Novel combined oil gas recovery system and oil gas recovery method
阅读说明：本技术 一种新型组合式油气回收系统及油气回收方法 (Novel combined oil gas recovery system and oil gas recovery method ) 是由 汪剑辉 陈叶青 薛恒 吕林梅 陈经 赵强 朱新华 于 2020-07-23 设计创作，主要内容包括：一种新型组合式油气回收系统及油气回收方法,所述的油气回收系统包括油气吸附/解吸模块Ⅰ、油气吸附/解吸模块Ⅱ、油气进入管路、解吸气进入管路、解吸油气排出管路、尾气排出管路；所述的油气吸附/解吸模块Ⅰ和油气吸附/解吸模块Ⅱ结构一致,均包括罐体、解吸进口、解吸出口、油气进口和尾气出口；所述的油气进入管路上设置有依次连接的风机、电磁阀和油气浓度仪。该新型组合式油气回收方法采用在罐体侧面均布设置水平相对的解吸进口和解吸出口,使得水平方向的解吸气流均匀分布,保证吸附剂均匀受热,提高解吸效率,油气吸附/解吸模块Ⅰ、油气吸附/解吸模块Ⅱ在控制模块的作用下吸附、解吸工作模式切换进行,实现油气回收连续不停机运行。(A novel combined oil gas recovery system and an oil gas recovery method are disclosed, wherein the oil gas recovery system comprises an oil gas adsorption/desorption module I, an oil gas adsorption/desorption module II, an oil gas inlet pipeline, a desorbed oil gas discharge pipeline and a tail gas discharge pipeline; the oil gas adsorption/desorption module I and the oil gas adsorption/desorption module II have the same structure and respectively comprise a tank body, a desorption inlet, a desorption outlet, an oil gas inlet and a tail gas outlet; the oil gas inlet pipeline is provided with a fan, an electromagnetic valve and an oil gas concentration meter which are connected in sequence. The novel combined type oil gas recovery method is characterized in that desorption inlets and desorption outlets which are horizontally opposite are uniformly distributed on the side face of the tank body, so that desorption air flow in the horizontal direction is uniformly distributed, uniform heating of an adsorbent is guaranteed, desorption efficiency is improved, the oil gas adsorption/desorption module I and the oil gas adsorption/desorption module II are switched between adsorption and desorption working modes under the action of the control module, and continuous non-stop operation of oil gas recovery is realized.)
1. The utility model provides a novel combination formula vapor recovery system, characterized by: the oil gas recovery system comprises an oil gas adsorption/desorption module I, an oil gas adsorption/desorption module II, an oil gas inlet pipeline, a desorbed oil gas discharge pipeline, a tail gas discharge pipeline and a control module; the oil gas adsorption/desorption module I and the oil gas adsorption/desorption module II are consistent in structure and comprise a tank body I (10), a tank body II (11), a desorption inlet I (26), a desorption outlet I (27), a desorption inlet II (28), a desorption outlet II (29), an oil gas inlet I (30), an oil gas inlet II (32), a tail gas outlet I (31) and a tail gas outlet II (33); the desorption inlet I (26) and the desorption outlet I (27) are horizontally arranged on the side surface of the tank body I (10) in an opposite mode and are uniformly distributed; the desorption inlet II (28) and the desorption outlet II (29) are horizontally arranged on the side surface of the tank body II (11) oppositely and uniformly; the oil gas inlet I (30) and the oil gas inlet II (32) are respectively arranged at the bottoms of the tank body I (10) and the tank body II (11); the tail gas outlet I (31) and the tail gas outlet II (33) are respectively arranged at the tops of the tank body I (10) and the tank body II (11); the oil gas inlet pipeline is provided with a fan (16), an electromagnetic valve II (12), an oil gas concentration instrument I (19), an electromagnetic valve IV (14) and an oil gas concentration instrument III (21) which are connected in sequence; the fan (16), the electromagnetic valve II (12) and the oil-gas concentration instrument I (19) are connected with an oil-gas inlet I (30) of the tank body I (10), and the fan (16), the electromagnetic valve IV (14) and the oil-gas concentration instrument III (21) are connected with an oil-gas inlet II (32) of the tank body II (11); the desorption gas inlet pipeline comprises a solenoid valve I (1), a heat exchanger I (2), an electric heater I (6), a temperature sensor I (8), a solenoid valve VI (18), a heat exchanger II (4), an electric heater II (7) and a temperature sensor II (9) which are sequentially connected, and the desorption gas inlet pipeline is respectively connected with a desorption inlet I (26) of the tank body I (10) and a desorption inlet II (28) of the tank body II (11); the desorption oil gas discharge pipeline comprises an electromagnetic valve III (13), an electromagnetic valve V (15), an oil gas concentration instrument V (23) and a vacuum pump (17), wherein the vacuum pump (17) is connected with the oil gas concentration instrument V (23) in series and is respectively connected with a desorption outlet I (27) of the tank body I (10) and a desorption outlet II (29) of the tank body II (11) through the electromagnetic valve III (13) and the electromagnetic valve V (15); the tail gas discharge pipeline consists of a tail gas main pipeline, a tail gas heat exchange pipeline and a tail gas bypass pipeline, the tail gas main pipeline is respectively connected with a tail gas outlet I (31) and a tail gas outlet II (33) of the tank body I (10) and the tank body II (11), the tail gas heat exchange pipeline and the tail gas bypass pipeline are branched from the tail gas main pipeline, and the tail gas heat exchange pipeline is respectively connected with a heat exchanger I (2) and a heat exchanger II (4) of a desorption gas inlet pipeline.
2. The novel combined oil and gas recovery system as set forth in claim 1, wherein: the pot body I (10) and the pot body II (11) are internally provided with an adsorbent and a metal adsorption bed layer (34), the adsorbent is activated carbon, hydrophobic silica gel or a molecular sieve, the metal adsorption bed layer (34) is a metal grating plate, the metal grating plate is respectively connected with the pot body I (10) and the pot body II (11) through welding, and the width of the metal grating is greater than the diameter of the adsorbent.
3. The novel combined oil and gas recovery system as set forth in claim 1, wherein: the fan (16), the electromagnetic valve II (12), the electromagnetic valve IV (14), the oil gas concentration instrument I (19) and the oil gas concentration instrument III (21) on the oil gas inlet pipeline are all electrically connected with the control module; the fan (16) is a Roots blower.
4. The novel combined oil and gas recovery system as set forth in claim 1, wherein: and the solenoid valve I (1), the solenoid valve VI (18), the temperature sensor I (8) and the temperature sensor II (9) on the desorption gas inlet pipeline are all electrically connected with the control module.
5. The novel combined oil and gas recovery system as set forth in claim 1, wherein: the oil gas concentration instrument V (23), the electromagnetic valve III (13) and the electromagnetic valve V (15) on the desorption oil gas discharge pipeline are electrically connected with the control module; the vacuum pump (17) is a screw vacuum pump.
6. The novel combined oil and gas recovery system as set forth in claim 1, wherein: the tail gas main pipeline is provided with an oil gas concentration instrument II (20) and an oil gas concentration instrument IV (22), the tail gas bypass pipeline is provided with a solenoid valve VII (24) and a solenoid valve VIII (25), one ends of the oil gas concentration instrument II (20) and the oil gas concentration instrument IV (22) are respectively connected with a tail gas outlet I (31) and a tail gas outlet II (33) of the tank body I (10) and the tank body II (11), the other ends of the oil gas concentration instrument II (20) and the oil gas concentration instrument IV (22) are respectively connected with the solenoid valve VII (24) and the solenoid valve VIII (25) on the tail gas bypass pipeline, and the solenoid valve VII (24), the solenoid valve VIII (25) and the oil gas concentration instrument II (20) and the oil gas concentration.
7. The novel combined oil and gas recovery system as set forth in claim 1, wherein: the tail gas heat exchange pipeline is provided with a one-way valve I (3) and a one-way valve II (5) which prevent the adsorbed tail gas from flowing into the tank body I (10) and the tank body II (11).
8. The novel combined oil and gas recovery system as set forth in claim 1, wherein: the number of desorption inlets and desorption outlets on the side surfaces of the tank body I (10) and the tank body II (11) is more than two.
9. The novel combined oil and gas recovery system as set forth in claim 1, wherein: the control module is a PLC controller, and is respectively electrically connected with the oil gas inlet pipeline, the desorption gas inlet pipeline and the tail gas discharge pipeline.
10. A method for recovering a novel combined oil and gas recovery system as claimed in any one of claims 1 to 9, characterized in that: the recovery method adopts desorption inlets and desorption outlets which are horizontally opposite and are uniformly distributed on the side surface of the tank body, so that desorption air flow in the horizontal direction is uniformly distributed, uniform heating of an adsorbent is ensured, and the oil gas adsorption/desorption module I and the oil gas adsorption/desorption module II are switched to perform adsorption and desorption working modes under the action of the control module, and the recovery method specifically comprises the following steps:
a. the oil gas adsorption/desorption module I adsorbs oil gas:
oil gas enters an oil gas inlet pipeline under the driving of a fan (16), a control module controls a solenoid valve II (12) and a solenoid valve IV (14) of the oil gas inlet pipeline to enable the oil gas to enter a tank body I (10) of an oil gas adsorption/desorption module I, and the oil gas is adsorbed by the oil gas adsorption/desorption module I;
b. the oil gas adsorption/desorption module I desorbs oil gas, and the oil gas adsorption/desorption module II adsorbs oil gas:
when the control module detects that the concentration difference value of oil gas at the inlet and the outlet of a tank body I (10) of an oil gas adsorption/desorption module I is smaller than a set value C1, the control module controls an electromagnetic valve I (1) of a desorption gas inlet pipeline to enable the desorption gas to enter the tank body I (10) of the oil gas adsorption/desorption module I to be subjected to oil gas desorption, and simultaneously controls an electromagnetic valve IV (14) of an oil gas inlet pipeline to enable the oil gas to enter a tank body II (11) of the oil gas adsorption/desorption module II to be adsorbed by the oil gas adsorption/desorption module II; when the control module detects that the oil gas concentration of a desorption outlet I (27) of the oil gas adsorption/desorption module I is lower than a set value C2, the oil gas adsorption/desorption module I finishes desorption;
c. the working modes of the oil gas adsorption/desorption module I and the oil gas adsorption/desorption module II are switched and circulated:
and the oil gas adsorption/desorption module II performs adsorption-desorption operation under the action of the control module, so that the oil gas adsorption/desorption module I and the oil gas adsorption/desorption module II realize the repeated cycle of oil gas adsorption-desorption.
Technical Field
The invention belongs to the technical field of oil gas recovery, and particularly relates to a novel combined oil gas recovery system and an oil gas recovery method.
Background
With the development of economy and industry, the consumption of fuel oil such as gasoline, diesel oil and the like is continuously and rapidly increased, the volatility of the fuel oil is strong, oil gas is generated inevitably in the processes of loading, unloading and fuel oil using of an oil tank area and a tank truck, chemical smoke is formed by improper oil gas treatment and is discharged into the atmosphere, the safety production is endangered, the environment is polluted, and meanwhile, the discharge of the oil gas must meet the discharge standard regulated by the state, so the oil gas must be recovered. The traditional tank body for oil gas recovery adopts a mode of downward inlet and upward outlet, desorption gas enters a desorption tank from an inlet for desorption, but the desorption effect is poor when vacuum desorption is performed from an opening, the desorption time is long, the desorption efficiency is low, and the use requirement cannot be met.
Disclosure of Invention
The invention aims to design a novel combined oil gas recovery system and an oil gas recovery method, the oil gas recovery system adopts two tank bodies, desorption inlets and desorption outlets which are uniformly arranged on the side surfaces of the tank bodies and are horizontally opposite are utilized, so that the horizontal desorption gas flow distribution is more uniform, the adsorption and desorption working modes of the two tank bodies are exchanged, the repeated circulation of oil gas adsorption and desorption is realized, the operation is continuously carried out without stopping, and the working efficiency is improved.
The purpose of the invention can be realized by adopting the following technical scheme: a novel combined oil gas recovery system and an oil gas recovery method are disclosed, wherein the oil gas recovery system comprises an oil gas adsorption/desorption module I, an oil gas adsorption/desorption module II, an oil gas inlet pipeline, a desorbed oil gas discharge pipeline, a tail gas discharge pipeline and a control module; the oil gas adsorption/desorption module I and the oil gas adsorption/desorption module II have the same structure and respectively comprise a tank body, a desorption inlet, a desorption outlet, an oil gas inlet and a tail gas outlet; the desorption inlet and the desorption outlet are horizontally and oppositely arranged on the side surface of the tank body and are uniformly distributed and arranged; the oil gas inlet is arranged at the bottom of the tank body; the tail gas outlet is arranged at the top of the tank body; the oil gas inlet pipeline is respectively connected with an oil gas inlet of the oil gas adsorption/desorption module I and an oil gas inlet of the oil gas adsorption/desorption module II; the desorbed gas inlet pipeline comprises an electromagnetic valve, a heat exchanger, an electric heater and a temperature sensor which are sequentially connected, and is respectively connected with desorption inlets of the oil gas adsorption/desorption module I and the oil gas adsorption/desorption module II; the desorption oil gas discharge pipeline comprises an electromagnetic valve, an oil gas concentration instrument and a vacuum pump, wherein the vacuum pump is connected with the oil gas concentration instrument in series and is respectively connected with desorption outlets of the oil gas adsorption/desorption module I and the oil gas adsorption/desorption module II through the electromagnetic valve; the tail gas discharge pipeline consists of a tail gas main pipeline, a tail gas heat exchange pipeline and a tail gas bypass pipeline, the tail gas main pipeline is respectively connected with tail gas outlets of the oil gas adsorption/desorption module I and the oil gas adsorption/desorption module II, the tail gas heat exchange pipeline and the tail gas bypass pipeline are branched from the tail gas main pipeline, and the tail gas heat exchange pipeline is connected with a heat exchanger of a desorbed gas inlet pipeline.
The tank body is internally provided with an adsorbent and a metal adsorption bed layer, the adsorbent is activated carbon, hydrophobic silica gel or a molecular sieve, the metal adsorption bed layer is a metal grating plate, the metal grating plate is connected with the tank body by welding, and the width of the metal grating is greater than the diameter of the adsorbent.
The fan, the electromagnetic valve and the oil-gas concentration meter on the oil-gas inlet pipeline are all electrically connected with the control module; the blower is a roots blower.
And the electromagnetic valve and the temperature sensor on the desorption gas inlet pipeline are electrically connected with the control module.
The oil gas concentration meter and the electromagnetic valve on the desorption oil gas discharge pipeline are electrically connected with the control module; the vacuum pump is a screw vacuum pump.
An oil gas concentration meter is arranged on the tail gas main pipeline, one end of the oil gas concentration meter is connected to a tail gas outlet of the tank body, the other end of the oil gas concentration meter is connected with an electromagnetic valve on the tail gas bypass pipeline, and the electromagnetic valve and the oil gas concentration meter are both electrically connected with the control module;
the tail gas heat exchange pipeline is provided with a one-way valve for preventing the absorption tail gas from flowing into the tank body,
the number of desorption inlets and desorption outlets on the side surface of the tank body is more than two.
The control module is a PLC controller, and is respectively electrically connected with the oil gas inlet pipeline, the desorption gas inlet pipeline and the tail gas discharge pipeline.
The novel oil gas recovery method of the combined type oil gas recovery system adopts desorption inlets and desorption outlets which are arranged on the side surface of the tank body in an evenly distributed mode and are opposite in horizontal direction, so that desorption air flow in the horizontal direction is uniformly distributed, uniform heating of an adsorbent is guaranteed, the oil gas adsorption/desorption module I and the oil gas adsorption/desorption module II are switched under the action of the control module in adsorption and desorption working modes, continuous non-stop operation of oil gas recovery is realized, and the method specifically comprises the following processes:
a. the oil gas adsorption/desorption module I adsorbs oil gas: oil gas enters the oil gas inlet pipeline under the driving of the fan, the control module controls an electromagnetic valve of the oil gas inlet pipeline to enable the oil gas to enter a tank body of the oil gas adsorption/desorption module I, and the oil gas is adsorbed by the oil gas adsorption/desorption module I;
b. the oil gas adsorption/desorption module I desorbs oil gas, and the oil gas adsorption/desorption module II adsorbs oil gas: when the control module detects that the concentration difference value of oil gas at the inlet and the outlet of the tank body of the oil gas adsorption/desorption module I is smaller than a set value C1, the control module controls the electromagnetic valve of the desorption gas inlet pipeline to enable the desorption gas to enter the tank body of the oil gas adsorption/desorption module I for oil gas desorption, and simultaneously controls the electromagnetic valve of the oil gas inlet pipeline to enable the oil gas to enter the tank body of the oil gas adsorption/desorption module II for oil gas adsorption by the oil gas adsorption/desorption module II; when the control module detects that the concentration of oil gas at a desorption outlet of the oil gas adsorption/desorption module I is lower than a set value C2, the oil gas adsorption/desorption module I finishes desorption;
c. the working modes of the oil gas adsorption/desorption module I and the oil gas adsorption/desorption module II are switched and circulated: and the oil gas adsorption/desorption module II performs adsorption-desorption operation under the action of the control module, so that the oil gas adsorption/desorption module I and the oil gas adsorption/desorption module II realize the repeated cycle of oil gas adsorption-desorption.
Compared with the prior art, the invention has the beneficial effects that:
(1) according to the invention, the desorption gas inlet and outlet are arranged on the side surface of the tank body, and a plurality of desorption gas inlets and outlets are uniformly arranged, so that the horizontal desorption gas flow distribution is more uniform, the adsorbent can be heated more uniformly, and the desorption efficiency is improved;
(2) according to the invention, the metal bed layer is adopted in the tank body, and the heat conduction effect of high-temperature desorption gas on the adsorbent is enhanced in the desorption process, so that the heat of the desorption gas can be better transferred to the adsorbent, and the desorption efficiency is improved; the adsorption heat generated when the metal adsorption bed layer is used for adsorption in the oil gas adsorption process is more easily transferred to the oil gas entering the tank body, so that the damage to the adsorbent due to overhigh adsorption heat of the adsorbent in the oil gas adsorption process is relieved;
(3) the invention provides a large amount of heat generated by adsorption to the desorption gas entering the pipeline, and can reduce the power consumption caused by the temperature rise of the desorption gas by only using an electric heater.
(4) The invention adopts two tank bodies, realizes the switching of the adsorption and desorption working modes, and improves the working efficiency because the oil gas recovery is continuously operated without stopping.
(5) The invention realizes the switching from the adsorption to the desorption of the tank body by monitoring the concentration difference of oil gas at the inlet and the outlet of the tank body, and the switching logic is simple and easy to control.
Drawings
FIG. 1 is a schematic diagram of an oil and gas recovery system of the present invention;
FIG. 2 is a schematic structural diagram of a metal adsorption bed in the oil and gas recovery system of the present invention;
FIG. 3 is a working schematic diagram of the oil gas recovery system working mode (1) according to the embodiment of the invention;
FIG. 4 is a working schematic diagram of the oil gas recovery system working mode (2) according to the embodiment of the invention;
the labels in the figure are: 1. electromagnetic valves I and 2, heat exchangers I and 3, check valves I and 4, heat exchangers II and 5, check valves II and 6, electric heaters I and 7, electric heaters II and 8, temperature sensors I and 9, temperature sensors II and 10, tank bodies I and 11, tank bodies II and 12, electromagnetic valves II and 13, electromagnetic valves III and 14, electromagnetic valves IV and 15, electromagnetic valves V and 16, a fan, 17, a vacuum pump and 18, the device comprises electromagnetic valves VI and 19, oil gas concentration instruments I and 20, oil gas concentration instruments II and 21, oil gas concentration instruments III and 22, oil gas concentration instruments IV and 23, oil gas concentration instruments V and 24, electromagnetic valves VII and 25, electromagnetic valves VIII and 26, desorption inlets I and 27, desorption outlets I and 28, desorption inlets II and 29, desorption outlets II and 30, oil gas inlets I and 31, tail gas outlets I and 32, oil gas inlets II and 33, tail gas outlets II and 34 and metal adsorption bed layers.
Detailed Description
The following detailed description of the embodiments of the present invention will be described in conjunction with the accompanying drawings, which are included for the purpose of illustration only and are not to be construed as limiting the invention, and in order to better illustrate the following embodiments, some components of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The connections described in the following examples are all via pipe connections, and the stripping gas is nitrogen.
As shown in fig. 1 and 2, the novel combined oil gas recovery system and the oil gas recovery method comprise an oil gas adsorption/desorption module i, an oil gas adsorption/desorption module ii, an oil gas inlet pipeline, a desorbed oil gas discharge pipeline, a tail gas discharge pipeline and a control module; the oil gas adsorption/desorption module I and the oil gas adsorption/desorption module II are consistent in structure, the oil gas adsorption/desorption module I comprises a tank body I10, desorption inlets I26 and desorption outlets I27 which are uniformly distributed and arranged on the side surface of the tank body I10 and are horizontally opposite, an oil gas inlet I30 arranged at the bottom of the tank body I10 and a tail gas outlet I31 arranged at the top of the tank body, and the oil gas adsorption/desorption module II comprises a tank body II 11, desorption inlets II 28 and desorption outlets II 29 which are uniformly distributed and arranged on the side surface of the tank body II 11 and are horizontally opposite, an oil gas inlet II 32 arranged at the bottom of the tank body II 11 and a tail gas outlet II 33 arranged at the top of the tank body II 11; an adsorbent and a metal
The oil gas inlet pipeline is provided with a
The desorbed gas inlet pipeline comprises a solenoid valve I1, a heat exchanger I2, an electric heater I6 and a temperature sensor I8 which are sequentially connected with a desorption inlet I26 of the oil gas adsorption/desorption module I, and a solenoid valve VI 18, a heat exchanger II 4, an electric heater II 7 and a temperature sensor II 9 which are sequentially connected with a desorption inlet II 28 of the oil gas adsorption/desorption module II.
The desorption oil gas discharge pipeline comprises an electromagnetic valve III 13, an electromagnetic valve V15, an oil gas concentration instrument V23 and a
The tail gas discharge pipeline consists of a tail gas main pipeline, a tail gas heat exchange pipeline and a tail gas bypass pipeline, the tail gas main pipeline is respectively connected with a tail gas outlet I31 of the oil gas adsorption/desorption module I and a tail gas outlet II 33 of the oil gas adsorption/desorption module II, an oil gas concentration instrument II 20 and an oil gas concentration instrument IV 22 are arranged on the tail gas main pipeline, a tail gas bypass pipeline is provided with a solenoid valve VII 24 and a solenoid valve VIII 25, and the oil gas concentration instrument II 20 and the oil gas concentration instrument IV 22 are respectively connected with the solenoid valve VII 24 and the solenoid valve VIII 25; the tail gas heat exchange pipeline is respectively connected with a heat exchanger II 4 and a heat exchanger I2 of the desorption gas inlet pipeline, a one-way valve I3 and a one-way valve II 5 are arranged on the tail gas heat exchange pipeline, and the one-way valve can prevent adsorbed tail gas from flowing into the tank body in desorption; the oil gas concentration meter II 20, the heat exchanger II 4, the one-way valve I3 and the heat exchanger I2 are sequentially connected; the oil gas concentration meter IV 22, the one-way valve II 5 and the heat exchanger I2 are sequentially connected, the tail gas heat exchange pipeline is connected with the heat exchanger, heat generated during adsorption of the oil gas adsorption/desorption module I and the oil gas adsorption/desorption module II can be supplied to desorption gas entering a pipeline, and therefore power consumption caused by temperature rise of the desorption gas due to a single electric heater is reduced.
The control module is a PLC controller and is respectively electrically connected with the oil gas inlet pipeline, the desorption gas inlet pipeline, the tail gas discharge pipeline, the desorption oil gas discharge pipeline, the electromagnetic valves, the temperature sensor and the oil gas concentration meter.
The novel oil gas recovery method of the combined type oil gas recovery system adopts the desorption inlet I26, the desorption outlet I27, the desorption inlet II 28 and the desorption outlet II 29 which are arranged on the side surfaces of the tank body I10 and the tank body II 11 in an evenly distributed mode and are opposite in horizontal direction, so that desorption air flow in the horizontal direction is evenly distributed, uniform heating of an adsorbent is ensured, the oil gas adsorption/desorption module I and the oil gas adsorption/desorption module II are switched under the action of the control module to perform adsorption and desorption, and the method specifically comprises the following processes:
a. the oil gas adsorption/desorption module I adsorbs oil gas:
oil gas enters an oil gas inlet pipeline under the driving of a
b. the oil gas adsorption/desorption module I desorbs oil gas, and the oil gas adsorption/desorption module II adsorbs oil gas:
when the control module detects that the concentration difference value of oil gas at the inlet and the outlet of a tank body I10 of an oil gas adsorption/desorption module I is smaller than a set value C1, the control module controls an electromagnetic valve I1 of a desorption gas inlet pipeline to enable the desorption gas to enter the tank body I10 of the oil gas adsorption/desorption module I for oil gas desorption, and simultaneously controls an electromagnetic valve IV 14 of an oil gas inlet pipeline to enable the oil gas to enter a tank body II 11 of the oil gas adsorption/desorption module II, and the oil gas is adsorbed by the oil gas adsorption/desorption module II; when the control module detects that the concentration of oil gas at a desorption outlet of the oil gas adsorption/desorption module I is lower than a set value C2, the oil gas adsorption/desorption module I finishes desorption;
c. the working modes of the oil gas adsorption/desorption module I and the oil gas adsorption/desorption module II are switched and circulated:
and the oil gas adsorption/desorption module II performs adsorption-desorption operation under the action of the control module, so that the oil gas adsorption/desorption module I and the oil gas adsorption/desorption module II realize the repeated cycle of oil gas adsorption-desorption.
The set values C1 and C2 are set in accordance with the actual adsorption capacity of the adsorption tank.
The detailed working process of the specific embodiment is as follows:
operating mode (1): the process of switching the tank body I10 from the adsorption state to the desorption state is as follows:
as shown in fig. 3, when the
When the tank body I10 is in a desorption stage, the electromagnetic valve I1 is opened and closed periodically, the electromagnetic valve I1 is opened for a set time t1, and desorption gas is supplemented into the tank body I10; after the time t1 elapses, the electromagnetic valve I1 is closed for a set time t2, and the electric heater I6 does not work during the closing of the electromagnetic valve I1, so that unnecessary power waste caused by the fact that the electric heater I6 is operated when desorption gas is not introduced is prevented; in the desorption process of the tank I10, the
Operating mode (2): the process of switching the tank body I10 from the desorption state to the adsorption state is as follows:
as shown in fig. 4, when the inlet and outlet oil gas concentration difference detected by the oil gas concentration meter iii 21 and the oil gas
The invention is not limited to the details of the prior art, and it should be understood that the above-described embodiments of the invention are only examples for clearly illustrating the technical solutions of the invention, and are not intended to limit the specific embodiments of the invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention claims should be included in the protection scope of the present invention claims.
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