Decompressing fuel-oil floor washing device and method

[0032] Example 1

[0033] like figure 1 and image 3 As shown, the decompression type fuel oil floor washing device of the present invention includes an air pretreatment device, a nitrogen-enriched gas generator 8, a refueling truck oil tank 16 and a vacuum suction device 23, wherein:

[0034] The air pretreatment device includes an air filter 1, an air compressor 2, an aftercooler 3, an air exhaust shut-off valve 4, an air exhaust shut-off valve 4, an air storage bottle 5, and an air filter connected in series through an air delivery pipe in sequence. The flow regulating valve 6 and the filter 7, the air inlet of the air filter 1 communicates with the atmospheric environment, and the gas outlet of the filter 7 is connected with the air inlet 25 of the nitrogen-enriched gas generator 8 through a gas delivery pipe, by It can be seen that the device preprocesses the air in the atmospheric environment to obtain a quantitative amount of compressed air that has been purified, removed impurities and dehumidified, and provides a good pretreatment for the preparation of nitrogen-enriched gas to be carried out in the next step, effectively improving the nitrogen-enriched gas. Preparation efficiency and service life of nitrogen gas generator 8;

[0035] The nitrogen-enriched gas generator 8 includes a housing 28 with open ends and more than one tubular hollow fiber membrane 31, the tubular hollow fiber membrane 31 adopts polyethylene membrane, polypropylene membrane, polytetrafluoroethylene membrane or polyvinylidene fluoride film, the housing 28 is cylindrical, and the two open end flanges of the housing 28 are set, and the inner wall surface near the two open ends of the housing 28 The left tube sheet 27 and the right tube sheet 33 are respectively installed on the top, and the two ends of each tubular hollow fiber membrane 31 are installed on the left tube sheet 27 and the right tube sheet 33 respectively, and the two openings of the shell 28 The flange ends are connected to the left head 26 and the right head 30 respectively, and the left head 26 is provided with an air inlet 25, while the right head 30 is provided with a nitrogen-enriched gas outlet, and the housing 28 is provided with There is an oxygen-enriched outlet;

[0036] The nitrogen-enriched gas outlet 32 ​​of the nitrogen-enriched gas generator 8 is connected with the oil tank 16 of the fuel truck, and the exhaust hole of the oil tank 16 of the fuel tank is connected with a vacuum suction device 23 for controlling the gas pressure of the oil tank 16 of the fuel tank through a pipeline. connected, and the pipeline between the oil tank 16 exhaust hole of the refueling vehicle and the vacuum suction device 23 is provided with a cleaning tail gas stop valve 18, and the vacuum suction device 23 is a vacuum pump.

[0037] In addition, in order to improve the fuel washing efficiency and consolidate the effect of fuel inertization treatment, the present invention is provided with a fuel washing branch and a gas phase space flushing branch between the nitrogen-rich gas outlet 32 ​​of the nitrogen-rich gas generator 8 and the oil tank 16 of the refueling vehicle. and the nitrogen-enriched gas outlet 32 ​​of the nitrogen-enriched gas generator 8 is respectively connected to the fuel washing branch and the gas phase space flushing branch through a three-way pipe. The minimum fuel level of the vehicle oil tank 16, and the connection position between the gas phase space flushing branch and the fuel tank 16 is higher than the fuel level of the fuel tank 16, and the fuel washing branch is connected with a nitrogen-enriched gas flow regulating valve 12, and the flushing branch of the gas phase space is connected with a nitrogen-enriched gas bypass valve and a flushing stop valve 13 through a gas pipeline, and the nitrogen-enriched gas bypass valve is located between the nitrogen-enriched gas generator 8 and the flushing stop valve 13, and the rich The nitrogen gas bypass valve is connected to the flushing stop valve 13 and the nitrogen-enriched gas storage stop valve 10 respectively through a three-way pipe, and the gas outlet of the nitrogen-enriched gas storage stop valve 10 is connected to the nitrogen-enriched gas storage bottle 9, thus, The fuel oil floor washing device of the present invention can independently perform two fuel inertization treatment methods: one is the nitrogen-oxygen gas replacement fuel washing method through the fuel washing branch, and the other is the gas phase space flushing branch Therefore, the fuel oil in the fuel tank 16 of the refueling vehicle can be inertized through this device, which can be more efficient and better, and the nitrogen-enriched gas in the nitrogen-enriched gas storage bottle 9 can be input into the refueling tank. In the vehicle oil tank 16, the low oxygen content of the fuel can also be effectively maintained.

[0038] In order to increase the replacement speed of nitrogen-rich gas and oxygen in the fuel oil tank 16 of the refueling vehicle, the present invention is provided with a gas-oil mixing device on the fuel washing branch road, and the gas-oil mixing device is respectively provided with an air inlet, an oil inlet and a output hole, and the gas-oil mixing device is composed of more than one washing nozzle 14, and the output hole of each washing nozzle 14, that is, the installation position of the nozzle opening is lower than the minimum fuel level of the oil tank 16 of the refueling vehicle, so as to ensure that the refueling vehicle The fuel oil washing in the oil tank 16 is safe and reliable, the air inlet of the gas-oil mixing device is connected with the gas outlet of the nitrogen-enriched gas flow regulating valve 12 through the gas delivery pipe, and the oil inlet of the gas-oil mixing device is connected with the fuel circulation pump 15 and The fuel tank 16 of the refueling truck is connected, and the output hole is connected with the fuel tank 16 of the refueling truck, and the connection position between the output hole and the fuel tank 16 of the refueling truck is lower than the minimum fuel level of the fuel tank 16 of the refueling truck. The gas and the fuel delivered by the fuel circulation pump 15 are fully mixed in the washing nozzle 14, and the nitrogen-enriched gas is sheared into tiny particle bubbles, which flow out from the gas-liquid mixing outlet (that is, the output hole) of the washing nozzle 14 into the oil tank of the refueling vehicle In 16, the oxygen dissolved in the fuel undergoes mass transfer exchange with the nitrogen-enriched gas, more nitrogen dissolves into the fuel, displaces the dissolved oxygen, and enters the gas phase space, thereby realizing fuel washing.

[0039] In order to reduce the fuel loss caused by the fuel inertization treatment process, the exhaust hole of the oil tank 16 of the fuel tanker described in the present invention is respectively connected with the washing exhaust bypass valve and the exhaust fuel recovery branch through a three-way pipe. The road includes a gas-oil condensation separator and a fuel oil recovery pump 19, the gas separation port of the gas-oil condensation separator is connected with a vacuum suction device 23, and the fuel oil separation port of the gas-oil condensation separator is connected with the fuel recovery pump 19 , the output end of the fuel recovery pump 19 is connected to the oil tank 16 of the refueling vehicle, and a liquid trap 20 is connected to the oil delivery pipe between the gas-oil condensation separator and the fuel recovery pump 19, and the exhaust gas cut-off valve 18 is arranged on the gas On the gas pipeline between the oil condensation separator and the oil tank 16 of the refueling truck, the fuel oil carried out by the exhaust gas after washing can be effectively recovered and treated.

[0040] Through the above specific device structure description, it can be known that the decompression type fuel oil floor washing device of the present invention includes the following several working modes:

[0041] A. When the device works in the gas phase space flushing mode, the specific work flow is as follows: 1) Open the air exhaust stop valve 4, and turn on the air compressor 2, so that the air in the environment passes through the air filter 1 to remove dust particles , pressurized by the air compressor 2, after the ambient air in the aftercooler 3 is fully cooled, it is filled into the air storage bottle 5; 2) When the pressure in the air storage bottle 5 reaches the set value, open and adjust the air flow adjustment Valve 6 makes the air flow through the filter 7 to remove moisture and other impurities in the air, and utilizes the nitrogen-enriched gas generator 8 to produce nitrogen-enriched gas of suitable concentration; 3) close the nitrogen-enriched gas storage cut-off valve 10, Nitrogen gas flow regulating valve 12 and exhaust gas scrubbing shut-off valve 18, open nitrogen-enriched gas bypass valve 11, flushing shut-off valve 13 and exhaust exhaust bypass valve 17, so that all the nitrogen-enriched gas generated flows into fuel tank 16 of fuel tanker The gas phase space above the surface, the gas in the gas phase space is replaced, and the replaced gas is discharged into the atmosphere through the flushing exhaust bypass valve 17; , close the nitrogen-enriched gas bypass valve 11, the flushing stop valve 13 and the flushing tail gas bypass valve 17, and the gas phase space flushing mode ends;

[0042] B. When the device works in the fuel washing mode, the specific work flow is as follows: 1) Open the air exhaust stop valve 4, and turn on the air compressor 2, so that the air in the environment passes through the air filter 1 to remove dust particles, After being pressurized by the air compressor 2 and fully cooled by the ambient air in the aftercooler 3, the air storage bottle 5 is filled; 2) When the pressure in the air storage bottle 5 reaches the set value, open and adjust the air flow adjustment Valve 6, make air flow through filter 7, after removing moisture and other impurities in the air, produce the nitrogen-enriched gas of suitable concentration in nitrogen-enriched gas generator 8; 3) close the nitrogen-enriched gas storage stop valve 10, nitrogen-enriched The gas bypass valve 11, the flushing shut-off valve 13 and the flushing tail gas bypass valve 17 open and adjust the nitrogen-enriched gas flow regulating valve 12 and the fuel circulation pump 15, so that the nitrogen-enriched gas and the fuel delivered by the fuel circulation pump 15 flow through the washing nozzle 14 is fully mixed, and the nitrogen-enriched gas is cut into tiny particle bubbles, which flow out from the gas-liquid mixing outlet of the washing nozzle 14 into the oil tank 16 of the refueling truck, and the oxygen and nitrogen gas dissolved in the fuel and the nitrogen-enriched gas generate mass transfer Exchange, more nitrogen dissolves into the fuel oil, displaces the dissolved oxygen, and enters the gas phase space; 4) Open the scrubbing tail gas shut-off valve 18 and the vacuum suction device 23, so that the oxygen and nitrogen-enriched gas escaped from the fuel oil The undissolved nitrogen and fuel vapor in the gas phase are mixed in the gas phase space to form the exhaust gas to flow through the exhaust gas cooler 21, and the refrigerant produced by the refrigeration unit 22 is cooled by the cooling pipe placed in the shell 28 of the exhaust gas cooler 21. Part of the fuel vapor is condensed into a liquid state and flows into the liquid trap 20; 5) when the liquid fuel level in the liquid trap 20 reaches the set height, the fuel recovery pump 19 is turned on to pressurize part of the fuel in the liquid trap 20 Send back to the oil tank 16 of the refueling truck until the fuel liquid level in the liquid trap 20 reaches below the set height; 6) the remaining washing tail gas is discharged into the atmosphere through the exhaust port of the vacuum suction device 23; 7) when After the dissolved oxygen concentration of the fuel in the fuel tank 16 of the refueling truck reaches the set value, the nitrogen-enriched gas flow regulating valve 12, the fuel circulation pump 15, the exhaust gas washing stop valve 18 and the vacuum suction device 23 are closed, and the fuel washing mode ends.

[0043] C. When the device works in the nitrogen-enriched gas storage mode, the specific workflow is as follows: 1) Open the air exhaust stop valve 4 and turn on the air compressor 2, so that the air in the environment passes through the air filter 1 to remove dust particles, After being pressurized by the air compressor 2 and fully cooled by the ambient air in the aftercooler 3, the air storage bottle 5 is filled; 2) When the pressure in the air storage bottle 5 reaches the set value, open and adjust the air flow adjustment Valve 6, after the air flows through the filter 7 to remove moisture and other impurities in the air, a small flow of high-purity nitrogen-enriched gas is generated in the nitrogen-enriched gas generator 8; 3) open the nitrogen-enriched gas storage stop valve 10 and the nitrogen-enriched The gas bypass valve 11 closes the nitrogen-enriched gas flow regulating valve 12 and the flushing shut-off valve 13, so that the high-purity nitrogen-enriched gas all flows into the nitrogen-enriched gas storage bottle 9; 4) when the pressure in the nitrogen-enriched gas storage bottle 9 reaches the set value , close the nitrogen-enriched gas storage cut-off valve 10 and the nitrogen-enriched gas bypass valve 11, and the nitrogen-enriched gas storage mode ends.

[0044] D. When the device works in the nitrogen-enriched pressure maintenance mode, the specific work flow is as follows: 1) When the fuel washing mode stops, open the nitrogen-enriched gas storage cut-off valve 10 and the flushing stop valve 13 to store the nitrogen-enriched gas in the storage bottle 9 The high-purity nitrogen-enriched gas flows into the gas phase space at the top of the oil tank 16 of the refueling truck; 2) when the gas phase space at the top of the oil tank 16 of the fuel truck reaches the set pressure, close the nitrogen-enriched gas storage cut-off valve 10 and the flushing cut-off valve 13, the rich The nitrogen-enriched gas pressurization maintenance mode (nitrogen-enriched gas gas-phase space flushing mode) in the nitrogen storage bottle 9 is completed, and this step can effectively maintain the low oxygen content of the fuel in the oil tank 16 of the refueling truck; In the pressure maintenance mode, the nitrogen-enriched gas can also be directly introduced from the nitrogen-enriched gas outlet of the nitrogen-enriched gas generator 8 into the gas phase space of the fuel tank 16 through the gas pipeline, but the nitrogen content of the gas introduced through the nitrogen-enriched gas storage bottle 9 The higher the value, the better the control effect on the low oxygen content of the fuel.

[0045] Example 2

[0046] like figure 2 , Figure 4 and Figure 5 As shown, this embodiment is basically the same as Embodiment 1, but the difference between this embodiment and Embodiment 1 is that the gas outlet of the nitrogen-enriched gas flow regulating valve 12 is connected to the nitrogen-enriched gas distributor 24 through a gas delivery pipe, and the nitrogen-enriched gas distribution The device 24 is placed under the lowest fuel level in the oil tank 16 of the refueling vehicle, and the nitrogen-rich distributor 24 includes a bracket 37 and a main pipeline installed on the bracket 37, and the nitrogen-rich distributor 24 is connected to the fuel truck through the bracket 37. The inner wall of the oil tank 16 is fixed, the main pipeline is provided with a gas inlet pipe 38, and the body of the main pipeline is connected with more than one branch pipeline, and each branch pipeline is provided with a number of small gas outlet holes 36 .

[0047] Therefore, in the present embodiment, the nitrogen-enriched gas is no longer sent into the oil tank 16 of the refueling vehicle by the washing nozzle 14, but is completed by the nitrogen-enriched gas distributor 24, so the sports equipment fuel circulation pump 15 is reduced in the present embodiment, and from Figure 4 and Figure 5 It can be seen that compared with the gas-liquid mixing outlet on the washing nozzle 14, the numerous gas outlet holes 36 of the nitrogen-enriched gas distributor 24 are conducive to the more uniform discharge of the nitrogen-enriched gas from the bottom of the oil tank 16 of the refueling vehicle, improving the mass transfer effect and reducing fuel consumption. The washing effect is beneficial.

[0048] Compared with Example 1, the same steps of the fuel washing mode of the present embodiment and Example 1 are steps 1), 2), 4), 5) and 6), and the different steps are in the 3) and 7) steps, Specifically: 3) close the nitrogen-enriched gas storage stop valve 10, the nitrogen-enriched gas bypass valve 11, the flushing stop valve 13 and the flushing tail gas bypass valve 17, open and adjust the nitrogen-enriched gas flow regulating valve 12, so that the nitrogen-enriched gas flows from The gas inlet pipe 38 flows into the nitrogen-enriched gas distributor 24, and flows through the main pipeline 34 and multiple branch pipelines 35 in sequence, and finally flows out from the multiple gas outlet holes 36 on the nitrogen-enriched gas distributor 24 and forms tiny bubbles to enter the fuel. The oxygen and nitrogen gas dissolved in the fuel produces mass transfer exchange with the nitrogen-enriched gas, and more nitrogen dissolves in the fuel, replaces the dissolved oxygen, and enters the gas phase space; 7) when the dissolved oxygen in the fuel tank 16 of the refueling vehicle After the concentration reaches the set value, the nitrogen-enriched gas flow regulating valve 12, the exhaust gas washing stop valve 18 and the vacuum suction device 23 are closed, and the fuel oil washing mode stops.

[0049] In summary, the decompression-type fuel oil ground washing method described in the present invention includes: using a certain pressure of nitrogen-enriched gas to inertize the fuel in the oil tank 16 of the refueling vehicle, and the nitrogen-enriched gas is generated by the nitrogen-enriched gas The hollow fiber membrane 31 set in the device 8 is prepared by using compressed air. The nitrogen-rich gas output from the nitrogen-rich gas generator 8 is used to inertize the fuel in the oil tank 16 of the fuel tanker through two methods: fuel washing and gas phase space flushing. and inertization treatment of the fuel washing method, the pressure in the fuel tank 16 of the refueling truck is lower than the external atmospheric pressure, and the ratio of the internal pressure of the fuel tank 16 of the refueling truck to the external atmospheric pressure ranges from 0.1 to 0.5. The oxygen content in the fuel after vacuum fuel washing is lower than that of normal pressure washing, which can ensure that there is no or only a small amount of dissolved oxygen escaping when the aircraft is at cruising altitude, which improves the safety of the fuel tank. After the fuel in the tank 16 is inertized, nitrogen-rich gas is input into the gas phase space of the fuel tank 16 of the refueling truck to pressurize and maintain the low oxygen content of the fuel in the fuel tank 16 of the refueling truck, further improving the safety of the aircraft fuel tank .