CN105056697A - Device and method for recycling low-concentration multicomponent low-pressure refined tail gas - Google Patents
Device and method for recycling low-concentration multicomponent low-pressure refined tail gas Download PDFInfo
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Abstract
The invention discloses a device for recycling low-concentration multicomponent low-pressure refined tail gas. The device comprises a fan, a first vacuum pump, a second vacuum pump and an adsorption device, wherein the adsorption device comprises a first-stage adsorption device and a second-stage adsorption device, the fan is connected with the first-stage adsorption device, a first program-controlled valve is also arranged at the outlet end of the first-stage adsorption device, and the first-stage adsorption device is connected with the second-stage adsorption device; the outlet end of the second-stage adsorption device is connected with the inlet end of the first-stage adsorption device, a second program-controlled valve is arranged between the outlet end of the second-stage adsorption device and the inlet end of the first-stage adsorption device, the second-stage adsorption device is connected to a main body device, and a third program-controlled valve is arranged between the second-stage adsorption device and the second vacuum pump. The invention further discloses a method for recycling the low-concentration multicomponent low-pressure refined tail gas. The device is simple in structure, treated purified gas can return a system or reach a discharging standard, and recovered hydrocarbon components can be reused as chemical raw materials, so that pollution on atmosphere is reduced, the cost is reduced, and resources are saved.
Description
Technical field
The present invention relates to a kind of recovery tail gas unit, being specifically related to a kind of devices and methods therefor for reclaiming low concentration, multicomponent, low pressure refinery tail gas, belong to gas recycling technical field.
Background technology
Can produce a large amount of containing low concentration hydro carbons (CxHy) tail gas in Refining Chemical Industry production process, its hydrocarbon component mainly contains ethene, propylene etc., and Balance Air is nitrogen.The current conventional treatment method of such tail gas enters torch burning, or drain into air after simple adsorption treatment, its hydro carbons concentration does not reach the requirement of discharge standard far away, consequent VOCs(volatile organic matter) pollute, not only there are denseer stink, excitant and toxicity, and easily form organic fine particle in an atmosphere, and be the presoma of PM2.5, one of reason causing haze.
The emphasis of China's waste gas pollution control and treatment for a long time has mainly been placed in dedusting, desulfurization and denitration work, and the control macro-progress of organic exhaust gas is slow.The domestic many employings of enterprise being engaged in VOCs treatment are at present that one section of High Pressure Absorption treatment process of adsorbent carries out tail gas recycle with active carbon, its actual operational effect shows, adsorbent reactivation efficiency is low, low and the concentration of hydrocarbon component organic efficiency is low is difficult to recycling, and in discharge gas, the concentration of NMHC is difficult to reach environmental protection standard requirement.And mainly adopt the recovery processing technique of compression condensation+pressure-variable adsorption first by tail gas compression, then by multi-stage condensing, reclaim the organic efficiency that almost can reach 100% finally by pressure-variable adsorption abroad.But this kind of technique has its limitation, mainly has the following disadvantages: be first that compressibility and the high and power consumption of Cryogenic condensation system investment are large, package unit operating cost is higher; Next is that the dust processed in gas can have a strong impact on compressor and whole system safety and stability.
Summary of the invention
Technical problem to be solved by this invention is, overcome the shortcoming of prior art, provide a kind of devices and methods therefor reclaiming low concentration, multicomponent, low pressure refinery tail gas, this apparatus structure is simple, method of operating is simple, purified gas after process can retrieval system or qualified discharge, and the hydrocarbon component of recovery can recycle as industrial chemicals, high efficiente callback, reduce the pollution to air, make utilization of resources, reduce costs, economize on resources.
In order to solve above technical problem, the invention provides a kind of device reclaiming low concentration, multicomponent, low pressure refinery tail gas, comprise blower fan, the first vavuum pump, the second vavuum pump and adsorbent equipment, blower fan is arranged on the entrance point of adsorbent equipment, recovery low concentration, multicomponent, low pressure refinery tail gas enter in adsorbent equipment through blower fan, by the second vavuum pump, the tail gas through adsorbent equipment is delivered to agent set again, wherein:
Adsorbent equipment comprises the one section of adsorbent equipment and two sections of adsorbent equipments that are arranged side by side, and the adsorption tower that one section of adsorbent equipment and two sections of adsorbent equipments are arranged side by side by least six respectively forms, blower and pipeline connects one section of adsorbent equipment, the port of export of one section of adsorbent equipment is also provided with the first process control valve, one section of adsorbent equipment connects two sections of adsorbent equipments by the first vavuum pump, the port of export of two sections of adsorbent equipments connects the entrance point of one section of adsorbent equipment by pipeline, the pipeline of the two sections of adsorbent equipment port of export to section adsorbent equipment entrance points is provided with the second process control valve, two sections of adsorbent equipments are connected to agent set by the second vavuum pump, the 3rd process control valve is provided with between two sections of adsorbent equipments and the second vavuum pump.
The technical scheme that the present invention limits further is:
Further, aforementioned recovery low concentration, multicomponent, in the device of low pressure refinery tail gas, the adsorption tower that one section of adsorbent equipment and two sections of adsorbent equipments are arranged side by side by six respectively forms, placed in series is passed through between six adsorption towers in one section of adsorbent equipment and two sections of adsorbent equipments, and the pipeline of series connection is equipped with stop valve, adsorption tower in one section of adsorbent equipment and two sections of adsorbent equipments is followed successively by one section of first adsorption tower respectively, one section of second adsorption tower, one section of the 3rd adsorption tower, one section of the 4th adsorption tower, one section of the 5th adsorption tower, one section of the 6th adsorption tower, two section of first adsorption tower, two section of second adsorption tower, two section of the 3rd adsorption tower, two section of the 4th adsorption tower, two section of the 5th adsorption tower and two section of the 6th adsorption tower,
Low concentration, multicomponent, low pressure refinery tail gas enters in one section of first adsorption tower by blower fan, the port of export of one section of first adsorption tower arranges the first process control valve, the port of export of one section of the 6th adsorption tower connects the entrance point of two section of first adsorption tower by the first vavuum pump, the port of export of two section of first adsorption tower connects the entrance point of one section of first adsorption tower by pipeline, and the pipeline of two section of first adsorption column outlet end to section the first adsorption tower entrance point is provided with the second process control valve, the port of export of two section of the 6th adsorption tower connects agent set by the second vavuum pump, and be provided with the 3rd process control valve between two section of the 6th adsorption column outlet end and the second vavuum pump.
In the device of aforementioned recovery low concentration, multicomponent, low pressure refinery tail gas, in one section of adsorbent equipment and two sections of adsorbent equipments, every section all has six towers or more and is in different job steps separately and replaces switchover operation, all the time a tower absorption is had, the equal voltage rise step-down of two towers, two towers vacuumize complementary balanced desorb, a tower gas product displacement.
In the device of aforementioned recovery low concentration, multicomponent, low pressure refinery tail gas, first process control valve, the second process control valve and the 3rd process control valve arrangement are identical, all adopt balance cylinder structure, traditional yi word pattern flap type is transformed into U-shaped, and be placed in inner sleeve and be tightly connected, the upper and lower conducting of bottom opening.
The present invention have also been devised a kind of method reclaiming low concentration, multicomponent, low pressure refinery tail gas, comprises the following steps:
(1) before passing into low concentration, multicomponent, low pressure refinery tail gas, the first sequencing valve, the second sequencing valve and the 3rd sequencing valve are all in closed condition, stop valve simultaneously in one section of adsorbent equipment and two sections of adsorbent equipments is also all in closed condition, low concentration, multicomponent, low pressure refinery tail gas enter bottom one section of first adsorption tower through blower fan, purify with the adsorbent contact in one section of first adsorption tower, in rear gas to be clean during NMHC volumetric concentration < 1%, gas qualified discharge after the first process control valve will purify;
(2) after one section of first absorption tower adsorbs completes, open the stop valve in one section of adsorbent equipment and two sections of adsorbent equipments between adsorption tower, one section of second, third adsorption tower carries out step-down, desorb is not carried out by the hydrocarbon gas component of adsorbing by one section of first adsorption tower, one section the 4th simultaneously, the 5th adsorption tower carries out vacuumizing further desorb and keeping equilibrium desorption, one section of the 6th adsorption tower carries out the gas displacement of product;
(3) hydrocarbon gas after one section of the 6th adsorption tower causes two sections of adsorbent equipments by the first vavuum pump, first carry out further adsorption cleaning through two section of first adsorption tower, then through the second process control valve of two section of first adsorption column outlet end, purified gas is caused import department's circular treatment of one section of first adsorption tower, two section second, 3rd adsorption tower carries out step-down, desorb is not carried out by the hydrocarbon gas component of adsorbing by two section of first adsorption tower, two section the 4th simultaneously, 5th adsorption tower carries out vacuumizing further desorb and keeping equilibrium desorption, two section of the 6th adsorption tower carries out the gas displacement of product,
(4) hydrocarbon gas after two section of the 6th adsorption tower gas displacement controls to cause agent set by the second vavuum pump by the 3rd process control valve and carries out recycling, completes the recycling of low concentration, multicomponent, low pressure refinery tail gas.
The technical scheme that the present invention limits further is:
Further, in aforementioned recovery low concentration, multicomponent, low pressure refinery tail gas method, reclaim hydrocarbon component volumetric concentration in low concentration, multicomponent, low pressure refinery tail gas and be not less than 13%, hydrocarbon gas volumetric concentration after one section of the 6th adsorption tower maintains 50-60%, and the hydrocarbon gas volumetric concentration after two section of the 6th adsorption tower is greater than 92%.
In aforementioned recovery low concentration, multicomponent, low pressure refinery tail gas method, adsorbent is high-performance sial/molecular sieve compound-type adsorbent, and adsorptive pressure can be low to moderate 10 ~ 20KPa.G, and desorption pressures is-70 ~-80KPa.G.
Technique effect, the high-performance used in the present invention sial/molecular sieve compound-type adsorbent, its adsorptive pressure can be low to moderate 10-20KPa.G, desorption pressures is 70-80KPa.G, sorption and desorption is easier, absorption selective higher, long service life (estimating to reach more than 6 years), adsorbance is large, desorption and regeneration is easy, improves overall organic efficiency, ensures that work quality is high, considerably reduce operation energy consumption and disposal of pollutants, improve product purity and the stability of a system.
The invention has the beneficial effects as follows:
The present invention adopts two sections of multitower low pressure adsorbent techniques, realize that process tail gas hydro carbons volumetric concentration is minimum 13%, hydrocarbon component rate of recovery >96%, gas product concentration >92%, discharge gas NMHC volumetric concentration <1%, when not affecting the operation of agent set, energy consumption and operating cost all can reduce by more than 30%.
The process control valve used in the present invention, when valve closing, the pressure born is low end pressure, the sealing force that the just driving head that sealing surface bears provides; Meanwhile, when media flow, High Pressure can not be produced on valve sealing face, realize keying speed and be less than 2 seconds, make control more accurate, effectively ensure that the stable operation of system; Spool and filler adopt unique construction and material in addition, increase substantially the performance such as valve antiscour, zero leakage, are greater than service life 1,000,000 times, and sealing grade reaches ANSI six grades.
Automatic Control software is operationally adopted in the present invention, adopt the control software design bag being adapted to two sections of multi-tower variable pressure adsorption techniques, can realize automatically cutting tower and the function such as recovery operation, pressure-variable adsorption pressure adaptive regulate, device parameter Automatic Optimal, security of system are chain, the equal controllable adjustment of key parameter, automatic decision absorption terminal, realizes hydro carbons tail gas recycling and treating device " unattended " substantially.
The device of recovery low concentration of the present invention, multicomponent, low pressure refinery tail gas can make the hydrocarbon gas rate of recovery in tail gas reach more than 96%, high efficiente callback, reduces the pollution to air, makes utilization of resources, reduce costs, economize on resources.
Accompanying drawing explanation
Fig. 1 is the flow chart that the present invention reclaims low concentration, multicomponent, low pressure refinery tail gas;
Fig. 2 is the present invention reclaims low concentration, multicomponent, low pressure refinery tail gas flow chart when one section, two sections adsorbent equipments are six adsorption towers;
Fig. 3 is high-performance sial/molecular sieve compound-type adsorbent adsorption curve figure at different temperatures in the present invention;
Fig. 4 is high-performance sial/molecular sieve compound-type adsorbent adsorption curve figure at various pressures in the present invention;
In figure: 1-blower fan, 2-first vavuum pump, 3-second vavuum pump, 4-mono-section of adsorbent equipment, 41-mono-section of first adsorption tower, 42-mono-section of second adsorption tower, 43-mono-section of the 3rd adsorption tower, 44-mono-section of the 4th adsorption tower, 45-mono-section of the 5th adsorption tower, 46-mono-section of the 6th adsorption tower, 5-bis-sections of adsorbent equipments, 51-bis-section of first adsorption tower, 52-bis-section of second adsorption tower, 53-bis-section of the 3rd adsorption tower, 54-bis-section of the 4th adsorption tower, 55-bis-section of the 5th adsorption tower, 56-bis-section of the 6th adsorption tower, 6-first process control valve, 7-second process control valve, 8-the 3rd process control valve, 9-agent set.
Detailed description of the invention
1-4 is described in further detail embodiment by reference to the accompanying drawings
embodiment 1
Structure as shown in Figure 1, a kind of device reclaiming low concentration, multicomponent, low pressure refinery tail gas that the present embodiment provides, comprise blower fan 1, first vavuum pump 2, second vavuum pump 3 and adsorbent equipment, blower fan 1 is arranged on the entrance point of adsorbent equipment, recovery low concentration, multicomponent, low pressure refinery tail gas enter in adsorbent equipment through blower fan 1, by the second vavuum pump 3, the tail gas through adsorbent equipment is delivered to agent set again, wherein:
Adsorbent equipment comprises the one section of adsorbent equipment 4 and two sections of adsorbent equipments 5 that are arranged side by side, and all have six towers or more and be in different job steps separately in one section of adsorbent equipment 4 and two sections of adsorbent equipments 5 and replace switchover operation, all the time a tower absorption is had, the equal voltage rise step-down of two towers, two towers vacuumize complementary balanced desorb, one tower gas product displacement, blower fan 1 connects one section of adsorbent equipment 4 by pipeline, the port of export of one section of adsorbent equipment 4 is also provided with the first process control valve 6, first process control valve 6 enters air by pipeline, one section of adsorbent equipment 4 connects two sections of adsorbent equipments 5 by the first vavuum pump 2, the port of export of two sections of adsorbent equipments 5 connects the entrance point of one section of adsorbent equipment 4 by pipeline, the pipeline of two sections of adsorbent equipment 5 port of export to section adsorbent equipment 4 entrance points is provided with the second process control valve 7, two sections of adsorbent equipments 5 are connected to agent set 9 by the second vavuum pump 3, the 3rd process control valve 8 is provided with between two sections of adsorbent equipments 5 and the second vavuum pump 3.
When the adsorption tower be arranged side by side by six respectively when one section of adsorbent equipment 4 and two sections of adsorbent equipments 5 as shown in Figure 2 forms, placed in series is passed through between six adsorption towers in one section of adsorbent equipment 4 and two sections of adsorbent equipments 5, and the pipeline of series connection is equipped with stop valve, adsorption tower in one section of adsorbent equipment 4 and two sections of adsorbent equipments 5 is followed successively by one section of first adsorption tower 41 respectively, one section of second adsorption tower 42, one section of the 3rd adsorption tower 43, one section of the 4th adsorption tower 44, one section of the 5th adsorption tower 45, one section of the 6th adsorption tower 46, two section of first adsorption tower 51, two section of second adsorption tower 52, two section of the 3rd adsorption tower 53, two section of the 4th adsorption tower 54, two section of the 5th adsorption tower 55 and two section of the 6th adsorption tower 56,
Low concentration, multicomponent, low pressure refinery tail gas enters in one section of first adsorption tower 41 by blower fan 1, the port of export of one section of first adsorption tower 41 arranges the first process control valve 6, the port of export of one section of the 6th adsorption tower 46 connects the entrance point of two section of first adsorption tower 51 by the first vavuum pump 2, the port of export of two section of first adsorption tower 51 connects the entrance point of one section of first adsorption tower 41 by pipeline, and the pipeline of two section of first adsorption tower 51 port of export to section the first adsorption tower 41 entrance point is provided with the second process control valve 7, the port of export of two section of the 6th adsorption tower 56 connects agent set 9 by the second vavuum pump 3, and be provided with the 3rd process control valve 8 between two section of the 6th adsorption tower 56 port of export and the second vavuum pump 3.
In the present embodiment, the first process control valve 6, second process control valve 7 and the 3rd process control valve 8 structure identical, all adopt balance cylinder structure, traditional yi word pattern flap type be transformed into U-shaped, and be placed in inner sleeve and be tightly connected, the upper and lower conducting of bottom opening.
embodiment 2
The present embodiment provides a kind of method reclaiming low concentration, multicomponent, low pressure refinery tail gas, comprises the following steps:
(1) low concentration that hydrocarbon component void fraction is not less than 13% is passed into, multicomponent, first sequencing valve 6 before low pressure refinery tail gas, second sequencing valve 7 and the 3rd sequencing valve 8 are all in closed condition, stop valve simultaneously in one section of adsorbent equipment 4 and two sections of adsorbent equipments 5 is also all in closed condition, low concentration, multicomponent, low pressure refinery tail gas enters bottom one section of first adsorption tower 41 through blower fan 1, purify with the adsorbent contact in one section of first adsorption tower 41, in rear gas to be clean during NMHC volumetric concentration < 1%, gas qualified discharge after first process control valve 6 will purify,
(2) one section of first adsorption tower inhale 41 attached complete after open stop valve in one section of adsorbent equipment 4 and two sections of adsorbent equipments 5 between adsorption tower, one section of second, third adsorption tower 42,43 carries out step-down, desorb is not carried out by the hydrocarbon gas component of adsorbing by one section of first adsorption tower 41, one section the 4th simultaneously, the 5th adsorption tower 44,45 carries out vacuumizing further desorb and keeping equilibrium desorption, one section of the 6th adsorption tower 46 carries out the gas displacement of product;
(3) the hydrocarbon gas volumetric concentration after one section of the 6th adsorption tower 46 maintains 50-60% and then causes two sections of adsorbent equipments 5 by the first vavuum pump 2, first carry out further adsorption cleaning through two section of first adsorption tower 51, then through the second process control valve 7 of two section of first adsorption tower 51 port of export, purified gas is caused import department's circular treatment of one section of first adsorption tower 41, two section second, 3rd adsorption tower 52, 53 carry out step-down, desorb is not carried out by the hydrocarbon gas component of adsorbing by two section of first adsorption tower 51, two section the 4th simultaneously, 5th adsorption tower 54, 55 carry out vacuumizing further desorb and keeping equilibrium desorption, two section of the 6th adsorption tower 56 carries out the gas displacement of product,
(4) the hydrocarbon gas volumetric concentration after the displacement of two section of the 6th adsorption tower 56 gas is greater than 92% and then controls to cause agent set 9 by the second vavuum pump 3 by the 3rd process control valve 8 and carry out recycling, completes the recycling of low concentration, multicomponent, low pressure refinery tail gas.
High-performance sial/molecular sieve the compound-type adsorbent used in the present invention, its adsorptive pressure can be low to moderate 10-20KPa.G, and desorption pressures is 70-80KPa.G, and sorption and desorption more easily as shown in Figures 3 and 4, what adsorb is selective higher, long service life (estimating to reach more than 6 years), adsorbance is large, and desorption and regeneration is easy, improve overall organic efficiency, guarantee work quality is high, considerably reduces operation energy consumption and disposal of pollutants, improves product purity and the stability of a system.
In addition to the implementation, the present invention can also have other embodiments.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of application claims.
Claims (7)
1. one kind is reclaimed the device of low concentration, multicomponent, low pressure refinery tail gas, it is characterized in that: comprise blower fan (1), the first vavuum pump (2), the second vavuum pump (3) and adsorbent equipment, described blower fan (1) is arranged on the entrance point of described adsorbent equipment, recovery low concentration, multicomponent, low pressure refinery tail gas enter in adsorbent equipment through blower fan (1), by the second vavuum pump (3), the tail gas through adsorbent equipment is delivered to agent set again, wherein:
Described adsorbent equipment comprises the one section of adsorbent equipment (4) and two sections of adsorbent equipments (5) that are arranged side by side, and the adsorption tower that described one section of adsorbent equipment (4) and two sections of adsorbent equipments (5) are arranged side by side by least six respectively forms, described blower fan (1) connects one section of adsorbent equipment (4) by pipeline, the port of export of described one section of adsorbent equipment (4) is also provided with the first process control valve (6), described one section of adsorbent equipment (4) connects two sections of adsorbent equipments (5) by described the first vavuum pump (2), the port of export of described two sections of adsorbent equipments (5) connects the entrance point of one section of adsorbent equipment (4) by pipeline, the pipeline of two sections of adsorbent equipment (5) port of export to section adsorbent equipment (4) entrance points is provided with the second process control valve (7), described two sections of adsorbent equipments (5) are connected to agent set (9) by described second vavuum pump (3), the 3rd process control valve (8) is provided with between described two sections of adsorbent equipments (5) and the second vavuum pump (3).
2. recovery low concentration according to claim 1, multicomponent, the device of low pressure refinery tail gas, it is characterized in that: the adsorption tower that one section of described adsorbent equipment (4) and two sections of adsorbent equipments (5) are arranged side by side by six respectively forms, placed in series is passed through between six adsorption towers in described one section of adsorbent equipment (4) and two sections of adsorbent equipments (5), and the pipeline of series connection is equipped with stop valve, adsorption tower in described one section of adsorbent equipment (4) and two sections of adsorbent equipments (5) is followed successively by one section of first adsorption tower (41) respectively, one section of second adsorption tower (42), one section of the 3rd adsorption tower (43), one section of the 4th adsorption tower (44), one section of the 5th adsorption tower (45), one section of the 6th adsorption tower (46), two section of first adsorption tower (51), two section of second adsorption tower (52), two section of the 3rd adsorption tower (53), two section of the 4th adsorption tower (54), two section of the 5th adsorption tower (55) and two section of the 6th adsorption tower (56),
Low concentration, multicomponent, low pressure refinery tail gas enters in one section of first adsorption tower (41) by described blower fan (1), the port of export of described one section of first adsorption tower (41) arranges the first described process control valve (6), the port of export of described one section of the 6th adsorption tower (46) connects the entrance point of two section of first adsorption tower (51) by described the first vavuum pump (2), the port of export of described two section of first adsorption tower (51) connects the entrance point of one section of first adsorption tower (41) by pipeline, and the pipeline of two section of first adsorption tower (51) port of export to section the first adsorption tower (41) entrance point is provided with the second process control valve (7), the port of export of described two section of the 6th adsorption tower (56) connects agent set (9) by the second vavuum pump (3), and be provided with the 3rd process control valve (8) between two section of the 6th adsorption tower (56) port of export and the second vavuum pump (3).
3. the device of recovery low concentration according to claim 1, multicomponent, low pressure refinery tail gas, it is characterized in that: in described one section of adsorbent equipment (4) and two sections of adsorbent equipments (5), every section all has six towers or more and is in different job steps separately and replaces switchover operation, all the time a tower absorption is had, the equal voltage rise step-down of two towers, two towers vacuumize complementary balanced desorb, a tower gas product displacement.
4. the device of recovery low concentration according to claim 1, multicomponent, low pressure refinery tail gas, it is characterized in that: the first described process control valve (6), the second process control valve (7) and the 3rd process control valve (8) structure are identical, all adopt balance cylinder structure, flap type is U-shaped, and be placed in inner sleeve and be tightly connected, the upper and lower conducting of bottom opening.
5. reclaim a method for low concentration, multicomponent, low pressure refinery tail gas, it is characterized in that, comprise the following steps:
(1) low concentration is passed into, multicomponent, first sequencing valve (6) before low pressure refinery tail gas, second sequencing valve (7) and the 3rd sequencing valve (8) are all in closed condition, stop valve simultaneously in one section of adsorbent equipment (4) and two sections of adsorbent equipments (5) is also all in closed condition, low concentration, multicomponent, low pressure refinery tail gas enters one section of first adsorption tower (41) bottom through blower fan (1), purify with the adsorbent contact in one section of first adsorption tower (41), in rear gas to be clean during NMHC volumetric concentration < 1%, gas qualified discharge after first process control valve (6) will purify,
(2) after one section of first adsorption tower is inhaled that (41) are attached and completed, open the stop valve in one section of adsorbent equipment (4) and two sections of adsorbent equipments (5) between adsorption towers, one section of second, third adsorption tower (42,43) carries out step-down, desorb is not carried out by the hydrocarbon gas component of adsorbing by one section of first adsorption tower (41), one section the 4th simultaneously, the 5th adsorption tower (44,45) carries out vacuumizing further desorb and keeping equilibrium desorption, one section of the 6th adsorption tower (46) carries out the gas displacement of product;
(3) hydrocarbon gas after one section of the 6th adsorption tower (46) causes two sections of adsorbent equipments (5) by the first vavuum pump (2), first carry out further adsorption cleaning through two section of first adsorption tower (51), then through the second process control valve (7) of two section of first adsorption tower (51) port of export, purified gas is caused import department's circular treatment of one section of first adsorption tower (41), two section second, 3rd adsorption tower (52, 53) step-down is carried out, desorb is not carried out by the hydrocarbon gas component of adsorbing by two section of first adsorption tower (51), two section the 4th simultaneously, 5th adsorption tower (54, 55) carry out vacuumizing further desorb and keeping equilibrium desorption, two section of the 6th adsorption tower (56) carries out the gas displacement of product,
(4) hydrocarbon gas after two section of the 6th adsorption tower (56) gas displacement controls to cause agent set (9) by the second vavuum pump (3) by the 3rd process control valve (8) and carries out recycling, completes the recycling of low concentration, multicomponent, low pressure refinery tail gas.
6. recovery low concentration according to claim 5, multicomponent, low pressure refinery tail gas method, it is characterized in that: in described recovery low concentration, multicomponent, low pressure refinery tail gas, hydrocarbon component volumetric concentration is not less than 13%, hydrocarbon gas volumetric concentration after one section of the 6th adsorption tower (46) maintains 50-60%, and the hydrocarbon gas volumetric concentration after two section of the 6th adsorption tower (56) is greater than 92%.
7. recovery low concentration according to claim 5, multicomponent, low pressure refinery tail gas method, is characterized in that: adsorbent adopts high-performance sial/molecular sieve compound-type adsorbent, and adsorptive pressure can be low to moderate 10 ~ 20KPa.G, and desorption pressures is-70 ~-80KPa.G.
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