CN215627799U - Pressurized multistage absorption/condensation-adsorption two-in-one oil gas recovery system - Google Patents
Pressurized multistage absorption/condensation-adsorption two-in-one oil gas recovery system Download PDFInfo
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Abstract
The utility model discloses a pressurized multistage absorption/condensation-adsorption two-in-one oil gas recovery system, which comprises a pretreatment system, a pressurized multistage absorption system, an adsorption system and a pressurized multistage condensation system, wherein the pretreatment system is respectively connected with the pressurized multistage absorption system and the pressurized multistage condensation system; the pressurized multistage absorption system comprises a multistage absorption tower, and a gas outlet at the top of the multistage absorption tower is connected with the adsorption system; and the gas outlet of the pressurized multistage condensation system is connected with the atmosphere or an adsorption system, and desorption gas generated by vacuumizing the adsorption system is mixed with the pretreated gas and then returns to the pressurized multistage absorption system or the pressurized multistage condensation system. The system fully utilizes respective advantages of absorption, condensation and adsorption, selects an optimal recovery process according to engineering requirements, realizes module combined multifunctional recovery, improves the recovery efficiency of large-flow and high-concentration oil gas, reduces the operation energy consumption, and realizes the standard-reaching discharge of ultralow concentration.
Description
Technical Field
The utility model relates to a pressurized multistage absorption/condensation-adsorption two-in-one oil gas recovery system, and belongs to the technical field of oil gas recovery.
Background
With the continuous acceleration of the industrialization process in China and the continuous increase of energy requirements, light oil products generate a large amount of oil gas in the processes of exploitation, processing, storage, transportation, use and the like due to the volatility of the light oil products, and cause serious pollution to the atmosphere. The oil gas recovery technology is developed to the present, and four oil gas recovery technologies, namely an absorption method, an adsorption method, a condensation method and a membrane separation method, are the most mature. The absorption method can be divided into normal temperature absorption and low temperature absorption according to different process temperatures, and the treatment is carried out according to the solubility difference among the components, but the outlet concentration of the traditional absorption process is higher, so that the strict emission requirement is difficult to meet; the condensation method is a method for recovering oil gas under the condition of low temperature according to the boiling point of each component, but the method has strict requirements on condensation temperature and large operation energy consumption; although the membrane separation method has good recovery effect, the membrane has high manufacturing cost and is not suitable for oil and gas with large treatment capacity; the adsorption method is widely applied to the oil gas recovery technology due to simple process flow, low cost and easy recovery, but the adsorption capacity of the adsorbent is limited, the outlet concentration rises rapidly after the adsorption is penetrated, the desorption and regeneration of the adsorbent are difficult, the desorption effect of the desorption process suitable for industrial application at the present stage is not ideal, the reuse rate of the adsorbent is low, the cost of the oil gas recovery technology is increased, and the resource utilization rate is also reduced. Therefore, the conventional single recovery technology or the integration of two recovery methods is difficult to efficiently treat the oil gas with high flow and high concentration, and the whole recovery process has high energy consumption and resource waste and cannot reach the standard for emission.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects of the prior art and provide a pressurized multistage absorption/condensation-adsorption two-in-one oil gas recovery system, which utilizes pressurized cooling pretreatment, pressurized multistage absorption/condensation and multifunctional adsorption tower adsorption to improve the recovery efficiency of large-flow and high-concentration oil gas, reduce the operation energy consumption, realize ultralow-concentration standard discharge, fully utilize the respective advantages of absorption, condensation and adsorption and skillfully realize module combined multifunctional recovery.
In order to solve the technical problems, the utility model provides a pressurized multistage absorption/condensation-adsorption two-in-one oil gas recovery system, which comprises a pretreatment system, a pressurized multistage absorption system, an adsorption system and a pressurized multistage condensation system, wherein the pretreatment system is respectively connected with the pressurized multistage absorption system and the pressurized multistage condensation system; the pressurized multistage absorption system comprises a multistage absorption tower, an exhaust port at the top of the multistage absorption tower is connected with the adsorption system, a rich oil outlet at the bottom of the multistage absorption tower is connected with a desorption tower, and an exhaust port at the top of the desorption tower is connected with an oil-water separator; the air outlet of the pressurized multistage condensation system is connected with the atmosphere or the adsorption system, and the liquid outlet at the bottom of the pressurized multistage condensation system is connected with the oil-water separator.
Furthermore, the pretreatment system comprises a pressurizing device, a three-way valve, a water-cooling heat exchanger and a gate valve, wherein the gas collection pipeline coming from the site is connected with the inlet of the pressurizing device through a flame arrester, a pressure sensor, a temperature sensor, a ball valve and an air suction pump, the gas outlet of the pressurizing device is connected with the inlet of the water-cooling heat exchanger through the three-way valve, and the gas outlet of the water-cooling heat exchanger is connected with the gas inlet of the compressor through the gate valve.
Furthermore, the pretreatment system is connected with a pressurized multistage absorption system through a compressor, the outlet of the compressor is connected with the air inlet at the bottom of the multistage absorption tower through a pressure sensor and a three-way valve, and the air outlet at the top of the multistage absorption tower is connected with the air inlet three-way valve of the adsorption system through a gate valve; the rich oil outlet at the bottom of the multistage absorption tower is connected with the inlet at the top of the desorption tower through a gate valve, a temperature sensor and a centrifugal pump, the liquid outlet at the side surface of the multistage absorption tower is connected with the lower-layer spray port of the multistage absorption tower through an automatic control valve and the centrifugal pump, and the lean oil outlet at the bottom of the desorption tower is connected with the upper-layer spray port of the multistage absorption tower through the gate valve, the centrifugal pump, a heat exchanger and a flowmeter; an exhaust port at the top of the desorption tower is connected with an oil-water separator through a gate valve, a vacuum pump, a compressor and a heat exchanger, and an air outlet at the top of the oil-water separator is connected with an inlet of the compressor through the gate valve.
Further, pretreatment systems is connected with pressurization multistage condensing system through the compressor, pressurization multistage condensing system is including the one-level condensation that connects gradually, second grade condensation and tertiary condensation, the compressor export is through pressure sensor, three-way valve connection one-level condensation air inlet, tertiary condensation exit linkage atmosphere or through gate valve and adsorption system air inlet three-way valve connection, one-level condensation bottom leakage fluid dram and oil water separator access connection, second grade condensation and tertiary condensation bottom leakage fluid dram all with oil water separator access connection, oil water separator bottom all is equipped with two discharge ports, gate valve and buffer water tank access connection, the outer defeated pipeline is connected to the gate valve, buffer water tank export is connected with water cooled heat exchanger through the centrifugal pump.
Further, adsorption system is equipped with two adsorption towers, and adsorption tower air inlet three-way valve is connected with tertiary condensation gas outlet gate valve and multistage absorption tower gas outlet gate valve, and adsorption tower gas vent three-way valve is connected with temperature sensor, spark arrester, and adsorption tower bottom three-way valve is through vacuum pump, temperature sensor and compressor access connection, and constant temperature water bath case is imported and exported respectively and is imported and exported the three-way valve with adsorption tower, inside heat transfer coil pipe and be connected.
Furthermore, the oil-water separator is a horizontal separator, a liquid level meter and an oil-water separator are arranged on the side surface, two partition plates are arranged on the left side and the right side of the inside of the oil-water separator, and the inside of the oil-water separator is divided into a left water area, a middle cache area and a right VOCs storage area; the water area on the left side of the oil-water separator is connected with a buffer water tank and is controlled to be opened and closed by a gate valve; the oil-water separator and the outside of the buffer water tank are integrally provided with heat preservation layers, and the thickness of each heat preservation layer is 100-300 mm.
Furthermore, an intensive heat exchanger is arranged in the desorption tower, a heat source of the heat exchanger is provided by the outside, and a temperature sensor for monitoring the temperature in the tower in real time and a pressure sensor for monitoring the pressure in the tower in real time are arranged on the side surface of the tower body.
Further, the multistage absorption tower is a vertical tower, the multistage absorption tower is of a segmented spraying type and is provided with two layers of spraying, a spraying inlet at the upper layer is connected with the flowmeter and the heat exchanger, the cold energy of the heat exchanger is provided by the outside, and the spraying amount at the upper layer is 10-100 m3H; the lower spraying inlet is connected with the centrifugal pump and the automatic regulating valve.
Further, the pressurized multistage condensation system comprises primary condensation, secondary condensation and tertiary condensation, wherein the temperature of each stage of condensation heat exchanger is respectively designed to be 1-5 ℃, 40-60 ℃ and 70-100 ℃, and the area ratio of gas channels of the primary condensation chamber is 3.5-6.0: 1, the heat exchange area ratio is 0.5-1.5: 1; the area ratio of the gas channel of the secondary condensation is 5.5-8.0: 1, the heat exchange area ratio is 1.5-3.5: 1; the area ratio of the gas channel of the third-stage condensation condensing chamber is 3.0-5.0: 1, the heat exchange area ratio is 0.5-1.5: 1.
further, the oil-water separator is a horizontal separator, the length of the horizontal separator is 1000-3000 mm, the diameter of the horizontal separator is 500-1500 mm, and a liquid level meter with the height of 400-1200 mm is arranged on the side surface of the horizontal separator; the left side and the right side of the inside of the oil-water separator are provided with two partition plates with the height of 500-1200 mm, the distance between the partition plates is 500-1200 mm, and the inside of the oil-water separator is divided into a left water area, a middle cache area and a right VOCs storage area; the left water area of the oil-water separator is connected with a buffer water tank, the opening and closing of the buffer water tank are controlled by a gate valve, the length of the buffer water tank is 800-1500 mm, and the diameter of the buffer water tank is 500-1000 mm; the oil-water separator and the outside of the buffer water tank are integrally provided with heat preservation layers, and the thickness of each heat preservation layer is 100-300 mm.
The utility model achieves the following beneficial effects:
1. compared with normal pressure absorption or condensation, the pressurized multistage absorption/condensation-adsorption two-in-one oil gas recovery system fully exerts respective advantages of absorption, condensation and adsorption, avoids the defects of a single recovery method, and skillfully realizes the module combined multifunctional recovery effect.
2. The utility model can select an optimized recovery system according to engineering requirements, adopts a pressurized multistage absorption-adsorption recovery system for oil gas with large flow, high concentration and easy mutual solubility with an absorbent, adopts a pressurized multistage condensation-adsorption recovery system for oil gas with medium flow, high concentration, low light hydrocarbon content and high boiling point, realizes high recovery rate (more than or equal to 99 percent) and ultralow concentration (less than or equal to 60 mg/m)3) And (4) reaching the emission target.
Drawings
FIG. 1 is a flow chart of a pressurized multistage absorption/condensation-adsorption two-in-one oil gas recovery system according to the present invention;
the reference numbers are listed below:
1. 33-flame arrestors, 2, 11, 22, 24, 52, 60, 63-pressure sensors, 3, 20, 25, 26, 27, 28, 29, 30, 32, 40, 58, 65, 90-temperature sensors, 4, 43, 51, 54, 69, 77, 82, 84-ball valves, 5-suction pumps, 6-pressurizing equipment, 7, 12, 31, 34, 35, 36, 53-three-way valves, 8, 76, 83-heat exchangers, 9, 80-compressors, 10, 21, 23, 41, 42, 50, 57, 59, 61, 66, 75, 79, 86, 89-gate valves, 13-primary condensation, 14-secondary condensation, 15-tertiary condensation, 16-pressurized multistage condensation system, 17-pretreatment system, 18-adsorption system, 19-pressurized multistage absorption system, 37, 38, 44, 49, 72-level meters, 39, 78-vacuum pumps, 45, 67, 68, 71-centrifugal pumps, 46, 47-adsorption columns, 48. 55, 88-oil-water separator, 56-buffer water tank, 62-constant temperature water bath tank, 64-absorption tower, 70-automatic control valve, 73, 74-flowmeter, 81-heat source output, 85-heat source input, 87-desorption tower.
Detailed Description
The utility model is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
The first embodiment is as follows:
a great amount of oil gas is generated in the oil loading and unloading process of a certain wharf, and the oil gas discharge amount is 1500m3H, concentration 563.367 g/m3High concentration oil gas easily soluble in special absorbent, and the emission concentration of the treated oil gas is required to be less than 80 mg/m3The efficient recovery of oil gas by a pressurized multistage absorption-adsorption oil gas recovery system is described with the help of the attached figure 1.
(1) The technical scheme of the system of the utility model is as follows:
a pressurized multistage absorption-adsorption oil gas recovery system comprises: the system mainly comprises a flame arrester 1, pressure sensors 2, 11 and 63, temperature sensors 3, 40 and 90, ball valves 4, 43, 51, 54, 82 and 84, an air suction pump 5, a three-way valve 12, a heat exchanger 83, compressors 9 and 80, gate valves 41, 42, 50, 57, 59, 61, 79, 86 and 89, liquid level meters 37, 38, 44 and 49, vacuum pumps 39 and 78, a centrifugal pump 45, oil- water separators 48, 55 and 88, a buffer water tank 56, a constant-temperature water bath tank 62, a heat source output 81, a heat source input 85, a desorption tower 87, a pressurized multistage condensation system 16, a pretreatment system 17, an adsorption system 18, a pressurized multistage absorption system 19 and pipelines.
The pretreatment system 17 of the pressurized multistage absorption-adsorption oil gas recovery system consists of a gate valve 1, a pressurizing device 6, a three-way valve 7 and a water-cooled heat exchanger 8.
Further, the pressure of the pressurizing device 6 was 0.2 MPa.
Further, the gas passage area ratio of the water-cooled heat exchanger 8 is 5.0: 1, the heat exchange area ratio is 1.5: 1, the temperature of cooling medium water is 20 ℃.
The pressurized multistage absorption system 19 of the pressurized multistage absorption-adsorption oil gas recovery system consists of gate valves 66 and 75, centrifugal pumps 67, 68 and 71, flow meters 73 and 74, ball valves 69 and 77, temperature sensors 58 and 65, a multistage absorption tower 64, a heat exchanger 76, an automatic control valve 70, a pressure sensor 60 and a liquid level meter 72.
Further, the multistage absorption tower 64 is a vertical tower with a height of 5000 mm and a diameter of 1200 mm, and the multistage absorption tower 64 is designed to be a sectional spray typeTwo layers of spraying are carried out, the spraying inlet at the upper layer is connected with a flow meter 74 and a heat exchanger 76, and the spraying amount of diesel oil is 70 m3/h。
And the adsorption system adsorption towers 46 and 47, the three- way valves 31, 34, 35, 36 and 53, the pressure sensors 24 and 52, the temperature sensors 25, 26, 27, 28, 29, 30 and 32 and the flame arrester 33 of the pressurized multistage absorption-adsorption oil gas recovery system.
Further, the height of the adsorption towers 46 and 47 is 6000 mm, the diameter of the adsorption towers is 1500mm, finned tubes are arranged inside the adsorption towers and uniformly distributed in the towers, and air inlets of the adsorption towers 46 and 47 are controlled and switched by a three-way valve 34.
Further, heat exchangers are arranged in the adsorption towers 46 and 47, the inlet and outlet of each heat exchanger are controlled to be opened and closed by three- way valves 53 and 36 and are connected with the inlet and outlet of the constant temperature water bath box 62, the temperature of the constant temperature water bath box 62 is 85 ℃, and the constant temperature water bath box is 2000 mm long, 1200 mm wide and 1000 mm high.
The desorption tower 87 of the pressurized multistage absorption-adsorption oil gas recovery system has the height of 3000 mm and the diameter of 1000 mm, an intensive heat exchanger is arranged in the desorption tower, heat is provided from the outside, a temperature sensor 90 and a pressure sensor 63 are arranged on the side surface of the tower body, and the temperature and the pressure in the tower are monitored in real time.
The oil- water separators 48 and 88 of the pressurized multistage absorption-adsorption oil-gas recovery system are horizontal separators, the length is 2500 mm, and the diameter is 1000 mm.
Further, the oil- water separator 48, 88 side is equipped with highly is 800mm level gauge, and the inside left and right sides is equipped with 2 highly is 800mm baffles, and the distance is 1200 mm between the baffle, divides into left water zone, middle buffer zone, the VOCs storage area on right side with oil- water separator 48, 88 is inside.
(2) A pressurized multistage absorption-adsorption oil gas recovery system has the following connection mode:
firstly, an air collecting pipeline coming from a loading and unloading site of a wharf is connected with an inlet of a pressurizing device 6 through a flame arrester 1, a pressure sensor 2, a temperature sensor 3, a ball valve 4 and an air pump 5, an outlet pipeline of the pressurizing device 6 is connected with an inlet of a water-cooling heat exchanger 8 through a three-way valve 7, an air outlet of the water-cooling heat exchanger 8 is connected with an air inlet of a compressor 9 through a gate valve, and an outlet of the compressor 9 is connected with a three-way valve 12.
Secondly, an outlet of the compressor 9 is connected with an air inlet at the bottom of the multistage absorption tower 64 through a pressure sensor 11 and a three-way valve 12, an air outlet at the top of the multistage absorption tower 64 is connected with an air inlet three-way valve 34 of the adsorption system 18 through a gate valve 75, a rich oil outlet at the bottom of the multistage absorption tower 64 is connected with an inlet at the top of the desorption tower 87 through a gate valve 66, a temperature sensor 65 and a centrifugal pump 67, a liquid outlet at the side surface of the bottom of the multistage absorption tower 64 is connected with a lower layer spray port of the multistage absorption tower 64 through an automatic control valve 70 and a centrifugal pump 71, a lean oil outlet at the bottom of the desorption tower 87 is connected with a gate valve 69 and a centrifugal pump 68, the heat exchanger 76 and the flow meter 74 are connected with the upper layer spray port of the multistage absorption tower 64, the exhaust port at the top of the desorption tower 87 is connected with the oil-water separator 88 through the gate valve 79, the vacuum pump 78, the compressor 80 and the heat exchanger 83, and the air outlet at the top of the oil-water separator 88 is connected with the inlet of the compressor 9 through the gate valve 82.
③ the three-way valve 34 of the air inlet of the adsorption tower 46 and 47 is connected with the outlet gate valve 75 of the absorption tower 64, the three-way valve 31 of the air outlet of the adsorption tower 46 and 47 is connected with the temperature sensor 32 and the flame arrester 33, the three-way valve 35 at the bottom of the adsorption tower 46 and 47 is connected with the inlet of the compressor 9 through the vacuum pump 39 and the temperature sensor 40, and the inlet and the outlet of the constant temperature water bath box 62 are respectively connected with the three- way valves 53 and 36 of the inlet and the outlet of the heat exchange coil in the adsorption tower 46 and 47.
(3) A pressurized multistage absorption-adsorption oil gas recovery system recovery method comprises the following steps:
firstly, an air inlet gate valve 4 is opened, high-concentration large-flow oil gas generated in the railway loading and unloading process enters a pretreatment system 17 through a flame arrester 1, a pressure sensor 2 and a temperature sensor 3 under the action of an air pump 5, the oil gas is pressurized and concentrated through a pressurizing device 6 and then enters a water-cooling heat exchanger 8 for cooling treatment, part of generated condensate liquid is stored in an oil-water separator 48 through a gate valve 42, the condensate water is stored in a cache water tank 56 through a gate valve 51 under the separation action of the oil-water separator 48, and the liquid oil gas is transported and reused.
Secondly, pretreated oil gas enters an air inlet at the bottom of the multistage absorption tower 64 after passing through the compressor 9, the pressure sensor 11 and the three-way valve 12, most of the oil gas is dissolved and absorbed by the low-temperature absorbent under the action of countercurrent contact with the low-temperature absorbent, generated rich oil liquid is settled at the bottom of the multistage absorption tower 64, the opening degree of the automatic control valve 70 is automatically adjusted according to the indication number of a liquid level meter 72 on the side surface of the absorption tower 64, part of the rich oil absorbent is conveyed to a lower-layer spray opening of the multistage absorption tower 64 for cyclic utilization under the action of a centrifugal pump 71, most of the rich oil absorbent is conveyed to a desorption tower 87 for desorption and regeneration under the action of a centrifugal pump 67, the heated and vacuumized fresh absorbent is conveyed to an upper-layer spray opening of the absorption tower 64 for cyclic utilization through a gate valve 69 and a heat exchanger 76 under the action of the centrifugal pump 68, and the cold energy of the heat exchanger 76 is provided by the outside; oil gas generated after the rich oil absorbent is heated and vacuum desorbed is pressurized by a compressor 80 and then enters a heat exchanger 83, and the generated mixed liquid is stored in an oil-water separator 88 and is output for reuse after separation; the unliquefied oil gas is delivered to the inlet of the pressurized multi-stage absorption system 19 to be mixed with the pretreated gas and then returned to the pressurized multi-stage absorption system 19.
Thirdly, the gas treated by the pressurized multistage absorption system 19 is discharged from the top of the multistage absorption tower 64, the stop valve 75 is opened to enter the adsorption system 18, the gas firstly enters the adsorption tower 46 by adjusting the gas inlet three-way valve 34, the three- way valves 34 and 31 are adjusted after the adsorption tower 46 is absorbed and penetrated, the adsorption tower 47 is switched to adsorb, meanwhile, the three- way valves 53, 35 and 36 are opened to vacuumize, desorb and regenerate the adsorption tower 46, the desorbed high-concentration oil gas is mixed with the pretreated gas by the gate valve 41 and then returns to the pressurized multistage absorption system 19 for reprocessing, and the heating source of the adsorption tower is from a constant temperature water bath; after pressurization cooling pretreatment, pressurization multistage absorption and adsorption, the discharge concentration of the outlets of the adsorption towers 46 and 47 is lower than 80 mg/m3And the total recovery rate of oil gas is more than 99%.
Example two:
a large amount of oil gas, mainly containing heavy components of C3 and above, is discharged in the oil loading and unloading process of a certain refinery plant, the light hydrocarbon content is low, and the discharge amount is 500m3H, concentration 456.54 g/m3The oil gas emission concentration after treatment is required to be less than 60 mg/m3Aiming at the oil gas with medium flow, high concentration and low light hydrocarbon component content, a pressurized multistage condensation-adsorption oil gas recovery system is utilized to efficiently recover the oil gas, and the oil gas is attached by means ofFig. 1 illustrates this.
(1) The technical scheme of the utility model is as follows:
a pressurized multi-stage condensation-adsorption oil gas recovery system comprises: the system mainly comprises a flame arrester 1, pressure sensors 2, 11 and 63, temperature sensors 3, 40 and 90, ball valves 4, 43, 51, 54, 82 and 84, an air extraction pump 5, a three-way valve 12, a heat exchanger 83, compressors 9 and 80, gate valves 41, 42, 50, 57, 59, 61, 79, 86 and 89, liquid level meters 37, 38, 44 and 49, vacuum pumps 39 and 78, a centrifugal pump 45, oil- water separators 48, 55 and 88, a buffer water tank 56, a constant temperature water bath tank 62, a heat source output 81, a heat source input 85, a desorption tower 87, a multi-stage pressurization condensation system 16, a pretreatment system 17, an adsorption system 18, a pressurization multi-stage absorption system 19 and pipelines.
The pretreatment system 17 of the pressurized multistage condensation-adsorption oil gas recovery system consists of a pressurizing device 6, a three-way valve 7, a water-cooled heat exchanger 8 and a gate valve 10.
Further, the pressure of the pressurizing apparatus was 0.2 MPa.
Further, the gas passage area ratio of the water-cooled heat exchanger 8 is 3.5: 1, the heat exchange area ratio is 1.5: 1, the temperature of cooling medium water is 15 ℃.
And the pressurizing multi-stage condensation system 16 of the oil gas recovery system of pressurizing multi-stage condensation-adsorption comprises a first-stage condensation 13, a second-stage condensation 14, a third-stage condensation 15, gate valves 21 and 23, a pressure sensor 22 and a temperature sensor 20.
Further, the temperatures of all stages of condensing heat exchangers are respectively designed to be 4 ℃, 40 ℃ and 80 ℃.
Further, the gas passage area ratio of the primary condensation chamber is 4.0: 1, the heat exchange area ratio is 1.5: 1, the gas passage area ratio of the secondary condensation chamber is 6.0: 1, heat exchange area ratio of 2.0: 1, the gas passage area ratio of the three-stage condensation chamber is 4.0: 1, the heat exchange area ratio is 1.5: 1.
③ the adsorption system 18 of the oil gas recovery system of the pressurized multi-stage condensation-adsorption comprises adsorption towers 46 and 47, three- way valves 31, 34, 35, 36 and 53, pressure sensors 24 and 52, temperature sensors 25, 26, 27, 28, 29, 30 and 32 and a flame arrester 33.
Further, the height of adsorption towers 46 and 47 is 3000 mm, the diameter is 800mm, finned tubes are arranged inside the adsorption towers and uniformly distributed in the towers, and air inlets of the adsorption towers 46 and 47 are controlled and switched by a three-way valve 34 and are connected with an exhaust port of the pressurized multistage condensation system 16.
Further, heat exchangers are arranged in the adsorption towers 46 and 47, the inlet and outlet of each heat exchanger are controlled to be opened and closed by three- way valves 53 and 36 and are connected with a constant temperature water bath box 62, the temperature of the constant temperature water bath box 62 is 85 ℃, and the constant temperature water bath box 62 is 1000 mm long, 800mm wide and 800mm high.
And fourthly, the oil- water separators 48 and 55 of the pressurized multistage condensation-adsorption oil-gas recovery system are horizontal separators, the length of each horizontal separator is 1000 mm, and the diameter of each horizontal separator is 800 mm.
Further, the oil- water separator 48, 55 side are equipped with highly be 600 mm level gauge, and the inside left and right sides is equipped with 2 highly be 600 mm baffles, and the distance is 500mm between the baffle, with the inside VOCs storage area that divide into left water district, middle buffer memory district, right side of oil- water separator 48, 55.
(2) A pressurized multistage condensation-adsorption oil gas recovery system has the following connection mode:
firstly, a gas collecting pipeline of a chemical plant is connected with an inlet of a pressurizing device 6 through a flame arrester 1, a pressure sensor 2, a temperature sensor 3, a ball valve 4 and an air pump 5, an air outlet pipeline of the pressurizing device 6 is connected with an inlet of a water-cooling heat exchanger 8 through a three-way valve 7, an air outlet of the water-cooling heat exchanger 8 is connected with an air inlet of a compressor 9 through a gate valve, and an outlet of the compressor 9 is connected with a three-way valve 12.
The outlet of the compressor 9 is connected with a first-level condensation 13 air inlet through a pressure sensor 11 and a three-way valve 12, a third-level condensation outlet is connected with atmosphere or is connected with an adsorption system air inlet three-way control valve 34 through a gate valve 23, a bottom liquid outlet of a first-level condensation 13 condensation chamber is connected with an inlet of an oil-water separator 48, bottom liquid outlets of a second-level condensation 14 condensation chamber and a third-level condensation 15 condensation chamber are connected with an inlet of an oil-water separator 55, two discharge ports are arranged at the bottoms of the oil-water separator 48 and the oil-water separator 55, gate valves 51 and 54 are connected with inlets of a cache water tank 56, the gate valves 50 and 57 are connected with an external conveying pipeline, and an outlet of a cache water pipe is connected with a water-cooling heat exchanger 8 through a centrifugal pump 45.
③ the three-way valve 34 of the air inlet of the adsorption tower 46 and 47 is connected with the gate valve 23 of the outlet of the tertiary condensation 15, the three-way valve 31 of the air outlet of the adsorption tower 46 and 47 is connected with the temperature sensor 32 and the flame arrester 33, the three-way valve 35 of the bottom of the adsorption tower 46 and 47 is connected with the inlet of the compressor 9 through the vacuum pump 39 and the temperature sensor 40, and the inlet and the outlet of the constant temperature water bath box 62 are respectively connected with the three- way valves 53 and 36 of the inlet and the outlet of the heat exchange coil in the adsorption tower 46 and 47.
(3) A pressurized multistage condensation-adsorption oil gas recovery system recovery method comprises the following steps:
firstly, an air inlet gate valve 4 is opened, high-concentration oil gas discharged by a chemical plant enters a pretreatment system 17 through a flame arrester 1, a pressure sensor 2 and a temperature sensor 3 under the action of an air pump 5, enters a water-cooling heat exchanger 8 for cooling treatment after being pressurized and concentrated by a pressurizing device 6, part of generated condensate is stored in an oil-water separator 48 through a gate valve 42, the condensate is stored in a cache water tank 56 through a gate valve 51 under the separation action of the oil-water separator 48, and liquid oil is transported and reused.
Secondly, after the pretreated oil gas passes through a compressor 9, a pressure sensor 11 and a three-way valve 12, the pretreated oil gas enters a pressurized multi-stage condensation system 16, sequentially passes through a first-stage condensation 13, a second-stage condensation 14 and a third-stage condensation 15, most of water vapor and part of heavy components in the oil gas are condensed off after the oil gas passes through the first-stage condensation 13, the second-stage condensation 14, most of the oil gas is condensed and recovered after the oil gas passes through the second-stage condensation 14, a small amount of light component-containing waste gas passes through the first-stage condensation 13 and the second-stage condensation 14 and then enters the third-stage condensation 15 for deep condensation treatment, in the process, a large amount of light components are saturated and are changed from a gaseous state to a liquid state, the condensate of the first-stage condensation 13 flows into a buffer area in the middle of an oil-water separator 48 under the self gravity effect, the condensate generated by the second-stage condensation 14 and the third-stage condensation 15 flows into a buffer area in the middle of an oil-water separator 55 and a left-side water area and a right-VOCs area after separation, and a left-side VOCs area are observed by a liquid level meter 49, And 44, opening the gate valves 51 and 54, flowing into a buffer water tank 56, outputting the liquid oil through the gate valves 50 and 57 for reuse, and mixing the low-temperature water in the buffer water tank with make-up water through a gate valve 59 under the action of a centrifugal pump 45 to serve as a cooling medium to enter the water-cooled heat exchanger 8.
③ opening the closing gate valve 21The gate valve 23 adjusts the air inlet three-way valve 34 of the adsorption system 18 to make the three-stage condensed gas firstly enter the adsorption tower 46, after the adsorption tower 46 is absorbed and penetrated, the adsorption tower 47 is switched to adsorb by adjusting the three- way valves 34 and 31, meanwhile, the three- way valves 53, 35 and 36 are opened to perform vacuum pumping, desorption and regeneration on the adsorption tower 46, and the desorbed high-concentration oil gas is mixed with the pretreated gas through the gate valve 41 and then enters the pressurized multi-stage condensation system 16 for reprocessing. The high-concentration oil gas after the pressurization cooling pretreatment, the pressurization multistage condensation and the adsorption recovery treatment is sequentially carried out, and the discharge concentration of the outlets of the adsorption towers 46 and 47 is lower than 60 mg/m3And the total recovery rate of oil gas is more than 99%.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (10)
1. The pressurized multi-stage absorption/condensation-adsorption two-in-one oil gas recovery system is characterized by comprising a pretreatment system (17), a pressurized multi-stage absorption system (19), an adsorption system (18) and a pressurized multi-stage condensation system (16), wherein the pretreatment system (17) is respectively connected with the pressurized multi-stage absorption system (19) and the pressurized multi-stage condensation system (16); the pressurized multistage absorption system (19) comprises a multistage absorption tower (64), wherein a gas outlet at the top of the multistage absorption tower (64) is connected with the adsorption system (18), a rich oil outlet at the bottom of the multistage absorption tower (64) is connected with a desorption tower (87), and a gas outlet at the top of the desorption tower (87) is connected with an oil-water separator (88); the air outlet of the pressurized multi-stage condensation system (16) is connected with the atmosphere or is connected with the adsorption system (18), and the liquid outlet at the bottom of the pressurized multi-stage condensation system (16) is connected with the oil-water separators (48) and (55).
2. The pressurized multistage absorption/condensation-adsorption two-in-one oil gas recovery system according to claim 1, wherein the pretreatment system comprises a pressurizing device (6), a three-way valve (7), a water-cooled heat exchanger (8) and a gate valve (10), an on-site gas collection pipeline passes through a flame arrester (1), a pressure sensor (2), a temperature sensor (3), a ball valve (4) and an air pump (5) to be connected with an inlet of the pressurizing device (6), an air outlet of the pressurizing device (6) passes through the three-way valve (7) to be connected with an inlet of the water-cooled heat exchanger (8), and an air outlet of the water-cooled heat exchanger (8) passes through the gate valve (10) to be connected with an air inlet of a compressor (9).
3. The pressurized multi-stage absorption/condensation-adsorption two-in-one oil gas recovery system according to claim 1, wherein the pretreatment system is connected with the pressurized multi-stage absorption system through a compressor (9), an outlet of the compressor (9) is connected with a bottom air inlet of the multi-stage absorption tower (64) through a pressure sensor (11) and a three-way valve (12), and a top air outlet of the multi-stage absorption tower (64) is connected with an air inlet three-way valve (34) of the adsorption system (18) through a gate valve (75); a rich oil outlet at the bottom of the multistage absorption tower (64) is connected with an inlet at the top of the desorption tower (87) through a gate valve (66), a temperature sensor (65) and a centrifugal pump (67), a liquid outlet at the side surface of the multistage absorption tower (64) is connected with a lower-layer spray opening of the multistage absorption tower (64) through an automatic control valve (70) and a centrifugal pump (71), and a lean oil outlet at the bottom of the desorption tower (87) is connected with an upper-layer spray opening of the multistage absorption tower (64) through a gate valve (69), a centrifugal pump (68), a heat exchanger (76) and a flow meter (74); an exhaust port at the top of the desorption tower (87) is connected with an oil-water separator (88) through a gate valve (79), a vacuum pump (78), a compressor (80) and a heat exchanger (83), and an air outlet at the top of the oil-water separator (88) is connected with an inlet of the compressor (9) through a gate valve (82).
4. The pressurized multi-stage absorption/condensation-adsorption two-in-one oil gas recovery system according to claim 1, wherein the pretreatment system is connected with the pressurized multi-stage condensation system through a compressor (9), the pressurized multi-stage condensation system comprises a first-stage condensation (13), a second-stage condensation (14) and a third-stage condensation (15) which are connected in sequence, an outlet of the compressor (9) is connected with an air inlet of the first-stage condensation (13) through a pressure sensor (11) and a three-way valve (12), an outlet of the third-stage condensation (15) is connected with the atmosphere or is connected with an air inlet three-way valve (34) of the adsorption system (18) through a gate valve (23), a bottom liquid discharge port of a condensation chamber of the first-stage condensation (13) is connected with an inlet of an oil-water separator (48), and bottom liquid discharge ports of the condensation chambers of the second-stage condensation (14) and the third-stage condensation (15) are connected with an inlet of the oil-water separator (55), the bottom of each oil-water separator (48) and (55) is provided with two discharge ports, the gate valves (51) and (54) are connected with the inlet of the buffer water tank (56), the gate valves (50) and (57) are connected with an external conveying pipeline, and the outlet of the buffer water tank (56) is connected with the water-cooled heat exchanger (8) through a centrifugal pump (45).
5. The pressurized multi-stage absorption/condensation-adsorption two-in-one oil gas recovery system according to claim 4, wherein the adsorption system (18) is provided with two adsorption towers (46) and (47), the three-way valves (34) at the air inlets of the adsorption towers (46) and (47) are connected with the three-stage condensation (15) air outlet gate valve (23) and the multi-stage absorption tower (64) air outlet gate valve (75), the three-way valves (31) at the air outlets of the adsorption towers (46) and (47) are connected with the temperature sensor (32) and the flame arrester (33), the three-way valves (35) at the bottoms of the adsorption towers (46) and (47) are connected with the inlet of the compressor (9) through the vacuum pump (39) and the temperature sensor (40), and the inlet and the outlet of the constant temperature water bath tank (62) are respectively connected with the three-way valves (53) and (36) at the inlet and the outlet of the internal heat exchange coil of the adsorption towers (46) and (47).
6. The pressurized multi-stage absorption/condensation-adsorption two-in-one oil gas recovery system according to claim 1, wherein the oil-water separator (48), (55), (88) is a horizontal separator, and is provided with liquid level meters (49), (44), (37) on the side; two partition plates are arranged on the left side and the right side inside the oil-water separators (48), (55) and (88), and the inside of the oil-water separators (48), (55) and (88) is divided into a left water area, a middle cache area and a right VOCs storage area; the left water area of the oil-water separators (48), (55) and (88) is connected with a buffer water tank (56) and is controlled to be opened and closed by gate valves (51) and (54); the oil-water separators (48) and (55) and the buffer water tank (56) are integrally provided with heat insulation layers, and the thickness of each heat insulation layer is 100-300 mm.
7. The pressurized multistage absorption/condensation-adsorption two-in-one oil gas recovery system according to claim 1, wherein the desorption tower (87) is internally provided with a dense heat exchanger, the heat source of the heat exchanger is provided by the outside, and the side surface of the tower body is provided with a temperature sensor (90) for monitoring the temperature in the tower in real time and a pressure sensor (63) for monitoring the pressure in the tower in real time.
8. The pressurized multistage absorption/condensation-adsorption two-in-one oil gas recovery system according to claim 1, wherein the multistage absorption tower (64) is a vertical tower, the multistage absorption tower (64) is a segmented spray type and is provided with two layers of spray, an upper layer of spray inlet is connected with the flow meter (74) and the heat exchanger (76), the cold energy of the heat exchanger (76) is provided by the outside, and the upper layer of spray amount is 10-100 m3H; the lower layer spraying inlet is connected with a centrifugal pump (71) and an automatic regulating valve (70).
9. The pressurized multi-stage absorption/condensation-adsorption two-in-one oil gas recovery system according to claim 1, wherein the pressurized multi-stage condensation system (16) comprises a first-stage condensation (13), a second-stage condensation (14) and a third-stage condensation (15), the temperatures of condensation heat exchangers of each stage are respectively designed to be 1-5 ℃, -40 to-60 ℃ and-70 to-100 ℃, and the area ratio of gas channels of condensation chambers of the first-stage condensation (13) is 3.5-6.0: 1, the heat exchange area ratio is 0.5-1.5: 1; the area ratio of the gas channel of the secondary condensation (14) is 5.5-8.0: 1, the heat exchange area ratio is 1.5-3.5: 1; the gas passage area ratio of the three-stage condensation (15) and the condensing chamber is 3.0-5.0: 1, the heat exchange area ratio is 0.5-1.5: 1.
10. the pressurized multistage absorption/condensation-adsorption two-in-one oil gas recovery system according to claim 1, wherein the oil-water separator (48), (55), (88) is a horizontal separator, the length is 1000-3000 mm, the diameter is 500-1500 mm, and the side surface is provided with liquid level meters (49), (44), (37) with the height of 400-1200 mm; two partition plates with the height of 500-1200 mm are arranged on the left side and the right side inside the oil-water separators (48), (55) and (88), the distance between the partition plates is 500-1200 mm, and the insides of the oil-water separators (48), (55) and (88) are divided into a left water area, a middle cache area and a right VOCs storage area; the left water areas of the oil-water separators (48) and (55) are connected with a buffer water tank (56), the opening and closing of the buffer water tank are controlled by gate valves (51) and (54), the length of the buffer water tank is 800-1500 mm, and the diameter of the buffer water tank is 500-1000 mm; the oil-water separators (48) and (55) and the buffer water tank (56) are integrally provided with heat insulation layers, and the thickness of each heat insulation layer is 100-300 mm.
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