect is by high-purity C F4Fluid product is stored in low-temperature condition, and when needed
It is vaporized filling, including product low-temperature storage heat exchange module 10, high purity liquid product storage tank 14, air vaporizers 15, high pressure
Gaseous product storage tank 16.High-purity CF4Fluid product is extracted from 19 bottom of reboiler, into high purity liquid product storage tank 14, storage
Tank wall absorbs LNG (- 160 DEG C) cold energy through product low-temperature storage heat exchange module 10, maintains its internal temperature to be less than CF4Boiling point (-
127.8℃).When needing high-purity gas product, 14 valve of high purity liquid product storage tank is opened, product passes through air vaporizers 15
After vaporization, stored, then transported to downstream user into high-pressure gaseous product storage tank 16.
Waste product gas processing system 5, effect are to collect processing exhaust gas, prevent from damaging and environmental pollution, including waste product gas
Trap receptacle 17 and associated ping.The waste product gas of impurity is enriched with after the outflow of the top of high-purity distillation tower 13, passes through exhaust gas low temperature
Trapping heat exchange module 11 absorb LNG (- 160 DEG C) cold after liquefy, then by pipeline enter waste product gas trap receptacle 17 carry out after
Continuous processing.Waste product gas trap receptacle 17 is a low-temperature pressure container.
Claims (5)
1. a kind of energy-saving production system of high-purity special gas based on LNG cold energy, it is characterised in that including raw material gas purifying system
Unite (1), LNG cold energy recovery systems, high-purity gas piece-rate system (3), product store sub-packaging system (4) and waste product gas processing system
(5)；
Raw material gas purifying system (1) includes raw material gas storage tank (8) before preliminary clearning device (6), online detection instrument (7), purification, net
Raw material gas storage tank (18) after change, the middle outflow of raw material gas storage tank (8) is stored in unstripped gas after preliminary clearning device (6) before cleaning
After purification in raw material gas storage tank (18), online detection instrument (7) is connected with preliminary clearning device (6), and unstripped gas stores up before cleaning
After tank (8), purification a pressure reducing valve (2) is respectively arranged in the downstream pipe of raw material gas storage tank (18)；
LNG cold energy recovery systems include condensing heat-exchange module (9) at the top of rectifying column, product low-temperature storage heat exchange module (10), give up
Gas cryogenic trapping heat exchange module (11) and unstripped gas precooling module (12)；Condensing heat-exchange module (9) is low temperature stream at the top of rectifying column
Body heat exchanger, heat exchanger cold side connection low temperature LNG pipelines, hot side are provided with temperature control modules, are integrally placed at rectifying tower
Top is internal, as rectifying column condenser；Product low-temperature storage heat exchange module (10) is cryogenic heat exchanger, is arranged in high purity liquid production
The bottom of product storage tank；Exhaust gas cryogenic trapping heat exchange module (11) is cryogenic heat exchanger, is serially connected in condensing heat-exchange mould at the top of rectifying column
On pipeline between block (9) and waste product gas trap receptacle (17)；Unstripped gas precooling module (12) is cryogenic heat exchanger, is serially connected in net
On pipeline after change between raw material gas storage tank (18) and high-purity distillation tower (13) feed inlet；
High-purity gas piece-rate system (3) includes high-purity distillation tower (13), reboiler (19), and reboiler (19) is arranged in high-purity distillation
The bottom of tower (13), purer precooling unstripped gas enter from feed inlet in the middle part of tower；
Product storage sub-packaging system (4) includes high purity liquid product storage tank (14), air vaporizers (15), the storage of high-pressure gaseous product
Tank (16), high purity liquid product storage tank (14) are connected by pipeline with reboiler (19), and air vaporizers (15) are serially connected in height
On pipeline between neat liquid product storage tank (14), high-pressure gaseous product storage tank (16), height is serially connected in air vaporizers (15)
One pressure reducing valve (2) is installed on the pipeline between neat liquid product storage tank (14)；
Waste product gas processing system (5) includes waste product gas trap receptacle (17), and waste product gas trap receptacle (17) passes through pipeline and rectifying
Top of tower condensing heat-exchange module (9) is connected.
2. high-purity special gas energy-saving production system according to claim 1 based on LNG cold energy, it is characterised in that
For the unstripped gas of low-purity (3N to 5N), preliminary clearning device (6) includes chemical subtraction and physisorption apparatus；For more high-purity
The unstripped gas of (5N to 8N) is spent, preliminary clearning device (6) only includes minifilters.
3. high-purity special gas energy-saving production system according to claim 2 based on LNG cold energy, it is characterised in that
The online detection instrument (7) includes chromatograph, dew point hygrometer, flow sensor, temperature sensor, and pressure sensing
Device.
4. high-purity special gas energy-saving production system according to claim 3 based on LNG cold energy, it is characterised in that
Condensing heat-exchange module (9) is board-like or plate-fin cryogen heat exchanger at the top of rectifying column, product low-temperature storage heat exchange module
(10) it is coiled cryogenic heat exchanger, waste product gas cryogenic trapping heat exchange module (11), unstripped gas precooling module (12) are plate wing
Formula cryogenic heat exchanger.
5. high-purity special gas energy-saving production system according to claim 4 based on LNG cold energy, it is characterised in that
The high-purity distillation tower (13) is placed in high-vacuum insulation structure.
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