CN208829616U - Remove the process system of carbon dioxide in natural - Google Patents

Remove the process system of carbon dioxide in natural Download PDF

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Publication number
CN208829616U
CN208829616U CN201820991189.9U CN201820991189U CN208829616U CN 208829616 U CN208829616 U CN 208829616U CN 201820991189 U CN201820991189 U CN 201820991189U CN 208829616 U CN208829616 U CN 208829616U
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adsorption tower
gas
pipe
carbon dioxide
outlet
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CN201820991189.9U
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兰文旭
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02CCAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
    • Y02C20/00Capture or disposal of greenhouse gases
    • Y02C20/40Capture or disposal of greenhouse gases of CO2

Abstract

Remove the process system of carbon dioxide in natural.Traditional wet process removes carbon dioxide in natural, and process is complicated, and equipment is various, and hydramine reagent is toxic, and make-up solution and desalted water are needed in operation.The utility model composition includes: raw natural gas entrance, it is characterized in that: raw natural gas entrance by valve respectively with adsorption tower A(1), adsorption tower B(2), adsorption tower C(3) inlet tube connection, adsorption tower A, adsorption tower B, the outlet of adsorption tower C is connect by valve with purified natural gas pipe, purified natural gas pipe is connected by valve with each cold blowing inlet tube, each cold blowing outlet is connected with cold blowing Gas Cooler (7) inlet tube, cold blowing Gas Cooler outlet is connected with purified natural gas pipe, heater (5) outlet by valve respectively with adsorption tower A, adsorption tower B, adsorption tower C inlet tube is connected, circularly-supercharged machine outlet is connected with heater inlet pipe.The utility model is used to remove the process system of carbon dioxide in natural.

Description

Remove the process system of carbon dioxide in natural
Technical field:
The utility model relates to the natural gas preconditioning technique fields in liquefaction Technology of Natural Gas, and in particular to a kind of removing The process system of carbon dioxide in natural.
Background technique:
Natural gas is a kind of environmentally protective, economical and practical, safe and reliable high-grade energy, develops gas industry, naturally The research of gas purifying process is also particularly important in gas liquefaction technology, because of the relatively high-solidification point component such as titanium dioxide in natural gas Carbon, moisture and heavy hydrocarbon etc. can solidify in gas deliquescence process and occluding device, it is necessary to be removed before liquefaction;Tradition Wet process remove carbon dioxide in natural, process is complicated, and equipment is various, and hydramine reagent is toxic, needs to supplement in operation molten Liquid and desalted water.
Natural gas carbon dioxide removal processing method can be divided into wet process and two kinds of dry method, the development of wet process carbon dioxide removal more at Ripe and application is more for hydramine method, hydramine method have absorb, regenerated technique removing precision is relatively high, treating capacity is big, natural The advantages that gas methane high income, meets requirement of the LNG device to purified gas, but hydramine method process is complicated, and equipment is various, hydramine examination Agent is toxic, and needs make-up solution and desalted water in operation, and carbon dioxide removal process need to be separately positioned with dehydration procedure, for The regional applicability of water shortage or land used anxiety is bad;It can reach naturally in dry method carbon dioxide removal using temp.-change adsorptive process (TSA) Qi exhaustion carbon dioxide, dehydration and de- heavy hydrocarbon purpose, have process it is simple, it is easy to operate, corrosion-free and pollution, occupied area it is small, The low equal remarkable advantages of operating cost, but when single utilization routine temp.-change adsorptive process, because carbon dioxide is different from moisture in regeneration gas And heavy hydrocarbon, it can not be separated after cooling, cause this partial regeneration gas that can not recycle, be original with maximum resource utilization Then, regeneration gas can be used as distributed energy power generation.But in the occasion for not using distributed energy, this partial regeneration gas is wasted Fall, causes the LNG device natural gas methane rate of recovery not high, therefore conventional dry decarburization is not particularly suited for not using distributed energy The occasion in source.
Utility model content:
The purpose of the utility model is to provide a kind of process system for removing carbon dioxide in natural, system is simple, suitable With property is strong, methane recovery is high, technique using three towers (can also according to circumstances use two towers) temp.-changing adsorption (TSA) with it is circularly-supercharged Machine serial flow removes carbon dioxide in natural gas or other impurities.
Above-mentioned purpose is realized by following technical scheme:
A kind of process system removing carbon dioxide in natural, composition includes: raw natural gas entrance, the original Material gas inlet is connect with the inlet tube of adsorption tower A, adsorption tower B, adsorption tower C respectively by valve, adsorption tower A, adsorption tower B, the outlet of adsorption tower C is connect by valve with purified natural gas pipe, and purified natural gas pipe passes through valve and each cold blowing import Pipe is connected, and each cold blowing outlet is connected with cold blowing Gas Cooler inlet tube, cold blowing Gas Cooler outlet and purified natural gas pipe It is connected, heater outlet pipe is connected with adsorption tower A, adsorption tower B, adsorption tower C inlet tube respectively by valve, adsorption tower A, absorption The outlet tower B, adsorption tower C stove pipe is connected by valve with storage heater inlet tube, accumulator outlet pipe and circularly-supercharged machine into Mouth pipe is connected, and circularly-supercharged machine outlet is connected with heater inlet pipe.
The process system of the removing carbon dioxide in natural, the accumulator outlet pipe pass through valve and fuel The connection of gas surge tank inlet tube, the fuel gas surge tank outlet are connect with fuel gas pipe, and adsorption tower is de- in temperature-rise period A small amount of mixed gas of the carbon dioxide and natural gas that remove is as fuel.
The process system of the removing carbon dioxide in natural, the accumulator outlet pipe and regeneration Gas Cooler Inlet tube connection, the regeneration gas cooler outlet pipe are connect by valve with the raw natural gas pipe, and described follows Ring supercharger import is arranged purified gas and supplements pipeline.
The process system of the removing carbon dioxide in natural, it is the adsorption tower A, the adsorption tower B, described Adsorption tower C filler be molecular sieve, molecular sieve and active carbon multiple-hearth, molecular sieve and silica gel multiple-hearth or molecular sieve and active oxygen Change aluminium combination.
The utility model has the advantages that
1. the utility model is mainly to provide a kind of process system for removing carbon dioxide in natural, it is suitable for various days Right gas source, is particularly suitable for the less situation of carbon dioxide in natural gas content, solves and do not use distributed energy When routine temp.-change adsorptive process carbon dioxide removal can not efficiently use regeneration gas problem.
For the utility model mainly for the area of water shortage or land used anxiety, applicability is good, the recycling of LNG device natural gas methane Rate is high, while process of the invention is simple, investment is small, environmentally friendly, occupied area is small, has many advantages, such as easy to operate.
The utility model is increased in order to solve the problems, such as that regeneration gas is irretrievable in absorption method technique, by regeneration gas by circulation Press is by regeneration gas circulating-heating, so that absorption tower packing heating, increases precipitation with temperature in adsorption tower during heating Natural gas containing carbon dioxide enters fuel surge tank, lets out the adsorption tower in heated condition when heating closes to an end Adsorption tower is included foreign gas and leaks into fuel surge tank by pressure, and absorption tower pressure interior force is only slightly higher than fuel surge tank, rises again later Pressure, this measure greatly reduce out the flow of system regeneration gas, and the adsorption tower in heated condition after boosting still remains a small amount of The impurity such as carbon dioxide restart circulating-heating process and heat gas are imported regeneration to reach further purification purpose Raw material tracheae is incorporated to after Gas Cooler is cooling and enters adsorption process, to ensure that these fraction of impure gases will not be in cold blowing Bring next procedure in journey into.
Detailed description of the invention:
Attached drawing 1 is the flowage structure schematic diagram of the utility model.
Wherein: 1, adsorption tower A, 2, adsorption tower B, 3, adsorption tower C, 4, circularly-supercharged machine, 5, heater, 6, accumulation of heat Device, 7, cold blowing Gas Cooler, 8, regeneration Gas Cooler, 9, fuel gas surge tank.
Specific embodiment:
Embodiment 1:
A kind of process system removing carbon dioxide in natural, composition includes: raw natural gas entrance, the original Material gas inlet is connect with the inlet tube of adsorption tower A1, adsorption tower B2, adsorption tower C3 respectively by valve, adsorption tower A, absorption Tower B, adsorption tower C outlet connect with purified natural gas pipe by valve, purified natural gas pipe pass through valve and each cold blowing into Mouth pipe is connected, and each cold blowing outlet is connected with 7 inlet tube of cold blowing Gas Cooler, cold blowing Gas Cooler outlet and purified natural gas Pipe is connected, and 5 outlet of heater is connected with adsorption tower A, adsorption tower B, adsorption tower C inlet tube respectively by valve, adsorption tower A, The outlet adsorption tower B, adsorption tower C stove pipe is connected by valve with 6 inlet tube of storage heater, accumulator outlet pipe with it is circularly-supercharged 4 inlet tube of machine is connected, and circularly-supercharged machine outlet is connected with heater inlet pipe.
Embodiment 2:
According to a kind of process system for removing carbon dioxide in natural described in embodiment 1, the accumulator outlet Pipe is connect by valve with 9 inlet tube of fuel gas surge tank, and the fuel gas surge tank outlet is connect with fuel gas pipe, is risen A small amount of mixed gas of adsorption tower removes during temperature carbon dioxide and natural gas is as fuel.
Embodiment 3:
According to a kind of process system for removing carbon dioxide in natural as described in example 2, the accumulator outlet Pipe is connect with regeneration 8 inlet tube of Gas Cooler, and the regeneration gas cooler outlet pipe is natural by valve and the raw material Tracheae connection, the circularly-supercharged machine import setting purified gas supplement pipeline.
Embodiment 4:
A kind of process system of removing carbon dioxide in natural according to embodiment 2 or 3, the adsorption tower A, The adsorption tower B, the adsorption tower C filler are that molecular sieve, molecular sieve and active carbon multiple-hearth, molecular sieve and silica gel are compound Bed or molecular sieve and other combination of adsorbents, are not limited to other fillers.
Embodiment 5:
The method of the process system of the removing carbon dioxide in natural according to one of embodiment 1-4, party's genealogy of law System includes the following steps:
The source of raw natural gas is suitable for various natural gases first, is particularly suitable for carbon dioxide in natural gas The less situation of content, using titanium dioxide in two towers or three tower temp.-changing adsorptions and circularly-supercharged machine serial flow removing natural gas Carbon;
When using three tower temp.-changing adsorptions and when circularly-supercharged machine serial flow, accumulator outlet pipe and regeneration Gas Cooler into Mouthful pipe is connected, and regeneration gas cooler outlet pipe is connected by valve with raw natural gas pipe, when adsorption tower A be in adsorbed state, When adsorption tower B is in cold blowing state, adsorption tower C is in heated condition, and circularly-supercharged machine starts adsorption tower C and storage heater, adds Natural gas adsorption closed cycle heating in hot device, prevents adsorption tower C pressure superelevation, portion of natural gas after heating temperature raising It is discharged into fuel gas surge tank after storage heater, stops circularly-supercharged machine when closing to an end heating cycle and runs and close Air intake valve in heated condition adsorption tower C;In heated condition adsorption tower C pressure release to the pressure of a little higher than fuel surge tank Power, the interior gas rich in impurity of adsorption tower C open adsorption tower C air intake valve after being largely discharged and boost, this process reduces suction Impurity content in attached tower in gas;
After adsorption tower C boosts, and before system switching in a bit of time, (a bit of time is According in raw natural gas carbon dioxide content and unit scale determine;) rerun circularly-supercharged machine, adsorption tower C after Continuous to be in heated condition, circularly-supercharged machine import setting cold blowing gas supplements pipeline, for the purified gas when heating closes to an end Gas in displacement sorption tower, these gases for containing residual carbon dioxide return to raw natural gas after regeneration Gas Cooler is cooling Inlet pipeline enters adsorption tower A circulation absorption;Under avoiding the carbon dioxide that residual is excessive in next cold blowing stage cylinder from taking to A process;Adsorption tower C initially enters the cold blowing stage at the end of heating while adsorption tower B is in adsorbed state, and adsorption tower A is in Heated condition;When cold blowing using Partial cleansing gas by adsorbent in adsorption tower is cooling and cold blowing gas is cooled to by cold blowing Gas Cooler Enter next procedure after room temperature;When calculating determining cold blowing gas flow more than purification gas flow, can be increased using circulation Press cooling mode;
When needing biggish demand for fuel, continuous supplementation purification gas during circulating-heating can be at the end of heating Carbon dioxide in medium in adsorption tower C is diluted to and is met the requirements, then adsorption tower is not necessarily to pressure release and boost process;Described is de- Except the process system of carbon dioxide in natural, the carbon dioxide in raw natural gas can be not only removed, original can also be removed Expect the heavy hydrocarbon and moisture in natural gas;
This system can not only remove the carbon dioxide in raw natural gas, can also remove raw material it is natural in other are miscellaneous Matter such as heavy hydrocarbon and moisture, but two sets of systems should be separated into, using same removal methods, heavy hydrocarbon and moisture are first removed, after Carbon dioxide removal, though this is because circular regeneration gas temperature is higher, moisture therein still can by the micro absorption of molecular sieve from And remaining moisture will affect the next period to the adsorption effect of carbon dioxide;
The more traditional wet process decarbonization system of the application, process is simple, equipment is few, project cost is low, easy to operate, traditional Natural gas liquefaction device pretreatment system, decarbonization system mostly use greatly active MDEA technique, and MDEA method uses 45%~50% MDEA aqueous solution, and add suitable activator to improve the absorption rate of carbon dioxide, MDEA is not degradable, have compared with Strong anti-chemically and thermally degradation capability, it is current that corrosivity is small, and steam forces down, and solution cycling rate is low, and hydrocarbon solvability is small Most widely used gas purification handles solvent, especially when in raw natural gas carbon dioxide content it is higher (typically larger than 1%) When, which has wide range of applications, and domestic almost all of natural gas liquefaction engineering is all made of MDEA technique at present, though the technique So there is degree of purification height, outstanding advantages of methane losses are small, but complex process, take up a large area, invest it is larger, for day The lower situation of carbon dioxide content in right gas, the method carbon dioxide removal that can also be adsorbed using molecular sieve, but it is traditional Molecular sieve absorbing process for the regeneration gas containing carbon dioxide can only be used as generator or gas turbine fuel because carbon containing Regeneration gas only can not can only adapt to carbon dioxide separation, absorption method to use distributed energy unlike dehydration regeneration gas by cooling Occasion, thus limit the use scope of absorption method, it is no matter former for not using the natural gas liquefaction plant of distributed energy Expect carbon dioxide in natural content height, can only use traditional MDEA decarburization+molecular sieve dehydration technique.
In order to solve the problems, such as that regeneration gas is irretrievable in absorption method technique, regeneration gas is by circularly-supercharged machine by regeneration gas Circulating-heating, so that absorption tower packing heating, contains carbon dioxide with what temperature raising was precipitated in adsorption tower during heating Natural gas enter fuel surge tank, heating close to an end when will be in heated condition adsorption tower pressure release, will be in adsorption tower Impure gas leaks into fuel surge tank, and absorption tower pressure interior force is only slightly higher than fuel surge tank, boosts again later, this measure subtracts significantly The flow of system regeneration gas out is lacked, it is miscellaneous that the adsorption tower in heated condition after boosting still remains a small amount of carbon dioxide etc. Matter supplements a small amount of purified gas restarting circulating-heating process and imports heat gas again to reach further purification purpose Raw material tracheae is incorporated to after angry cooler is cooling and enters adsorption process, to ensure that these fraction of impure gases will not be in cold blowing Bring subsequent processing into the process;
The application goes out that system regeneration throughput is small, and a small amount of regeneration gas can be used as molecular sieve heating and warming is used, It is particularly suitable for not using the lower natural gas liquefaction device of the carbon dioxide content of distributed energy;
With 100 × 104Nm3For/d natural gas liquefaction engineering (it is assumed that carbon dioxide content 0.6% in unstripped gas), this is practical It is novel as follows compared with traditional handicraft:

Claims (2)

1. a kind of process system for removing carbon dioxide in natural, composition includes: raw natural gas entrance, it is characterized in that: The raw natural gas entrance is connect with the inlet tube of adsorption tower A, adsorption tower B, adsorption tower C respectively by valve, adsorption tower A, the outlet of adsorption tower B, adsorption tower C connects by valve with purified natural gas pipe, purified natural gas pipe by valve with respectively Cold blowing inlet tube is connected, and each cold blowing outlet is connected with cold blowing Gas Cooler inlet tube, cold blowing Gas Cooler outlet and purification Natural gas tube is connected, and heater outlet pipe is connected with adsorption tower A, adsorption tower B, adsorption tower C inlet tube respectively by valve, adsorbs Tower A, adsorption tower B, adsorption tower C outlet stove pipe are connected by valve with storage heater inlet tube, accumulator outlet pipe and circulation Supercharger inlet tube is connected, and circularly-supercharged machine outlet is connected with heater inlet pipe;
The accumulator outlet pipe is connect by valve with fuel gas surge tank inlet tube, the fuel gas surge tank outlet Pipe is connect with fuel gas pipe, and a small amount of mixed gas of adsorption tower removes in temperature-rise period carbon dioxide and natural gas is as combustion Material;
The accumulator outlet pipe is connect with regeneration gas cooler inlet pipe, and the regeneration gas cooler outlet pipe passes through valve Door is connect with the raw natural gas pipe, and the circularly-supercharged machine import setting purified gas supplements pipeline.
2. a kind of process system for removing carbon dioxide in natural according to claim 1, it is characterized in that: the suction Attached tower A, the adsorption tower B, the adsorption tower C filler are molecular sieve, molecular sieve and active carbon multiple-hearth, molecular sieve and silicon Glue multiple-hearth or molecular sieve are combined with activated alumina.
CN201820991189.9U 2018-06-26 2018-06-26 Remove the process system of carbon dioxide in natural Expired - Fee Related CN208829616U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108641765A (en) * 2018-06-26 2018-10-12 兰文旭 Remove the process system and method for carbon dioxide in natural
CN110408446A (en) * 2019-08-01 2019-11-05 兰文旭 The liquefied natural gas pre-processing device and method that UF membrane is combined with temp.-changing adsorption

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108641765A (en) * 2018-06-26 2018-10-12 兰文旭 Remove the process system and method for carbon dioxide in natural
CN110408446A (en) * 2019-08-01 2019-11-05 兰文旭 The liquefied natural gas pre-processing device and method that UF membrane is combined with temp.-changing adsorption

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Granted publication date: 20190507

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