CN214325992U - Combustible liquid oil gas recovery system - Google Patents

Abstract

The utility model provides a combustible liquid vapor recovery system, including interior floating roof jar and water adsorption tank, be provided with urgent pressure release manhole on the interior floating roof jar, nitrogen gas inlet pipeline, the vapor recovery pipeline, jar line and medium play jar line are advanced to the medium, the one end that the interior floating roof jar was kept away from to the vapor recovery pipeline is linked together with the water adsorption tank, be provided with fresh water inlet pipeline and sump oil on the water adsorption tank and transship into the pump line, sump oil is transshipped into in the pump line one end stretches into the water adsorption tank, the other end is linked together with the input of self priming pump, the output of self priming pump is connected with sump oil and is transships the pump line and is used for its mechanical pump drainage line of condensing, the one end and the water adsorption tank that self priming pump was kept away from to the pump drainage line are to the intercommunication. The utility model discloses water adsorption tank buries underground, adsorbs inner floating roof jar exhaust oil gas through pouring into proper amount fresh water into in the water adsorption tank, and this kind of absorption mode saves and takes up an area of, more energy-conservation, and the production operation is more safe moreover, and the one-time investment is low, and the effect is also better.

Description

Combustible liquid oil gas recovery system

Technical Field

The utility model belongs to petrochemical oil transportation field, in particular to combustible liquid vapor recovery system.

Background

According to the notice of 'comprehensive volatile organic compound regulation scheme in petrochemical industry' issued by environmental protection department file [ 2014 ] 177, process waste gas with recovery value, storage tank breathing gas and loading and unloading waste gas are recycled. Emission standards for pollutants in the petroleum refining industry (G B31570-2015) and emission standards for pollutants in the petrochemical industry (GB31571-2015) were published by the department of environmental protection in China at 4/16/2015. At present, the oil gas recovery method mainly comprises a membrane separation method, an activated carbon adsorption method, a condensation method, a solvent absorption method and a combined process method, and various oil gas recovery technologies have different working principles and have advantages and disadvantages. The membrane separation method has the disadvantages that the membrane separation device requires steady flow and steady pressure gas; the adsorption method has the defects that the secondary pollution problem exists after the activated carbon is inactivated, the adsorption capacity of domestic activated carbon is only about 7 percent generally, and the service life is short; the absorption method has the disadvantages of large occupied space of equipment, high energy consumption, large consumption of absorbent and continuous supplement; the condensing method has the disadvantages of large investment in the early stage and high refrigeration energy consumption. The utility model discloses a meaning lies in solving the shortcoming regret in these aspects, and adsorption effect is good, operation energy consumption greatly reduced.

Disclosure of Invention

In order to overcome the current not enough, the utility model aims to provide a to volatile, can dissolve in water combustible liquid oil gas adsorption effect good and operation energy consumption greatly reduced's oil gas recovery system.

The utility model aims at adopting the following technical scheme to realize. According to the combustible liquid oil gas recovery system provided by the utility model,

the device comprises an inner floating roof tank and a water adsorption tank, wherein an emergency pressure relief manhole, a nitrogen inlet pipeline, an oil gas recovery pipeline, a medium inlet tank line and a medium outlet tank line are arranged on the inner floating roof tank, one end, away from the inner floating roof tank, of the oil gas recovery pipeline with a nitrogen sealing valve is arranged on the nitrogen inlet pipeline and is communicated with the water adsorption tank through a pump discharge condensation line, and a single-breathing valve and a flame arrester are sequentially arranged on the oil gas recovery pipeline in the direction from the inner floating roof tank to the water adsorption tank; thereby be provided with on the water adsorption tank and be used for carrying into the water adsorption tank fresh water inlet pipeline and sump oil that adsorb to the oil gas that gets into in the water adsorption tank from the internal floating roof jar, sump oil is transported into pump line one end and is stretched into inside the water adsorption tank and this tip and be provided with the bottom valve, the sump oil is transported into the pump line other end and is linked together with the input of self priming pump, the output of self priming pump is connected with sump oil and is transported out the pump line and be used for the pump drainage line of condensing its row, the one end that self priming pump was kept away from to the pump drainage line is linked together with the water adsorption tank.

Furthermore, the top of the inner floating roof tank is also provided with a breather valve.

Furthermore, a bypass is arranged on the nitrogen inlet pipeline, and a flow-limiting pore plate is arranged on the bypass.

Borrow by above-mentioned technical scheme, the utility model has the advantages that: the water adsorption tank is buried underground, and the oil gas discharged from the inner floating roof tank is adsorbed by injecting a proper amount of fresh water into the water adsorption tank, so that the adsorption mode saves occupied space, is more energy-saving, is safer in production and operation, is low in one-time investment and has better effect.

The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented according to the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more obvious and understandable, the following preferred embodiments are described in detail with reference to the accompanying drawings.

Drawings

Fig. 1 is a schematic structural diagram of the combustible liquid oil-gas recovery system of the present invention.

[ reference numerals ]

1-inner floating roof tank, 2-emergency pressure relief manhole, 3-single exhalation valve, 4-flame arrester, 5-nitrogen sealing valve, 6-nitrogen inlet pipeline, 7-high liquid level interlocking cut-off tank inlet valve, 8-medium inlet pipeline, 9-low liquid level interlocking cut-off tank outlet valve, 10-medium outlet pipeline, 11-water adsorption tank, 12-bottom valve, 13-fresh water inlet pipeline, 14-machine pump drainage line, 15-dirty oil transfer pump inlet line, 16-self-priming pump, 17-careless transfer pump outlet line, 18-oil gas recovery pipeline, and 19-flow limiting orifice plate.

Detailed Description

To further illustrate the technical means and effects of the present invention for achieving the objects of the present invention, the following detailed description will be given with reference to the accompanying drawings and preferred embodiments of a flammable liquid vapor recovery system according to the present invention, and its specific embodiments, structures, features and effects.

Referring to fig. 1, a combustible liquid oil gas recovery system includes an inner floating roof tank 1 for storing liquid oil gas, the top of the inner floating roof tank 1 is provided with a nitrogen inlet pipeline 6, an oil gas recovery pipeline 18, a medium inlet pipeline 8, a medium outlet pipeline 10, a breather valve, and a pressure control regulating valve, the medium inlet pipeline 8 is provided with a high-high liquid level interlocking cut-off inlet valve 7, acetaldehyde, methyl formate, ethylamine, diethylamine, acetone, methyl ethyl ketone, methanol, isopropanol, ethanol, propanol, pyridine, and other volatile oil gas dissolved in water combustible liquid enters the inner floating roof tank 1 through the medium inlet pipeline 8, the medium outlet pipeline 10 of the medium outlet pipeline 10 for discharging is provided with a low-low liquid level interlocking cut-off outlet valve 9, and the medium outlet pipeline 10 is provided with a low-high liquid level interlocking cut-off outlet valve 9.

One end of a nitrogen inlet pipeline 6 is communicated with the inner floating roof tank 1, the other end of the nitrogen inlet pipeline 6 is communicated with a nitrogen generating device, and a nitrogen sealing valve 5 which regulates nitrogen to enter the inner floating roof tank 1 by controlling the nitrogen through pressure is arranged on the nitrogen inlet pipeline 6; the nitrogen inlet pipeline 6 is provided with a bypass, two ends of the bypass are respectively communicated with the inlet end and the outlet end of the nitrogen sealing valve 5, the bypass is also provided with a flow limiting pore plate 19, when the nitrogen sealing valve 5 fails, the flow limiting pore plate 19 is manually opened to prevent the nitrogen sealing valve 5 from being damaged, and the inner floating roof tank 1 is kept in a pressure stabilizing state; one end of an oil gas recovery pipeline 18 is communicated with the inner floating roof tank 1, the other end of the oil gas recovery pipeline is communicated with the water adsorption tank 11 through a pump drainage condensation line 14, the oil gas recovery pipeline 18 is sequentially provided with a single-breath valve 5 and a flame arrester 4 from the inner floating roof tank 1 to the water adsorption tank 11, the single-breath valve 3 is opened when the pressure in the inner floating roof tank 1 is greater than 0.68kpa, the top of the inner floating roof tank 1 is also provided with an emergency pressure-relief manhole 2 and a breather valve, the breather valve is opened when the pressure in the inner floating roof tank 1 is lower than-0.15 kpa or higher than 1.02kpa, and the emergency pressure-relief manhole 2 is opened to keep the pressure in the tank balanced when the pressure in the inner floating roof tank 1 is lower than-0.2 kpa or higher than 1.35 kpa; the emergency pressure relief manhole 2 and the breather valve are used for ensuring the safety of the inner floating roof tank 1 under special conditions. The nitrogen seal pressure of the inner floating roof tank 1 is 0.3kpa, the nitrogen seal valve 5 is opened when the pressure in the inner floating roof tank 1 is lower than the nitrogen seal pressure under normal conditions, nitrogen enters the inner floating roof tank 1 to maintain the pressure in the tank, the valve 3 is singly exhaled when the pressure in the inner floating roof tank 1 is higher than the opening pressure set by the valve 3, and oil gas enters the water adsorption tank 11 through the oil gas recovery pipeline 18 after the valve 3 is singly exhaled.

The water adsorption tank 11 is usually set as a buried adsorption tank which can save space, a fresh water inlet pipeline 13 is arranged at the top of the water adsorption tank 11, a switch valve for controlling the opening and closing state of the fresh water inlet pipeline 13 is also arranged on the fresh water inlet pipeline 13, fresh water enters the water adsorption tank 11 through the fresh water inlet pipeline 13 to adsorb oil gas in the water adsorption tank, and the adsorption mode of adsorbing the oil gas through the fresh water has low one-time investment, good effect, more energy conservation and safety; an oil stain transfer and feed pump line 15 is further arranged in the water adsorption tank 11, one end of the oil stain transfer and feed pump line 15 is communicated with the input end of the self-sucking pump 16, the other end of the oil stain transfer and feed pump line extends into the water inlet adsorption tank 11, the end part of one end, extending into the water inlet adsorption tank 11, of the oil stain transfer and feed pump line 15 is further provided with a bottom valve 12, the bottom valve 12 has non-return and filtering functions, the pipeline at the input end of the self-sucking pump 16 can be guaranteed to be filled with liquid, and the self-sucking pump is prevented from being corroded by steam; the output end of the self-sucking pump 16 is provided with a pump discharging and condensing line 14 and an oil stain transferring and outputting pump line 17, one end of the pump discharging and condensing line 14 is communicated with the output end of the self-sucking pump 11, and the other end of the pump discharging and condensing line is communicated with the water absorption tank 11 and is used for discharging and condensing the output end of the self-sucking pump 11 during maintenance; fresh water absorbed with oil gas in the water absorption tank 11 enters the self-sucking pump 16 through the oil stain transfer pump line 15 under the action of the self-sucking pump 16 and then is transferred to a specific oil sewage treatment device through the oil stain transfer pump line 17.

And the pump drainage and condensation line 14, the oil stain transfer and input pump line 15, the first branch and the fresh water inlet pipeline 13 are all provided with switch valves for controlling the opening and closing states of pipelines.

The above description is only a preferred embodiment of the present invention, and any person skilled in the art can easily modify, change or modify the above embodiments according to the technical spirit of the present invention without departing from the scope of the present invention.

Claims (3)

1. The combustible liquid oil-gas recovery system is characterized in that: the device comprises an inner floating roof tank and a water adsorption tank, wherein an emergency pressure relief manhole, a nitrogen inlet pipeline, an oil gas recovery pipeline, a medium tank inlet line and a medium tank outlet line are arranged on the inner floating roof tank; thereby be provided with on the water adsorption tank and be used for carrying into the water adsorption tank fresh water inlet pipeline and sump oil that adsorb to the oil gas that gets into in the water adsorption tank from the internal floating roof jar, sump oil is transported into pump line one end and is stretched into inside the water adsorption tank and this tip and be provided with the bottom valve, the sump oil is transported into the pump line other end and is linked together with the input of self priming pump, the output of self priming pump is connected with sump oil and is transported out the pump line and be used for the pump drainage line of condensing its row, the one end that self priming pump was kept away from to the pump drainage line is linked together with the water adsorption tank.

2. The combustible liquid oil and gas recovery system according to claim 1, wherein: the top of the inner floating roof tank is also provided with a breather valve.

3. The combustible liquid oil and gas recovery system according to claim 1, wherein: a bypass is arranged on the nitrogen inlet pipeline, and a flow-limiting pore plate is arranged on the bypass.

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