CN105233624A - Organic gas processing device based on adsorption under pressure and using method thereof - Google Patents

Organic gas processing device based on adsorption under pressure and using method thereof Download PDF

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Publication number
CN105233624A
CN105233624A CN201510686291.9A CN201510686291A CN105233624A CN 105233624 A CN105233624 A CN 105233624A CN 201510686291 A CN201510686291 A CN 201510686291A CN 105233624 A CN105233624 A CN 105233624A
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absorption tower
valve
pressure
absorption
tower
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CN105233624B (en
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赵雯晴
许光
周日峰
张健中
张卫华
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China Petroleum and Chemical Corp
Sinopec Qingdao Safety Engineering Institute
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China Petroleum and Chemical Corp
Sinopec Qingdao Safety Engineering Institute
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Abstract

The invention relates to an organic gas processing device based on adsorption under pressure and a using method thereof. The processing device comprises absorption towers, and at least two program control valves are installed at the positions of inlets and outlets of the absorption towers. The program control valves at the positions of the outlets of the absorption towers comprise an absorption tower outlet valve, an absorption tower final pressure rise valve, an absorption tower concurrent discharge pressure reduction valve and an inter-tower pressure equalizing rise valve. The program control valves at the positions of the inlets of the absorption towers comprise an absorption tower bottom inlet valve, an absorption tower vacuumizing valve and an absorption tower emptying valve. A vacuum pump, a first buffer tank, a compressor, a shell-and-tube heat exchanger, an oil-water separator and a second buffer tank are connected in sequence. The second buffer tank is connected with a regulating valve, and the oil-water separator is connected with a valve. The number of the absorption towers is at least three. The absorption towers comprise an absorption tower in an adsorption state, an absorption tower in a vacuumizing state and an absorption tower in an adsorption finished state. The organic gas processing device can perform efficient recycling treatment on organic gas and is simple and rational in structure, convenient to use and low in cost.

Description

A kind of organic gas treating apparatus based on absorption with pressure and using method thereof
Technical field
The invention belongs to organic gas processing technology field, relate to a kind of organic gas treating apparatus based on absorption with pressure and using method thereof.
Background technology
At present, in organic gas processing technology field, when temperature-resistant, adsorbing when pressurizeing, by decompression (vacuumizing) or the method for normal pressure desorb, being called pressure-variable adsorption.The adsorbance of adsorbent to adsorbate increases along with the rising of pressure, and reduces along with the reduction of pressure, releases by the gas adsorbed simultaneously, make adsorbent reactivation in decompression process, and extraneous needs supplies the regeneration that heat just can carry out adsorbent.Pressure-variable adsorption has following features because of it, and (1) product purity of being used widely in the industry is high; (2) need not heat during bed regeneration, energy saving economy; (3) equipment is simple, operation, easy to maintenance.Pressure swing adsorption is mainly used in the separation of oxygen nitrogen, air oxygen detrition and the field such as purification and hydrogen cleaning at present, but along with the improvement of molecular sieve performance and the raising of quality, needs badly and pressure swing adsorption is applied to other field, obtains larger economic benefit.Publication number be CN101862574A patent discloses a kind of vacuum pressure swing adsorption system, comprise six absorption towers, two groups of independently air blast and three groups independently vavuum pumps, although it can realize fairly large oxygen, but there is equipment complexity, the shortcoming that cost of investment is larger.For this reason, need a kind of organic gas treating apparatus based on absorption with pressure and using method thereof, solve high pressure exhaust gas not easily by the technical problem of adsorption treatment, overcome equipment complexity, the defect that cost of investment is larger, can carry out high efficiente callback process to organic gas, and device structure advantages of simple, easy to use, cost is less.
Summary of the invention
The object of the present invention is to provide a kind of organic gas treating apparatus based on absorption with pressure and using method thereof, solve high pressure exhaust gas not easily by the technical problem of adsorption treatment, overcome equipment complexity, the defect that cost of investment is larger, high efficiente callback process can be carried out to organic gas, and device structure advantages of simple, easy to use, cost is less.
A kind of organic gas treating apparatus based on absorption with pressure of the present invention, comprise absorption tower, at least two program-controlled valves are equipped with in the import department on absorption tower and exit; The program-controlled valve in the exit on absorption tower comprises absorption tower top exit valve, valve is finally boosted on absorption tower, absorption tower is suitable puts equal voltage rise valve between step-down valve and tower, and the program-controlled valve of the import department on absorption tower comprises absorption tower bottom inlet valve, absorption tower vacuum-pumping valve and absorption tower emptying valve; Vavuum pump, the first surge tank, compressor, tubular heat exchanger, oil water separator are connected successively with the second surge tank, the second surge tank is connected with control valve, oil water separator is connected with valve; The quantity on absorption tower is at least three, comprises respectively being in adsorbed state absorption tower, being in and vacuumizing state absorption tower and complete adsorbed state absorption tower.
In above scheme preferably, the organic gas treating apparatus based on absorption with pressure is also connected with electric-control system with temperature reducing and pressure reducing system, pneumatic system respectively.
Preferably, metal carbon core in absorption tower, can also be provided with.
Can also preferably, the outer wrap of metal carbon core has NACF.
Can also preferably, the quantity on absorption tower is eight, comprising four be in adsorbed state absorption tower, one be in vacuumize state absorption tower, one complete adsorbed state absorption tower and Liang Tai is in buck or boost state absorption tower.
The present invention also provides a kind of using method of the organic gas treating apparatus based on absorption with pressure, comprise the following steps: the first step, adsorption process, open absorption tower bottom inlet valve, absorption tower top exit valve, the organic gas of discharge enters and is in adsorbed state absorption tower after the process of filter gas washing at the bottom of tower, active principle is got off by adsorbent, is not flowed out from tower top by the gas etc. adsorbed, and discharges after the second surge tank voltage stabilizing, after absorption terminates, close the absorption tower top exit valve on this absorption tower, second step, along putting pressure reduction, the pressure completed in adsorbed state absorption tower equals adsorptive pressure, the hydrocarbon content of working off one's feeling vent one's spleen is low, open absorption tower along putting step-down valve, control valve, tower group along putting step-down valve, carrying out step-down process to completing adsorbed state absorption tower, discharging certain excess pressure, improve the concentration of hydrocarbon, after completing, close control valve, tower group along putting step-down valve, 3rd step, equal pressure drop and equal voltage rise process between absorption tower, complete adsorbed state absorption tower along after putting step-down, complete in adsorbed state absorption tower and also have gases at high pressure, continue along being put into out-of-bounds, hydro carbons can be taken out of, reduce gas recovery ratio, open equal voltage rise valve between tower, gases at high pressure after suitable putting are put into be in and vacuumizes state absorption tower, thus improve the concentration of hydrocarbon in adsorbed state absorption tower, the hydro carbons having taken adsorbed state absorption tower with step-down gas out of vacuumizes in state absorption tower by continuation absorption being in, after completing, closedown absorption tower is along putting equal voltage rise valve between step-down valve and tower, 4th step, emptying process, after between absorption tower, equal pressure drop completes, complete in adsorbed state absorption tower the gas also had higher than normal pressure, open absorption tower emptying valve, the reverse discharge of gas and take some hydrocarbon out of, pressure is dropped to normal pressure, emptying gas enters the first surge tank through control valve, reclaims finally by tubular heat exchanger is cooled, 5th step, vacuum, after emptying process terminates, has opened the vacuum-pumping valve that adsorbed state absorption tower is corresponding, has opened vavuum pump, by vacuumizing mode by the desorbing gas that is adsorbed in adsorbent out, delivers to the 6th step, 6th step, final boost process, be in and vacuumize after all boosting terminates of state absorption tower, open absorption tower finally to boost valve and control valve, the absorption tail gas being in adsorbed state absorption tower being introduced to be in vacuumizes in state absorption tower, vacuumizing boost in pressure in state absorption tower to adsorptive pressure by being in lentamente, preparing the absorption in next stage.
In above scheme preferably, also comprise the 7th step, Product recycling process, first the gas mixture of vacuum being released cushions through the first surge tank, then through compressor pressurizes, lowered the temperature by tubular heat exchanger, congeal into hydro carbons and water-cooled liquid, condensed mixture again, collect oil water separator and carry out stratification, removing moisture, opens valve, recycles product.
Can also preferably, by the gas mixture after buffering through compressor pressurizes to 0.5MPa.
Preferably, the gas mixture after pressurization can also be cooled to 25 DEG C by tubular heat exchanger again.
Compared with prior art, the present invention has the following advantages:
The invention provides a kind of organic gas treating apparatus based on absorption with pressure and using method thereof, high pressure exhaust gas can be solved not easily by the technical problem of adsorption treatment, overcome equipment complexity, the defect that cost of investment is larger, its technology adopting pressure-variable adsorption and refrigerated separation to combine, the i.e. process route of NACF absorption with pressure-steam desorb-circulating water condensing, high efficiente callback process can be carried out to organic gas, and device structure advantages of simple, easy to use, cost is less; It, by adopting interval, many absorption towers superposition operational mode, not only ensure that the continuity of processing procedure but also effectively reduces entrance flow velocity, the rational buck technique in absorption tower; It can efficiently process, and capacity is large, pressure is high, hydrocarbon content concentration is low, the organic gas discharge of long-time continuous discharge, and technique is simple, and cost is lower, and continuous circulation operation, reach automation completely.
Accompanying drawing explanation
Fig. 1 is the structural representation of the organic gas treating apparatus based on absorption with pressure of the present invention;
Fig. 2 is the process flow diagram of the organic gas treating apparatus based on absorption with pressure of the present invention.
In figure, 1 is absorption tower, as shown in T1-T8; 2 is filter, as indicated at a; 3 is vavuum pump, as shown in B; 4 is the first surge tank, as shown at c; 5 is compressor, as shown atd; 6 is tubular heat exchanger, as shown in E; 7 is oil water separator, as shown in F; 8 is the second surge tank, as shown in G; 9 is absorption tower top exit valve, as shown in KV102a-KV102h; 10 for finally boosting valve on absorption tower, as shown in KV103a-KV103h; 11 for absorption tower is along putting step-down valve, as shown in KV104a-KV104h; 12 is equal voltage rise valve between tower, as shown in KV105a-KV105h; 13 is absorption tower bottom inlet valve, as shown in KV101a-KV101h; 14 is absorption tower vacuum-pumping valve, as shown in KV106a-KV106h; 15 is absorption tower emptying valve, as shown in KV107a-KV107h; 16 for tower group is along putting step-down valve, as shown in KV108; 17 is control valve, as shown in KC101-103; 18 is valve.
Detailed description of the invention
In order to understand the present invention better, below in conjunction with specific embodiment, the present invention is explained in detail.But, obviously can carry out different modification and remodeling to the present invention and not exceed the wider spirit and scope of the present invention of appended claims.Therefore, following examples have exemplary and hard-core implication.
Embodiment:
Based on an organic gas treating apparatus for absorption with pressure, comprise absorption tower 1, at least two program-controlled valves are equipped with in the import department on absorption tower 1 and exit; The program-controlled valve in the exit on absorption tower 1 comprises absorption tower top exit valve 9, valve 10 is finally boosted on absorption tower, absorption tower is suitable puts equal voltage rise valve 12 between step-down valve 11 and tower, and the program-controlled valve of the import department on absorption tower 1 comprises absorption tower bottom inlet valve 13, absorption tower vacuum-pumping valve 14 and absorption tower emptying valve 15; Vavuum pump 3, first surge tank 4, compressor 5, tubular heat exchanger 6, oil water separator 7 are connected successively with the second surge tank 8, the second surge tank 8 is connected with control valve 17, oil water separator 7 is connected with valve 18; The quantity on absorption tower 1 is at least three, comprises respectively being in adsorbed state absorption tower, being in and vacuumizing state absorption tower and complete adsorbed state absorption tower.
In the above-described embodiments, the organic gas treating apparatus based on absorption with pressure is also connected with electric-control system with temperature reducing and pressure reducing system, pneumatic system respectively.
In the above-described embodiments, metal carbon core is provided with in absorption tower 1.
In the above-described embodiments, the outer wrap of metal carbon core has NACF.
In the above-described embodiments, the quantity on absorption tower 1 is eight, comprising four be in adsorbed state absorption tower, one be in vacuumize state absorption tower, one complete adsorbed state absorption tower and Liang Tai is in buck or boost state absorption tower.
A kind of using method of the organic gas treating apparatus based on absorption with pressure, comprise the following steps: the first step, adsorption process, open absorption tower bottom inlet valve 13, absorption tower top exit valve 9, the organic gas of discharge enters and is in adsorbed state absorption tower after the process of filter 2 gas washing at the bottom of tower, active principle is got off by adsorbent, is not flowed out from tower top by the gas etc. adsorbed, and discharges after the second surge tank 8 voltage stabilizing, after absorption terminates, close the absorption tower top exit valve 9 on this absorption tower, second step, along putting pressure reduction, the pressure completed in adsorbed state absorption tower equals adsorptive pressure, the hydrocarbon content of working off one's feeling vent one's spleen is low, open absorption tower along putting step-down valve 11, control valve 17, tower group along putting step-down valve 16, carrying out step-down process to completing adsorbed state absorption tower, discharging certain excess pressure, improve the concentration of hydrocarbon, after completing, close control valve 17, tower group along putting step-down valve 16, 3rd step, equal pressure drop and equal voltage rise process between absorption tower, complete adsorbed state absorption tower along after putting step-down, complete in adsorbed state absorption tower and also have gases at high pressure, continue along being put into out-of-bounds, hydro carbons can be taken out of, reduce gas recovery ratio, open equal voltage rise valve 12 between tower, gases at high pressure after suitable putting are put into be in and vacuumizes state absorption tower, thus improve the concentration of hydrocarbon in adsorbed state absorption tower, the hydro carbons having taken adsorbed state absorption tower with step-down gas out of vacuumizes in state absorption tower by continuation absorption being in, after completing, closedown absorption tower is along putting equal voltage rise valve 12 between step-down valve 11 and tower, 4th step, emptying process, after between absorption tower 1, equal pressure drop completes, complete in adsorbed state absorption tower the gas also had higher than normal pressure, open absorption tower emptying valve 15, the reverse discharge of gas and take some hydrocarbon out of, pressure is dropped to normal pressure, emptying gas enters the first surge tank 4 through control valve 17, reclaims finally by tubular heat exchanger 6 is cooled, 5th step, vacuum, after emptying process terminates, has opened vacuum-pumping valve corresponding to adsorbed state absorption tower 14, has opened vavuum pump 3, by vacuumizing mode by the desorbing gas that is adsorbed in adsorbent out, delivers to the 6th step, 6th step, final boost process, be in and vacuumize after all boosting terminates of state absorption tower, open absorption tower finally to boost valve 10 and control valve 17, the absorption tail gas being in adsorbed state absorption tower being introduced to be in vacuumizes in state absorption tower, vacuumizing boost in pressure in state absorption tower to adsorptive pressure by being in lentamente, preparing the absorption in next stage.
In the above-described embodiments, also comprise the 7th step, Product recycling process, first the gas mixture of vacuum being released cushions through the first surge tank 4, then pressurize through compressor 5, lowered the temperature by tubular heat exchanger 6, congeal into hydro carbons and water-cooled liquid, condensed mixture again, collect oil water separator 7 and carry out stratification, removing moisture, opens valve 18, recycles product.
In the above-described embodiments, the gas mixture after buffering is forced into 0.5MPa through compressor 5.
In the above-described embodiments, the gas mixture after pressurization is cooled to 25 DEG C by tubular heat exchanger 6 again.
As depicted in figs. 1 and 2, organic gas treating apparatus based on absorption with pressure of the present invention, comprise platform absorption tower 1, i.e. T1-T8, absorption tower 1 is built with metal carbon core, carbon core outer wrapping NACF, the entrance and exit on absorption tower 1 is equipped with multiple program-controlled valve, the absorption with pressure on absorption tower is controlled by the switch of valve, the processes such as steam desorb and discharge air dry, program-controlled valve comprises absorption tower bottom inlet valve 13, absorption tower top exit valve 9, finally boost valve 10 on absorption tower, absorption tower is along putting step-down valve 11, equal voltage rise valve 12 between tower, absorption tower vacuum-pumping valve 14 and absorption tower emptying valve 15.The effect of filter 2 separates the drop and particle carried secretly in the organic gas of discharge.Oil water separator 7 is the equipment oil in condensate liquid, water are separated.Temperature reducing and pressure reducing system Main Function is that the temperature and pressure of stripping vapor is adjusted to suitable process conditions, then introduces in respective absorption tower and carries out steam desorb.Pneumatic system is the executing agency that whole device realizes automatically running, and system passes through signal of telecommunication Controlling solenoid valve, the open and close control cylinder action of magnetic valve, thus realizes the switching of different operating state.The core of electric-control system is the program that PLC, PLC are inserted in advance by operation, sends instruction and carries out work by Control magnetic valve, and can send alarm signal when device breaks down, and automatically takes appropriate measures simultaneously.
In eight absorption towers 1, have four absorption towers to be in adsorbed state, an absorption tower is in the state of vacuumizing simultaneously, and other three absorption towers are in the state of buck or boost respectively.Four absorption towers being in adsorbed state participate in adsorption process by certain time interval overlap, and namely when an absorption tower completes an adsorption cycle, the 5th absorption tower starts to participate in absorption.Setting T2, T3, T4, T5 tetra-absorption towers 1 are for being in adsorbed state absorption tower, and T1 absorption tower 1 is for completing adsorbed state absorption tower, and T6 absorption tower 1 vacuumizes state absorption tower for being in, then:
One, adsorption process: open absorption tower bottom inlet valve 13KV101b-KV101e, absorption tower top exit valve 9KV102b-KV102e, the organic gas of discharge enters and is in adsorbed state absorption tower T2, T3, T4, T5 after the process of filter 2 gas washing at the bottom of tower, active principle is got off by adsorbent, do not flowed out from tower top by the gas etc. adsorbed, discharge after the second surge tank 8 voltage stabilizing.After absorption terminates, close KV101, KV102 program-controlled valve on this absorption tower.
Two, along putting pressure reduction: complete adsorbed state absorption tower T1, in tower, pressure equals adsorptive pressure, the hydrocarbon content of working off one's feeling vent one's spleen is low, open absorption tower along putting step-down valve 11KV104a, control valve 17KC102, tower group along putting step-down valve 16KV108, step-down process is carried out to this absorption tower, discharge certain excess pressure, improve the concentration of hydrocarbon.After completing, close control valve 17KC102, tower group along putting step-down valve 16KV108.
Three, equal pressure drop and equal voltage rise processes between absorption tower: complete adsorbed state absorption tower T1 along after putting step-down, also having gases at high pressure in tower, continuing along being put into out-of-bounds, can hydro carbons be taken out of, reduce gas recovery ratio, if directly put into suction port of compressor, the concentration of hydro carbons can be reduced, strengthen follow-up heat exchange load; And be in vacuumize in the T6 of state absorption tower and be in negative pressure state, can not directly adsorb.So open equal voltage rise valve 12KV105f between tower, gases at high pressure after suitable putting are put into be in and vacuumizes state absorption tower T6, thus improve the concentration of hydrocarbon in the T1 of adsorbed state absorption tower, the hydro carbons having taken adsorbed state absorption tower T1 with step-down gas out of to vacuumize in the T6 of state absorption tower by continuation absorption being in, and improves the rate of recovery of hydro carbons.After completing, closedown absorption tower is along putting equal voltage rise valve 12KV105f between step-down valve 11KV104a, tower.
Four, emptying process: after equal pressure drop completes between absorption tower, complete in the T1 of adsorbed state absorption tower the gas also had higher than normal pressure, open absorption tower emptying valve 15KV107a, the reverse discharge of gas and take some hydrocarbon out of, pressure is dropped to normal pressure, emptying gas enters the first surge tank 4 through control valve 17KC103, reclaims finally by tubular heat exchanger 6 is cooled.
Five, vacuum: after emptying process terminates, has opened the vacuum-pumping valve 14KV106a that adsorbed state absorption tower T1 is corresponding, has opened vavuum pump 3, by vacuumizing mode by the desorbing gas that is adsorbed in adsorbent out, delivers to next link.
Six, final boost process: be in and vacuumize after all boosting terminates of state absorption tower T6, open absorption tower finally to boost valve 10KV103f and control valve 17KC101, the absorption tail gas being in adsorbed state absorption tower T2, T3, T4, T5 being introduced to be in vacuumizes in the T6 of state absorption tower, to be in lentamente and vacuumize boost in pressure in the T6 of state absorption tower and, to adsorptive pressure, wait for the absorption in next stage.
Seven, Product recycling process: first the gas mixture of vacuum being released cushions through the first surge tank 4, then 0.5MPa is forced into through compressor 5, about 25 DEG C are cooled to again by tubular heat exchanger 6, congeal into hydro carbons and water-cooled liquid, condensed mixture, collects oil water separator 7 and carries out stratification, removing moisture, open valve 18, product is recycled.
Organic gas treating apparatus based on absorption with pressure of the present invention, package unit is mainly divided into Adsorption and desorption, dry three links, first NACF is utilized to carry out absorption with pressure to tail gas, adsorb saturated after carry out step-down process, when pressure is lower than steam pressure, steam desorb is carried out to this absorption tower 1, finally condensation separation recovery is carried out to stripping gas.Drying process is carried out on the normal pressure qualified discharge gas utilizing adsorption process the to produce absorption tower 1 complete to desorb, after drying, by absorption discharge gas, ftercompction process is carried out to this absorption tower, make pressure in tower reach adsorptive pressure, be convenient to the adsorption process of next circulation.These three processes hocket, and go round and begin again.
The important technological parameters of this device is as follows:
Organic gas disposal ability: 23000Nm3/h (+10%)
Organic gas discharge quality concentration :≤120mg/m3
Organic gas treatment effeciency: >=98%
Operating pressure: 1.2MPa
Drain time: 24h
Voltage: 380V/220V/50Hz/AC
Power: 10kW
Cooling water: 20 DEG C, 0.2MPa, 20T/hr
Steam: 120 DEG C, 0.2MPa, 2.1T/hr
Floor space: 20m × 10m (long × wide).

Claims (9)

1. based on an organic gas treating apparatus for absorption with pressure, comprise absorption tower (1), it is characterized in that: at least two program-controlled valves are equipped with in import department and the exit of absorption tower (1); The program-controlled valve in the exit on absorption tower (1) comprises absorption tower top exit valve (9), valve (10) is finally boosted on absorption tower, absorption tower is suitable puts equal voltage rise valve (12) between step-down valve (11) and tower, and the program-controlled valve of the import department of absorption tower (1) comprises absorption tower bottom inlet valve (13), absorption tower vacuum-pumping valve (14) and absorption tower emptying valve (15); Vavuum pump (3), the first surge tank (4), compressor (5), tubular heat exchanger (6), oil water separator (7) are connected successively with the second surge tank (8), second surge tank (8) is connected with control valve (17), oil water separator (7) is connected with valve (18); The quantity on absorption tower (1) is at least three, comprises respectively being in adsorbed state absorption tower, being in and vacuumizing state absorption tower and complete adsorbed state absorption tower.
2., as claimed in claim 1 based on the organic gas treating apparatus of absorption with pressure, it is characterized in that: it is also connected with electric-control system with temperature reducing and pressure reducing system, pneumatic system respectively.
3., as claimed in claim 1 based on the organic gas treating apparatus of absorption with pressure, it is characterized in that: in absorption tower (1), be provided with metal carbon core.
4., as claimed in claim 3 based on the organic gas treating apparatus of absorption with pressure, it is characterized in that: the outer wrap of metal carbon core has NACF.
5. as claimed in claim 1 based on the organic gas treating apparatus of absorption with pressure, it is characterized in that: the quantity of absorption tower (1) is eight, comprising four be in adsorbed state absorption tower, one be in vacuumize state absorption tower, one complete adsorbed state absorption tower and Liang Tai is in buck or boost state absorption tower.
6. the using method based on the organic gas treating apparatus of absorption with pressure, comprise the following steps: the first step, adsorption process, open absorption tower bottom inlet valve (13), absorption tower top exit valve (9), the organic gas of discharge enters and is in adsorbed state absorption tower after filter (2) gas washing process at the bottom of tower, active principle is got off by adsorbent, do not flowed out from tower top by the gas etc. adsorbed, discharge after the second surge tank (8) voltage stabilizing, after absorption terminates, close absorption tower top exit valve (9) on this absorption tower, second step, along putting pressure reduction, the pressure completed in adsorbed state absorption tower equals adsorptive pressure, the hydrocarbon content of working off one's feeling vent one's spleen is low, open absorption tower along putting step-down valve (11), control valve (17), tower group along putting step-down valve (16), carrying out step-down process to completing adsorbed state absorption tower, discharging certain excess pressure, improve the concentration of hydrocarbon, after completing, close control valve (17), tower group along putting step-down valve (16), 3rd step, equal pressure drop and equal voltage rise process between absorption tower, complete adsorbed state absorption tower along after putting step-down, complete in adsorbed state absorption tower and also have gases at high pressure, continue along being put into out-of-bounds, hydro carbons can be taken out of, reduce gas recovery ratio, open equal voltage rise valve (12) between tower, gases at high pressure after suitable putting are put into be in and vacuumizes state absorption tower, thus improve the concentration of hydrocarbon in adsorbed state absorption tower, the hydro carbons having taken adsorbed state absorption tower with step-down gas out of vacuumizes in state absorption tower by continuation absorption being in, after completing, closedown absorption tower is along putting equal voltage rise valve (12) between step-down valve (11) and tower, 4th step, emptying process, after between absorption tower (1), equal pressure drop completes, complete in adsorbed state absorption tower the gas also had higher than normal pressure, open absorption tower emptying valve (15), the reverse discharge of gas and take some hydrocarbon out of, pressure is dropped to normal pressure, emptying gas enters the first surge tank (4) through control valve (17), reclaims finally by tubular heat exchanger (6) is cooled, 5th step, vacuum, after emptying process terminates, open vacuum-pumping valve corresponding to adsorbed state absorption tower (14), opening vavuum pump (3), by vacuumizing mode by the desorbing gas that is adsorbed in adsorbent out, delivering to the 6th step, 6th step, final boost process, be in and vacuumize after all boosting terminates of state absorption tower, open absorption tower finally to boost valve (10) and control valve (17), the absorption tail gas being in adsorbed state absorption tower being introduced to be in vacuumizes in state absorption tower, vacuumizing boost in pressure in state absorption tower to adsorptive pressure by being in lentamente, preparing the absorption in next stage.
7. as claimed in claim 6 based on the using method of the organic gas treating apparatus of absorption with pressure, it is characterized in that: also comprise the 7th step, Product recycling process, first the gas mixture of vacuum being released cushions through the first surge tank (4), then pressurize through compressor (5), again by tubular heat exchanger (6) cooling, congeal into hydro carbons and water-cooled liquid, condensed mixture, collect oil water separator (7) and carry out stratification, removing moisture, opens valve (18), recycles product.
8. as claimed in claim 7 based on the using method of the organic gas treating apparatus of absorption with pressure, it is characterized in that: the gas mixture after buffering is forced into 0.5MPa through compressor (5).
9. as claimed in claim 8 based on the using method of the organic gas treating apparatus of absorption with pressure, it is characterized in that: the gas mixture after pressurization is cooled to 25 DEG C by tubular heat exchanger (6) again.
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