Oil gas recovery device for oil loading and unloading vehicle and tank field

Abstract

The utility model relates to the technical field of oil gas recovery, and discloses an oil gas recovery device for an oil product loading and unloading vehicle and a tank field, which comprises a compression and condensation unit, a gas recovery unit and a gas recovery unit, the adsorption and desorption unit comprises a plurality of adsorption tanks and is used for adsorbing organic matters in the oil gas through activated carbon and recovering high-concentration organic matters through vacuum desorption; the low-temperature absorption unit is used for removing organic matter components in the desorption gas; and the control system is used for controlling the operation of each unit and acquiring the operation data of the device in real time for analysis and processing. By adopting the technical scheme of combining compression condensation and gas-liquid separation, the oil gas is subjected to effective primary treatment through the compressor and the condenser, the liquid-phase component in the oil gas is separated and recycled, and the technical effect of reducing the treatment load of a subsequent adsorption and desorption unit is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to oil gas recovery technical field, concretely is a kind of oil gas recovery device for oil loading and unloading vehicle and tank area. BACKGROUND

[0002] Organic chemical products, especially the oil gas (VOCs) volatilized in the loading and unloading and storage process of petrochemical products, conventional absorption method, adsorption method, membrane separation method and condensation method and its combination processing technology are difficult to realize sustained and stable discharge, biological method, photocatalytic oxidation method, low temperature plasma method is very immature in technology, destruction method, typical such as catalytic combustion and high-temperature combustion, there are generally problems such as large equipment investment, high operating cost and poor complete performance, and condensation method is mainly based on the characteristics of organic gas, through the drop of gas temperature, organic steam appears supersaturation, then liquefies, recycles.Oil gas can be effectively treated basically by condensation method, but condensation method has high energy consumption, high equipment failure rate, and cannot be used for the treatment of low-concentration or light-component waste gas.

[0003] Traditional adsorption method mainly uses activated carbon to adsorb organic components in oil gas, and the adsorbent is regenerated by high-temperature desorption or nitrogen purging. Although the adsorption efficiency is high, high-temperature desorption will cause irreversible damage to the pore channel of activated carbon, and the service life of the adsorbent is significantly shortened. Frequent replacement of adsorbent not only increases the operating cost, but also reduces the economy of the equipment.

[0004] Condensation method recovers oil gas by reducing its temperature, but the separate condensation method has limited treatment effect on oil gas with low gas component concentration, and there are still many unrecycled organic matters in tail gas, which cannot meet the strict emission requirements. INVENTION CONTENTS

[0005] In view of the deficiencies of the prior art, the utility model provides an oil gas recovery device for oil loading and unloading vehicle and tank area, which solves the problems of traditional adsorption method, which mainly uses activated carbon to adsorb organic components in oil gas, and regenerates the adsorbent by high-temperature desorption or nitrogen purging. Although the adsorption efficiency is high, high-temperature desorption will cause irreversible damage to the pore channel of activated carbon, and the service life of the adsorbent is significantly shortened. The problems of large amount of ordinary absorption method adsorbent and low absorption efficiency are solved.

[0006] To achieve the above purpose, the utility model realizes the following technical scheme: an oil gas recovery device for oil loading and unloading vehicle and tank area, comprising:

[0007] A compression condensing unit is used to compress and condense the oil gas generated during the loading process to recover part of the organic matter;

[0008] An adsorption desorption unit is used to adsorb the organic matter in the oil gas by activated carbon and to recover high-concentration organic matter by vacuum desorption.

[0009] A low-temperature absorption unit is used to remove the organic component in the desorption gas.

[0010] A control system is used to control the operation of the above-mentioned units and to collect the operation data of the device in real time for analysis and processing.

[0011] Preferably, the compression condensing unit comprises a compressor, a condenser and a gas-liquid separator, the inlet of the compressor is connected to the gas tank, the outlet is connected to the inlet of the condenser, the outlet of the condenser is connected to the gas-liquid separator through a pipeline, and the gas-liquid separator is used to separate the condensed oil gas mixture, wherein the liquid part is transported to the tank area by the production pump, and the gas part enters the adsorption desorption unit.

[0012] Preferably, the adsorption desorption unit comprises a plurality of adsorption tanks and a vacuum pump, the gas phase inlet at the bottom of the adsorption tank is connected to the gas phase outlet at the top of the gas-liquid separator, the gas phase outlet at the top of the adsorption tank is connected to the chimney, the nitrogen gas inlet at the top is connected to the nitrogen gas pipeline for supplementing nitrogen during desorption, the desorption outlet at the bottom is connected to the inlet of the vacuum pump, and the outlet of the vacuum pump is connected to the subsequent low-temperature absorption unit.

[0013] Preferably, the low-temperature absorption unit comprises an absorption tower, a heat exchanger, a refrigerator and a rich oil production pump, the gas phase inlet at the bottom of the absorption tower is connected to the outlet of the vacuum pump, the gas phase outlet at the top is connected to the inlet of the compressor, the liquid phase inlet at the top of the absorption tower is connected to the outlet of the heat exchanger, the inlet of the heat exchanger is connected to the gasoline tank area, the liquid phase outlet at the bottom of the absorption tower is connected to the inlet of the rich oil production pump, and the outlet of the rich oil production pump is connected to the tank area.

[0014] The oil gas recovery device for oil loading and unloading and tank area has the following beneficial effects:

[0015] 1、The technical scheme of the present application combines compression condensation and gas-liquid separation, and effectively preliminary processes the oil gas through the compressor and the condenser to separate and recover the liquid phase component in the oil gas, thereby reducing the processing load of the subsequent adsorption desorption unit.

[0016] 2、The utility model discloses a combination of multi-adsorption tank series connection and vacuum desorption technology, through three adsorption tanks alternately adsorbing and desorbing operation, ensure that the system continuous high -efficient operation, reached the technical effect of high -efficient recovery oil gas organic component. Compared with prior art single -stage adsorption and hot nitrogen desorption big technical scheme of adsorbent loss, solved the equipment energy consumption high, adsorption effect is poor, adsorbent frequent replacement's insufficient, effectively reduced the operation cost and prolonged the service life of adsorbent.

[0017] 3、The utility model discloses a combination of multi-adsorption tank series connection and vacuum desorption technology, through three adsorption tanks alternately adsorbing and desorbing operation, ensure that the system continuous high -efficient operation, reached the technical effect of high -efficient recovery oil gas organic component. Compared with prior art single -stage adsorption and hot nitrogen desorption big technical scheme of adsorbent loss, solved the equipment energy consumption high, adsorption effect is poor, adsorbent frequent replacement's insufficient, effectively reduced the operation cost and prolonged the service life of adsorbent. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 For the system complete framework of the utility model;

[0019] Figure 2 For the system flow chart of the utility model. DETAILED DESCRIPTION

[0020] The technical scheme in the embodiments of the utility model will be described clearly and completely in conjunction with the drawings of the utility model specification, obviously, the described embodiments only are a part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the ordinary skill in the art without making creative labor are within the scope of the utility model protection.

[0021] Please refer to the drawings of the utility model Figure 1 - the drawings of the utility model Figure 2 The utility model embodiment provides a kind of oil gas recovery device for oil loading and unloading truck and tank area, comprising:

[0022] Compressed condensing unit is used to condense and recover part of organic matter by compressing oil gas generated in loading process;

[0023] Adsorption and desorption unit includes multiple adsorption tanks, for recovering high concentration organic matter by active carbon adsorbing organic matter in oil gas;

[0024] Low-temperature absorption unit is used to remove organic components in desorption gas;

[0025] Control system is used to control the operation of each unit, and real-time acquisition device operation data is analyzed and processed.

[0026] The compression condensing unit comprises a compressor, a condenser and a gas-liquid separator, the inlet of the compressor is connected to the buffer tank, the outlet is connected to the inlet of the condenser, the outlet of the condenser is connected to the gas-liquid separator through a pipeline, and the gas-liquid separator is used to separate the condensed oil-gas mixture, wherein the liquid part is transported to the tank area by the production pump, and the gas part enters the adsorption desorption unit.

[0027] The adsorption desorption unit comprises a plurality of adsorption tanks and a vacuum pump, the bottom gas phase inlet of the adsorption tank is connected to the top gas phase outlet of the gas-liquid separator, the top gas phase outlet of the adsorption tank is connected to a chimney, the top nitrogen inlet is connected to a nitrogen pipeline for supplementing nitrogen during desorption, the bottom desorption outlet is connected to the inlet of the vacuum pump, and the outlet of the vacuum pump is connected to the subsequent low-temperature absorption unit.

[0028] The low-temperature absorption unit comprises an absorption tower, a heat exchanger, a refrigerator and a rich oil production pump, the bottom gas phase inlet of the absorption tower is connected to the outlet of the vacuum pump, the top gas phase outlet is connected to the inlet of the compressor, the top liquid phase inlet of the absorption tower is connected to the outlet of the heat exchanger, the inlet of the heat exchanger is connected to the gasoline tank area, the liquid phase outlet of the tower kettle of the absorption tower is connected to the inlet of the rich oil production pump, and the outlet of the rich oil production pump is connected to the tank area.

[0029] Specifically, S1. Oil-gas compression and condensation: the oil-gas generated by loading is pressurized to about 0.3 MPa by the compressor, the intermolecular interaction force is improved by pressurization, thereby improving the subsequent condensation and adsorption effect, effectively recovering the liquid organic components while reducing the subsequent treatment load, and the high-temperature oil-gas is introduced into the condenser after pressurization, cooled to about 0-10℃, and then introduced into the gas-liquid separator, the separated liquid phase is pumped out to the tank area by the production pump, and the separated gas phase is introduced into the subsequent adsorption and desorption unit; S2. Pressurized adsorption: the non-condensable gas is introduced into the adsorption unit, the adsorption tank is operated under pressure, the high-efficiency adsorption characteristics of activated carbon are used to capture and treat the organic matter in the oil-gas, and through the design of a plurality of adsorption tanks in series, the non-methane total hydrocarbon concentration in the tail gas is maintained to be less than 60 mg / m 3, meet the national emission standards, the series operation of the adsorption unit not only improves the adsorption efficiency and ensures the adsorption effect, but also avoids the excessive saturation of the adsorbent by optimizing the switching operation;S3. Vacuum desorption, the adsorption tank saturated with adsorption is subjected to vacuum desorption to recover high-concentration organic matter, the vacuum desorption includes three steps of vacuum pumping, vacuum cleaning and vacuum breaking, wherein the vacuum pumping reduces the pressure in the adsorption tank through a vacuum pump, and after the pressure is reduced to about 5kPa(a), the organic matter in the adsorbent is gradually desorbed, the vacuum cleaning further reduces the oil and gas partial pressure by using a small amount of nitrogen to completely regenerate the adsorbent, and the vacuum breaking gradually restores the system to the normal pressure state by controlling the air pressure, which not only improves the desorption efficiency, but also significantly prolongs the service life of the adsorbent;S4. Low-temperature absorption, the desorption gas is introduced into a low-temperature absorption unit to absorb the organic components therein, and after the absorbent is reduced to about -10 to 0 DEG C through a heat exchanger, it is introduced into the liquid phase inlet of the absorption tower top, and the organic matter in the desorption tail gas is efficiently absorbed by the cooled absorbent to avoid the circulation and accumulation of organic matter in the system, which leads to the emission of the device outlet tail gas exceeding the standard, and a small amount of non-condensed gas remaining in the absorption tower top is returned to the compressor inlet for treatment again, and the setting of the absorbent as gasoline and other efficient absorption solvents realizes the recycling of resources, reduces the amount of absorbent and equipment investment. The whole method can dynamically adjust the operating parameters under the real-time monitoring of the control system, such as the compressor pressure, the adsorption tank pressure and the desorption gas concentration, to ensure that the system is in efficient operation while realizing the automation and intelligent management of the whole process, and to generate operation reports to guide equipment maintenance and optimize operation. Compared with the prior art, the utility model avoids the problems of low oil and gas recovery efficiency, high equipment energy consumption and incomplete resource utilization by accurately controlling the operating conditions of each unit, and realizes the significant technical effects of low energy consumption, high recovery rate and resource utilization. All steps of the method can be operated at room temperature, which not only reduces the complexity and operating cost of the equipment, but also effectively reduces the system energy consumption, thereby further improving the economy and environmental friendliness of the method.

[0030] Working principle, adopt compression condensation plus pressurized adsorption plus vacuum desorption plus low temperature absorption. First, the oil gas generated by the vehicle is pressurized by the compressor and introduced into the condenser, the condensation can eliminate the heat generated by gas compression, and can recover part of the organic matter, reduce the load of the subsequent adsorption unit, improve the adsorption efficiency, and prevent the over-temperature phenomenon caused by adsorption heat release, the condensate generated by condensation is pumped out to the tank area by the production pump, and the non-condensed gas after condensation is introduced into the subsequent adsorption and desorption unit.

[0031] The adsorption unit is provided with three adsorption tanks, which are operated in series, two of which are used for adsorption and one of which is used for desorption, and the adsorption tank is switched back to the adsorption state after completing the desorption, thereby completing a cycle. After the tail gas enters the adsorption tank, the C2, C3, C4 and above organic matters therein are adsorbed by the activated carbon, and the separated gas is discharged through the chimney after being reduced to the required pressure.

[0032] The adsorption bed regeneration operation includes three steps, a vacuum extraction step, a vacuum cleaning step and a vacuum breaking step.

[0033] The vacuum extraction step is to extract the adsorption bed by a vacuum pump. As the vacuum extraction pressure decreases, the organic matter adsorbed on the adsorbent gradually begins to be desorbed. The desorption gas with high organic matter concentration discharged from the vacuum pump outlet is introduced into the subsequent low-temperature absorption unit.

[0034] The vacuum cleaning step is to introduce a small amount of nitrogen by opening the cleaning gas valve on the outlet side of the adsorption bed while the vacuum pump continues to extract the adsorption bed, thereby further desorbing the organic matter adsorbed on the adsorbent by reducing the partial pressure of oil gas. The desorption gas obtained in the vacuum cleaning step and the desorption gas obtained in the second extraction step undergo the same process. After the vacuum cleaning step, the adsorption bed is completely regenerated.

[0035] The vacuum breaking step is to open the cleaning vacuum breaking valve on the outlet side of the adsorption bed, and gradually break the vacuum of the adsorption bed to atmospheric pressure with air or nitrogen under the control of the vacuum breaking valve.

[0036] At this point, an adsorption bed completes one adsorption cycle and enters the next adsorption cycle.

[0037] The purpose of the low-temperature absorption unit is to remove the organic components in the desorption gas. The high-concentration tail gas desorbed from the adsorption tank is introduced into the bottom inlet of the absorption tower. A heat exchanger is arranged in the gasoline feed pipeline to cool the absorbent and improve the absorption efficiency. The low-temperature absorbent is transported to the top of the absorption tower to absorb the hydrocarbon components and other chemically active substances in the oil gas from top to bottom. The absorbed oil is pumped back to the storage tank by the rich oil pump, and the gas phase at the top of the tower is returned to the inlet of the device.

[0038] Through the above design, the present application realizes efficient separation and recovery of organic matter in oil gas, not only reduces the energy consumption of the system, optimizes the working efficiency of the device, significantly improves the operation efficiency and economy of the whole device. Compared with the prior art, the present application effectively makes up for the limitations of single condensation or adsorption treatment technology. The pressurized condition greatly improves the processing efficiency of the condensation and adsorption unit, and the low-temperature absorption of the desorption gas avoids the circulation and accumulation of light components in the system, solves the problems of high energy consumption and low resource utilization rate in the oil gas recovery process, and significantly improves the overall performance and service life of the device.

[0039] Although embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. An oil vapor recovery device for loading and unloading of oil products and tank farms, characterized in that, The application relates to a device for recovering organic substances from oil gas produced during loading. The device comprises a compression-condensation unit for compressing and condensing the oil gas produced during loading to recover part of the organic substances; an adsorption-desorption unit comprising multiple adsorption tanks for adsorbing the organic substances in the oil gas by activated carbon and recovering high-concentration organic substances by vacuum desorption; a low-temperature absorption unit for removing organic components in the desorption gas; and a control system for controlling the operation of the units and collecting real-time operation data of the device for analysis and processing. The compression-condensation unit comprises a compressor, a condenser and a gas-liquid separator, the inlet of the compressor is connected to a buffer tank, the outlet is connected to the inlet of the condenser, the outlet of the condenser is connected to the gas-liquid separator through a pipeline, the gas-liquid separator is used for separating the oil gas mixture after condensation, the liquid part is transported to a tank area by a production pump, and the gas part enters the adsorption-desorption unit. The adsorption-desorption unit comprises multiple adsorption tanks and a vacuum pump, the gas-phase inlet at the bottom of the adsorption tank is connected to the gas-phase outlet at the top of the gas-liquid separator, the gas-phase outlet at the top of the adsorption tank is connected to a chimney, the nitrogen gas inlet at the top is connected to a nitrogen gas pipeline for supplementing nitrogen gas during desorption, the desorption outlet at the bottom is connected to the inlet of the vacuum pump, and the outlet of the vacuum pump is connected to the subsequent low-temperature absorption unit. The low-temperature absorption unit comprises an absorption tower, a heat exchanger, a refrigerator and a rich-oil production pump, the gas-phase inlet at the bottom of the absorption tower is connected to the outlet of the vacuum pump, the gas-phase outlet at the top is connected to the inlet of the compressor, the liquid-phase inlet at the top of the absorption tower is connected to the outlet of the heat exchanger, the inlet of the heat exchanger is connected to a gasoline tank area, the liquid-phase outlet at the bottom of the absorption tower is connected to the inlet of the rich-oil production pump, and the outlet of the rich-oil production pump is connected to the tank area. ​ 2. The oil vapor recovery device for loading and unloading vehicle and tank area according to claim 1, characterized in that, ​ 3. The oil vapor recovery device for loading and unloading vehicle and tank area according to claim 1, characterized in that, ​

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