CN106693609A - Method for recovering tail gas of ethylene-propylene device - Google Patents
Method for recovering tail gas of ethylene-propylene device Download PDFInfo
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- CN106693609A CN106693609A CN201710042888.9A CN201710042888A CN106693609A CN 106693609 A CN106693609 A CN 106693609A CN 201710042888 A CN201710042888 A CN 201710042888A CN 106693609 A CN106693609 A CN 106693609A
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- 238000000034 method Methods 0.000 title claims abstract description 50
- HQQADJVZYDDRJT-UHFFFAOYSA-N ethene;prop-1-ene Chemical group C=C.CC=C HQQADJVZYDDRJT-UHFFFAOYSA-N 0.000 title abstract 4
- 238000001179 sorption measurement Methods 0.000 claims abstract description 265
- 238000011282 treatment Methods 0.000 claims abstract description 99
- 238000011084 recovery Methods 0.000 claims abstract description 6
- 239000007789 gas Substances 0.000 claims description 218
- 238000006073 displacement reaction Methods 0.000 claims description 59
- 238000010521 absorption reaction Methods 0.000 claims description 42
- 239000012141 concentrate Substances 0.000 claims description 41
- 239000013067 intermediate product Substances 0.000 claims description 39
- 239000000047 product Substances 0.000 claims description 39
- 239000003463 adsorbent Substances 0.000 claims description 33
- 238000011069 regeneration method Methods 0.000 claims description 29
- 230000008929 regeneration Effects 0.000 claims description 23
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 claims description 15
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical group C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims description 14
- 230000000274 adsorptive effect Effects 0.000 claims description 14
- -1 ethylene, propylene Chemical group 0.000 claims description 9
- 230000008439 repair process Effects 0.000 claims description 7
- 239000005977 Ethylene Substances 0.000 claims description 6
- 239000004215 Carbon black (E152) Substances 0.000 claims description 5
- 229930195733 hydrocarbon Natural products 0.000 claims description 5
- 150000002430 hydrocarbons Chemical class 0.000 claims description 5
- 230000006837 decompression Effects 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 claims description 3
- 239000002994 raw material Substances 0.000 claims description 3
- 230000000087 stabilizing effect Effects 0.000 claims description 3
- 230000003247 decreasing effect Effects 0.000 claims description 2
- 239000005416 organic matter Substances 0.000 abstract description 12
- 230000008901 benefit Effects 0.000 abstract description 10
- 230000007613 environmental effect Effects 0.000 abstract description 5
- 239000006227 byproduct Substances 0.000 abstract description 3
- 238000012163 sequencing technique Methods 0.000 description 30
- 230000001105 regulatory effect Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 4
- 239000000203 mixture Substances 0.000 description 3
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 3
- OTMSDBZUPAUEDD-UHFFFAOYSA-N Ethane Chemical compound CC OTMSDBZUPAUEDD-UHFFFAOYSA-N 0.000 description 2
- 239000001273 butane Substances 0.000 description 2
- IJDNQMDRQITEOD-UHFFFAOYSA-N n-butane Chemical compound CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 description 2
- OFBQJSOFQDEBGM-UHFFFAOYSA-N n-pentane Natural products CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 2
- 239000001294 propane Substances 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 125000000383 tetramethylene group Chemical group [H]C([H])([*:1])C([H])([H])C([H])([H])C([H])([H])[*:2] 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 239000000809 air pollutant Substances 0.000 description 1
- 231100001243 air pollutant Toxicity 0.000 description 1
- 150000001336 alkenes Chemical class 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000010237 hybrid technique Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
- B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
- B01D53/047—Pressure swing adsorption
- B01D53/0476—Vacuum pressure swing adsorption
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
- B01D2257/708—Volatile organic compounds V.O.C.'s
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/40—Further details for adsorption processes and devices
- B01D2259/40011—Methods relating to the process cycle in pressure or temperature swing adsorption
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/40—Further details for adsorption processes and devices
- B01D2259/402—Further details for adsorption processes and devices using two beds
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Separation Of Gases By Adsorption (AREA)
Abstract
The invention relates to the technical field of tail gas recovery, in particular to a method for recovering tail gas of an ethylene-propylene device. Organic matter in tail gas of the ethylene-propylene device is recovered through a vacuum pressure swing adsorption method, so that the organic matter content of final discharged tail of the device conforms to the discharge standard. The method mainly comprises the following treating steps of discharged tail gas mixing, primary-section VPSA concentration increasing treatment and secondary-section VPSA concentration increasing treatment. Compared with the prior art, the organic matter content of gas discharged by the ethylene-propylene device can be reduced, meanwhile organic matter by-products are obtained. The energy-saving, cost-reducing, environmental protection and economic purposes are achieved, and good economic benefits are obtained. In addition, the technological process is simple, operation is stable, and the method has generalization performance.
Description
Technical field
The present invention relates to tail gas recycle technical field, the method that specifically a kind of ethylene, propylene device exhaust is reclaimed.
Background technology
In traditional petrochemical plant, ethene, propylene unit can to discharging substantial amounts of tail gas containing organic matter outside device,
For example：Ethene, ethane, propylene, propane, butylene, butane etc., not only cause environmental pollution, and cause above-mentioned available resources
Cause to waste, it is both uneconomical or not environmentally.
In recent years, with the enhancing of people's environmental consciousness, the international and domestic environmental requirement for petrochemical plant is carried
Height, and recycled from waste recovery, production cost is reduced, it is that enterprise creates consideration, ethene, propylene in economic benefit higher
The technique that device exhaust is reclaimed all has great Social benefit and economic benefit.
Vacuum Pressure Swing Adsorption Vacuum Pressure Swing Absorption, abbreviation VPSA, utilize and vacuumize
The partial pressure of the adsorbed component of method reduction, makes the component of absorption desorb under negative pressure.
The content of the invention
The purpose of the present invention is to overcome the deficiencies in the prior art, by the organic matter in ethene, propylene unit tail gas by true
The method of empty pressure-variable adsorption is reclaimed so that the content of organic matter meets the mark of environment protection emission in the final outer exhaust of device
Standard, and can guarantee that good economic benefit.
Above-mentioned purpose is realized, a kind of method that ethylene, propylene device exhaust is reclaimed is designed, it is characterised in that be main using such as
Lower process step：
A, emission mixing：Ethylene unit enters height with the high pressure exhaust gas in the emission of propylene unit after decompression
In pressure tail gas buffer；In low-pressure tail gas and two sections of VPSA concentrates treatment in the emission of ethylene unit and propylene unit
After displacement gas in discharge gas and two sections of VPSA concentrates treatment enter low-pressure tail gas surge tank together, then enter after blower fan pressurization
High pressure exhaust gas surge tank；High pressure exhaust gas and voltage stabilizing is carried out in high pressure exhaust gas surge tank and fill by the low-pressure tail gas that blower fan boosts
Divide and mix to obtain hydrocarbonaceous tail-gas；
B, one section of VPSA concentrates treatment：Mixed hydrocarbonaceous tail-gas feeding is made up of some one section of adsorption tower parallel connections
One section of adsorption tower group carries out one section of VPSA concentrates treatment, obtains one section intermediate products gas of the C2+ concentration of component 50% or so；
C, two sections of VPSA concentrates treatment：One section of intermediate products pneumatic transmission is entered two sections be made up of some two sections of adsorption tower parallel connections
Adsorption tower group carries out two sections of VPSA concentrates treatment, further by C2+ component concentrates to more than 95%, in two sections of VPSA concentrates treatment
Two sections discharge gas return emission mixing section low-pressure tail gas surge tanks in be circulated treatment, it is to avoid two sections of VPSA concentrates
The loss of the C2+ components in treatment.
Described one section of VPSA concentrate treatment is to be handled as follows：
B1, mixed hydrocarbonaceous tail-gas are entered from the raw material air inlet of one section of adsorption tower, at ambient pressure, tail containing the hydrocarbon gas
Gas flows through one section of adsorbent bed of adsorption tower, and C2+ components therein are adsorbed by adsorbent, not to be adsorbed including C1、N2、H2
Discharge gas from the tower top discharge of one section of adsorption tower, scene emptying；When the mass-transfer zone forward position of adsorbed C2+ components reaches absorption
During bed outlet, one section of adsorption tower stops absorption, and the adsorbent bed of one section of adsorption tower starts to be transferred to regenerative process；
B2, one section of drop pressure regeneration treatment：After the adsorption treatment of one section of adsorption tower terminates, along absorption direction by one
Section adsorption tower in including C1、N2、H2Light-component gas send into one section of adsorption tower group complete regeneration and pressure ratio should
In another low one section of adsorption tower of one section of adsorption tower, two one section of pressure equalizings of adsorption tower are realized, in one section of adsorption tower group
By that analogy, by pressure equalizing several times, make the pressure of one section of adsorption tower gradually reduces some other one section of adsorption towers, and
H in one section of adsorption tower group2、N2、CH4Component is constantly successively decreased, and C2+ concentration of component is improved constantly；
B3, one section vacuumize regeneration treatment：After the treatment of drop pressure several times of each one section of adsorption tower terminates, to make one
Adsorbent in section adsorption tower is thoroughly regenerated, with vavuum pump against one section of absorption direction of adsorption tower to one section of adsorption tower
Adsorbent bed vacuumized, the C2+ components for enabling adsorbent bed to adsorb thoroughly are desorbed, and obtain product in the middle of described one section
Product gas, one section of intermediate products gas enters in one section of intermediate products gas surge tank；
B4, one section of boost pressure regeneration treatment：After one section of adsorption tower completes one section vacuumizes regeneration treatment, with from one
Need to carry out one section of drop pressure is processed and one section of adsorption tower group higher than its pressure after completing absorption in section adsorption tower group
In in other section of adsorption tower discharge including C1、N2、H2Light-component gas to boosting when the last period adsorption tower；One section
Some other one section of adsorption towers by that analogy, are processed by continuous boost pressure between one section of adsorption tower several times in adsorption tower group
Afterwards, the pressure in the last period adsorption tower is deserved once more close to adsorptive pressure；
B5, one section of final boosting treatment：After the completion of one section of boost pressure treatment, one section of pressure of adsorption tower is not also complete
Adsorptive pressure is reached, in order that one section of adsorption tower can smoothly switch to absorption next time, it is necessary to discharge gas by one with one section
The pressure of section adsorption tower rises to adsorptive pressure, and adsorption tower just completes one complete " adsorption-regeneration " and follows after this process
Ring, and to adsorb ready next time.
One section of described adsorption tower group is provided with one section of adsorption tower of several parallel connections several section of adsorption tower alternately
" adsorption-regeneration " treatment, that realizes hydrocarbon component is continuously separated recovery.
Described two sections of VPSA concentrates treatment refers to be handled as follows one section of intermediate products gas successively：
C1, two sections of adsorption treatments：One section of intermediate products gas of output is adsorbed from two sections in one section of intermediate products gas surge tank
The air inlet pipe of tower enters, and at ambient pressure, one section of intermediate products gas flows through two sections of adsorbent beds of adsorption tower, C2+ components quilt therein
Adsorbent in it is absorbed；Two sections of discharge gas not to be adsorbed then return to the low-pressure tail gas surge tank of emission mixing section
In, to ensure the rate of recovery of the active princlple C2+ components of product gas in two sections of adsorption towers；
After the mass-transfer zone forward position of adsorbed C2+ components reaches two sections of the two of adsorption tower sections of adsorbent beds to be exported, this two sections
Adsorption tower stops absorption, and two sections of adsorbent beds start to be transferred to regenerative process；
C2, two sections of drop pressure treatment：After the adsorption treatment of two sections of adsorption towers terminates, will be current along absorption direction
In two sections of adsorption towers including C1、N2、H2Light-component gas, send into two sections of adsorption tower groups and complete regeneration and pressure
In another two sections of adsorption towers lower than two sections of current adsorption towers, two pressure equalizings of adsorption tower are realized；Make current two
The pressure of section adsorption tower is gradually reduced, and in current two sections of adsorption tower groups including H2、N2、CH4Light component constantly pass
Subtract, C2+ concentration of component is further improved；
C3, replacement Treatment：Replacement Treatment in two steps,
Replace a step：After the drop pressure treatment of two sections of current adsorption towers terminates, by two sections of adsorption tower groups
Enter the two step displacement gas discharged in another two sections of adsorption towers of the step of line replacement two to enter from the bottom of two sections of current adsorption towers,
Realize to when the first two section of displacement of adsorption tower improves product gas concentration, while realizing what two sections of current adsorption towers were boosted
Purpose；
Replace two steps：By the product gas of output in two sections of adsorption tower groups from two sections of adsorption towers for just completing to replace a step
Bottom enters, and carries out the displacement from bottom of towe to tower top, and the step displacement gas of a part two for displacing first pass through two sections of current absorption
Column overhead is expelled to low-pressure tail gas surge tank, and then the step displacement gas of another part two are discharged from the tower top of two sections of current adsorption towers
Two sections of adsorption towers to another completion drop pressure enter the step of line replacement one；
By after displacement, the C2+ concentration of component in two sections of current adsorption towers reaches more than 95%；
C4, two sections vacuumize regeneration treatment：After replacement Treatment terminates, to make the adsorbent in two sections of adsorption towers obtain thoroughly
Two sections of the two of adsorption tower sections of adsorbent beds are vacuumized by ground regeneration with the second vavuum pump against absorption direction, make the hydrocarbon of absorption
Class component is able to thoroughly desorb and obtains two sections of Vacuum solutions air-breathings, and two sections of Vacuum solutions air-breathings enter two sections as two sections of product gas
In product gas surge tank；
C5, two sections of boost pressure treatment：After the completion of vacuumizing regeneration treatment at two sections, with from two sections of adsorption tower groups
, two sections of adsorption towers are boosted higher than other two sections of gases of adsorption tower of its pressure, two sections of boost pressures treatment
Corresponding with two sections of drop pressure treatment, two sections of pressure of adsorption tower are once more close to adsorptive pressure；
C6, two sections of final boosting treatment：After the completion of two sections of boost pressure treatment, in order that two sections of adsorption towers can be steady
Switch to absorption next time, it is necessary to two sections of discharge gas in being processed with two sections of VPSA concentrates will work as the first two section of pressure of adsorption tower
Adsorptive pressure is risen to, two sections of adsorption towers just complete complete " adsorption-regeneration " circulation, and are carried out to adsorb next time
Prepare.
Described vavuum pump and the second vavuum pump also share an appendage vacuum pump.
The present invention compared with prior art, can reduce the content of organic matter in exhaust outside ethene, propylene unit, while obtaining
Organic matter byproduct, realizes energy-saving, environmental protection and economy purpose, and obtain good economic benefit；While its technique stream
Journey is simple, stable operation, with replicability.
Brief description of the drawings
Fig. 1 is total process flow diagram of the invention.
Fig. 2 is total equipment connection diagram that technological process is realized in the embodiment of the present invention.
Fig. 3 is the equipment connection diagram that emission hybrid technique is realized in the embodiment of the present invention.
Fig. 4 is to realize one section of connection diagram of VPSA concentrate handling process in the embodiment of the present invention.
Fig. 5 is to realize two sections of connection diagrams of VPSA concentrate handling process in the embodiment of the present invention.
Referring to Fig. 2,1-1 is low-pressure tail gas surge tank；1-2 is high pressure exhaust gas surge tank；1-3 is that one section of intermediate products gas delays
Rush tank；1-4 is two sections of product gas surge tanks；2-1 is blower fan；2-2 is vavuum pump；2-3 is the second vavuum pump；3-1 is one section of suction
Attached tower group；3-2 is two sections of adsorption tower groups；
Referring to Fig. 4,51-1 is one section of inlet manifold；51-2 is one section of row's air escape main；51-3 is house steward Duan Yijun；
51-4 is house steward Duan Erjun；51-51 is one section of intermediate products gas house steward；51-52 is another one section of intermediate products gas house steward；
51-6 is one section of final rise pipe；51-7 vacuumizes shunt valve for one section, and 51-1-1~51-1-6 is respectively unstripped gas air intake branch；
51-2-1~51-2-6 is respectively one section of discharge gas branch pipe；51-3-1~51-3-6 is respectively one section of one equal branch pipe；51-4-1~
51-4-6 is respectively one section of two equal branch pipe；51-5-1~51-5-6 is one section of intermediate products gas branch pipe；
Referring to Fig. 5,52-1 is two sections of inlet manifolds；52-2 is two sections of row's air escape mains；52-3 presses house steward for two sections；
52-4 is two sections of two step top house stewards of displacement；52-5 is two sections of one step top house stewards of displacement；52-61 is two sections of product gas house stewards；52-62
It is another two sections of product gas house stewards；52-7 is two sections of one step bottom house stewards of displacement；52-8 is two sections of two step bottom house stewards of displacement；52-9
It is two sections of final rise pipes；52-10 vacuumizes shunt valve for two sections；52-11 vacuumizes standby pipe for two sections；52-1-1~52-1-6 points
Wei not two sections of air intake branches；52-2-1~52-2-6 is respectively two sections of discharge gas branch pipes；52-3-1~52-3-6 is respectively two sections
Press branch pipe；52-4-1~52-4-6 is respectively two sections of two step topmast pipes of displacement；52-5-1~52-5-6 is respectively two sections of displacements
One step topmast pipe；52-6-1~52-6-6 is respectively two sections of product gas branch pipes；52-7-1~52-7-6 is respectively two sections of displacements one
Step bottom branch pipe；52-8-1~52-8-6 is respectively two sections of two step bottom branch pipes of displacement.
Specific embodiment
The present invention is further described in conjunction with accompanying drawing.
The present invention is using oneself original technical advantage in terms of pressure-variable adsorption, in further investigation petrochemical plant
After ethene, the composition of propylene unit tail gas, feature etc., new technological process is developed, by the organic matter in tail gas --- second
Alkene, ethane, propylene, propane, butylene, butane etc. are reclaimed by the method for Vacuum Pressure Swing Adsorption so that final outer of device
The content of organic matter meets the standard of environment protection emission in exhaust --- discharge standard of air pollutants GB 16297-1996's
Meanwhile, the byproduct of organic matter is also obtained, obtain good economic benefit.
Embodiment 1
Referring to Fig. 1 and Fig. 2, the method that a kind of ethylene, propylene device exhaust of the invention is reclaimed, it is characterised in that main to use
Following process step：
A, emission mixing：Ethylene unit enters height with the high pressure exhaust gas in the emission of propylene unit after decompression
In pressure tail gas buffer 1-1；Low-pressure tail gas and two sections of VPSA concentrates treatment in the emission of ethylene unit and propylene unit
In discharge gas and the treatment of two sections of VPSA concentrates in displacement gas enter low-pressure tail gas surge tank 1-1 together after, then through blower fan 2-1
Enter high pressure exhaust gas surge tank 1-2 after pressurization；High pressure exhaust gas and by blower fan boost low-pressure tail gas in high pressure exhaust gas surge tank
Voltage stabilizing is carried out in 1-2 and hydrocarbonaceous tail-gas are sufficiently mixed to obtain；
B, one section of VPSA concentrates treatment：Mixed hydrocarbonaceous tail-gas feeding is made up of some one section of adsorption tower parallel connections
One section of adsorption tower group 3-1 carries out one section of VPSA concentrates treatment, obtains one section intermediate products of the C2+ concentration of component 50% or so
Gas；
C, two sections of VPSA concentrates treatment：One section of intermediate products pneumatic transmission is entered two sections be made up of some two sections of adsorption tower parallel connections
Adsorption tower group 3-2 carries out two sections of VPSA concentrates treatment, further by C2+ component concentrates to more than 95%, at two sections of VPSA concentrates
Treatment is circulated in two sections of low-pressure tail gas surge tank 1-1 of discharge gas return emission mixing section in reason, it is to avoid two sections
The loss of the C2+ components in the treatment of VPSA concentrates.
Its specific embodiment is as follows：
1st, discharge gas mixing：
Referring to Fig. 3, ethene, the high pressure exhaust gas of propylene unit output enter high pressure exhaust gas surge tank 1-2 after pressure-reduced and-regulated
In；Ethene, the low-pressure hydrocarbon-contained gas of propylene unit output, other two sections of displacement gas of discharge gas and concentration unit, discharge gas etc.
Low-pressure tail gas are first sent into after be sufficiently mixed in low-pressure tail gas surge tank 1-1, then send into high pressure exhaust gas after being pressurized through blower fan 2-1
Mix with the above-mentioned high pressure exhaust gas after decompression in surge tank 1-2.
After the unstripped gas that above-mentioned various high pressure exhaust gas and low-pressure tail gas are constituted is sufficiently mixed in high pressure exhaust gas surge tank 1-2
One section of adsorption tower group 3-1 of feeding.
2nd, one section of VPSA concentrates treatment：
Referring to Fig. 4,6 one section of adsorption tower 3-1-1~3-1-6 in parallel are respectively in figure from left to right；In one section of air inlet
6 unstripped gas air intake branch 51-1-1~51-1-6 of parallel connection on house steward 51-1,6 unstripped gas air intake branches are adsorbed with one section respectively
The bottom of 6 corresponding one section of adsorption towers is connected in tower group 3-1；Unstripped gas is entered by one section of inlet manifold 51-1, and is passed through
Unstripped gas air intake branch enters in corresponding one section of adsorption tower；
6 one section of tops of adsorption tower in one section of adsorption tower group 3-1 are correspondingly provided with one section of discharge gas branch pipe 51-2- respectively
1~51-2-6；6 one section of discharge gas branch pipes are connected in parallel on one section of row's air escape main 51-2 respectively；By one section of adsorption tower group 3-1
One section of discharge gas after treatment enters back into one section of row's air escape main 51-2 through one section of discharge gas branch pipe；
Discharged at one section on gas branch pipe 51-2-1~51-2-6 and be also correspondingly provided with one section of one equal branch pipe 51-3-1~51- respectively
3-6；The port of export of one section of one equal branch pipe is connected in parallel on a house steward Duan Yijun 51-3；
Discharged at one section on gas branch pipe 51-2-1~51-2-6 and be also connected respectively one section of two equal branch pipe 51-4-1~51-
The entrance point of 4-6, the port of export of one section of two equal branch pipe 51-4-1~51-4-6 is connected in parallel on a house steward Duan Erjun 51-4 respectively
On；
One section of final rise pipe 51-6 is provided between arranging an air escape main 51-2 and house steward Duan Yijun 51-3 at one section, for one
The final rise of section adsorption tower；
One section of intermediate products gas branch pipe 51-5-1~51-5-6 is accordingly connected on 6 unstripped gas air intake branch 51-1-1 respectively
One end, wherein the other end of three one section of intermediate products gas branch pipe 51-5-1~51-5-3 to be connected in parallel on one section of intermediate products gas total
On pipe 51-51, the other end for being left three one section of intermediate products gas branch pipe 51-5-4~51-5-6 is connected in parallel in another section
Between on product gas house steward 51-52, one section of intermediate products gas house steward 51-51 and another section of intermediate products gas house steward 51-52 points
Input not with vavuum pump 2-2 is connected, and the output end of vavuum pump 2-2 reconnects one section of intermediate products gas surge tank 1-3；One section
Between intermediate products gas house steward 51-51 and another section of intermediate products gas house steward 51-52 shunt valve 51- is vacuumized by one section
7 connections.In order to meet the demand of big flow in this example, vavuum pump 2-2 is provided with 3；
Described one section of unstripped gas air intake branch 51-1-1~51-1-6, one section of discharge gas branch pipe 51-2-1~51-2-6,
One section of one equal branch pipe 51-3-1~51-3-6, one section of two equal branch pipe 51-4-1~51-4-6, one section of intermediate products gas branch pipe 51-5-
1~51-5-6, one section vacuumize shunt valve 51-7, on be respectively equipped with sequencing valve；
Now by taking the one one section of adsorption tower 3-1-1 as an example, one section of VPSA concentrate treatment step program process of main flow is described, remaining
5 one section of technical process of adsorption tower are identical with the one one section of adsorption tower 3-1-1：
B1, one section of adsorption treatment：
The unstripped gas exported after being sufficiently mixed through high pressure exhaust gas surge tank 1-2, enters through unstripped gas air intake branch 51-1-1
In one one section of adsorption tower 3-1-1, various adsorbents that wherein C2+ components are loaded in the one one section of adsorption tower 3-1-1 are successively
Absorb, gas not to be adsorbed is then as one section of discharge gas through the one one section of one section of discharge gas branch pipe of absorption column overhead
It is vented through one section of row's air escape main 51-2 after 51-2-1；The small part of one section of discharge gas is used for follow-up one section of final rise treatment step
Suddenly.
With the carrying out of absorption, when the forward position of C2+ components, that is, adsorb forward position and rise to close to one section of certain height of adsorbent bed
Degree, the sequencing valve closed on unstripped gas air intake branch 51-1-1 and one section of discharge gas branch pipe 51-2-1, tower stops absorption.This
When, one section of adsorbent of unadsorbed saturation is also left between absorption forward position and adsorbent bed outlet, referred to as reserve section.
B2, one section of drop pressure regeneration treatment：
B21, the one one section of drop pressure treatment, hereinafter referred to as " one down "：After the completion of adsorption process, the 1st is opened
Section adsorption tower 3-1-1 tower tops one section of one equal branch pipe 51-3-1 on sequencing valve and the 2nd 1 section the one of adsorption tower 3-1-2 tower tops
Sequencing valve on Duan Yijun branch pipes 51-3-2, by the C of elevated pressures in the one one section of adsorption tower 3-1-11、N2、H2Etc. light component gas
Body is put into and just completes during one section of boost pressure is processed in two the 2nd 1 section of adsorption tower 3-1-2 of liter step, until the 1st
Section adsorption tower 3-1-1 and the 2nd 1 section of adsorption tower 3-1-2 between pressure it is of substantially equal untill.The one one section in this course
The absorption forward position of adsorption tower 3-1-1 will continue to elapse forward, but still not up to export.
B22, the 2nd 1 section of drop pressure treatment, hereinafter referred to as " two down "：After the completion of one down process, first is opened
Sequencing valve on one section of one section two of adsorption tower 3-1-1 tower tops equal branch pipe 51-4-1 and May Day section adsorption tower 3-1-5 tower tops
Sequencing valve on one section of two equal branch pipe 51-4-5, by the C of elevated pressures in the one one section of adsorption tower 3-1-11、N2、H2Etc. light component
Gas is put into May Day section adsorption tower 3-1-5 for just completing to vacuumize, and for May Day section adsorption tower 3-1-5 two rise.
B3, one section vacuumize regeneration treatment：
After the completion of two down, open on the one one section of one section of intermediate products gas branch pipe 51-5-1 of adsorption tower 3-1-1 bottom of towe
Sequencing valve, the one one section of adsorption tower 3-1-1 is vacuumized, at this moment adsorbed C2+ components are largely desorbed, and are passed through
One section of intermediate products gas house steward 51-51 is put into one section of intermediate products gas surge tank 1-3 against absorption direction through vavuum pump 2-2-1
In.Vacuumize the sequencing valve closed on one section of intermediate products gas branch pipe 51-5-1 after the completion of step sequence, the one one section of adsorption tower 3-1-1
Into wait state.
During one section vacuumizes regenerative process, the one one section of adsorption tower to the 3rd 1 section of adsorption tower 3-1-1~3-1-3 passes through one
Section intermediate products gas house steward 51-51 is connected with 3 vavuum pump 2-2；4th 1 section of adsorption tower to the 6th 1 section of adsorption tower 3-1-4~
3-1-6 is connected by another section of intermediate products gas house steward 51-52 with vavuum pump 2-2-1~2-2-3；When there is failsafe valve etc.
When situation occurs, can be by opening one section of sequencing valve vacuumized on shunt valve 51-7, realization vacuumizes continuous.
B4, one section of boost pressure regeneration treatment：
B41, the 2nd 1 section of boost pressure treatment, hereinafter referred to as " two rise "：
After one one section of adsorption tower 3-1-1 vacuumizes end, into after wait step sequence, by opening the one one section of absorption
One section one of sequencing valve on one section of one equal branch pipe 51-3-1 of tower 3-1-1 tower tops and May Day section adsorption tower 3-1-5 tower tops is equal
Sequencing valve on branch pipe 51-3-5, using the C of May Day section adsorption tower 3-1-5 elevated pressures in two down1、N2、H2Etc. light group
Gas etc. is divided to boost the one one section of adsorption tower 3-1-1.
B42, the one one section of boost pressure treatment, hereinafter referred to as " one rises "：
After the completion of being boosted two, by opening the one one section of one section two of adsorption tower 3-1-1 tower tops equal branch pipe 51-4-1
On sequencing valve and the 3rd 1 section of one section two of adsorption tower 3-1-3 tower tops equal branch pipe 51-4-3 on sequencing valve, by the 3rd 1 section
The C of higher pressure in adsorption tower 3-1-31、N2、H2Put into Deng light-component gas and just complete two the one one section of adsorption towers for rising
Interior 3-1-1 is boosted.
B5, one section of final boosting treatment：
By the way that after boost pressure process twice, pressure is still not up to adsorptive pressure in the one one section of adsorption tower 3-1-1.This
When open sequencing valve on the one one section of one section one of adsorption tower 3-1-1 tower tops equal branch pipe 51-3-1, and one section of final rise pipe 51-
Regulating valve on 6, with C not to be adsorbed1、N2、H2The one one section of adsorption tower 3-1-1 is slowly risen Deng light-component gas etc.
Pressure, untill the one one section of adsorption tower 3-1-1 pressure rises to adsorptive pressure.
By after a series of above-mentioned this step-down and boost process, adsorption tower just completes whole regenerative process, is next time
Absorption is got ready and hence into next sorption cycle.
Second to the 6th 1 section of technique step sequence of adsorption tower 3-1-2~3-1-6 and the one one section of technique of adsorption tower 3-1-1
All it is identical, simply stagger 1 adsorption time successively in the run time of each step sequence, and be so achieved that has all the time
1 one section of adsorption tower is in adsorbed state, and remaining 5 one section of adsorption tower is respectively at different reproduced states, it is ensured that raw material
Gas is continuously separated and purification.
3rd, two sections of VPSA concentrates treatment
Referring to Fig. 5, the one or two section of adsorption tower 3-2-1~six or two section adsorption tower 3- in parallel is respectively in figure from left to right
2-6；Unstripped gas is inhaled by two sections of inlet manifold 52-1 through two sections of air intake branch 52-1-1~52-1-6 and first~six or two section
The bottom of attached tower 3-2-1~3-2-6 is connected；
By two sections of discharge gas after two sections of adsorption tower group treatment from the first~6th 2 section of adsorption tower 3-2-1~3-2-6
Top, arrange air escape main 52-2 with two sections by two sections of discharge gas branch pipe 52-2-1~52-2-6 and be connected；
First~6th 2 section of adsorption tower 3-2-1~3-2-6 tower top, two sections of pressure branch pipe 52-3-1~52-3-6 connect respectively
It is connected on the first~6th 2 section of two sections of the top of adsorption tower 3-2-1~3-2-6 discharge gas branch pipe 52-2-1~52-2-6, two sections
The port of export of pressure branch pipe 52-3-1~52-3-6 is connected on two sections of pressure house steward 52-3；
Being arranged at two sections between air escape main 52-2 and two sections of pressure house steward 52-3 has two sections of final rise pipe 52-9, for two sections
The final rise of adsorption tower；
First~6th 2 section of tower top of adsorption tower 3-2-1~3-2-6, two sections of displacement one step topmast pipe 52-5-1~52-
5-6 be connected to two sections of discharge gas branch pipe 52-2-1 at the first~6th 2 section of top of adsorption tower 3-2-1~3-2-6~
On 52-2-6, two sections that the port of export of two sections of displacement one step topmast pipe 52-5-1~52-5-6 is connected to replace a step top house stewards
On 52-5；Two sections of one step top adjusted valves of house steward 52-5 of displacement are connected with two sections of one step bottom house steward 52-7 of displacement；
First~6th 2 section of adsorption tower 3-2-1~3-2-6 tower top, two sections of displacement two step topmast pipe 52-4-1~52-4-6
Connect one to one respectively and discharged on gas branch pipe 52-2-1~52-2-6 at two sections, two sections of two step topmast pipe 52-4-1 of displacement~
The port of export of 52-4-6 is connected in parallel on two sections of step top house steward 52-4 of displacement two respectively；Two sections of displacements two step top house steward 52-4 and low pressure
Tail gas buffer 1-1 is connected；
First~6th 2 section of adsorption tower 3-2-1~3-2-6 bottom of towe, two sections of product gas branch pipe 52-6-1~52-6-6 difference
Connect one to one on two sections of air intake branch 52-1-1~52-1-6, afterwards by two sections of product gas house steward 52-6-11 with it is another
One two sections of product gas house steward 52-6-12 is connected with the second vavuum pump 2-3；
First~6th 2 section of adsorption tower 3-2-1~3-2-6 bottom of towe, the two sections of step bottom branch pipe 52-7-1 of displacement one~52-7-6
It is connected on the first~6th 2 section of two sections of the bottom of adsorption tower 3-2-1~3-2-6 air intake branch 52-1-1~52-1-6,
The port of export of the two sections of step bottom branch pipe 52-7-1 of displacement one~52-7-6 is connected in parallel on the step bottom house steward 52-7 of two sections of displacements one respectively；
First~6th 2 section of adsorption tower 3-2-1~3-2-6 bottom of towe, two sections of product gas surge tank 1-4 and two sections of displacements two
The adjusted valve connections of house steward 52-8 of step bottom；The two sections of step bottom branch pipe 52-8-1 of displacement two~52-8-6 are connected to the first~the 6th
On two sections of two sections of the bottom of adsorption tower 3-2-1~3-2-6 air intake branch 52-1-1~52-1-6, two sections of two step bottom branch pipes of displacement
The port of export of 52-8-1~52-8-6 is connected in parallel on two sections of step bottom house steward 52-8 of displacement two respectively；
On two sections of air intake branch 52-1-1~52-1-6, two sections of discharge gas branch pipe 52-2-1~52-2-6, two sections press
Sequencing valve is set on branch pipe 52-3-1~52-3-6, two sections of displacement one step topmast pipe 52-5-1~52-5-6；Two sections of one steps of displacement
Topmast pipe 52-5-1~52-5-6, two sections of displacement two step topmast pipe 52-4-1~52-4-6, two sections of product gas branch pipe 52-6-1~
On 52-6-6, the two sections of step bottom branch pipe 52-7-1 of displacement one~52-7-6, the step bottom branch pipe 52-8-1 of two sections of displacements two~52-8-6 point
Corresponding sequencing valve is not provided with；
Now by taking the one or two section of adsorption tower 3-2-1 as an example, two sections of VPSA concentrate process steps of main flow, the second~the are described
Six or two sections of technical process of adsorption tower 3-2-1~3-2-6 are identical with the one or two section of adsorption tower 3-2-1：
C1, two sections of adsorption treatments：
One section of intermediate products gas after being processed through one section of VPSA concentrate, the one or two section is entered through two sections of air intake branch 52-1-1
In adsorption tower 3-2-1, wherein C2+ components are adsorbed successively by the various adsorbents loaded in the one or two section of adsorption tower 3-2-1, not by
The gas of absorption then discharges gas after the one or two section of two sections of discharge gas branch pipe 52-2-1 of absorption column overhead through two sections as two sections
Row air escape main 52-2 is emitted into low-pressure tail gas surge tank 1-1；The small part of two sections of discharge gas is used for follow-up two sections finally
Boosting process step.
With the carrying out of absorption, when the forward position of C2+ components, that is, adsorb forward position and rise to close to two sections of certain height of adsorbent bed
Degree, the sequencing valve closed on two sections of air intake branch line 52-1-1 and two sections of discharge gas branch pipe 52-2-1, tower stops absorption.This
When, one section of adsorbent of unadsorbed saturation is also left between absorption forward position and two sections of adsorbent beds outlets, referred to as reserve section.
C2, two sections of drop pressure treatment：
After the completion of adsorption process, open on the one or two section two sections of adsorption tower 3-2-1 tower tops pressure branch pipe 52-3-1
Sequencing valve and the two or two section of two sections of adsorption tower 3-2-2 tower top press the sequencing valve on branch pipe 52-3-2, by the one or two section of adsorption tower
Two sections of discharge gas of elevated pressures are put into the two or two section of adsorption tower 3-2-2 for just completing vacuumize process in 3-2-1, until
Untill pressure between one or two section of adsorption tower 3-2-1 and the two or two section of adsorption tower 3-2-2 is of substantially equal.In this course,
One or the two section of absorption forward position of adsorption tower 3-2-1 will continue to elapse forward, but still not up to export.
C3, replacement Treatment：
C31, one step of displacement：After two sections of drop pressure treatment terminate, still suffered from the one or two section of adsorption tower 3-2-1 a small amount of
C1、N2、H2Deng the non-product gas such as light-component gas.Open the one or two section of two sections of one step bottom branch pipes of displacement of adsorption tower 3-2-1 bottom of towe
Two sections of sequencing valves of one step topmast pipe 52-5-6 of displacement of 52-7-1 and the 6th 2 section of adsorption tower 3-2-6 tower top, and two sections put
The regulating valve changed between a step top house steward 52-5 and two sections of step bottom house steward 52-7 of displacement one, using entering the of the step of line replacement two
Product gas in six or two sections of adsorption tower 3-2-6 enter line replacement and boosting to the one or two section of adsorption tower 3-2-1.
C32, two steps of displacement：Replace two steps and include two processes, first the first process, after the completion of a step is replaced, open
Two sections of upper regulating valves being connected with two sections of product gas surge tank 1-4 of the step bottom house steward 52-8 of displacement two, two sections replace two step bottom branch pipes
Sequencing valve on sequencing valve on 52-8-1, and two sections of two step topmast pipe 52-4-1 of displacement, with two sections of product gas surge tank 1-4
Two sections of interior product gas, enter line replacement, displacement gas from two sections of adsorption tower bottom of towe to tower top to the one or two section of adsorption tower 3-2-1 bed
Two sections of two step topmast pipe 52-4-1 of displacement from the top of the one or two section of adsorption tower 3-2-1 are arranged through two sections of step top house steward 52-4 of displacement two
Into low-pressure tail gas surge tank 1-1；
Then the second process, closes on the one or two section of two sections of two step topmast pipe 52-4-1 of displacement of adsorption tower 3-2-1 tower tops
Sequencing valve, while open the sequencing valves on two sections of one step topmast pipe 52-5-1 of displacement of the one or two section of adsorption tower 3-2-1 tower top,
Regulating valve and the four or two section of adsorption tower between two sections of one step top house steward 52-5 of displacement of connection and two sections of step bottom house steward 52-7 of displacement one
Two sections of one step bottom branch pipe 52-7-4 of displacement of 3-2-4 bottom of towe, with the product gas in the one or two section of adsorption tower 3-2-1 to the four or two section
Adsorption tower 3-2-4 enters line replacement and boosting；
C4, two sections vacuumize regeneration treatment：
By after replacement Treatment, C2+ components concentrate is to more than 95% in the one or two section of adsorption tower 3-2-1.Open the one or two
Sequencing valve on two sections of product gas branch pipe 52-6-1 of section adsorption tower 3-2-1 bottom of towe, takes out to the one or two section of adsorption tower 3-2-1
Vacuum, at this moment, adsorbed C2+ component products gas is largely desorbed, by two sections of product gas house steward 52-61 against absorption
Direction the second vavuum pump 2-3 is put into two sections of product gas surge tank 1-4.Vacuumize two sections of product gas branch of closing after the completion of step sequence
Sequencing valve on pipe 52-6-1, the one or two section of adsorption tower 3-2-1 enters wait state.
Vacuumize in regenerative process, the one or two section of adsorption tower to the three or two section of adsorption tower 3-2-1~3-2-3 is by two sections of products
Product gas house steward 52-62 is connected with vavuum pump 2-3-1~2-3-2；Four or two section of adsorption tower is to the six or two section of adsorption tower 3-2-4~3-
2-6 is connected by another two sections of product gas house steward 52-62 with the second vavuum pump 2-3, and 2 the second vavuum pump 2- are used in this example
3；When occurring situations such as having failsafe valve, can realize taking out by opening two sections of sequencing valves vacuumized on shunt valve 52-10
Vacuum is continuous.Meanwhile, two sections of product gas house steward 52-61 and another two sections of product gas house steward 52-62 are vacuumized standby by two sections
It is connected with vavuum pump 2-2 with pipe 52-11, in 3 used in this example vavuum pumps 2-2, there is standby two sections of a vavuum pump 2-2
VPSA devices.
C5, two sections of boost pressure treatment：After the completion of two sections vacuumize regeneration process, by opening the one or two section of absorption
Two sections of tower 3-2-1 tower tops press sequencing valve on branch pipe 52-3-1 and the three or two section two sections of adsorption tower 3-2-3 tower tops are pressed
Sequencing valve on branch pipe 52-3-3, is inhaled using two sections of exhausts of elevated pressures in the three or two section of adsorption tower 3-2-3 to the one or two section
Attached tower 3-2-1 is boosted.
C6, two sections of final boosting treatment：
By the way that after boost pressure process, pressure is still not up to adsorptive pressure in the one or two section of adsorption tower 3-2-1.At this moment beat
The sequencing valve on the one or two section two sections of adsorption tower 3-2-1 tower tops pressure branch pipe 52-3-1 is driven, and on two sections of final rise pipe 52-9
Regulating valve, the one or two section of adsorption tower 3-2-1 is slowly boosted with two sections of discharges gas not to be adsorbed etc., until the one or two
Untill section adsorption tower 3-2-1 pressure rises to adsorptive pressure.
By after a series of above-mentioned this step-down and boost process, the one or two section of adsorption tower 3-2-1 just completes whole regeneration
Process, is that absorption is got ready and hence into next sorption cycle next time.
It is all phase that second~6th 2 section of technique of adsorption tower 3-2-2~3-2-6 walks sequence and the one or two section of adsorption tower 3-2-1
With, simply stagger 1 adsorption time successively in the run time of each step sequence, is so achieved that there is 1 two sections of suction all the time
Attached tower is in adsorbed state, and remaining 5 two sections of adsorption tower is respectively at different reproduced states, it is ensured that continuous point of unstripped gas
From with purification.
The present invention has that flow is simple, and stable operation is energy-saving, environmental protection and economy, the advantages of benefit is obvious.
Claims (5)
1. a kind of method that ethylene, propylene device exhaust is reclaimed, it is characterised in that mainly using following process step：
A, emission mixing：Ethylene unit enters high pressure tail with the high pressure exhaust gas in the emission of propylene unit after decompression
In gas surge tank (1-1)；In low-pressure tail gas and two sections of VPSA concentrates treatment in the emission of ethylene unit and propylene unit
Discharge gas and the treatment of two sections of VPSA concentrates in displacement gas enter low-pressure tail gas surge tank (1-1) together after, then through blower fan (2-
1) high pressure exhaust gas surge tank (1-2) is entered after pressurizeing；High pressure exhaust gas and the low-pressure tail gas boosted by blower fan delay in high pressure exhaust gas
Rushing carries out voltage stabilizing and is sufficiently mixed to obtain hydrocarbonaceous tail-gas in tank (1-2)；
B, one section of VPSA concentrates treatment：One section that mixed hydrocarbonaceous tail-gas feeding is made up of some one section of adsorption tower parallel connections
Adsorption tower group (3-1) carries out one section of VPSA concentrates treatment, obtains one section intermediate products gas of the C2+ concentration of component 50% or so；
C, two sections of VPSA concentrates treatment：One section of intermediate products pneumatic transmission is entered two sections of absorption being made up of some two sections of adsorption tower parallel connections
Tower group (3-2) carries out two sections of VPSA concentrates treatment, further by C2+ component concentrates to more than 95%, two sections of VPSA concentrates treatment
In two sections discharge gas return emission mixing section low-pressure tail gas surge tanks (1-1) in be circulated treatment, it is to avoid two sections
The loss of the C2+ components in the treatment of VPSA concentrates.
2. the method that a kind of ethylene, propylene device exhaust as claimed in claim 1 is reclaimed, it is characterised in that described one section
The treatment of VPSA concentrates is to be handled as follows：
B1, mixed hydrocarbonaceous tail-gas are entered from the raw material air inlet of one section of adsorption tower, at ambient pressure, hydrocarbonaceous tail-gas stream
One section of adsorbent bed of adsorption tower is crossed, C2+ components therein are adsorbed by adsorbent, it is not to be adsorbed including C1、N2、H2Row
Deflate from one section of tower top discharge of adsorption tower, scene emptying；Go out when the mass-transfer zone forward position of adsorbed C2+ components reaches adsorbent bed
During mouth, one section of adsorption tower stops absorption, and the adsorbent bed of one section of adsorption tower starts to be transferred to regenerative process；
B2, one section of drop pressure regeneration treatment：After the adsorption treatment of one section of adsorption tower terminates, one section is inhaled along absorption direction
In attached tower including C1、N2、H2Light-component gas send into one section of adsorption tower group and complete this section of regeneration and pressure ratio
In another low one section of adsorption tower of adsorption tower, two one section of pressure equalizings of adsorption tower are realized, in one section of adsorption tower group (3-1)
By that analogy, by pressure equalizing several times, make the pressure of one section of adsorption tower gradually reduces some other one section of adsorption towers, and
H in one section of adsorption tower group2、N2、CH4Component is constantly successively decreased, and C2+ concentration of component is improved constantly；
B3, one section vacuumize regeneration treatment：After the treatment of drop pressure several times of each one section of adsorption tower terminates, to make one section of suction
Adsorbent in attached tower is thoroughly regenerated, and one section is adsorbed against one section of absorption direction of adsorption tower with vavuum pump (2-2)
The adsorbent bed of tower is vacuumized, and the C2+ components for enabling adsorbent bed to adsorb thoroughly are desorbed, and obtains one section of described centre
Product gas, one section of intermediate products gas enters in one section of intermediate products gas surge tank (1-3)；
B4, one section of boost pressure regeneration treatment：After one section of adsorption tower completes one section vacuumizes regeneration treatment, with from one section of suction
Need to carry out one section of drop pressure is processed and one section of adsorption tower group (3- higher than its pressure after completing absorption in attached tower group
1) in other section of adsorption tower discharge including C1、N2、H2Light-component gas to boosting when the last period adsorption tower；One
Section adsorption tower group in some other one section of adsorption towers by that analogy, at continuous boost pressure between one section of adsorption tower several times
After reason, deserve the pressure in the last period adsorption tower once more close to adsorptive pressure；
B5, one section of final boosting treatment：After the completion of one section of boost pressure treatment, the pressure of one section of adsorption tower is not fully achieved also
Adsorptive pressure, in order that one section of adsorption tower can smoothly switch to absorption next time, it is necessary to be inhaled one section with one section of discharge gas
The pressure of attached tower rises to adsorptive pressure, and adsorption tower just completes complete " adsorption-regeneration " circulation after this process, and
To adsorb ready next time.
3. the method that a kind of ethylene, propylene device exhaust as claimed in claim 2 is reclaimed, it is characterised in that one section of described suction
Attached tower group (3-1) is provided with one section of adsorption tower of several parallel connections, several section of adsorption tower alternately " adsorption-regeneration " place
Reason, that realizes hydrocarbon component is continuously separated recovery.
4. the method that a kind of ethylene, propylene device exhaust as claimed in claim 2 is reclaimed, it is characterised in that described two sections
The treatment of VPSA concentrates refers to be handled as follows one section of intermediate products gas successively：
C1, two sections of adsorption treatments：One section of intermediate products gas of output is adsorbed from two sections in one section of intermediate products gas surge tank (1-3)
The air inlet pipe of tower enters, and at ambient pressure, one section of intermediate products gas flows through two sections of adsorbent beds of adsorption tower, C2+ components quilt therein
Adsorbent in it is absorbed；Two sections of discharge gas not to be adsorbed then return to the low-pressure tail gas surge tank of emission mixing section
In (1-1), to ensure the rate of recovery of the active princlple C2+ components of product gas in two sections of adsorption towers；
After the mass-transfer zone forward position of adsorbed C2+ components reaches two sections of the two of adsorption tower sections of adsorbent beds to be exported, this two sections absorption
Tower stops absorption, and two sections of adsorbent beds start to be transferred to regenerative process；
C2, two sections of drop pressure treatment：After the adsorption treatment of two sections of adsorption towers terminates, along absorption direction by current two sections
In adsorption tower including C1、N2、H2Light-component gas, send into two sections of adsorption tower groups complete regeneration and pressure ratio is worked as
In another low two sections of adsorption towers of two sections of preceding adsorption towers, two pressure equalizings of adsorption tower are realized；Inhale current two sections
The pressure of attached tower is gradually reduced, and in current two sections of adsorption tower groups including H2、N2、CH4Light component constantly successively decrease, C2+
Concentration of component is further improved；
C3, replacement Treatment：Replacement Treatment in two steps,
Replace a step：After the drop pressure treatment of two sections of current adsorption towers terminates, will be put in two sections of adsorption tower groups
Change the two step displacement gas discharged in another two sections of adsorption towers of two steps to enter from the bottom of two sections of current adsorption towers, it is right to realize
When the first two section of displacement of adsorption tower improves product gas concentration, while realizing the purpose boosted to two sections of current adsorption towers；
Replace two steps：By the product gas of output in two sections of adsorption tower groups from two sections of bottoms of adsorption tower for just completing to replace a step
Into, the displacement from bottom of towe to tower top is carried out, the step displacement gas of a part two for displacing first pass through two sections of current adsorption tower towers
Top is expelled to low-pressure tail gas surge tank (1-1), and then the step displacement gas of another part two are arranged from the tower top of two sections of current adsorption towers
Go out and enter the step of line replacement one to two sections of adsorption towers of another completion drop pressure；
By after displacement, the C2+ concentration of component in two sections of current adsorption towers reaches more than 95%；
C4, two sections vacuumize regeneration treatment：After replacement Treatment terminates, to make the adsorbent in two sections of adsorption towers obtain thoroughly again
It is raw, two sections of the two of adsorption tower sections of adsorbent beds are vacuumized against absorption direction with the second vavuum pump (2-3), make the hydrocarbon of absorption
Class component is able to thoroughly desorb and obtains two sections of Vacuum solutions air-breathings, and two sections of Vacuum solutions air-breathings enter two sections as two sections of product gas
In product gas surge tank (1-4)；
C5, two sections of boost pressure treatment：After the completion of vacuumizing regeneration treatment at two sections, with from two sections of adsorption tower groups, high
Two sections of adsorption towers are boosted in other two sections of gases of adsorption tower of its pressure, two sections of boost pressures are processed and two sections
Drop pressure treatment is corresponding, and two sections of pressure of adsorption tower are once more close to adsorptive pressure；
C6, two sections of final boosting treatment：After the completion of two sections of boost pressure treatment, in order that two sections of adsorption towers can smoothly be cut
Shift to adsorb next time, it is necessary to two sections of discharge gas in being processed with two sections of VPSA concentrates are by when the pressure of the first two section of adsorption tower rises to
Adsorptive pressure, two sections of adsorption towers just complete complete " adsorption-regeneration " circulation, and have carried out standard to adsorb next time
It is standby.
5. the method that a kind of ethylene, propylene device exhaust as claimed in claim 1 is reclaimed, it is characterised in that described vavuum pump
(2-2) and the second vavuum pump (2-3) also share an appendage vacuum pump.
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Address after: No. 555, Ring Bridge Road, Pudong New Area, Shanghai, Shanghai Applicant after: Shanghai Hanxing Chemical Technology Co.,Ltd. Address before: No. 555, Ring Bridge Road, Pudong New Area, Shanghai, Shanghai Applicant before: SHANGHAI HUAXI CHEMICAL INDUSTRY SCIENCE & TECHNOLOGY CO.,LTD. |
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Application publication date: 20170524 |