CN104312650B - System for improving liquefied natural gas recovery rate - Google Patents
System for improving liquefied natural gas recovery rate Download PDFInfo
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- CN104312650B CN104312650B CN201410583577.XA CN201410583577A CN104312650B CN 104312650 B CN104312650 B CN 104312650B CN 201410583577 A CN201410583577 A CN 201410583577A CN 104312650 B CN104312650 B CN 104312650B
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Abstract
The invention discloses a system for improving liquefied natural gas recovery rate and relates to the field of liquefied natural gas production. The system comprises a raw material gas conveying pipe, a compressor, a methanation reactor, a liquefied natural gas purification tower and pipelines, and the system is characterized by being further provided with a pressure swing adsorption device which is provided with a pressure swing adsorption tower, wherein the raw material gas conveying pipe is connected with the compressor, the compressor is connected with the methanation reactor, the methanation reactor is connected with the liquefied natural gas purification tower which is connected with the pressure swing adsorption tower, the pressure swing adsorption tower is connected with the raw material gas conveying pipe or the liquefied natural gas purification tower, and the devices are communicated by virtue of corresponding pipelines. The system disclosed by the invention is simple to operate and cost-saving, the energy consumption is reduced, and the recovery rate of the liquefied natural gas can reach over 99.8%.
Description
Technical field
The present invention relates to liquefied natural gas (LNG) production field, in more particularly to a kind of raising liquefied natural gas, the rate of recovery is
System.
Background technology
From methane rich gaseous mixture preparing liquefied natural gas (abbreviation lng) particularly coke-stove gas etc. contain more hydrogen and
In the source of the gas preparing liquefied natural gas technique of the on-condensible gases such as nitrogen, in order to reduce in liquefied natural gas purification column overhead on-condensible gas
The methane carried secretly, improves the rate of recovery of liquefied natural gas, and the method generally adopting is to reduce liquefied natural gas purification column overhead temperature
Degree, or even adopt the cooler increasing with liquid nitrogen as cryogen, even so, liquefied natural gas tower top still can be carried secretly in dropping a hint
A small amount of methane, is the key factor of impact liquefied natural gas plant methane recovery.And with liquefied natural gas tower top heat exchange
The reduction of device efficiency, tower top middle methane of dropping a hint can increase, and reduce the rate of recovery of liquefied natural gas plant methane, cause unit
Liquefied natural gas (LNG) production energy consumption increases.
In Chinese patent application publication No. cn102079999a a kind of with coke-stove gas for raw material produce liquefied natural gas and
The method of synthesis gas, discloses and for the methane rich being dried to send into ice chest liquefaction, obtain liquefied natural gas, and fixed gas is sent into transformation and inhaled
Attached enrichment methane unit entrance mixes, with purification coal gas, the h2 that will purify in coal gas by pressure-variable adsorption, and n2, co are carried out with methane
Separate the method obtaining synthesis gas and methane-rich gas, on-condensible gas and methane content due to liquefied natural gas ice chest are several times as much as
The coal gas mixing of on-condensible gas is enriched with the raw material of methane unit so that the synthesis that obtains through pressure-swing absorption apparatus as pressure-variable adsorption
Still a part of methane can be carried secretly in gas, fail to play raising liquefied natural gas methane recovery, reduce liquefied natural gas energy consumption
Effect.
The method that coke-stove gas produces liquefied natural gas is utilized in Chinese patent application publication No. cn102942972a, open
On-condensible gas removes wherein n2 with psa molecular sieve, vacuum desorption by the methane of psa molecular sieve adsorption, methane content in desorption
The method that more than 90% return coke-stove gas recycles, because in stripping gas, methane content is up to 90%, can release from absorption waste gas
Put portion of methane, thus reducing methane recovery.Equally fail to solve the problems, such as to improve the liquefied natural gas rate of recovery.
Content of the invention
In order to solve above technical problem, the present invention provides a kind of system improving the liquefied natural gas rate of recovery, from liquefaction
Methane is reclaimed in the on-condensible gas that natural gas refining tower applies, simple to operate, cost-effective, reduce energy resource consumption, liquefaction is natural
The rate of recovery of gas is up to more than 99.8%.
Solve the system that one of present invention of above technical problem improves the liquefied natural gas rate of recovery, including unstripped gas
Delivery pipe, compressor, methanator, dehydration and impurity clarifier, liquefied natural gas purifying column and pipeline, its feature exists
In: it is additionally provided with pressure-swing absorption apparatus, pressure-swing absorption apparatus is provided with pressure-swing absorber, raw material letter shoot is connected with compressor, pressure
Contracting machine is connected with methanator, and methanator is connected with liquefied natural gas purifying column, liquefied natural gas purifying column with
Pressure-swing absorber be connected, pressure-swing absorber is connected with raw material letter shoot or liquefied natural gas purifying column, each device above it
Between be connected connected by corresponding pipeline；In removal process, unstripped gas sequentially passes through raw material letter shoot, compressor and methane
Change reactor, subsequently into the reaction of liquefied natural gas purifying column, the fixed gas that liquefied natural gas purifying column discharges is again through transformation
Methane-rich gas are obtained, methane-rich gas return to raw material letter shoot or the recovery of liquefied natural gas purifying column is therein after adsorption tower
Methane.
Thus control methane content in pressure-swing absorption apparatus absorption waste gas by the adjustment of adsorption time, reach raising liquid
Change the purpose of natural gas refining tower methane recovery.
Described pressure-swing absorption apparatus is additionally provided with sequencing valve, plc control system and vavuum pump, is connected with pressure-swing absorber.
It is provided with adsorbent, adsorbent is one in activated carbon, activated alumina, silica gel and molecular sieve in described pressure-swing absorber
Plant or multiple.
Described pressure-swing absorber >=2.
It is additionally provided with compressor between described pressure-swing absorber and liquefied natural gas purifying column.
Described system is additionally provided with raw material gas holder between raw material letter shoot and compressor.
Described system is provided with desulfurizing and purifying tower between compressor and methanator.
Described system is provided with dehydration and impurity clarifier between methanator and liquefied natural gas purifying column.
The present invention controls pressure-variable adsorption to inhale using pressure-swing absorption apparatus from liquefied natural gas purification column overhead on-condensible gas
Attached waste gas methane content, the system reclaiming methane in on-condensible gas, to improve liquefied natural gas methane recovery, reduces liquefaction sky
So gas specific energy consumption.The adsorption step pressure of above-mentioned pressure-variable adsorption tower apparatus is more than 0.15mpa, generally purifies in liquefied natural gas
Tower on-condensible gas discharges and operates under pressure.Inverse put step pressure is more than 0.1mpa, and evacuation step pressure is 0.001～0.06mpa.
(pressure is all represented with absolute pressure)
System in the present invention includes step in detail below in pressure-swing absorber transformation process:
(1) adsorption step: the liquefied natural gas purifying column on-condensible gas containing methane enters adsorbent bed from adsorption tower import, no
Methane in solidifying gas gas is adsorbed the adsorbent absorption of filling in tower, and the on-condensible gas being difficult to adsorb is arranged from adsorption column outlet
Go out to be referred to as to adsorb waste gas.This step realizes the separation of methane and other on-condensible gas components.Generally in absorption waste gas, methane contains
Amount controls 0.05%～0.5%.
(2) forward bleed off pressure step: along stride the adsorption tower being suddenly adsorption step is completed or when equal voltage drop step complete
Adsorption tower, by pipeline and sequencing valve, the gas in adsorption tower is discharged from the port of export of adsorption tower, reduces adsorption column pressure.
(3) equal voltage drop step: all voltage drop step is the adsorption tower completing adsorption step or along the suction suddenly completing of strideing
Attached tower, is connected with the adsorption tower entering all pressure liter steps with sequencing valve by pipeline, reduces the pressure of equal voltage drop step adsorption tower
Reclaim the methane component in equal voltage drop step.All voltage drop step can be set to 1 time according to adsorptive pressure, or repeatedly as one all drops
E2d all drops in e1d and two.
(4) inverse put step: adsorption step is completed or adsorption step after the completion of carried out equal voltage drop step or along putting again
The adsorption tower of step, opens the sequencing valve connecting adsorption tower unstripped gas arrival end, discharges the gas in adsorption tower, reduces adsorption tower
Pressure, make methane moiety in adsorption tower for the absorption desorb adsorbent, obtain methane rich product, inhale after the completion of inverse put step
Attached pressure tower is 0.1mpa～0.15 mpa.
(5) vacuum step: using vavuum pump, the adsorption tower after inverse put is evacuated, reduce the pressure of adsorption tower further
Power, makes methane in adsorbent for the absorption desorb adsorbent further, obtains methane rich product, adsorb after the completion of inverse put step
Pressure tower is 0.001～0.06mpa.
(6) all press and rise step:
By the adsorption tower after the completion of evacuation step, connected with the adsorption tower being in equal voltage drop step by pipeline and sequencing valve
Connect, so that the gas in the higher equal voltage drop step adsorption tower of pressure is entered all and press the adsorption tower rising, rise adsorption tower to raise all pressures
Pressure, and the methane in recovery section equal pressure drop gas.All pressure rises step and be can be set to 1 time according to adsorptive pressure, or repeatedly
As two all liter e2r and all rise e1r.
(7) boosting step: using absorption waste gas to all pressing the adsorption tower after the completion of liter step to boost, make up to suction
Enclosure pressure, is prepared to enter into adsorption step.
The system of the raising liquefied natural gas rate of recovery of the present invention is applicable to from coal preparing liquefied natural gas, coke-stove gas system
Liquefied natural gas, blue carbon tail gas preparing liquefied natural gas etc. other contain the liquefied natural gas of on-condensible gas.
System methane recovery in the present invention can bring up to more than 99.8% by 94% ~ 96%, and tower top does not coagulate in hydrogen rich gas
Methane content is reduced to less than 0.2% by 3% ~ 5%.
Brief description
Fig. 1 is the system schematic of embodiment 3 in the present invention
Fig. 2 is the system schematic of embodiment 5 in the present invention
Specific embodiment
Below by way of the embodiment of specific embodiment, the present invention is further detailed explanation.But this should not be understood
Scope for the above-mentioned theme of the present invention is only limitted to below example.Without departing from the idea case in the present invention described above, root
The various replacements made according to ordinary skill knowledge and customary means or change, are included within the scope of the present invention.
Embodiment 1
A kind of improve the liquefied natural gas rate of recovery system, including raw material letter shoot, compressor, methanator,
Liquefied natural gas purifying column, pipeline and pressure-swing absorption apparatus, pressure-swing absorption apparatus is provided with pressure-swing absorber, raw material letter shoot with
Compressor is connected, and compressor is connected with methanator, and methanator is connected with liquefied natural gas purifying column, and liquefy sky
So gas purifying column is connected with pressure-swing absorber, and pressure-swing absorber is connected with liquefied natural gas purifying column, between each device above
Be connected connected by corresponding pipeline；During liquefied natural gas (LNG) production, unstripped gas sequentially passes through raw material letter shoot, compression
Machine and methanator, subsequently into the reaction of liquefied natural gas purifying column, the fixed gas that liquefied natural gas purifying column discharges is again
Obtain methane-rich gas after pressure-swing absorber, methane-rich gas return to liquefied natural gas purifying column and reclaim methane therein,
Reach the purpose improving liquefied natural gas methane recovery.
Pressure-swing absorption apparatus is additionally provided with sequencing valve, plc control system and vavuum pump, is provided with adsorbent in pressure-swing absorber,
Adsorbent is one or more in activated carbon, activated alumina, silica gel and molecular sieve.Pressure-swing absorber 2.Pressure-swing absorption apparatus
It is additionally provided with compressor between vavuum pump and liquefied natural gas purifying column.
Embodiment 2
A kind of improve the liquefied natural gas rate of recovery system, including raw material letter shoot, compressor, methanator,
Liquefied natural gas purifying column, pipeline and pressure-swing absorption apparatus, pressure-swing absorption apparatus is provided with pressure-swing absorber, raw material letter shoot with
Compressor is connected, and compressor is connected with methanator, and methanator is connected with liquefied natural gas purifying column, and liquefy sky
So gas purifying column is connected with pressure-swing absorber, and being connected between each device above is connected by corresponding pipeline；Liquefaction is natural
In gas production process, unstripped gas sequentially passes through raw material letter shoot, compressor and methanator, natural subsequently into liquefying
Gas purifying column, the fixed gas that liquefied natural gas purifying column discharges obtains methane-rich gas, methane rich again after pressure-swing absorption apparatus
Gas returns to raw material letter shoot and reclaims methane therein.Pressure-swing absorption apparatus is additionally provided with sequencing valve, plc control system and true
Empty pump.It is provided with adsorbent, adsorbent is a kind of or many in activated carbon, activated alumina, silica gel and molecular sieve in pressure-swing absorber
Kind.Pressure-swing absorber 3.Adsorb methane content in waste gas by reducing pressure-swing absorption apparatus, reach raising liquefied natural gas and carry
The purpose of pure tower methane recovery.
Embodiment 3
A kind of improve the liquefied natural gas rate of recovery system, including raw material letter shoot, raw material gas holder, desulfurizing and purifying tower,
Compressor, methanator, dehydration and impurity clarifier, liquefied natural gas purifying column, pipeline and pressure-swing absorption apparatus, transformation
Adsorbent equipment is provided with pressure-swing absorber, and raw material letter shoot is connected with raw material gas holder, and raw material gas holder is connected with compressor, compressor
It is connected with desulfurizing and purifying tower, desulfurizing and purifying tower is connected with methanator, methanator and dehydration and impurity clarifier
It is connected, dehydration and impurity clarifier are connected with liquefied natural gas purifying column, and liquefied natural gas purifying column is connected with adsorption tower, absorption
Tower is connected with raw material gas holder, and being connected between each device above is connected by corresponding pipeline；In production process unstripped gas according to
Secondary through raw material gas holder, compressor, desulfurizing and purifying tower, methanator, dehydration and impurity clarifier, subsequently into liquefaction sky
So gas purifying column reaction, the fixed gas that liquefied natural gas purifying column discharges obtains methane-rich gas after adsorbent equipment again, is the richest in
Alkane gas returns to raw material gas holder and reclaims methane therein.Control pressure-swing absorption apparatus absorption useless by the adjustment of adsorption time
Methane content in gas, reaches the purpose improving liquefied natural gas purifying column methane recovery.It is additionally provided with journey in pressure-swing absorption apparatus
Control valve, plc control system and vavuum pump, are provided with adsorbent in absorber, adsorbent is activated carbon, activated alumina, silica gel and
One or more in molecular sieve.Adsorption tower 9.
Embodiment 4
A kind of improve the liquefied natural gas rate of recovery system, including raw material letter shoot, raw material gas holder, desulfurizing and purifying tower,
Compressor, methanator, dehydration and impurity clarifier, liquefied natural gas purifying column, pipeline and pressure-swing absorption apparatus, transformation
Adsorbent equipment is provided with pressure-swing absorber, and be connected with raw material gas holder team, raw material gas holder of raw material letter shoot is connected with compressor, compression
Machine is connected with desulfurizing and purifying tower, and desulfurizing and purifying tower is connected with methanator, and methanator is purified with dehydration and impurity
Device is connected, and dehydration and impurity clarifier are connected with liquefied natural gas purifying column, and liquefied natural gas purifying column is connected with adsorption tower, inhales
Attached tower is connected with raw material gas holder, and being connected before each device above is connected by corresponding pipeline；Unstripped gas in production process
Sequentially pass through raw material gas holder, compressor, desulfurizing and purifying tower, methanator, dehydration and impurity clarifier, subsequently into liquefaction
Natural gas refining tower reacts, and the fixed gas that liquefied natural gas purifying column discharges obtains methane-rich gas after sequentially passing through adsorption tower again,
Methane-rich gas return to raw material gas holder and reclaim methane therein.Contained by controlling pressure-swing absorption apparatus to adsorb methane in waste gas
Amount, reaches the purpose improving liquefied natural gas purifying column methane recovery.It is additionally provided with sequencing valve, plc control in pressure-swing absorption apparatus
System processed and vavuum pump, are provided with adsorbent in adsorption tower, adsorbent is one in activated carbon, activated alumina, silica gel and molecular sieve
Plant or multiple.Adsorption tower 5.
The present embodiment is the device with coke-stove gas for raw material preparing liquefied natural gas after methanation, liquefied natural gas (LNG)-throughput
For 100,000 tons/year.In an embodiment, coke-stove gas is added into methanation after raw material gas holder, compressor compresses and desulfurizing and purifying
Conversion reactor, in methanator, carbon monoxide, carbon dioxide and hydrogen react generation methane, after methanation reaction
Gas purify removing water through dehydration and impurity device, enter LNG cold purification after the impurity such as traces of carbon dioxide and mercury
Tower, low temperature purifying column adopts the two refrigerants circularly cooling of mrc refrigerant cycle refrigeration and liquid nitrogen cryogen, to reduce purification tower top temperature
Improve methane recovery, methane recovery is 98.5% in this case, and tower top hydrogen-rich atmospheric pressure 1.3mpa, in nitrogen-rich gas
Methane content ~ 1.5%, pressure 0.6mpa, in order to improve methane recovery further, LNG cold purification tower top is speeded
The gas hydrogen-rich gas put is mixed with nitrogen-rich gas, after mixing methane content be 1.74%, introduce by 5 adsorption towers, sequencing valve,
The pressure-variable adsorption of plc control system and vavuum pump composition reclaims methane device.Methane in on-condensible gas is adsorbed loading in tower
Adsorbent absorption, from adsorption column outlet obtain methane content be less than 0.12% hydrogen-rich and nitrogen-rich gas discharger be used for firing
Material or other purposes.Obtain from inverse put and evacuating gas ~ 9% methane rich stripping gas returns coke-oven coal gas holder and coke-oven coal
The raw materials recovery methane therein that gas mixes as gas employing methanation of coke oven preparing liquefied natural gas device increases the first of whole device
The alkane rate of recovery, methane recovery 99.9%.1400 tons of liquefied natural gas can be increased production every year.
Pressure 0.6mpa flow 14868nm after LNG cold purification tower top on-condensible gas mixing3/ h composition is shown in Table 1
Table 1 purification tower top on-condensible gas composition
Pressure-variable adsorption reclaims methane unit and is formed by connecting by 5 absorbers, program-controlled valve and corresponding pipeline.Each follow
Ring process experience absorption a, all fall ed1, two all fall ed2, inverse put d, evacuate v, two all rise er2, one all rise er1, final boost
Eight steps of fr, its each tower runs sequential and is shown in Table 2.
Table 2 adsorption tower device work schedule table
Now taking adsorption tower a as a example, each processing step of narration:
Absorption a
The unstripped gas making recovery unit from the on-condensible gas of liquefied natural gas tower top enters adsorption tower a, wherein methane group
Part is preferentially adsorbed stays in adsorbent bed, the absorption waste gas output device of the impurity such as the h2 of component containing weakly stable, n2.
One equal pressure drop e1d
Gas in adsorption tower a carries out with adsorption tower c that pressure is equilibrium, and when two pressure towers are of substantially equal, this step terminates.
Two equal pressure drop e2d
Gas in adsorption tower a carries out with adsorption tower d that pressure is equilibrium, and when two pressure towers are of substantially equal, this step terminates.
Inverse put d
In adsorption tower a, gas is inversely bled off pressure against the direction of absorption, inverse is deflated to inverse put gas surge tank.
Evacuate v
Vavuum pump directly vacuumizes to adsorption tower a, the cooled device of half product gas of vacuum pumped be cooled to 40 DEG C laggard
Enter half product gas surge tank to mix with inverse put gas phase.Pressure process drops to -0.085mpa by 0.02mpa.
Two all pressures rise e2r
In adsorption tower c, gas flows into adsorption tower a, carries out pressure equilibrium, when two pressure towers are of substantially equal, this step terminates.
One all pressures rise e1r
In adsorption tower d, gas flows into adsorption tower a, carries out pressure equilibrium, when two pressure towers are of substantially equal, this step terminates.
Final boosting fr
Absorption waste gas enters adsorption tower a and is finally boosted.When adsorption tower a pressure is substantially near adsorptive pressure, this step
Suddenly terminate.
So far, all eight steps in a cycle for the adsorption tower a are performed both by finishing, and initially enter and follow next time
Ring, the step performed by other 4 adsorption towers is identical with adsorption tower a, simply mutually staggers in time, to ensure separation process
It is carried out continuously.
Each adsorption column pressure is in cyclically-varying with the change of processing step, according to practical operation situation, adsorptive pressure
Can suitably adjust, then other step pressure accordingly change.
High methane gas scale of construction 1561nm after concentration3/ h, composition is as shown in table 3
After table 3 concentrates, methane-rich gas form
Hydrogen-rich tolerance 11485 nm of output enrichment facility3/ h, composition is as shown in table 4
After table 4 concentrates, methane-rich gas form
Embodiment 5
A kind of improve the liquefied natural gas rate of recovery system, including raw material letter shoot, raw material gas holder, desulfurizing and purifying tower,
Compressor, methanator, dehydration and impurity clarifier, liquefied natural gas purifying column, pipeline and pressure-swing absorber, unstripped gas
Delivery pipe is connected with raw material gas holder, and raw material gas holder is connected with compressor, and compressor is connected with desulfurizing and purifying tower, desulfurizing and purifying tower with
Methanator is connected, and methanator is connected with dehydration and impurity clarifier, is dehydrated and impurity clarifier and liquefaction sky
So gas purifying column is connected, and liquefied natural gas purifying column is connected with adsorption tower, and adsorption tower is connected with liquefied natural gas purifying column, above
Being connected between each device is connected by corresponding pipeline；In production process unstripped gas sequentially pass through raw material gas holder, compressor,
Desulfurizing and purifying tower, methanator, dehydration and impurity clarifier, subsequently into the reaction of liquefied natural gas purifying column, liquefy sky
The fixed gas that so gas purifying column discharges obtains methane-rich gas after sequentially passing through adsorption tower again, and it is natural that methane-rich gas return to liquefaction
Gas purifying column reclaims methane therein.Control methane in pressure-swing absorption apparatus absorption waste gas to contain by the adjustment of adsorption time
Amount, reaches the purpose improving liquefied natural gas purifying column methane recovery.Be provided with pressure-swing absorption apparatus adsorption tower, sequencing valve,
Plc control system and vavuum pump, are provided with adsorbent in adsorption tower, adsorbent is activated carbon, activated alumina, silica gel and molecular sieve
In one or more；Adsorption tower 6, is additionally provided with compressor between pressure-swing absorption apparatus and liquefied natural gas purifying column.
The present embodiment is the device with coke-stove gas for raw material preparing liquefied natural gas after methanation, liquefied natural gas (LNG)-throughput
For 80,000 tons/year.In an embodiment, coke-stove gas is added into methanation conversion reactor after desulfurizing and purifying, in methanation reaction
In device, carbon monoxide, carbon dioxide and hydrogen react generation methane, the purified removing water, micro of the gas after methanation reaction
LNG cold purifying column is entered, low temperature purifying column adopts mrc refrigerant cycle to freeze, first after the impurity such as carbon dioxide and mercury
The alkane rate of recovery is 96%, tower top hydrogen-rich atmospheric pressure 1.3mpa, wherein methane content 4.5%, in order to improve methane recovery further,
The speed hydrogen-rich gas put of LNG cold purification tower top is introduced by 6 adsorption towers, sequencing valve, plc control system and true
The pressure-variable adsorption that empty pump group becomes reclaims methane unit.Methane in on-condensible gas is adsorbed loading in tower
Adsorbent absorption, from adsorption column outlet obtain methane content be less than 0.52% hydrogen-rich gas discharger be used for fuel or its
His purposes.Obtain from inverse put and evacuating gas ~ 32% methane rich stripping gas compressed to 1.5mpa after return liquefied natural gas
Purifying column reclaims methane therein increases methane recovery, methane recovery 99.6%.Annual increase liquefied natural gas (LNG)-throughput 2917
Ton.
LNG cold purifies tower top on-condensible gas pressure 1.3mpa flow 12550nm3/ h composition is shown in Table 5
Table 5 purification tower top on-condensible gas composition
Pressure-variable adsorption reclaims methane unit and is formed by connecting by 6 adsorption towers, program-controlled valve and corresponding pipeline.Each follow
Ring process experience absorption a, along put pp, all fall ed1, two all fall ed2, inverse put d, evacuate v, two all rise er2, one all rise er1,
Eight steps of fr are pressed in final rise, and its each tower runs sequential and is shown in Table 6.
Table 6 adsorption tower device work schedule table
Now taking adsorption tower a as a example, each processing step of narration:
Absorption a
The unstripped gas making recovery unit from the on-condensible gas of liquefied natural gas tower top enters adsorption tower a, wherein methane group
Part is preferentially adsorbed stays in adsorbent bed, the absorption waste gas output device of the impurity such as the h2 of component containing weakly stable, n2.
Along putting pp
Open the sequencing valve connecting along putting pipeline, the gas in the adsorption tower a after the completion of adsorption step is gone out from adsorption tower
Mouthful end discharges adsorption tower, reduces the pressure of adsorption tower to 0.6mpa.
One equal pressure drop e1d
Gas in adsorption tower a carries out with adsorption tower d that pressure is equilibrium, and when two pressure towers are of substantially equal, this step terminates.
Two equal pressure drop e2d
Gas in adsorption tower a carries out with adsorption tower e that pressure is equilibrium, and when two pressure towers are of substantially equal, this step terminates.
Inverse put d
In adsorption tower a, gas is inversely bled off pressure against the direction of absorption, inverse is deflated to inverse put gas surge tank.
Evacuate v
Vavuum pump directly vacuumizes to adsorption tower a, the cooled device of half product gas of vacuum pumped be cooled to 40 DEG C laggard
Enter half product gas surge tank to mix with inverse put gas phase.Pressure process drops to -0.085mpa by 0.02mpa.
Two all pressures rise e2r
In adsorption tower c, gas flows into adsorption tower a, carries out pressure equilibrium, when two pressure towers are of substantially equal, this step terminates.
One all pressures rise e1r
In adsorption tower d, gas flows into adsorption tower a, carries out pressure equilibrium, when two pressure towers are of substantially equal, this step terminates.
Final boosting fr
Absorption waste gas enters adsorption tower a and is finally boosted.When adsorption tower a pressure is substantially near adsorptive pressure, this step
Suddenly terminate.
So far, all eight steps in a cycle for the adsorption tower a are performed both by finishing, and initially enter and follow next time
Ring, the step performed by other 4 adsorption towers is identical with adsorption tower a, simply mutually staggers in time, to ensure separation process
It is carried out continuously.
Each adsorption column pressure is in cyclically-varying with the change of processing step, according to practical operation situation, adsorptive pressure
With can suitably adjust along bleeding off pressure power, then other step pressure accordingly change.
High methane gas scale of construction 1590nm after concentration3/ h, composition is as shown in table 7
After table 7 concentrates, methane-rich gas form
Hydrogen-rich tolerance 10960 nm of output enrichment facility3/ h, composition is as shown in table 8
After table 8 concentrates, methane-rich gas form
Claims (8)
1. a kind of system improving the liquefied natural gas rate of recovery, including raw material letter shoot, compressor, methanator, takes off
Water and impurity clarifier, liquefied natural gas purifying column and pipeline it is characterised in that: be additionally provided with pressure-swing absorption apparatus, pressure-variable adsorption
Device is provided with pressure-swing absorber；Raw material letter shoot is connected with compressor, and compressor is connected with methanator, and methanation is anti-
Device is answered to be connected with liquefied natural gas purifying column, liquefied natural gas purifying column is connected with pressure-swing absorber, pressure-swing absorber and raw material
Letter shoot or liquefied natural gas purifying column are connected, and being connected between each device above is connected by corresponding pipeline；Reclaim
During unstripped gas sequentially pass through raw material letter shoot, compressor and methanator, subsequently into liquefied natural gas purification
Tower reacts, and the fixed gas that liquefied natural gas purifying column discharges obtains methane-rich gas, methane-rich gas again after pressure-swing absorber
Return to raw material letter shoot or liquefied natural gas purifying column reclaims methane therein, described pressure-swing absorber >=2;Described change
In pressure adsorption tower fixed gas through adsorb, forward bleed off pressure, equal pressure drop, inverse put, vacuumize, all pressure liter and boosting step obtain methane rich
Gas.
2. a kind of system improving the liquefied natural gas rate of recovery according to claim 1 it is characterised in that: described transformation is inhaled
Adsorption device is additionally provided with sequencing valve, plc control system and vavuum pump, is connected with pressure-swing absorber.
3. according to claim 1 a kind of improve the liquefied natural gas rate of recovery system it is characterised in that: described adsorption tower
In be provided with adsorbent, adsorbent is activated carbon, activated alumina, one or more in silica gel and molecular sieve.
4. a kind of raising liquefied natural gas rate of recovery according to any one of claim 1-3 system it is characterised in that:
Described adsorption column pressure ＞ 0.15mpa, evacuation pressure is 0.001～0.06mpa.
5. a kind of raising liquefied natural gas rate of recovery according to claim 1 system it is characterised in that: described transformation
It is provided with compressor between adsorption tower and liquefied natural gas purifying column.
6. a kind of raising liquefied natural gas rate of recovery according to claim 1 system it is characterised in that: described system
It is additionally provided with raw material gas holder between raw material letter shoot and compressor.
7. a kind of raising liquefied natural gas rate of recovery according to claim 1 system it is characterised in that: described system
It is provided with desulfurizing and purifying tower between compressor and methanator.
8. a kind of raising liquefied natural gas rate of recovery according to claim 1 system it is characterised in that: described system
It is provided with dehydration and impurity clarifier between methanator and liquefied natural gas purifying column.
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| CN104312650A CN104312650A (en) | 2015-01-28 |
| CN104312650B true CN104312650B (en) | 2017-01-25 |
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| CN102079999A (en) * | 2011-01-21 | 2011-06-01 | 成都赛普瑞兴科技有限公司 | Method for producing liquefied natural gas and synthetic gas by taking coke oven gas as raw material |
| CN102732347A (en) * | 2012-07-12 | 2012-10-17 | 新地能源工程技术有限公司 | Adjustable process for co-producing liquefied natural gas and hydrogen by coke furnace gas |
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| CN101597527B (en) * | 2009-07-07 | 2012-12-19 | 山西科灵环境工程设计技术有限公司 | Method for making synthetic natural gas by utilizing coke oven gas |
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| CN102732347A (en) * | 2012-07-12 | 2012-10-17 | 新地能源工程技术有限公司 | Adjustable process for co-producing liquefied natural gas and hydrogen by coke furnace gas |
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