CN102911703A - Oil-gas recovery method - Google Patents

Abstract

The invention relates to an oil-gas recovery method, and belongs to the technical field of environment protection and energy-saving. An oil-gas recovery comprises an underground oil tank, an induced draft pump, an adsorption tank, a vacuum pump and a condensate separation tank, and further comprises a finned tube type air-cooled condenser, and the finned tube type air-cooled condenser is connected between the vacuum pump and the condensate separation tank. According to the invention, by adopting the technology of cooling after absorption, most air in oil-gas is filtered and discharged into the air after absorption, and the refrigerating capacity required by condensed and desorbed high-concentration hydrocarbon steam than that of the directly condensed mixed gas of oil-gas and air is greatly reduced; and we adopt the technology that the air-cooled condenser is directly used to substitute the conventional refrigerating unit structure of a compressor, a condenser, an expansion valve and an evaporator, in this way, the manufacturing and operating costs of the entire cooling section are greatly reduced.

Description

Oil-gas recovery method

Technical field

The invention belongs to environment protection and field of energy-saving technology, especially relate to a kind of oil gas reclaiming device for gas station and method thereof.

Background technology

Owing to being very easy to volatilization, the various volatile organic matters (VOCs) such as gasoline produce very serious vapour loss, so the service station is easy to abrim " oil flavor ".The a large amount of evaporations of these oil gas also directly are discharged in the atmosphere, not only cause serious quantity loss and Quality Down, and have seriously polluted atmospheric environment and stayed great disaster hidden-trouble.Therefore the service station must carry out the oil gas recovery.

Gas station oil gas reclaims and to be divided into one-level gas recovery system for oil and secondary gas recovery system for oil: method and apparatus from tank wagon to service station's tank unloading process that collect oil gas from is called the one-level gas recovery system for oil, and the oil gas of recovery is transported to oil depot or refinery concentrates, absorption or burning disposal through tank wagon; The secondary gas recovery system for oil is to be with the method and apparatus of oil gas collection in service station's storage tank of volatilization in the service station in the automobile fuel filler process.But the two-stage gas recovery system for oil is owing to the vapor liquid equilibrium of not accomplishing " to extract one liter of oil out and just refill one liter of gas " from volume, so can not effectively prevent exhaust of oil, therefore country to have formulated standard No. be the GB20592-2007 standard, force to carry out installing device for recovering oil and gas in the service station, be so-called No. three recovery systems, and determined storage tank farm, gasoline station oil gas discharge control criterion enforcement zone and time, and exhaust of oil limit value.

At present, the separation and recovery method of oil gas and air has absorption process, absorption method, condensation method and membrane separation process etc.What be applied to the service station mainly is condensation method, absorption method and membrane separation process, but this is several all not ideal enough aspect economic target and technical feature, comparatively speaking, the higher running cost of its power is high, the partially complicated manufacturing cost of technique is higher, more can only embody its environmental benefit, economic benefit is not obvious.

Summary of the invention

For the defective that the above-mentioned background technology exists, the technical problem to be solved in the present invention provides that a kind of exhaust of oil is up to standard, easy handling, lower-cost device for recovering oil and gas and method.

For solving the problems of the technologies described above, the present invention is achieved by the following technical programs:

A kind of device for recovering oil and gas, comprise underground petrol tank, air inducing pump, adsorption tanks, vacuum pump, phlegma separating tank, described device for recovering oil and gas comprises the fin tube type air-cooled condenser, and described fin tube type air-cooled condenser is connected between described vacuum pump and the phlegma separating tank.

Use the oil-gas recovery method of said apparatus, comprising:

(1) when the pressure of underground oil tank reaches set(ting)value, the bleed pump is started working, and the oil gas in the suction underground petrol tank enters adsorption tanks;

(2) oil gas enters adsorption tanks, utilizes the agent of adsorption tanks internal adsorption to the effect of the avidity of hydrocarbon molecule, and with oil gas and air separation, gas discharging directly into atmosphere up to standard when adsorption tanks adsorb when saturated, utilizes vacuum pump that the saturated adsorption tank is carried out the vacuum desorption regenerative operation;

(3) desorption high concentration of hydrocarbon steam out enters the fin tube type air-cooled condenser, and in the fin tube type air-cooled condenser, the hydrocarbon vapor portion is cooled into liquid state and enters in the phlegma separating tank, and all the other high concentrations of gas return underground petrol tank.

The technique of rear cooling is adsorbed first in utilization of the present invention, because after absorption, most air in the oil gas enter atmosphere after filtration, the high concentration of hydrocarbon vapor phase of condensation solution sucking-off has substantial degradation than the refrigerating duty that direct condensed oil-gas air Mixture needs, the technique that we adopt is the structure that directly replaces former compressor, condenser, expansion valve, the such unit cooler of vaporizer with an air-cooled condenser, and the manufacturing cost of whole like this cooling section and running cost have greatly reduction.

Further improve as the present invention, described adsorption tanks are the adsorption tanks of two alternations.For absorbing process, adsorption process and desorption process can not carry out simultaneously in the same adsorption tanks, and the adsorptive capacity of adsorption tanks is limited, must carry out desorption process when absorption is saturated, will exceed standard otherwise discharge tail gas.Adopt the technique of two adsorption tanks, when an adsorption tanks absorption was saturated, device can automatically switch to another adsorption tanks to be continued absorption and starts simultaneously vacuum pump the saturated adsorption tank is carried out regenerative operation.The adsorption/desorption assurance device can continually move thereby such two adsorption tanks just can hocket.

Description of drawings

Accompanying drawing is device for recovering oil and gas schematic diagram of the present invention.

Embodiment

Below in conjunction with accompanying drawing the present invention is made and to further specify.

Whole oil-gas recovery method can be divided into: oil gas collection → adsorption filtration → cooling is reclaimed.Be specially three phases:

(1) when the pressure of underground oil tank 1 reaches set(ting)value, bleed pump 2 is started working, and the oil gas in the suction underground petrol tank 1 enters adsorption tanks 3 or 4;

(2) oil gas enters adsorption tanks 3 or 4, utilize the agent of adsorption tanks internal adsorption to the effect of the avidity of hydrocarbon molecule, with oil gas and air separation, gas after the adsorption treatment is emptying front through thief hole 5 sample examinations, gas up to standard is by evacuated tube 6 discharging directly into atmosphere, when one of them adsorption tanks adsorbs when saturated, utilize 7 pairs of saturated adsorption tanks of vacuum pump to carry out the vacuum desorption regenerative operation;

(3) the high concentration of hydrocarbon steam that desorbs enters fin tube type air-cooled condenser 8, and in fin tube type air-cooled condenser 8, the hydrocarbon vapor portion is cooled into liquid state and enters in the phlegma separating tank 9, and all the other high concentrations of gas return underground petrol tank 1.

With respect to traditional condensation method, membrane separation process and absorption method, adopt the advantage of this technique to be:

(1) adsorption tanks of two alternations of employing, when adsorption tanks adsorb when saturated, can automatically switch to another adsorption tanks and continue absorption, thereby assurance device can 24 hours incessantly operation, thereby having avoided single adsorption tanks to adsorb must shutting down when saturated carries out the desorb operation otherwise discharging situation not up to standard;

(2) adopt the mode of cooling off afterwards of adsorbing first, the process for cooling section is used for processing the high concentration of hydrocarbon steam of separating sucking-off, thereby greatly reduced the refrigerating duty that direct condensation needs, thereby cooling section does not re-use the structure of traditional compressor, condenser, throttling valve, vaporizer, and directly adopt the mode of an air-cooled condenser, greatly saved manufacturing cost and running cost;

(3) adopt the major path saw tooth fin, defrosting time is shortened to original 1/3, adopt displacement evaporation fin, heat exchange efficiency has improved 30% in the situation of equal volume condenser size;

(4) oil gas recovery rate can reach 98%, and concentration of oil and gas discharged is less than 5g/m ³, be better than the emission standard of national regulation;

(5) process structure is simple, easy handling, and cost is lower, and service rating about 1KW, is the part of other combination procesies only only, has obvious economic benefit and social benefit.

The description of above embodiment is comparatively concrete, detailed; but can not therefore be interpreted as the restriction to this patent scope; should be noted that; for the person of ordinary skill of the art; without departing from the inventive concept of the premise; can also make some distortion and improvement, these all belong to protection scope of the present invention.

Claims (1)

1. an oil-gas recovery method is characterized in that comprising the steps:

(1) when the pressure of underground oil tank reaches set(ting)value, the bleed pump is started working, and the oil gas in the suction underground petrol tank enters adsorption tanks;

(2) oil gas enters adsorption tanks, utilizes the agent of adsorption tanks internal adsorption to the effect of the avidity of hydrocarbon molecule, and with oil gas and air separation, gas discharging directly into atmosphere up to standard when adsorption tanks adsorb when saturated, utilizes vacuum pump that the saturated adsorption tank is carried out the vacuum desorption regenerative operation;

(3) desorption high concentration of hydrocarbon steam out enters the fin tube type air-cooled condenser, and in the fin tube type air-cooled condenser, the hydrocarbon vapor portion is cooled into liquid state and enters in the phlegma separating tank, and all the other high concentrations of gas return underground petrol tank.

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